OVERVIEW


We invest in scientific innovation to create transformative medicines for people
with serious diseases with a focus on specialty markets. We continue to focus on
developing and commercializing therapies for the treatment of cystic fibrosis,
or CF, and in 2019 we obtained approval in the United States, or U.S., for
TRIKAFTA (elexacaftor/tezacaftor/ivacaftor and ivacaftor). We are broadening our
pipeline through internal research efforts and accessing external innovation
through business development transactions.
We have four approved medicines that treat the underlying cause of CF, which is
a life-threatening genetic disease. In October 2019, TRIKAFTA , our
triple-combination regimen, was approved by the United States Food and Drug
Administration, or FDA, for the treatment of patients with CF 12 years of age or
older who have at least one F508del mutation in the cystic fibrosis
transmembrane conductance regulator, or CFTR, gene. This approval increased the
number of patients eligible for our medicines in the U.S. by approximately 6,000
and provided an additional treatment option for many patients who are also
eligible for one of our previously approved products. We have submitted a
Marketing Authorization Application, or MAA, to the European Medicines Agency,
or EMA, for this triple combination regimen. Our four medicines are collectively
approved to treat approximately 60% of the 75,000 CF patients in North America,
Europe and Australia. We are focused on obtaining approval for the triple
combination in ex-U.S. markets for patients 12 years of age and older and
evaluating our triple combination in younger patients, with the goal of having
treatments for up to 90% of patients with CF. We are also pursuing other
therapeutic approaches to address the remaining 10% of CF patients.
Our small molecule programs include programs focused on developing treatments
for alpha-1 antitrypsin, or AAT, deficiency, APOL1-mediated kidney diseases and
pain. We are evaluating CTX001, a genetic therapy as a potential treatment for
sickle cell disease and beta-thalassemia, in a Phase 1/2 clinical trial in
collaboration with CRISPR Therapeutics AG, or CRISPR. In 2019, through a series
of strategic transactions, we established preclinical genetic therapy programs
for Duchenne muscular dystrophy, or DMD, and myotonic dystrophy type 1, or DM1,
and a preclinical program to develop cell-based therapies for type 1 diabetes,
or T1D.
Financial Highlights
Over the last three years, our product revenues have increased significantly and
we have limited the growth of our expenses, which has allowed us to create
significant operating margins and reinvest in our business.
Revenues
Over the last three years, our net product revenues have increased as we
obtained approvals for TRIKAFTA and SYMDEKO/SYMKEVI and expanded access to our
medicines.

              [[Image Removed: chart-642b38eab6d652b2af8a01.jpg]]

Expenses
Our combined R&D and SG&A expenses increased from $1.97 billion in 2018 to $2.41
billion in 2019 primarily due to research expenses associated with our business
development activities. In 2019, cost of sales was approximately 13.2% of our
net product revenues.
Balance Sheet[[Image Removed: chart-4a9cf4c4b68f5058a30.jpg]]


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Business Highlights
Cystic Fibrosis
•    Obtained approval in October 2019 from the FDA for TRIKAFTA for treatment of

patients with CF 12 years of age and older who have at least one F508del

mutation.

• TRIKAFTA was approved approximately three months after we submitted the NDA

for the triple combination regimen and within four years of discovery of the

final component of the triple combination regimen.

• Submitted a MAA to the European Medicines Agency, or EMA, for the triple

combination of elexacaftor, tezacaftor and ivacaftor in patients 12 years of


     age and older.



•    Conducting a Phase 3 clinical trial evaluating

elexacaftor/tezacaftor/ivacaftor and ivacaftor in children 6 to 11 years of

age who have two F508del mutations or one F508del mutation and one minimal

function mutation.

• Obtained a positive opinion from the EMA's Committee for Medicinal Products

for Human Use for KALYDECO for infants as young as six months old.

• Obtained reimbursement of ORKAMBI and/or SYMDEKO/SYMKEVI for eligible

patients in several important ex-U.S. markets, including England, France,

Australia, Scotland and Spain.

Pipeline

• AAT Deficiency: We initiated a Phase 2 proof-of-concept clinical trial for

VX-814, our first investigational oral small molecule corrector for the

treatment of alpha-1 antitrypsin, or AAT, deficiency, in order to evaluate

VX-814 in patients with AAT deficiency who have two copies of the Z

mutation. A Phase 1 clinical trial of VX-864, a second investigational small


     molecule corrector for the treatment of AAT deficiency, is ongoing in
     healthy volunteers.

• APOL1-mediated Kidney Disease: In the fourth quarter of 2019, we completed a

Phase 1 clinical trial evaluating VX-147, our first investigational oral

small molecule for the treatment of APOL1-mediated focal segmental

glomerulosclerosis, or FSGS, and other serious kidney diseases, in healthy

volunteers. We plan to initiate a Phase 2 proof-of-concept clinical trial in


     2020 to evaluate the reduction in protein levels with VX-147 in FSGS
     patients.

• Sickle Cell Disease and Beta-Thalassemia: Enrollment is ongoing in Phase 1/2

clinical trials evaluating CTX001 for the treatment of severe





sickle cell disease and beta-thalassemia. Along with our collaborator, CRISPR,
we announced positive, interim data from the first two patients with these
hemoglobinopathies treated with the investigational CRISPR/Cas9 gene-editing
therapy CTX001 in the ongoing Phase 1/2 trials. We expect to provide additional
data for this program in 2020.
•    Pain: We plan to initiate clinical development of a novel NaV1.8 inhibitor

for the treatment of pain in the first half of 2020.

• Type 1 diabetes: Acquired cell-based therapy programs that we are advancing

as potential treatments for T1D by acquiring Semma Therapeutics. We plan to

advance this program into clinical development in T1D patients in late 2020

or early 2021.

• DMD and DM1: Acquired Exonics and expanded our collaboration with CRISPR in

July 2019, in order to support a pre-clinical program to develop treatments


     for DMD and DM1.



Research


We are continuing to invest in our research programs and fostering scientific
innovation in order to identify and develop transformative medicines. Our
strategy is to combine transformative advances in the understanding of human
disease and the science of therapeutics in order to identify and develop new
medicines. We believe that pursuing research in diverse areas allows us to
balance the risks inherent in drug development and may provide drug candidates
that will form our pipeline in future years. To supplement our internal research
programs, we acquire technologies and programs and collaborate with
biopharmaceutical and technology companies, leading academic research
institutions, government laboratories, foundations


