OVERVIEW


We invest in scientific innovation to create transformative medicines for people
with serious diseases with a focus on specialty markets. We have four approved
medicines to treat cystic fibrosis, or CF, a life-threatening genetic disease,
and are focused on increasing the number of people with CF eligible and able to
receive our medicines through label expansions, approval of new medicines, and
expanded reimbursement. We are broadening our pipeline into additional disease
areas through internal research efforts and accessing external innovation
through business development transactions.
Our triple combination regimen, TRIKAFTA/KAFTRIO
(elexacaftor/tezacaftor/ivacaftor and ivacaftor), was approved in 2019 in the
United States, or U.S., and in 2020 in the European Union, or E.U. Collectively,
our four medicines are approved to treat the majority of the approximately
83,000 people with CF in North America, Europe and Australia. We are evaluating
our medicines in additional patient populations, including younger children,
with the goal of having small molecule treatments for up to 90% of people with
CF. We are also pursuing genetic therapies to address the remaining 10% of
people with CF who are not eligible for our small molecule correctors.
Beyond CF, we continue to research and develop small molecule drug candidates
for the treatment of serious diseases, including alpha-1 antitrypsin, or AAT,
deficiency, APOL1-mediated kidney diseases, and pain. We are also focused on
developing cell and genetic therapies for various diseases in our pipeline,
including sickle cell disease, or SCD, beta thalassemia, type 1 diabetes, or
T1D, Duchenne muscular dystrophy, or DMD, myotonic dystrophy, or DM1, and CF. We
are evaluating CTX001, a genetic therapy, as a potential treatment for SCD and
transfusion-dependent beta thalassemia, or TDT, the most severe form of beta
thalassemia, in collaboration with CRISPR Therapeutics AG, or CRISPR. In T1D, we
are pursuing two programs for the transplant of functional islets into patients:
transplantation of islet cells alone, using immunosuppression to protect the
implanted cells, and implantation of the islet cells inside a novel
immunoprotective device.
Financial Highlights
Revenues                                              Cash

In the third quarter of 2021, our net product Our cash, cash equivalent and marketable revenues continued to increase due to the

             securities increased to $6.96 billion as of
uptake of KAFTRIO in Europe and continued             September 30, 2021 as compared to $6.66 billion
performance of TRIKAFTA in the U.S.                   as of December 31, 

2020 primarily due to our net


                                                      product revenues and profitability, offset by
                                                      repurchases of our common stock, and a $900.0
Expenses                                              million payment we made to CRISPR in connection
Our total R&D and SG&A expenses increased to          with an amendment to our CTX001 collaboration.
$691.9 million in the third quarter of 2021 as
compared to $678.0 million in the third
quarter of 2020. In the third quarter of 2021,
cost of sales was 12% of our net product
revenues.


