The following discussion and analysis of our financial condition and results of
operations should be read together with our condensed consolidated financial
statements and the related notes to those statements included elsewhere in this
Quarterly Report on Form 10-Q. This discussion and analysis and other parts of
this report contain forward-looking statements based upon current beliefs, plans
and expectations related to future events and our future financial performance
that involve risks, uncertainties and assumptions, such as statements regarding
our intentions, plans, objectives, expectations, forecasts and projections. Our
actual results and the timing of selected events could differ materially from
those anticipated in these forward-looking statements as a result of several
factors, including those set forth under the section titled "Risk Factors"
included in this Quarterly Report on Form 10-Q.

Forward-looking statements include, but are not limited to, statements about:



•the progress, success, cost and timing of our development activities,
preclinical studies and clinical trials, and in particular the development of
our blood-brain barrier ("BBB") platform technology, programs and biomarkers,
including the initiation and completion of studies or trials and related
preparatory work, enrollment in such trials, the timing of when data from
clinical trials will become available, the advancement of new molecule entities
into clinical development and related timing, and the filing of investigational
new drug applications or clinical trial applications;

•the impact of preclinical findings on our ability to achieve exposures of our
product candidates that allow us to explore a robust pharmacodynamic range of
these candidates in humans;

•the expected potential benefits and potential revenue resulting from strategic
collaborations with third parties and our ability to attract collaborators with
development, regulatory and commercialization expertise;

•the timing or likelihood of regulatory filings and approvals;

•our ability to obtain and maintain regulatory approval of our product candidates, and any related restrictions, limitations and/or warnings in the label of any approved product candidate;

•the extent to which any dosing limitations that we have been subject to, and/or may be subject to in the future, may affect the success of our product candidates;

•the scope of protection we are able to establish and maintain for intellectual property rights covering our product candidates and technology;

•the terms and conditions of licenses granted to us and our ability to license and/or acquire additional intellectual property relating to our product candidates and BBB platform technology;

•our ability to obtain funding for our operations, including funding necessary to develop and commercialize our current and potential future product candidates;

•our plans and ability to establish sales, marketing and distribution infrastructure to commercialize any product candidates for which we obtain approval;

•future agreements with third parties in connection with the commercialization of our product candidates;

•the size and growth potential of the markets for our product candidates, if approved for commercial use, and our ability to serve those markets;


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•the rate and degree of market acceptance of our product candidates;

•existing regulations and regulatory developments in the United States and foreign countries;

•potential claims relating to our intellectual property and third-party intellectual property;

•our ability to contract with third-party suppliers and manufacturers and their ability to perform adequately;

•our plans and ability to develop our own manufacturing facilities;

•the pricing and reimbursement of our product candidates, if approved and commercialized;

•the success of competing products or platform technologies that are or may become available;

•our ability to attract and retain key managerial, scientific and medical personnel;

•the accuracy of our estimates regarding expenses, future revenue, capital requirements and needs for additional financing;

•our ability to enhance operational, financial and information management systems;



•the impact of adverse economic conditions such as instability in the financial
services sector, rising interest rates, rising inflation and increased labor
market competition;

•the impact of the COVID-19 pandemic, increased geopolitical uncertainty and related global economic disruptions and social conditions on our business; and

•our financial performance.



These forward-looking statements are subject to a number of risks,
uncertainties, and assumptions, including those described in "Risk Factors". In
some cases, you can identify these statements by terms such as "anticipate,"
"believe," "could," "estimate," "expects," "intend," "may," "plan," "potential,"
"predict," "project," "should," "will," "would" or the negative of those terms,
and similar expressions that convey uncertainty of future events or outcomes.
These forward-looking statements reflect our beliefs and views with respect to
future events and are based on estimates and assumptions as of the date of this
Quarterly Report on Form 10-Q and are subject to risks and uncertainties. We
discuss many of these risks in greater detail in the section entitled "Risk
Factors" included in Part II, Item 1A and elsewhere in this report. Moreover, we
operate in a very competitive and rapidly changing environment. New risks emerge
from time to time. It is not possible to predict all risks, nor can we assess
the impact of all factors on our business or the extent to which any factor, or
combination of factors, may cause actual results to differ materially from those
contained in any forward-looking statements we may make. Given these
uncertainties, you should not place undue reliance on these forward-looking
statements. We qualify all of the forward-looking statements in this Quarterly
Report on Form 10-Q by these cautionary statements. Except as required by law,
we assume no obligation to update these forward-looking statements publicly, or
to update the reasons actual results could differ materially from those
anticipated in any forward-looking statements, whether as a result of new
information, future events or otherwise.
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Overview

Our goal is to discover, develop and deliver therapeutics to defeat degeneration.