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and other organizations as needed to advance research in our areas of
therapeutic interest and to access technologies needed to execute on our
strategy.
Drug Discovery and Development
Discovery and development of a new pharmaceutical product is a difficult and
lengthy process that requires significant financial resources along with
extensive technical and regulatory expertise. Potential drug candidates are
subjected to rigorous evaluations, driven in part by stringent regulatory
considerations, designed to generate information concerning efficacy,
side-effects, proper dosage levels and a variety of other physical and chemical
characteristics that are important in determining whether a drug candidate
should be approved for marketing as a pharmaceutical product. Most chemical
compounds that are investigated as potential drug candidates never progress into
development, and most drug candidates that do advance into development never
receive marketing approval. Because our investments in drug candidates are
subject to considerable risks, we closely monitor the results of our discovery,
research, clinical trials and nonclinical studies and frequently evaluate our
drug development programs in light of new data and scientific, business and
commercial insights, with the objective of balancing risk and potential. This
process can result in abrupt changes in focus and priorities as new information
becomes available and as we gain additional understanding of our ongoing
programs and potential new programs, as well as those of our competitors.
If we believe that data from a completed registration program support approval
of a drug candidate, we submit an NDA to the FDA requesting approval to market
the drug candidate in the United States and seek analogous approvals from
comparable regulatory authorities in jurisdictions outside the United States. To
obtain approval, we must, among other things, demonstrate with evidence gathered
in nonclinical studies and well-controlled clinical trials that the drug
candidate is safe and effective for the disease it is intended to treat and that
the manufacturing facilities, processes and controls for the manufacture of the
drug candidate are adequate. The FDA and ex-U.S. regulatory authorities have
substantial discretion in deciding whether or not a drug candidate should be
granted approval based on the benefits and risks of the drug candidate in the
treatment of a particular disease, and could delay, limit or deny regulatory
approval. If regulatory delays are significant or regulatory approval is limited
or denied altogether, our financial results and the commercial prospects for the
drug candidate involved will be harmed.
Regulatory Compliance
Our marketing of pharmaceutical products is subject to extensive and complex
laws and regulations. We have a corporate compliance program designed to
actively identify, prevent and mitigate risk through the implementation of
compliance policies and systems and through the promotion of a culture of
compliance. Among other laws, regulations and standards, we are subject to
various U.S. federal and state laws, and comparable laws in other jurisdictions,
pertaining to health care fraud and abuse, including anti-kickback and false
claims laws, and laws prohibiting the promotion of drugs for unapproved or
off-label uses. Anti-kickback laws generally make it illegal for a prescription
drug manufacturer to knowingly and willfully solicit, offer, receive or pay any
remuneration in return for or to induce the referral of business, including the
purchase or prescription of a particular drug that is reimbursed by a state or
federal health care program. False claims laws prohibit anyone from knowingly or
willfully presenting for payment to third-party payors, including Medicare and
Medicaid, claims for reimbursed drugs or services that are false or fraudulent,
claims for items or services not provided as claimed, or claims for medically
unnecessary items or services. We are subject to laws and regulations that
regulate the sales and marketing practices of pharmaceutical manufacturers, as
well as laws such as the U.S. Foreign Corrupt Practices Act, which govern our
international business practices with respect to payments to government
officials. In addition, we are subject to various data protection and privacy
laws and regulations in the U.S., E.U., Canada, Australia and other
jurisdictions. We expect to continue to devote substantial resources to
maintain, administer and expand these compliance programs globally.
Reimbursement
Sales of our products depend, to a large degree, on the extent to which our
products are reimbursed by third-party payors, such as government health
programs, commercial insurance and managed health care organizations. We
dedicate substantial management and other resources in order to obtain and
maintain appropriate levels of reimbursement for our products from third-party
payors, including governmental organizations in the United States and ex-U.S.
markets.
In the United States, we have worked successfully with third party-payors in
order to promptly obtain appropriate levels of reimbursement for our first three
CF medicines and have begun working with these stakeholders to obtain
reimbursement for TRIKAFTA. We plan to continue to engage in discussions with
numerous commercial insurers and managed health care organizations, along with
government health programs that are typically managed by authorities in the
individual states, to ensure that payors recognize the significant benefits that
our medicines provide by treating the underlying cause of cystic fibrosis and
continue to provide access to our medicines.


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In Europe and other ex-U.S. markets, we seek government reimbursement for our
medicines on a country-by-country basis. This is necessary for each new
medicine, as well as, in most countries, label expansions for our current
medicines. We successfully obtained reimbursement for KALYDECO in each
significant ex-U.S. market within two years of approval. We experienced
significant challenges in obtaining reimbursement for ORKAMBI in certain ex-U.S.
markets. In the fourth quarter of 2019, we obtained reimbursement for ORKAMBI
and SYMKEVI in the United Kingdom and ORKAMBI in France, four years after
ORKAMBI's initial approval in 2015. With this approval, we now have obtained
reimbursement for ORKAMBI or SYMKEVI in most of our significant ex-U.S. markets.
In some ex-U.S. markets, including Ireland, Denmark and Australia, our
reimbursement agreements include innovative arrangements that provide a pathway
to access and rapid reimbursement for certain future CF medicines. We recently
filed a MAA with the EMA for the triple combination regimen of elexacaftor,
tezacaftor and ivacaftor and, if approved, we would need to seek government
reimbursement on a country-by-country basis, in most European markets. In
December 2019, we reached an agreement with the government in Ireland to expand
the existing reimbursement agreement to include the triple combination regimen
pending approval by the EMA.
Strategic Transactions
Acquisitions
As part of our business strategy, we seek to acquire drugs, drug candidates and
other technologies and businesses that have the potential to complement our
ongoing research and development efforts. In 2019, we invested significantly in
business development transactions designed to augment our pipeline. We expect to
continue to identify and evaluate potential acquisitions that may be similar to
or different from the transactions that we have engaged in previously.
In July 2019, we acquired Exonics, a privately-held company focused on creating
transformative gene-editing therapies to repair mutations that cause DMD and
other severe neuromuscular diseases, including DM1. Our acquisition of Exonics
enhanced our gene-editing capabilities and supports the potential development of
novel therapies for DMD and DM1. In connection with the acquisition, we acquired
all of the outstanding equity of Exonics for an upfront payment of approximately
$245.0 million plus customary working capital adjustments in cash, and certain
potential future payments based primarily upon the successful achievement of
specified development and regulatory milestones for the DMD and DM1 programs.
In October 2019, we acquired Semma, a privately-held company focused on the use
of stem cell-derived human islets as a potentially curative treatment for type 1
diabetes. Our acquisition of Semma advanced our cell therapy capabilities and
supports the potential development of transformative therapies for T1D. In
connection with the acquisition, we acquired all of the outstanding equity of
Semma for approximately $950.0 million in cash.
Both of these acquisitions were accounted for as business combinations. As of
the acquisition date for each transaction, the cash payments, as well as the
fair value of contingent consideration for Exonics, were allocated primarily to
goodwill and the fair value of several in-process research and development
assets that we acquired.  The fair value of contingent consideration related to
Exonics was recorded as a liability and will be adjusted on a quarterly basis in
the future. As a result, these acquisitions are primarily reflected in
additional assets and liabilities on our consolidated balance sheet.  Operating
expenses incurred by Exonics and Semma after the acquisition dates and specific
expenses associated with the acquisitions are reflected in our consolidated
statement of operations for 2019.
Please refer to Note C, "Acquisitions," and our critical accounting policies,
"Acquisitions," for further information regarding the significant judgments and
estimates related to our acquisitions.
Collaboration and Licensing Arrangements
We enter into arrangements with third parties, including collaboration and
licensing arrangements, for the development, manufacture and commercialization
of drugs, drug candidates and other technologies that have the potential to
complement our ongoing research and development efforts. We expect to continue
to identify and evaluate collaboration and licensing opportunities that may be
similar to or different from the collaborations and licenses that we have
engaged in previously.
In-License Agreements
We have entered into collaborations with biotechnology and pharmaceutical
companies in order to acquire rights or to license drug candidates or
technologies that enhance our pipeline and/or our research capabilities. Over
the last several years, we entered into collaboration agreements with:
•      Arbor Biotechnologies, Inc., or Arbor, pursuant to which we are

collaborating on the discovery of novel proteins, including DNA

endonucleases, to advance the development of new gene-editing therapies.






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•      CRISPR, pursuant to which we have been collaborating since 2015 on the
       discovery and development of potential new treatments aimed at the

underlying genetic causes of human diseases using CRISPR-Cas9 gene-editing


       technology. In 2019, we obtained the exclusive worldwide rights to
       CRISPR's intellectual property for DMD and DM1 gene-editing products
       through a new agreement with CRISPR.


•      Kymera Therapeutics, or Kymera, pursuant to which we are looking to
       advance small molecule protein degraders against multiple targets.

• Molecular Templates, Inc., pursuant to which we are collaborating on the

discovery and development of novel targeted conditioning regimens to

enhance the hematopoietic stem cell transplant process.