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Business Updates
Cystic Fibrosis Marketed Products
We expect to continue to grow our CF business by increasing the number of people
with CF eligible and able to receive our medicines. Recent progress in our CF
business is included below.
•We have signed a letter of intent with the pan-Canadian Pharmaceutical Alliance
regarding the public reimbursement of TRIKAFTA for eligible people with CF. We
have reached multiple provincial reimbursement agreements across Canada
providing approximately 90% of Canadian patients 12 years of age and older and
covered by government insurance with reimbursed access to TRIKAFTA.
•Our application for approval of TRIKAFTA in children 6 through 11 years of age
has been accepted for priority review by Health Canada.
•TRIKAFTA/KAFTRIO is now approved and reimbursed or accessible in more than 20
countries outside the U.S., including Italy, France and Canada.
Pipeline
We continue to advance a pipeline of potentially transformative small molecule,
and cell and genetic therapies aimed at treating serious diseases. Recent and
anticipated progress in activities supporting these efforts is included below.
Cystic Fibrosis
•We recently initiated our Phase 3 clinical trials evaluating the new once-daily
investigational triple combination of VX-121/tezacaftor/VX-561 (deutivacaftor).
•In collaboration with Moderna, Inc., we are seeking to discover and develop CF
mRNA therapeutics designed to treat the underlying cause of CF by enabling cells
in the lungs to produce functional CF transmembrane conductance regulator, or
CFTR, protein for the treatment of the 10% of patients who do not produce any
CFTR protein. We are conducting enabling studies and expect to submit an
Investigational New Drug Application, or IND, for this program in 2022.
Beta Thalassemia and Sickle Cell Disease
•We and our collaborator, CRISPR, are evaluating the use of a non-viral ex vivo
CRISPR gene-editing therapy, CTX001, for the treatment of TDT and severe SCD.
This approach aims to edit a person's hematopoietic stem cells to produce fetal
hemoglobin in red blood cells, which has the potential to reduce or eliminate
symptoms associated with the diseases.
•Data presented to date support the potential profile of CTX001 as a one-time
functional cure for people with TDT and severe SCD, showing consistent and
durable benefit across all treated patients. CTX001 safety data to date is
generally consistent with an autologous stem cell transplant and myeloablative
conditioning.
•Target enrollment has been achieved in the ongoing clinical trials evaluating
CTX001 in TDT and severe SCD. We anticipate submissions for regulatory approval
of CTX001 in late 2022.
Type 1 Diabetes
•We are developing cell therapies designed to replace insulin-producing islet
cells that are destroyed in people with T1D, with the goal of delivering a
potential functional cure.
•VX-880 is a stem cell-derived, allogeneic, fully differentiated,
insulin-secreting islet cell replacement therapy, using standard
immunosuppression to protect the implanted cells. Our Phase 1/2 clinical trial
evaluating VX-880 as a potential treatment for T1D is ongoing at multiple
clinical sites in the U.S. and the Clinical Trial Application has been approved
in Canada. In October 2021, we announced positive Day 90 data for the first T1D
patient in the Phase 1/2 clinical trial of VX-880.

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•We are pursuing a second program in which these stem cell-derived, fully
differentiated, insulin-secreting islet cells are encapsulated and implanted in
an immunoprotective device. We are conducting IND-enabling studies, and we
expect to submit an IND for this cells and device program in 2022.
APOL1-Mediated Kidney Diseases
•We are evaluating the potential of oral, small molecule inhibitors of APOL1
function to treat people with APOL1-mediated kidney diseases.
•Enrollment is complete in the Phase 2 proof-of-concept clinical trial
evaluating VX-147 for treatment of people with APOL1-mediated focal segmental
glomerulosclerosis with reduction of proteinuria as the primary endpoint. We
expect results from this clinical trial in the fourth quarter of 2021 and expect
that these results will inform the potential progression of VX-147 into pivotal
clinical trials in the broader population of people with APOL1-mediated
non-diabetic proteinuric kidney diseases.
Pain
•NaV1.8 is a genetically and pharmacologically validated novel target for the
treatment of pain. We previously have demonstrated clinical proof-of-concept
with a small molecule investigational treatment targeting NaV1.8 in multiple
pain indications including acute pain, neuropathic pain and musculoskeletal
pain. We have discovered multiple selective small molecule inhibitors of NaV1.8
with the objective of creating a new class of medicines that have the potential
to be highly effective for both acute and chronic pain, without the limitations
of opioids and other existing pain medications.
•Two Phase 2 dose ranging acute pain clinical trials evaluating VX-548 are
underway; one following bunionectomy surgery and the other following
abdominoplasty surgery. We expect to have data from the clinical trials
evaluating VX-548 following bunionectomy and abdominoplasty surgeries in the
first quarter of 2022.
Alpha-1 Antitrypsin Deficiency
•We are evaluating multiple preclinical compounds with the potential to correct
the misfolding of Z-AAT protein in the liver, in order to increase the systemic
levels of functional AAT. Misfolded Z-AAT protein is the root cause of AAT
deficiency and our small molecule corrector program targets both the liver and
lung manifestations of the disease.
•We plan to advance one or more novel small molecule Z-AAT correctors into the
clinic in 2022.
Investments in External Innovation
•In the third quarter of 2021, we entered into a new collaboration with Arbor
Biotechnologies, Inc., or Arbor, to enhance efforts in developing ex vivo
engineered cell therapies for multiple serious diseases using Arbor's
proprietary CRISPR gene-editing technology.
•In October 2021, we entered into a collaboration with Mammoth Biosciences,
Inc., or Mammoth, to develop in vivo gene-editing therapies for two diseases
using Mammoth's next-generation CRISPR systems.
COVID-19
We continue to monitor the impacts of the COVID-19 global pandemic on our
business. COVID-19 has not affected our supply chain or the demand for our
medicines, and we believe that we will be able to continue to supply all of our
approved medicines to patients globally. We adjusted our business operations in
response to COVID-19 and have continued to monitor local COVID-19 trends and
government guidance for each of our site locations. We are utilizing a phased,
site-specific approach to assess and permit employee access to our sites.
Currently, our sites are open to certain employees where appropriate and
permitted by local laws and guidelines.
Research
We continue to invest in our research programs and foster 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

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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 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. 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 rapid 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. For
example, in June 2021, we decided not to progress VX-864, a drug candidate for
the treatment of AAT deficiency, into late-stage development based on data
obtained from a Phase 2 clinical trial.
If we believe that data from a completed registration program support approval
of a drug candidate, we submit an New Drug Application or Biologics License
Application to the FDA requesting approval to market the drug candidate in the
U.S. and seek analogous approvals from comparable regulatory authorities in
jurisdictions outside the U.S. 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., U.K., Canada, Australia and other
jurisdictions.

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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.
Reimbursement for our products, including our potential pipeline therapies,
cannot be assured and may take significant periods of time to obtain. 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 U.S. and ex-U.S. markets.
In the U.S., we have worked successfully with third party payors in order to
promptly obtain appropriate levels of reimbursement for our CF medicines. 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 and provide
patients with appropriate levels of access to our medicines.
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 for label expansions for our current medicines. We have
obtained broad reimbursement for our CF medicines in ex-U.S. markets.
TRIKAFTA/KAFTRIO is reimbursed or accessible in more than 20 countries outside
the U.S., including England, Ireland, Italy, France and Canada. We expect to
continue to focus significant resources to obtain expanded reimbursement for our
CF medicines and pipeline therapies in ex-U.S. markets.
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, including
the acquisition of Semma Therapeutics, Inc., or Semma, a privately-held company
focused on the use of stem cell-derived human islets as a treatment for T1D, and
Exonics Therapeutics, Inc., or 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. We expect to
continue to identify and evaluate potential acquisitions and may include larger
transactions or later-stage assets.
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 a number
of companies, including Arbor, CRISPR, Kymera Therapeutics, Inc., Mammoth,
Moderna, Inc., and Obsidian Therapeutics, Inc. 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 in-licensed drug candidate to the
collaborator's operations and the other activities in which our collaborators
are engaged, the accounting for these transactions can vary significantly. In
the nine months ended September 30, 2021 and 2020, our research and development
expenses included $986.8 million and $143.3 million, respectively, related to
upfront and milestones payments pursuant to our collaboration agreements. In the
nine months ended September 30, 2021, these payments were primarily related to
the $900.0 million upfront payment we made to CRISPR in the second quarter of
2021.