Generally, when we in-license a technology or drug candidate, we make upfront
payments to the collaborator, assume the costs of the program and/or agree to
make contingent payments, which could consist of milestone, royalty and option
payments. Most of these collaboration payments are expensed as research and
development expenses; however, depending on many factors, including the
structure of the collaboration, the significance of the drug candidate that we
license to the collaborator's operations and the other activities in which our
collaborators are engaged, the accounting for these transactions can vary
significantly. Our research and development expenses included $318.3 million in
2019, $111.9 million in 2018 and $168.7 million in 2017 related to upfront and
milestone payments pursuant to our collaboration agreements.
Upfront payments and expenses incurred in connection with the collaborations
listed above are being expensed as research or development expenses because the
collaboration represents a small portion of each of these collaborator's overall
business. In contrast, Parion Sciences, Inc., or Parion, and BioAxone
Biosciences, Inc., or BioAxone, with whom we previously collaborated, were
historically accounted for as variable interest entities, or VIEs, and included
in our consolidated financial statements. In 2017 and 2018, we determined that
the requirements for consolidation were no longer met with respect to Parion and
BioAxone, respectively. As a result, we deconsolidated Parion and BioAxone from
our consolidated financial statements as of September 30, 2017 and December 31,
2018, respectively, and did not consolidate any VIEs in 2019.
A collaborator that we account for as a VIE may engage in activities unrelated
to our collaboration. The revenues and expenses unrelated to the programs we
in-license from our VIEs have historically been immaterial to our consolidated
financial statements. With respect to each of Parion and BioAxone, the
activities unrelated to our collaborations with these entities represented
approximately 2% or less of our total revenues and total expenses on an annual
basis during the periods that we consolidated these collaborators.
Out-License Agreements
We also have out-licensed internally-developed programs to collaborators who are
leading the development of these programs. These out-license arrangements
include our agreements with:
•      Janssen Pharmaceuticals, Inc., or Janssen, which is evaluating pimodivir
       in Phase 3 clinical trials for the treatment of influenza; and


•      Merck KGaA, Darmstadt, Germany, which licensed oncology research and
       development programs from us in early 2017.


Pursuant to these out-licensing arrangements, our collaborators are responsible
for the research, development and commercialization costs associated with these
programs, and we are entitled to receive contingent milestone and/or royalty
payments. As a result, we do not expect to incur significant expenses in
connection with these programs and have the potential for future collaborative
and royalty revenues resulting from these programs.
Please refer to Note B, "Collaborative Arrangements," for further information
regarding our VIEs, in-license agreements and out-license agreements.
Strategic Investments
In connection with our business development activities, we have periodically
made equity investments in our collaborators. As of December 31, 2019, we held
strategic equity investments in several public companies, including CRISPR, and
certain private companies, and we plan to make additional strategic equity
investments in the future. While we invest the majority of our cash, cash
equivalents and marketable securities in instruments that meet specific credit
quality standards and limit our exposure to any one issue or type of instrument,
our strategic investments are maintained and managed separately from our other
cash, cash equivalents and marketable securities.


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Until December 31, 2017, changes in the fair value of these strategic
investments were reflected on our consolidated balance sheet, but did not affect
our net income until the related gains or losses were realized. As a result of
accounting guidance, effective January 1, 2018, changes in the fair value of
equity investments with readily determinable fair values (including publicly
traded securities such as CRISPR) were recorded to other income (expense), net
in our consolidated statement of operations in 2019 and 2018. For equity
investments without readily determinable fair values including equity
investments in private companies, each reporting period we are required to
re-evaluate the carrying value of the investment, which may result in other
income (expense).
In 2019 and 2018, we recorded within other income (expense), net gains of $197.6
million and $2.6 million related to changes in the fair value of our strategic
investments and from sales of certain investments. To the extent that we
continue to hold strategic investments, particularly strategic investments in
publicly traded companies, we will record other income (expense) related to
these strategic investments on a quarterly basis. Due to the high volatility of
stocks in the biotechnology industry, we expect the value of these strategic
investments to fluctuate and that the increases or decreases in the fair value
of these strategic investments will continue to have material impacts on our net
income (expense) and our profitability on a quarterly and/or annual basis.


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RESULTS OF OPERATIONS
                                                                                    2019/2018                     2018/2017
                                                                                   Comparison                    Comparison
                                                                               Increase/(Decrease)           Increase/(Decrease)
                               2019            2018            2017                $              %              $              %
                                          (in thousands)                              (in thousands, except percentages)

Revenues                   $ 4,162,821     $ 3,047,597     $ 2,488,652     $     1,115,224        37 %   $       558,945        22 %
Operating costs and
expenses                     2,965,255       2,412,447       2,365,409             552,808        23 %            47,038         2 %

Income from operations 1,197,566 635,150 123,243


       562,416        89 %           511,907       415 %
Other non-operating income
(expense), net                 197,353         (25,116 )        32,917                  **        **                  **        **
Provision for income taxes     218,109      (1,486,862 )      (107,324 )                **        **                  **        **
Net income attributable to
Vertex                     $ 1,176,810     $ 2,096,896     $   263,484

$ (920,086 ) ** $ 1,833,412 **



Net income per diluted
share attributable to
Vertex common shareholders $      4.51     $      8.09     $      1.04
Diluted shares used in per
share calculations             260,673         259,185         253,225
                                                                                               ** Not meaningful


Net Income and Income from Operations
Our income from operations increased to $1.20 billion in 2019 compared to $635.2
million in 2018 and $123.2 million in 2017, primarily as a result of the
approval of SYMDEKO/SYMKEVI in 2018 and TRIKAFTA in 2019, and continued strong
net product revenues from KALYDECO and ORKAMBI. The increased net product
revenues were partially offset by increased operating costs and expenses
primarily attributable to increased cost of sales due to increased net product
revenues and increased research expenses associated with our business
development activities.
Net income attributable to Vertex in 2018 included a one-time non-cash benefit
from income taxes of $1.56 billion resulting from our release of our valuation
allowance. As a result of this one-time cash benefit in 2018, net income
attributable to Vertex was higher in 2018 than 2019 and 2017.
Earnings Per Share
In 2019, 2018 and 2017, net income attributable to Vertex was $4.51, $8.09,
$1.04, respectively, per diluted share. The higher diluted earnings per share in
2018 as compared to 2019 and 2017 was due primarily to the benefit from income
taxes as a result of the release of our valuation allowance, which increased net
income attributable to Vertex by $6.03 per diluted share in 2018.
Revenues
                                                                                   2019/2018                    2018/2017
                                                                                  Comparison                    Comparison
                                                                              Increase/(Decrease)          Increase/(Decrease)
                              2019            2018            2017               $              %              $             %
                                         (in thousands)                              (in thousands, except percentages)
Product revenues, net     $ 4,160,726     $ 3,038,325     $ 2,165,480     $    1,122,401        37  %   $    872,845         40  %
Collaborative and royalty
revenues                        2,095           9,272         323,172             (7,177 )     (77 )%       (313,900 )      (97 )%
Total revenues            $ 4,162,821     $ 3,047,597     $ 2,488,652     $    1,115,224        37  %   $    558,945         22  %




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Product Revenues, Net
                          2019           2018           2017
                                    (in thousands)
TRIKAFTA              $   420,105    $         -    $         -
SYMDEKO/SYMKEVI         1,417,668        768,657              -
ORKAMBI                 1,331,891      1,262,166      1,320,850
KALYDECO                  991,062      1,007,502        844,630