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Joint Development and Commercialization Agreement with CRISPR
In 2017, we entered into a joint development and commercialization agreement, or
JDCA, with CRISPR pursuant to which we are developing and preparing to
commercialize CTX001 for TDT and SCD. This JDCA was entered into following our
exercise of an option to co-develop and co-commercialize the hemoglobinopathies
program that was contained in the collaboration agreement that we entered into
with CRISPR in 2015.
In April 2021, we and CRISPR entered into an amended and restated joint
development and commercialization agreement, or the A&R JDCA. In June 2021, we
made a $900.0 million upfront payment to CRISPR in connection with the closing
of the transactions contemplated by the A&R JDCA, which we recorded to research
and development expenses. Under the terms of the A&R JDCA, we are leading
worldwide development, manufacturing and commercialization of CTX001.
Additionally, 60% of the net profits and net losses for CTX001 are allocated to
us and 40% of the net profits and net losses for CTX001 are allocated to CRISPR.
CRISPR may earn an additional one-time $200.0 million milestone payment upon
regulatory approval of CTX001.
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 agreement with 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 C, "Collaborative Arrangements," for further information
regarding our 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 September 30, 2021, we held
strategic equity investments in public companies 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. Any changes in the fair value of equity investments with
readily determinable fair values (including publicly traded securities) are
recorded to other income (expense), net in our condensed consolidated statement
of operations.
In the nine months ended September 30, 2021 and 2020, we recorded within other
income (expense), gains of $5.0 million and $140.9 million, respectively,
related to changes in the fair value of our strategic investments, and from
sales of certain equity investments. As of September 30, 2021, the fair value of
our investments in publicly traded companies was $218.8 million. 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
volatility of the global markets, including as a result of COVID-19, and 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
                                        Three Months Ended September 30,                       Increase/(Decrease)                        Nine Months Ended September 30,                       Increase/(Decrease)
                                            2021                    2020                       $                       %                     2021                    2020                       $                       %
                                                                                                     (in thousands, except percentages and per share amounts)
Revenues                            $       1,984,164          $ 1,538,271          $            445,893              29%            $       5,501,839          $ 4,577,863          $            923,976              20%
Operating costs and expenses                  929,652              866,030                        63,622               7%                    3,597,462            2,467,365                     1,130,097              46%
Income from operations                      1,054,512              672,241                       382,271              57%                    1,904,377            2,110,498                      (206,121)            (10)%
Other non-operating income
(expense), net                                 28,229               73,630                       (45,401)            (62)%                     (44,931)             117,677                      (162,608)              **
Provision for income taxes                    230,813               78,437                       152,376              194%                     287,456              120,718                       166,738              138%
Net income                          $         851,928          $   667,434          $            184,494              28%            $       1,571,990          $ 2,107,457          $           (535,467)            (25)%

Net income per diluted common share $            3.28          $      2.53                                                           $            6.03          $      7.98
Diluted shares used in per share
calculations                                  259,707              264,079                                                                     260,877              264,031

                                                                                                                                                                                                              ** Not meaningful


Net Income
Our net income increased in the third quarter of 2021 as compared to the third
quarter of 2020 primarily due to increased revenues resulting from the continued
uptake of KAFTRIO in Europe and strong performance of TRIKAFTA in the U.S.,
including the launch of TRIKAFTA in children with CF 6 through 11 years of age.
Our increased revenues were partially offset by increased cost of sales
consistent with increased product revenues, changes in the fair value of our
strategic investments and an increased provision for income taxes.
Our net income decreased in the nine months ended September 30, 2021 as compared
to the nine months ended September 30, 2020 primarily due to the $900.0 million
upfront payment we made to CRISPR in the second quarter of 2021 in connection
with the amendment of our CTX001 collaboration. Changes in the fair value of our
strategic investments, increased cost of sales consistent with increased product
revenues and an increased provision for income taxes also decreased our net
income. These decreases to our net income were partially offset by increased
revenues resulting from the uptake of KAFTRIO in Europe and strong performance
of TRIKAFTA in the U.S.

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Revenues
                                          Three Months Ended September 30,                      Increase/(Decrease)                       Nine Months Ended September 30,                       Increase/(Decrease)
                                              2021                    2020                       $                      %                    2021                    2020                       $                       %
                                                                                                                 (in thousands, except percentages)
Product revenues, net                 $       1,984,164          $ 1,536,271          $            447,893             29%           $       5,500,839          $ 4,575,863          $            924,976              20%
Other revenues                                        -                2,000                        (2,000)            N/A                       1,000                2,000                        (1,000)            (50)%
Total revenues                        $       1,984,164          $ 1,538,271          $            445,893             29%           $       5,501,839          $ 4,577,863          $            923,976              20%


Product Revenues, Net
                                                   Three Months Ended September 30,                       Increase/(Decrease)                        Nine Months Ended September 30,                       Increase/(Decrease)
                                                       2021                    2020                       $                       %                     2021                    2020                       $                       %
                                                                                                                           (in thousands, except percentages)
TRIKAFTA/KAFTRIO                               $       1,555,772          $   960,308          $            595,464              62%            $       4,004,600          $ 2,773,256          $          1,231,344              44%
SYMDEKO/SYMKEVI                                           81,415              156,178                       (74,763)            (48)%                     339,969              501,066                      (161,097)            (32)%
ORKAMBI                                                  184,561              225,919                       (41,358)            (18)%                     624,224              692,038                       (67,814)            (10)%
KALYDECO                                                 162,416              193,866                       (31,450)            (16)%                     532,046              609,503                       (77,457)            (13)%
Total product revenues, net                    $       1,984,164          $ 1,536,271          $            447,893              29%            $       5,500,839          $ 4,575,863          $            924,976              20%


In the third quarter and nine months ended September 30, 2021, our net product
revenues increased by $447.9 million and $925.0 million, respectively, as
compared to the third quarter and nine months ended September 30, 2020. The
increase in our net product revenues in the third quarter and nine months ended
September 30, 2021 was primarily due to the continued uptake of KAFTRIO, which
was approved in the E.U. in the third quarter of 2020, and the strong
performance of TRIKAFTA in the U.S., including the launch of TRIKAFTA in June
2021 in children with CF 6 through 11 years of age. Decreases in revenues for
our products other than TRIKAFTA/KAFTRIO were primarily the result of patients
switching from these medicines to TRIKAFTA/KAFTRIO.
Our net product revenues from U.S. and ex-U.S. markets were as follows:
                                         Three Months Ended September 30,              Increase/(Decrease)              Nine Months Ended September 30,              Increase/(Decrease)
                                             2021                    2020                       %                          2021                    2020                       %
                                                                                              (in thousands, except percentages)
U.S. markets                         $       1,382,892          $ 1,222,565                    13%                 $       3,893,245          $ 3,620,467                    8%
Ex-U.S. markets                                601,272              313,706                    92%                         1,607,594              955,396                    68%

Total product revenues, net $ 1,984,164 $ 1,536,271


                   29%                 $       5,500,839          $ 4,575,863                    20%


Other Revenues
Our other revenues were $1.0 million and $2.0 million related to collaborative
milestones that we earned in the nine months ended September 30, 2021 and 2020,
respectively. Our other revenues have historically fluctuated significantly from
one period to another based on our collaborative out-license activities, and may
continue to fluctuate in the future. Our future royalty revenues will be
dependent on if, and when, our collaborators are able to successfully develop
drug candidates that we have out-licensed to them.

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Operating Costs and Expenses
                   `                    Three Months Ended September 30,                  Increase/(Decrease)                        Nine Months Ended September 30,                      Increase/(Decrease)
                                            2021                2020                      $                       %                     2021                    2020                       $                      %
                                                                                                               (in thousands, except percentages)
Cost of sales                           $  236,512          $ 186,182          $             50,330              27%            $         656,813          $   533,199          $            123,614             23%
Research and development expenses          493,751            493,497                           254               -%                    2,356,814            1,362,953                       993,861             73%
Selling, general and administrative
expenses                                   198,189            184,551                        13,638               7%                      584,935              558,613                        26,322              5%
Change in fair value of contingent
consideration                                1,200              1,800                          (600)            (33)%                      (1,100)              12,600                       (13,700)             **
Total costs and expenses                $  929,652          $ 866,030          $             63,622               7%            $       3,597,462          $ 2,467,365          $          1,130,097             46%