Product revenues, net $ 4,160,726 $ 3,038,325 $ 2,165,480




In 2019, our net product revenues increased by $1.12 billion as compared to
2018. In 2018, our net product revenues increased by $872.8 million as compared
to 2017. The increase in total net product revenues in 2019 was primarily due to
the increasing number of patients being treated with SYMDEKO/SYMKEVI, the
October 2019 approval of TRIKAFTA in the United States, label expansions for
KALYDECO and ORKAMBI and expanded access to our medicines in ex-U.S. markets. In
2019, 2018 and 2017, our net product revenues included product revenues of $1.1
billion, $682.4 million, and 501.8 million, respectively, from ex-U.S. markets.
We expect that our net product revenues will increase in 2020 due to increasing
numbers of patients being treated with our medicines as a result of the approval
of TRIKAFTA, label expansions for our previously approved products and expanded
access to our medicines. TRIKAFTA increases the number of patients eligible for
our medicines by providing the first treatment option for a significant number
of patients with CF, and provides a new treatment option for many patients who
are eligible for one of our previously approved medicines. As a result, the
approval of TRIKAFTA in the United States is resulting in increased net product
revenues as well as a shift of net product revenues from our previously approved
products to TRIKAFTA.
TRIKAFTA
TRIKAFTA was approved by the FDA in October 2019. TRIKAFTA net product revenues
were $420.1 million in 2019, all of which were recognized in the fourth quarter
of 2019. We recently submitted a MAA to the EMA for the triple combination
regimen of elexacaftor, tezacaftor and ivacaftor. We expect TRIKAFTA net product
revenues will increase significantly in 2020 as compared to 2019.
SYMDEKO/SYMKEVI
SYMDEKO/SYMKEVI net product revenues were $1.42 billion in 2019 as compared to
$768.7 million in 2018. SYMDEKO was approved by the FDA in February 2018 and
SYMKEVI was approved in the European Union in November 2018. In the fourth
quarter of 2019, some patients in the United States began switching from SYMDEKO
to TRIKAFTA.
ORKAMBI
ORKAMBI net product revenues were $1.33 billion in 2019, $1.26 billion in 2018
and $1.32 billion in 2017. We have continued to increase the number of patients
eligible for ORKAMBI through label expansions and additional ex-U.S.
reimbursement arrangements. These increases in eligible patients have been
offset by a portion of the patients who were being treated with ORKAMBI
switching to SYMDEKO/SYMKEVI or TRIKAFTA.
From 2015 into the fourth quarter of 2019, we distributed ORKAMBI through early
access programs in France. Upon adopting ASC 606, Revenue from Contracts with
Customers, in the first quarter of 2018, we began recognizing a portion of the
amounts collected related to shipments of ORKAMBI through early access programs
as net product revenues, based on an estimated transaction price that reflected
the consideration we expected to retain that would not be subject to a
significant reversal in amounts recognized. Prior to adopting ASC 606, we had
not recognized any net product revenues from sales of ORKAMBI in France because
the price was not fixed or determinable at the time of delivery. Upon reaching
an agreement with the French government for ORKAMBI in the fourth quarter of
2019, including the final amount for ORKAMBI distributed through early access
programs, we recognized an adjustment to increase net product revenues related
to prior period shipments of ORKAMBI distributed through early access programs
of $155.8 million. Please refer to "Critical Accounting Policies - Revenue
Recognition" below for a discussion of our accounting treatment for our early
access program for ORKAMBI in France.


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KALYDECO


KALYDECO net product revenues were $991.1 million in 2019, $1.01 billion in 2018
and $844.6 million in 2017. KALYDECO net product revenues in 2019 were similar
to KALYDECO net product revenues in 2018. The increases in 2018 as compared to
2017 were primarily due to additional patients being treated with KALYDECO as we
completed reimbursement discussions in various ex-U.S. jurisdictions and as we
increased the number of patients eligible to receive KALYDECO through label
expansions.
Collaborative and Royalty Revenues
Our collaborative and royalty revenues were $2.1 million, $9.3 million and
$323.2 million in 2019, 2018 and 2017, respectively. In 2017, our collaborative
and royalty revenues included (i) $230.0 million in revenues related to a
one-time upfront payment earned in 2017 from Merck KGaA, Darmstadt, Germany,
(ii) a $25.0 million milestone related to our license agreement with Janssen for
the treatment of influenza and (iii) $40.0 million in revenues related to
upfront and milestone payments earned by one of our VIEs pursuant to a license
agreement entered into with a third party. We were not a party to the license
agreement between the VIE and the third party, and we had no economic interest
in either the license or these milestone payments. In 2017 through 2019, our
collaborative and royalty revenues also include a small amount of revenues
related to a cash payment we received in 2008 when we sold our rights to certain
HIV royalties and reimbursements for research and development activities related
to our collaborative arrangements.
Our collaborative revenues have historically fluctuated significantly from one
period to another and may continue to fluctuate in the future. Our future
royalty revenues will be dependent on if, and when, our collaborators, including
Janssen and Merck KGaA, Darmstadt, Germany are able to successfully develop drug
candidates that we have out-licensed to them.
Operating Costs and Expenses
                                                                                    2019/2018                     2018/2017
                                                                                   Comparison                    Comparison
                                                                               Increase/(Decrease)           Increase/(Decrease)
                               2019            2018            2017                $              %              $              %
                                          (in thousands)                              (in thousands, except percentages)
Cost of sales              $   547,758     $   409,539     $   275,119

$ 138,219 34 % $ 134,420 49 % Research and development expenses

                     1,754,540       1,416,476       1,324,625            338,064         24 %           91,851          7 %
Sales, general and
administrative expenses        658,498         557,616         496,079            100,882         18 %           61,537         12 %
Change in fair value of
contingent consideration         4,459               -               -              4,459         **                  -         **
Restructuring (income)
expenses                             -            (184 )        14,246                184         **            (14,430 )       **
Intangible asset
impairment charges                   -          29,000         255,340            (29,000 )       **           (226,340 )       **
Total costs and expenses   $ 2,965,255     $ 2,412,447     $ 2,365,409     $      552,808         23 %   $       47,038          2 %

                                                                                               ** Not meaningful


Cost of Sales
Our cost of sales primarily consists of the cost of producing inventories that
corresponded to product revenues for the reporting period, plus the third-party
royalties payable on our net sales of our products. Pursuant to our agreement
with the CFF, our tiered third-party royalties on sales of TRIKAFTA,
SYMDEKO/SYMKEVI, KALYDECO and ORKAMBI, calculated as a percentage of net sales,
range from the single digits to the sub-teens. As a result of the tiered royalty
rate, which resets annually, our cost of sales as a percentage of net product
revenues are lower at the beginning of each calendar year.
Over the last several years, our cost of sales has been increasing primarily due
to increased net product revenues. Our costs of sales as a percentage of net
product revenues has been approximately 13% for each of 2019, 2018 and 2017. In
2020, we expect our total cost of sales will increase due to expected increases
in our net product revenues and our cost of sales as a percentage of total net
product revenues will be similar to our cost of sales as a percentage of total
net product revenues in 2019.


                                       54

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Research and Development Expenses


                                                                                       2019/2018                        2018/2017
                                                                                      Comparison                       Comparison
                                                                                  Increase/(Decrease)              Increase/(Decrease)
                               2019            2018            2017                   $                 %             $              %
                                          (in thousands)                                 (in thousands, except percentages)

Research expenses          $   732,772     $   438,360     $   311,206     $       294,412              67 %   $     127,154         41  %
Development expenses         1,021,768         978,116       1,013,419              43,652               4 %         (35,303 )       (3 )%
Total research and
development expenses       $ 1,754,540     $ 1,416,476     $ 1,324,625     $       338,064              24 %   $      91,851          7  %