                                                                                                                                                                                                       ** Not meaningful


Cost of Sales
Our cost of sales primarily consists of third-party royalties payable on our net
sales of our products as well as the cost of producing inventories that
corresponded to product revenues for the reporting period. Pursuant to our
agreement with the Cystic Fibrosis Foundation our tiered third-party royalties
on sales of TRIKAFTA/KAFTRIO, SYMDEKO/SYMKEVI, KALYDECO and ORKAMBI, calculated
as a percentage of net sales, range from the single digits to the sub-teens,
with royalties on sales of TRIKAFTA/KAFTRIO slightly lower than for our other
products. Over the last several years, our cost of sales has been increasing due
to increased net product revenues. Our cost of sales as a percentage of our net
product revenues was 12% in each of the third quarter of 2021 and 2020 and nine
months ended September 30, 2021 and 2020.
Research and Development Expenses
                               Three Months Ended September 30,                  Increase/(Decrease)                        Nine Months Ended September

30,                       Increase/(Decrease)
                                   2021                2020                      $                       %                     2021                    2020                       $                       %
                                                                                                       (in thousands, except percentages)
Research expenses              $  148,620          $ 186,152          $            (37,532)            (20)%           $         426,352          $   477,560          $            (51,208)            (11)%
Development expenses              345,131            307,345                        37,786              12%                    1,930,462              885,393                     1,045,069              118%
Total research and development
expenses                       $  493,751          $ 493,497          $                254               -%            $       2,356,814          $ 1,362,953          $            993,861              73%


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 technologies 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 excluding
collaborative upfront and milestone payments, 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.
Since January 2019, we have incurred approximately $5.9 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

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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 2020 and the nine months ended September 30, 2021, costs related to our CF
programs represented the largest portion of our development costs, excluding the
$900.0 million upfront payment to CRISPR. 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 revenues and cash flows.
Research Expenses
                                   Three Months Ended September 30,                  Increase/(Decrease)                   Nine Months Ended September 30,                   Increase/(Decrease)
                                       2021                2020                      $                       %                 2021                2020                      $                       %
                                                                                                      (in thousands, except percentages)
Research Expenses:
Salary and benefits                $   34,635          $  32,145          $              2,490               8%            $  102,529          $  97,513          $              5,016               5%
Stock-based compensation expense       17,388             15,301                         2,087              14%                56,361             68,206                       (11,845)            (17)%
Outsourced services and other
direct expenses                        35,798             27,911                         7,887              28%               114,920             79,837                        35,083              44%
Collaborative payments                 26,750             80,050                       (53,300)            (67)%               54,150            143,300                       (89,150)            (62)%
Infrastructure costs                   34,049             30,745                         3,304              11%                98,392             88,704                         9,688              11%
Total research expenses            $  148,620          $ 186,152          $            (37,532)            (20)%           $  426,352          $ 477,560          $            (51,208)            (11)%


We expect to continue to invest in our research programs with a focus on
creating transformative medicines for serious diseases. Our research expenses
have historically fluctuated, and are expected to continue to fluctuate, from
one period to another due to upfront and milestone payments related to our
business development activities that are reflected in the preceding table as
collaborative payments. Our research expenses, excluding these collaborative
payments, have been increasing over the last several years as we have invested
in our pipeline and expanded our cell and genetic therapy capabilities.
Development Expenses
                                   Three Months Ended September 30,                  Increase/(Decrease)                   Nine Months Ended September 30,                    Increase/(Decrease)
                                       2021                2020                      $                       %                 2021                 2020                      $                       %
                                                                                                      (in thousands, except percentages)
Development Expenses:
Salary and benefits                $   88,568          $  73,698          $             14,870              20%           $    252,173          $ 221,828          $             30,345              14%
Stock-based compensation expense       43,607             45,469                        (1,862)            (4)%                140,051            135,526                         4,525              3%
Outsourced services and other
direct expenses                       149,627            133,595                        16,032              12%                426,441            374,926                        51,515              14%
Collaborative payments                      -                  -                             -              N/A                932,650                  -                       932,650              **
Infrastructure costs                   63,329             54,583                         8,746              16%                179,147            153,113                        26,034              17%
Total development expenses         $  345,131          $ 307,345          $             37,786              12%           $  1,930,462          $ 885,393          $          1,045,069             118%

                                                                                                                                                                               ** Not meaningful


Our development expenses increased by $37.8 million in the third quarter of 2021
as compared to third quarter of 2020, primarily due to increased expenses
related to our diversifying pipeline, including clinical trials, headcount and
infrastructure costs. Our development expenses increased by $1.05 billion in the
nine months ended September 30, 2021 as compared to the nine months ended
September 30, 2020, primarily due to the $900.0 million upfront payment to
CRISPR in the second quarter of 2021, that is included in the preceding table
under collaborative payments, and increased expenses related to our diversifying
pipeline, including clinical trials, headcount and infrastructure costs.

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Selling, General and Administrative Expenses
                                 Three Months Ended September 30,                 Increase/(Decrease)                 Nine Months Ended September 30,                  Increase/(Decrease)
                                     2021                2020                      $                      %               2021                2020                      $                      %
                                                                                                 (in thousands, except percentages)

Selling, general and
administrative expenses          $  198,189          $ 184,551          $             13,638             7%           $  584,935          $ 558,613          $             26,322             5%


Selling, general and administrative expenses increased by 7% in the third
quarter of 2021 as compared to third quarter of 2020 and increased by 5% in the
nine months ended September 30, 2021 as compared to the nine months ended
September 30, 2020, primarily due to the continued investment to support the
commercialization of our medicines and increased support for our CF pipeline
products and other disease areas.
Contingent Consideration
The fair value of contingent consideration potentially payable to Exonics'
former equity holders increased $1.2 million and decreased $1.1 million in the
third quarter and nine months ended September 30, 2021, respectively. The fair
value of contingent consideration increased by $1.8 million and $12.6 million in
the third quarter and nine months ended September 30, 2020, respectively.
Other Non-Operating Income (Expense), Net
Interest Income
Interest income was $1.1 million and $3.7 million in the third quarter and nine
months ended September 30, 2021, respectively, which was lower than our interest
income of $3.1 million and $19.9 million in the third quarter and nine months
ended September 30, 2020, respectively, due to a decrease in prevailing market
interest rates, despite an increase in our cash equivalents and
available-for-sale debt securities. Our future interest income will be dependent
on the amount of, and prevailing market interest rates on, our outstanding cash
equivalents and available-for-sale debt securities.
Interest Expense
Interest expense was $15.3 million and $46.4 million in the third quarter and
nine months ended September 30, 2021, respectively, as compared to $13.9 million
and $41.9 million in the third quarter and nine months ended September 30, 2020,
respectively. The majority of our interest expense in these periods was related
to imputed interest expense associated with our leased corporate headquarters in
Boston. Our future interest expense will be dependent on whether, and to what
extent, we borrow amounts under our credit facilities.
Other Income (Expense), Net
Other income (expense), net was income of $42.4 million and expense of $2.2
million in the third quarter and nine months ended September 30, 2021,
respectively, as compared to income of $84.4 million and $139.6 million in the
third quarter and nine months ended September 30, 2020, respectively. Our other
income (expense), net in these periods was primarily related to changes in the
fair value of 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.
Income Taxes
We recorded provisions for income taxes of $230.8 million and $287.5 million in
the third quarter and nine months ended September 30, 2021, respectively, as
compared to provisions for income taxes of $78.4 million and $120.7 million in
the third quarter and nine months ended September 30, 2020, respectively. Our
effective tax rate of 15% for the nine months ended September 30, 2021 was lower
than the U.S. statutory rate primarily due to a $100 million discrete tax
benefit associated with an increase in the U.K.'s corporate tax rate from 19% to
25%, which was enacted in June 2021 and will become effective in April 2023. Our
effective tax rate of 5% for the nine months ended September 30, 2020 was lower
than the U.S. statutory rate primarily due to (i) a $209 million discrete tax
benefit associated with the transfer of intellectual property rights to the
U.K., (ii) a discrete tax benefit associated with the write off of a long-term
intercompany receivable,

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(iii) a discrete tax benefit associated with an increase in the U.K.'s corporate
tax rate from 17% to 19%, which was enacted and became effective in July 2020,
and (iv) excess tax benefits related to stock-based compensation.