Our research and development expenses include internal and external costs
incurred for research and development of our drugs and drug candidates and
expenses related to certain technology that we acquire or license through
business development transactions. We do not assign our internal costs, such as
salary and benefits, stock-based compensation expense, laboratory supplies and
other direct expenses and infrastructure costs, to individual drugs or drug
candidates, because the employees within our research and development groups
typically are deployed across multiple research and development programs. These
internal costs are significantly greater than our external costs, such as the
costs of services provided to us by clinical research organizations and other
outsourced research, which we allocate by individual program. All research and
development costs for our drugs and drug candidates are expensed as incurred.
Over the past three years, we have incurred $4.5 billion in research and
development expenses associated with drug discovery and development. The
successful development of our drug candidates is highly uncertain and subject to
a number of risks. In addition, the duration of clinical trials may vary
substantially according to the type, complexity and novelty of the drug
candidate and the disease indication being targeted. The FDA and comparable
agencies in foreign countries impose substantial requirements on the
introduction of therapeutic pharmaceutical products, typically requiring lengthy
and detailed laboratory and clinical testing procedures, sampling activities and
other costly and time-consuming procedures. Data obtained from nonclinical and
clinical activities at any step in the testing process may be adverse and lead
to discontinuation or redirection of development activities. Data obtained from
these activities also are susceptible to varying interpretations, which could
delay, limit or prevent regulatory approval. The duration and cost of discovery,
nonclinical studies and clinical trials may vary significantly over the life of
a project and are difficult to predict. Therefore, accurate and meaningful
estimates of the ultimate costs to bring our drug candidates to market are not
available.
In 2017, 2018 and 2019, costs related to our CF programs represented the largest
portion of our development costs. Any estimates regarding development and
regulatory timelines for our drug candidates are highly subjective and subject
to change. Until we have data from Phase 3 clinical trials, we cannot make a
meaningful estimate regarding when, or if, a clinical development program will
generate revenue and cash flow.
Research Expenses
                                                                                  2019/2018                           2018/2017
                                                                                 Comparison                          Comparison
                                                                             Increase/(Decrease)                 Increase/(Decrease)
                               2019          2018          2017                  $                 %                 $                 %
                                        (in thousands)                                 (in thousands, except percentages)
Research Expenses:
Salary and benefits         $ 134,642     $  87,773     $  81,229     $        46,869              53 %   $         6,544               8 %
Stock-based compensation
expense                        69,417        62,925        60,122               6,492              10 %             2,803               5 %
Outsourced services and
other direct expenses         116,575        89,355        85,319              27,220              30 %             4,036               5 %
Collaboration and asset
acquisition expenses          307,828       111,600         8,425             196,228              **             103,175              **

Infrastructure costs 104,310 86,707 76,111

    17,603              20 %            10,596              14 %

Total research expenses $ 732,772 $ 438,360 $ 311,206 $


  294,412              67 %   $       127,154              41 %

                                                                                                ** Not meaningful




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We expect to continue to invest in our research programs with a focus on
identifying drug candidates with the goal of creating transformative medicines
for serious diseases. Our research expenses increased by 67% in 2019 as compared
to 2018 primarily as a result of a $196.2 million increase associated with our
business development activities, as well as increased expenses related to
additional headcount and increased infrastructure costs. In 2019, our business
development activities included collaborative upfront and option payments to
CRISPR, Kymera and Molecular Templates, which are reflected in "Collaboration
and asset acquisition expenses" in the table above. The increase in salary and
benefits in 2019 was primarily related to costs associated with our acquisitions
of Exonics and Semma. In 2018, our research expenses increased as compared to
2017 primarily due to $111.6 million in expenses associated with our business
development activities, including collaborative upfront payments of $65.0
million to Merck KGaA, Darmstadt, Germany and $30.0 million to Arbor.
Development Expenses
                                                                                2019/2018                     2018/2017
                                                                                Comparison                   Comparison
                                                                           Increase/(Decrease)           Increase/(Decrease)
                              2019           2018           2017               $             %              $              %
                                        (in thousands)                             (in thousands, except percentages)
Development Expenses:
Salary and benefits       $   249,860     $ 220,128     $   208,769     $   

29,732 14 % $ 11,359 5 % Stock-based compensation expense

                       155,141       140,187         121,778         

14,954 11 % 18,409 15 % Outsourced services and other direct expenses 425,149 471,338 397,155

(46,189 ) (10 )% 74,183 19 % Collaboration and asset acquisition expenses

           10,440           250         160,250           10,190         **           (160,000 )       **

Infrastructure costs 181,178 146,213 125,467

   34,965         24  %          20,746         17  %
Total development
expenses                  $ 1,021,768     $ 978,116     $ 1,013,419     $     43,652          4  %   $     (35,303 )       (3 )%
                                                                                          ** Not meaningful


Our development expenses increased by $43.7 million, or 4%, in 2019 as compared
to 2018 and decreased by $35.3 million, or 3%, in 2018 as compared to 2017. The
increase in 2019 as compared to 2018 was primarily due to increased headcount
and infrastructure costs to support our advancing pipeline and increased
milestones related to our collaborative agreements, partially offset by
decreased expenses related to our CF programs. The decrease in 2018 as compared
to 2017 was primarily due to increased costs associated with clinical trial
expenses, including Phase 3 clinical trials evaluating elexacaftor as part of
our triple combination regimen, which were more than offset by a $160.0 million
payment to Concert Pharmaceuticals Inc. in connection with the acquisition of
VX-561 in 2017 for which there were no comparable expenses in 2018.
Sales, General and Administrative Expenses
                                                                                  2019/2018                           2018/2017
                                                                                 Comparison                          Comparison
                                                                             Increase/(Decrease)                 Increase/(Decrease)
                               2019          2018          2017                  $                 %                 $                 %
                                        (in thousands)                                 (in thousands, except percentages)
Sales, general and
administrative expenses     $ 658,498     $ 557,616     $ 496,079     $       100,882              18 %   $       61,537               12 %


Sales, general and administrative expenses increased by 18% in 2019 as compared
to 2018, and by 12% in 2018 as compared to 2017. These increases were primarily
due to increased global support for our medicines and incremental investment to
support the launch of our triple combination regimen. We expect our sales,
general and administrative expenses to continue to increase in 2020.
Contingent Consideration
In 2019, the increase in the fair value of contingent consideration of $4.5
million was due to changes in market interest rates and the time value of money
related to the contingent development and regulatory milestone payments
resulting from our acquisition of Exonics. There were no similar amounts in 2018
or 2017. In future periods, we expect the fair value of


                                       56
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contingent consideration to increase or decrease based on, among other things,
our estimates of the probability of achieving and the timing of these contingent
development and regulatory milestone payments, as well as the time value of
money changes in market interest rates.
Restructuring Expenses
We did not record any restructuring expenses in 2019. Restructuring income was
insignificant in 2018. In 2017, we recorded restructuring expenses of $14.2
million, primarily related to our decision to consolidate our research
activities into our Boston, Milton Park and San Diego locations and to close our
research site in Canada.
Intangible Asset Impairment Charge
In 2018, we recorded a $29.0 million impairment charge related to VX-210 that
was licensed from BioAxone in 2014. In 2017, we recorded a $255.3 million
impairment charge related to Parion's pulmonary ENaC platform that we licensed
from Parion in 2015 and a benefit from income taxes of $97.7 million related to
this impairment charge. Both of these impairment charges, and the related
benefits from income taxes, were attributable to non-controlling interest
because we consolidated these entities as VIEs. There were no corresponding
intangible asset impairment charges in 2019.
Other Non-Operating Income (Expense), Net
Interest Income
Interest income increased from $11.7 million in 2017 to $38.4 million in 2018
and $63.7 million in 2019, primarily due to an increase in our cash equivalents
and marketable securities and prevailing market interest rates. Our future
interest income will be dependent on the amount of, and prevailing market
interest rates on, our outstanding cash equivalents and marketable securities.
Interest Expense
Interest expense was $58.5 million in 2019, $72.5 million in 2018 and $69.3
million in 2017. The majority of our interest expense in these periods was
related to imputed interest expense associated with our leased corporate
headquarters in Boston and our research site in San Diego. On January 1, 2019,
we adopted ASC 842, Leases, which resulted in a reduction in our imputed
interest expense associated with these leases beginning in 2019. Our future
interest expense will be dependent on whether, and to what extent, we borrow
amounts under our credit facility.
Other Income (Expense), Net
In 2019, we recorded net other income of $192.2 million primarily related to
changes in the fair value of our strategic investments. In 2018, we recorded net
other expense of $0.8 million. In 2017, we recorded net other expense of $81.4
million primarily related to the deconsolidation of Parion.
In 2019 and 2018, our other income (expense), net included realized and
unrealized gains totaling $197.6 million and $2.6 million, respectively, related
to our strategic investments. We expect that, due to the volatility of the stock
price of biotechnology companies, our other income (expense), net will fluctuate
in future periods based on increases or decreases in the fair value of our
strategic investments.