LIQUIDITY AND CAPITAL RESOURCES
The following table summarizes the components of our financial condition as of
September 30, 2021 and December 31, 2020:
                                              September 30,          December 31,                   Increase/(Decrease)
                                                  2021                   2020                        $                      %
                                                                       (in thousands)
Cash, cash equivalents and marketable
securities                                  $    6,960,885          $  6,658,897          $            301,988              5%
Working Capital:
Total current assets                             8,852,540             8,133,379                       719,161              9%
Total current liabilities                       (1,914,264)           (1,877,533)                       36,731              2%
Total working capital                       $    6,938,276          $  6,255,846          $            682,430             11%


As of September 30, 2021, total working capital was $6.94 billion, which
represented an increase of $682.4 million from $6.26 billion as of December 31,
2020. The increase in total working capital in the nine months ended September
30, 2021 was primarily related to $1.65 billion of cash provided by operations,
which was net of our $900.0 million payment to CRISPR, partially offset by $1.06
billion of cash used to repurchase our common stock pursuant to our share
repurchase programs and expenditures for property and equipment of $173.3
million.
Sources of Liquidity
As of September 30, 2021, we had cash, cash equivalents and marketable
securities of $6.96 billion, which represented an increase of $302 million from
$6.66 billion as of December 31, 2020. 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 a total of $2.5 billion pursuant to two revolving credit
facilities. We may repay and reborrow amounts under these revolving credit
agreements without penalty. Subject to certain conditions, we may request that
the borrowing capacity for each of the credit agreements be increased by an
additional $500.0 million, for a total of $3.5 billion collectively.
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. As of September 30, 2021, we were in compliance with these covenants.
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 finance lease obligations.
In addition:
•We have entered into certain collaboration agreements with third parties that
include the funding of certain research, development and commercialization
efforts. Certain of our business development transactions, including
collaborations and acquisitions, include the potential for future milestone and
royalty payments by us upon the achievement of pre-established developmental and
regulatory targets and/or commercial targets. We may enter into additional
business development transactions, including acquisitions, collaborations and
equity investments, that require additional capital.

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•To the extent we borrow amounts under the credit agreements we entered into in
2020 and 2019, we would be required to repay any outstanding principal amounts
in 2022 or 2024, respectively.
•As of September 30, 2021, we had $857.8 million available under our 2021 Share
Repurchase Program. We repurchased an additional $357.8 million of our common
stock during October 2021.
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.

CONTRACTUAL COMMITMENTS AND OBLIGATIONS
Our commitments and obligations were reported in our Annual Report on Form 10-K
for the year ended December 31, 2020, which was filed with the Securities and
Exchange Commission, or SEC, on February 11, 2021. There have been no material
changes from the contractual commitments and obligations previously disclosed in
that Annual Report on Form 10-K.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES
Our discussion and analysis of our financial condition and results of operations
are based upon our condensed consolidated financial statements prepared in
accordance with generally accepted accounting principles in the U.S. 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 condensed
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. During the nine months ended September 30, 2021, there
were no material changes to our critical accounting policies as reported in our
Annual Report on Form 10-K for the year ended December 31, 2020, which was filed
with the SEC on February 11, 2021.

RECENT ACCOUNTING PRONOUNCEMENTS
For a discussion of recent accounting pronouncements, please refer to Note A,
"Basis of Presentation and Accounting Policies."

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