                                       57
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Noncontrolling Interest (VIEs)
In 2019, we had no noncontrolling interest because we did not consolidate any
VIEs into our consolidated statement of operations. In 2018 and 2017, the net
loss attributable to noncontrolling interest recorded on our consolidated
statements of operations reflects Parion (through September 30, 2017) and
BioAxone's (through December 31, 2018) net loss for the reporting period,
adjusted for any changes in the noncontrolling interest holders' claim to net
assets, including contingent milestone, royalty and option payments. A summary
of net loss attributable to noncontrolling interest related to our VIEs for 2018
and 2017 is as follows:
                                                             2018            2017
                                                                (in thousands)

Loss attributable to noncontrolling interest before benefit from income taxes and changes in fair value of contingent payments

$    31,191     $  

223,379


Benefit from income taxes                                     (3,668 )      (114,090 )
(Increase) decrease in fair value of contingent payments     (17,730 )      

62,560

Net loss attributable to noncontrolling interest $ 9,793 $

171,849




In 2018, the net loss attributable to noncontrolling interest was primarily
related to the $29.0 million impairment charge related to VX-210 offset by an
increase in the fair value of the contingent payments payable by us to BioAxone
of $17.7 million. In 2017, the net loss attributable to noncontrolling interest
was primarily related to the $255.3 million impairment charge related to
Parion's pulmonary ENaC platform, a decrease in fair value of the contingent
payments payable by us to Parion of $69.6 million upon deconsolidation and a
benefit from income taxes of $126.2 million related to these charges.
Income Taxes
In 2017 and 2018, we were profitable from a U.S. federal income tax perspective
and used a portion of our net operating losses to offset this income since
becoming profitable. Until the fourth quarter of 2018, we maintained a valuation
allowance on the majority of our net operating losses and other deferred tax
assets. Due to this valuation allowance, we did not record a significant
provision for income taxes in 2017 and the nine months ended September 30, 2018.
In the fourth quarter of 2018, we released the valuation allowance, resulting in
a non-cash credit to net income of $1.56 billion. Further information on the
release of the valuation allowance and significant judgments related to its
release can be found below in "Critical Accounting Policies - Income Taxes."
In 2019, we recorded a provision for income taxes of $218.1 million. Starting in
2019, we began recording a provision for income taxes approximating statutory
rates on our pre-tax income and continued to utilize our net operating losses to
offset income. Our effective tax rate for 2019 is lower than the U.S. statutory
rate primarily due to excess tax benefits related to stock-based compensation
and research and development tax credits partially offset by a change in our
valuation allowance as well as the tax impact of our officers' compensation. Due
to our ability to offset our pre-tax income against previously benefited net
operating losses, we expect the majority of our tax provision to represent a
non-cash expense until our net operating losses have been fully utilized.
In 2017, we recorded a benefit from income taxes of $107.3 million, primarily
due to a total benefit from income taxes of $114.1 million attributable to
noncontrolling interest related to the impairment of Parion's pulmonary ENaC
platform and decrease in the fair value of the contingent payments payable by us
to Parion.
LIQUIDITY AND CAPITAL RESOURCES
The following table summarizes the components of our financial condition as of
December 31, 2019 and 2018:
                                                                          Increase/(Decrease)
                                           2019            2018               $             %
                                                  (in thousands, except percentages)
Cash, cash equivalents and marketable
securities                             $ 3,808,294     $ 3,168,242     $    640,052        20  %
Working Capital:
Total current assets                   $ 4,822,829     $ 3,843,109     $    979,720        25  %
Total current liabilities               (1,334,827 )    (1,120,292 )       (214,535 )     (19 )%
Total working capital                  $ 3,488,002     $ 2,722,817     $    765,185        28  %




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As of December 31, 2019, total working capital was $3.5 billion, which
represented an increase of $765.2 million from $2.7 billion as of December 31,
2018. The most significant items that increased total working capital in 2019
were $1.6 billion of cash provided by operations and $343.2 million of cash
received from issuances of common stock under our employee benefit plans and
partially offset by $1.2 billion of cash used to acquire Exonics and Semma and
$192.0 million of cash used to repurchase shares of our common stock.
Sources of Liquidity
As of December 31, 2019, we had cash, cash equivalents and marketable securities
of $3.8 billion, which represented an increase of $640.1 million from $3.2
billion as of December 31, 2018. We intend to rely on our existing cash, cash
equivalents and marketable securities together with cash flows from product
sales as our primary source of liquidity.
We may borrow up to $500.0 million pursuant to a revolving credit facility that
we entered into in 2019. We may repay and reborrow amounts under the revolving
credit agreement without penalty. Subject to certain conditions, we may request
that the borrowing capacity under this credit agreement be increased by an
additional $500.0 million, up to a total of $1.0 billion. Other possible sources
of future liquidity include commercial debt, public and private offerings of our
equity and debt securities, strategic sales of assets or businesses and
financial transactions. Negative covenants in our credit agreement may prohibit
or limit our ability to access these sources of liquidity.
Future Capital Requirements
We have significant future capital requirements including:
•      significant expected operating expenses to conduct research and
       development activities and to operate our organization; and

• substantial facility and capital lease obligations, including leases for

two buildings in Boston, Massachusetts that continue through 2028.

In addition: • We have entered into certain collaboration agreements with third parties


       that include the funding of certain research, development and
       commercialization efforts with the potential for future milestone and
       royalty payments by us upon the achievement of pre-established

developmental and regulatory targets and/or commercial targets, and we may


       enter into additional business development transactions, including
       acquisitions, collaborations and equity investments, that require
       additional capital.

• We have reached an agreement with the French government and will repay a

portion of the amounts we have collected under the ORKAMBI early access

programs in France to the French government in 2020 based on the

difference between the invoiced amount and the final amount for ORKAMBI


       distributed through these programs as reflected in the structure of the
       agreement with the French government.

• To the extent we borrow amounts under the credit agreement we entered into

in 2019, we would be required to repay any outstanding principal amounts

in 2024.




As of December 31, 2019, $464.0 million remained available to fund repurchases
under the 2019 Share Repurchase Program that we announced in July 2019.
We expect that cash flows from our products together with our current cash, cash
equivalents and marketable securities will be sufficient to fund our operations
for at least the next twelve months. The adequacy of our available funds to meet
our future operating and capital requirements will depend on many factors,
including the amounts of future revenues generated by our products, and the
potential introduction of one or more of our other drug candidates to the
market, the level of our business development activities and the number,
breadth, cost and prospects of our research and development programs.
Financing Strategy
We may raise additional capital by borrowing under credit agreements, through
public offerings or private placements of our securities or securing new
collaborative agreements or other methods of financing. We will continue to
manage our capital structure and will consider all financing opportunities,
whenever they may occur, that could strengthen our long-term liquidity profile.
There can be no assurance that any such financing opportunities will be
available on acceptable terms, if at all.


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CONTRACTUAL COMMITMENTS AND OBLIGATIONS
The following table sets forth our commitments and obligations as of
December 31, 2019:
                                                         Payments Due by Period
                                2020         2021-2022       2023-2024       2025 and later         Total
                                                             (in thousands)
Fan Pier Leases             $   66,540     $   145,177     $   150,560     $        311,884     $   674,161
Finance leases, excluding
Fan Pier Leases                 17,724          31,355          25,499              113,367         187,945
Operating leases                14,598          49,778          67,451              368,597         500,424
Research and development
costs                           51,934             565              18                    -          52,517

Total contractual commitments and obligations $ 150,796 $ 226,875 $ 243,528 $ 793,848 $ 1,415,047

Leases


We lease two buildings that are located at Fan Pier in Boston, Massachusetts. We
commenced lease payments on these two buildings in December 2013 and the initial
lease periods end in December 2028. We also lease office and laboratory space in
San Diego, California. We commenced lease payments for this building in the
second quarter of 2019 pursuant to a 16 year lease. The future minimum rental
payments that we are obligated to pay related to the San Diego building are
included in "Finance leases, excluding Fan Pier Leases," which also reflects
leases of equipment that are accounted for as finance leases. The remainder of
our real estate leases are reflected in "Operating leases" in the table above.
Research and Development Costs
The amounts reflected in "Research and development costs" do not include certain
payments we anticipate making to clinical research organizations, or CROs,
because these contracts are cancelable, at our option, with notice. However, we
historically have not cancelled such contracts. As of December 31, 2019, we had
accrued $40.2 million related to these contracts for costs incurred for services
provided through December 31, 2019, and we have approximately $200.6 million in
cancelable future commitments based on existing contracts as of December 31,
2019. These amounts reflect planned expenditures based on existing contracts and
do not reflect any future modifications to, or terminations of, existing
contracts or anticipated or potential new contracts.
Collaborative Arrangements and Asset Acquisitions
We have entered into certain research and development collaboration agreements
with third parties and acquired certain assets that include the funding of
certain development, manufacturing and commercialization efforts with the
potential for future milestone and royalty payments by us upon the achievement
of pre-established developmental, regulatory and/or commercial targets. Our
obligation to fund these efforts is contingent upon continued involvement in the
programs and/or the lack of any adverse events that could cause the
discontinuance of the programs. These payments include:
•      CFF: We pay royalties, which are included in cost of sales, to CFF on
       sales of our CF products.

• Research and Development Milestones: The majority of our in-license


       agreements and our acquisitions have milestone and royalty payments
       payable by us upon the successful achievement of pre-established
       developmental, regulatory and/or commercial targets or net sales.
       Contingent payments under these agreements become due and payable only
       upon achievement of certain milestones and are not included in the
       contractual obligations table above.


Tax-related Obligations
We exclude liabilities pertaining to uncertain tax positions from our summary of
contractual obligations as we cannot make a reliable estimate of the period of
cash settlement with the respective taxing authorities. As of December 31, 2019,
our liabilities associated with uncertain tax positions were $33.9 million.


                                       60
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Other Funding Commitments
Our table detailing contractual commitments and obligations does not include
severance payment obligations to certain of our executive officers in the event
of a not-for-cause employment termination under existing employment contracts.
We will provide information regarding these obligations annually in our proxy
statement for our annual meeting of shareholders.
In addition, we began distributing ORKAMBI through early access programs in
France in 2015. We received payment from the French government based on the
invoiced amount and remained in reimbursement discussions for ORKAMBI in France
until November 2019, when we reached an agreement for historical and future
shipments of ORKAMBI with the French government. Based on the structure of the
agreement with the French government, we will pay the difference between the
amounts collected based on the invoiced amount and the final amount for ORKAMBI
distributed through early access programs to the French government in 2020.
CRITICAL ACCOUNTING POLICIES AND ESTIMATES
Our discussion and analysis of our financial condition and results of operations
are based upon our consolidated financial statements prepared in accordance with
generally accepted accounting principles in the United States. The preparation
of these financial statements requires us to make certain estimates and
assumptions that affect the reported amounts of assets and liabilities, the
disclosure of contingent assets and liabilities at the date of the consolidated
financial statements and the reported amounts of revenues and expenses during
the reported periods. These items are monitored and analyzed by management for
changes in facts and circumstances, and material changes in these estimates
could occur in the future. Changes in estimates are reflected in reported
results for the period in which the change occurs. We base our estimates on
historical experience and various other assumptions that we believe to be
reasonable under the circumstances. Actual results may differ from our estimates
if past experience or other assumptions do not turn out to be substantially
accurate.
We believe that our application of the following accounting policies, each of
which requires significant judgments and estimates on the part of management,
are the most critical to aid in fully understanding and evaluating our reported
financial results:
• revenue recognition;


•      acquisitions, including intangible assets, goodwill and contingent
       consideration; and


• income taxes.


Our accounting policies, including the ones discussed below, are more fully
described in the Notes to our consolidated financial statements, including Note
A, "Nature of Business and Accounting Policies," included in this Annual Report
on Form 10-K.


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Revenue Recognition
Product Revenues, Net
We generate product revenues from sales in the United States and in
international markets. We sell our products principally to a limited number of
specialty pharmacy and specialty distributors in the United States, which
account for the largest portion of our total revenues, and make international
sales primarily to specialty distributors and retail chains, as well as
hospitals and clinics, many of which are government-owned or supported
customers, collectively, our customers. Our customers in the United States
subsequently resell our products to patients and health care providers. We
contract with government agencies so that our products will be eligible for
purchase by, or partial or full reimbursement from, such third-party payors. We
recognize net product revenues from sales of our products when our customers
obtain control of our products, which typically occurs upon delivery to our
customers. Revenues from our product sales are recorded at the net sales price,
or "transaction price," which requires us to make several significant estimates
regarding the net sales price.
The most significant estimate we are required to make is related to government
and private payor rebates, chargebacks, discounts and fees, collectively
rebates. The value of the rebates provided to third-party payors per course of
treatment vary significantly and are based on government-mandated discounts and
our arrangements with other third-party payors. In order to estimate our total
rebates, we estimate the percentage of prescriptions that will be covered by
each third-party payor, which is referred to as the payor mix. We track
available information regarding changes, if any, to the payor mix for our
products, to our contractual terms with third-party payors and to applicable
governmental programs and regulations and levels of our products in the
distribution channel. We adjust our estimated rebates based on new information,
including information regarding actual rebates for our products, as it becomes
available. Claims by third-party payors for rebates are submitted to us
significantly after the related sales, potentially resulting in adjustments in
the period in which the new information becomes known. Our credits to revenue
related to prior period sales, excluding the adjustment to the transaction price
for ORKAMBI distributed through early access programs in France, have not been
significant (typically less than 1% of gross product revenues) and primarily
related to U.S. rebates.
The following table summarizes activity related to our accruals for rebates
(including our refund liability to the French government related to ORKAMBI
distributed through early access programs in France as described below) for the
three years ended December 31, 2019:
                                                                     (in 

thousands)


Balance as of December 31, 2016                                     $       

81,927


Provision related to current year sales                                     

176,996


Adjustments related to prior year(s) sales                                   (8,943 )
Credits/payments made                                                      (137,765 )
Balance as of December 31, 2017                                     $       

112,215

Provision related to current year sales and the adoption of ASC 606 684,299 Adjustments related to prior year(s) sales

                                  (22,099 )
Credits/payments made                                                      (229,361 )
Balance as of December 31, 2018                                     $       

545,054


Provision related to current year sales                                     

655,980


Adjustments related to prior year(s) sales                                  (95,480 )
Credits/payments made                                                      (469,832 )
Balance as of December 31, 2019                                     $       

635,722




We have also entered into annual contracts with government-owned and supported
customers in international markets that limit the amount of annual reimbursement
we can receive. Upon exceeding the annual reimbursement amount, products are
provided free of charge, which is a material right. We defer a portion of the
consideration received, which includes upfront payments and fees, for shipments
made up to the annual reimbursement limit as "Other current liabilities." The
deferred amount is recognized as revenue when the free products are shipped. In
order to estimate the portion of the consideration received to recognize as
revenue and the portion of the amount to defer, we rely on our forecast of the
number of units we will distribute during the applicable annual period in each
international market in which our contracts with government-owned and supported
customers limit the amount of annual reimbursement we can receive. Our forecasts
are based on, among other things, our historical experience.


                                       62
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The preceding estimates and judgments materially affect our recognition of net
product revenues. Changes in our estimates of net product revenues could have a
material effect on net product revenues recorded in the period in which we
determine that change occurs.
French Early Access Programs
In 2015, we began distributing ORKAMBI through early access programs in France
and remained engaged in reimbursement discussions with the French government for
ORKAMBI, including ORKAMBI distributed through early access programs, until
November 2019, when we reached an agreement with the French government. From the
time we began distributing ORKAMBI through early access programs in France, we
have expected that the difference between the amounts collected based on the
invoiced amount and the final amount for ORKAMBI distributed through these
programs would be returned to the French government. Our refund liability
related to the early access programs in France is classified in "Accrued
expenses" on our consolidated balance sheets.
Pursuant to the revenue recognition accounting guidance that was applicable
until December 31, 2017, our ORKAMBI net product revenues for 2015, 2016 and
2017 did not include any net product revenues from sales of ORKAMBI in France.
Upon adopting ASC 606, in the first quarter of 2018, we began recognizing
ORKAMBI net product revenues in France based on a transaction price that
reflected our estimate of consideration we expected to retain that would not be
subject to a significant reversal in amounts recognized, which resulted in
revenue representing a portion of the invoiced amount. We recognized ORKAMBI net
product revenues from shipments of ORKAMBI in France based on this estimate from
the first quarter of 2018 through the third quarter of 2019.
Upon reaching an agreement with the French government for ORKAMBI, including the
final amount for ORKAMBI distributed through early access programs in France in
the fourth quarter of 2019, we updated the transaction price related to ORKAMBI
distributed through early access programs and recognized net product revenues of
$155.8 million related to these shipments, which occurred from 2015 through the
date of our agreement with the French government, because the final amount for
these shipments exceeded our previous estimate.
Acquisitions
We are required to make several significant judgments and estimates in order to
calculate the purchase price for our business combinations and then allocate it
to the assets that we have acquired and the liabilities that we have assumed on
our consolidated balance sheet. The most significant judgments and estimates
relate to the fair value of the in-process research and development assets and
contingent consideration liabilities related to these business combinations.
Based on these judgments and estimates, the fair value of the goodwill that we
record as a result of these business combinations may be material. Once
recorded, these assets are subject to quarterly impairment analysis and our
contingent consideration liability is adjusted quarterly, which requires similar
judgments and estimates.
Intangible Assets
In 2019, we recorded in-process research and development assets related to our
acquisitions of Exonics and Semma totaling $400.0 million on our consolidated
balance sheet. Each of these assets is accounted for as an indefinite-lived
intangible asset and is maintained on our consolidated balance sheet until
either the project underlying it is completed or the asset becomes impaired.
When we determine that an asset has become impaired or we abandon a project, we
write down the carrying value of the related intangible asset to its fair value
and record an impairment charge in the period in which the impairment occurs. In
2018 and 2017, we recorded full impairment charges of $29.0 million and $255.3
million for the in-process research and development assets that had previously
been recorded on our consolidated balance sheets related to our collaborations
with BioAxone and Parion, respectively.
To determine the fair value of our in-process research and development assets,
we utilize the multi-period excess earnings method of the income approach, which
requires us to make estimates of the probability of technical and regulatory
success, development cost assumptions, revenue projections and growth rates,
commercial cost estimates and appropriate discount rates. These assumptions
require significant management judgment and reasonable changes in the
assumptions can cause material changes to the fair value of the intangible
assets. Due to the pre-clinical nature of Exonics and Semma's programs, these
significant assumptions could be affected by future economic and market
conditions.
Contingent Consideration
As of December 31, 2019, we recorded $176.5 million of liabilities on our
consolidated balance sheet attributable to the fair value of the contingent
development and regulatory payments that we may owe to Exonics' former equity
holders upon


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the achievement of certain events. Our acquisition of Semma did not include
similar contingent payments; therefore, we are not required to record contingent
consideration liabilities related to our acquisition of Semma.
We record an increase or a decrease in the fair value of the contingent
consideration liability on our consolidated balance sheet and in our
consolidated statement of operations on a quarterly basis. We determine the fair
value of our contingent consideration liability using a probability weighted
discounted cash flow method of the income approach, which requires us to make
estimates of the timing of regulatory and commercial milestone achievement and
the corresponding estimated probability of technical and regulatory success
rates. Significant judgment is used in determining the appropriateness of these
assumptions during each reporting period. Reasonable changes in these
assumptions can cause material changes to the fair value of our contingent
consideration liability. Due to the pre-clinical nature of Exonics' DMD and DM1
programs, these significant assumptions could be affected by future economic and
market conditions.
Goodwill
In 2019, we recorded goodwill of $554.6 million and $397.1 million related to
our acquisitions of Semma and Exonics, respectively. Goodwill reflects the
difference between the fair value of the consideration transferred and the fair
value of the net assets acquired. Thus, the goodwill that we record is dependent
on the significant judgments and estimates inherent in the fair value of our
in-process research and development assets and contingent consideration
liabilities.
Income Taxes
We utilize the asset and liability method of accounting for income taxes. Under
this method, deferred tax assets and liabilities are determined based on the
difference between the financial statement carrying amounts and tax basis of
assets and liabilities using enacted tax rates in effect for years in which the
temporary differences are expected to reverse. If our estimate of the tax effect
of reversing temporary differences is (i) not reflective of actual outcomes,
(ii) modified to reflect new developments or interpretations of the tax law, or
(iii) revised to incorporate new accounting principles, or changes in the
expected timing or manner of the reversal, our results of operations could be
materially impacted.
We are engaged in research and development activities and incurred significant
net operating losses for a number of years before recently becoming profitable.
Since we started generating profits, we have used a portion of our net operating
losses and maintained a valuation allowance on the majority of our net operating
losses and other deferred tax assets until December 31, 2018. Accordingly, we
did not report any tax benefits relating to our net operating loss carryforwards
and income tax credit carryforwards that are available for utilization in future
periods. As of December 31, 2018, we released the valuation allowance on the
majority of our net operating losses and other deferred tax assets resulting in
a non-cash benefit from income taxes of $1.56 billion in the fourth quarter of
2018.
We provide a valuation allowance when it is more likely than not that deferred
tax assets will not be realized. On a periodic basis, we reassess our valuation
allowances on our deferred tax assets, weighing positive and negative evidence
to assess the recoverability of the deferred tax assets. In the fourth quarter
of 2018, we reassessed our valuation allowances and considered positive evidence
including significant cumulative consolidated and U.S. income over the three
years ended December 31, 2018, revenue growth, clinical program progression,
including the advancement and clinical trial data from our triple combination
regimens, and expectations regarding future profitability, and negative
evidence, including potential impact of competition on our projections and
cumulative losses in the jurisdictions. After assessing both the positive
evidence and the negative evidence, we released the valuation allowance on the
majority of our net operating losses and other deferred tax assets as of
December 31, 2018.
Significant judgment is required in making these assessments to maintain or
reverse our valuation allowances and, to the extent our future expectations
change we would have to assess the recoverability of these deferred tax assets
at that time. The determination to release the majority of our valuation
allowances increased our net income by $1.56 billion, or $6.03 per share in
2018. In 2019, we recorded a significant provision for income tax, which was the
result of utilizing previously benefitted deferred tax assets.
RECENT ACCOUNTING PRONOUNCEMENTS
Refer to Note A, "Nature of Business and Accounting Policies," in the
accompanying notes to the consolidated financial statements for a discussion of
recent accounting pronouncements and new accounting pronouncements adopted
during 2019.

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