Our discovery and development strategy is guided by three overarching principles that we believe will significantly increase the probability of success and accelerate the timing to bring effective therapeutics to patients with neurodegenerative diseases:



•Degenogene Pathways - each of our programs addresses a molecular target or
biological pathway that is genetically validated to cause or increase the risk
for neurodegenerative diseases.

•BBB Platform Technology - we engineer our product candidates to cross the BBB and act directly in the brain by following a rigorous approach in designing small molecules and by using our proprietary TV platform technology to effectively deliver large therapeutic molecules, such as enzymes, proteins, antibodies, and oligonucleotides, across the BBB after intravenous administration.



•Biomarker-Driven Development - we discover, develop and use biomarkers to
inform dose selection, assess clinical activity, and to identify patients most
likely to respond to our therapies.

Our clinical-stage programs are:



•our ETV:IDS program, our lead brain-penetrant enzyme replacement therapy
("ERT"), enabled by our ETV, which is designed to restore iduronate 2-sulfatase
("IDS"), and reduce glycosaminoglycans ("GAGs"), both peripherally and in the
brain, in patients with mucopolysaccharidosis II ("MPS II", or "Hunter
syndrome");

•our recombinant progranulin ("PGRN") biotherapeutic enabled by our protein
transport vehicle ("PTV:PGRN"), being developed in collaboration with Takeda, to
address certain types of FTD, especially FTD-GRN caused by PGRN deficiency;

•our novel, selective, high affinity triggering receptors expressed on myeloid
cells 2 ("TREM2") antibody, enabled by our ATV, being developed in collaboration
with Takeda for the potential treatment of Alzheimer's disease;

•our leucine-rich repeat kinase 2 ("LRRK2") inhibitor program, being developed in collaboration with Biogen, to address Parkinson's disease ("PD");

•our eukaryotic initiation factor 2 B ("eIF2B") activator program to address diseases such as amyotrophic lateral sclerosis ("ALS") and frontotemporal dementia ("FTD");

•our CNS-penetrant receptor interacting serine/threonine protein kinase 1 ("RIPK1") inhibitor program, partnered with Sanofi, to address neurological diseases such as ALS, multiple sclerosis ("MS") and Alzheimer's disease; and



•a second non-CNS penetrant RIPK1 inhibitor, partnered with Sanofi, to address
peripheral inflammatory diseases such as cutaneous lupus erythematosus ("CLE")
and ulcerative colitis ("UC").

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The following table summarizes key information about our clinical stage
programs:

Program                            Product Candidate               Clinical Study(ies)                  Indication                             Operational Control
ETV:IDS                            DNL310                          Ph 1/2                               Hunter syndrome (MPS II)               Denali
                                                                   Ph 2/3
PTV:PGRN                           TAK-594/DNL593                  Ph 1/2                               FTD-GRN                                Joint with Takeda
ATV:TREM2                          TAK-920/DNL919                  Ph 1                                 Alzheimer's disease                    Joint with Takeda
LRRK2                              BIIB122/DNL151                  Ph 2b                                Parkinson's disease                    Joint with Biogen
                                                                   Ph 3
eIF2B                              DNL343                          Ph 1b                                ALS                                    Denali
                                                                   Ph 2/3 (planned)                     ALS                                    Joint with Healey Center
RIPK1 (CNS-penetrant)              SAR443820/DNL788                Ph 2                                 ALS                                    Sanofi
                                                                   Ph 2                                 MS                                     Sanofi
RIPK1 (Peripheral)                 SAR443122/DNL758                Ph 2                                 CLE                                    Sanofi
                                                                   Ph 2                                 UC                                     Sanofi

Since we commenced operations, we have devoted substantially all of our resources to discovering, acquiring and developing product candidates, building our BBB platform technology and assembling our core capabilities in understanding key neurodegenerative disease pathways.

Key operational and financing milestones in 2023 to date include:



•In January 2023, our collaboration partner Sanofi commenced dosing in the Phase
2 study of SAR443820/ DNL788 in patients with MS, triggering a $25.0 million
milestone payment, which was received in January 2023;

•In February 2023, at the WORLDSymposiumTM, we reported additional interim data
from the open-label, single-arm Phase 1/2 study of DNL310. Over 49 weeks of
DNL310 treatment in the Phase 1/2 study, positive changes across measures of
exploratory clinical outcomes including VABS-II (adaptive behavior) and BSID-III
(cognitive capabilities) scores and global impression scales were observed. The
data also suggested that DNL310 improved hearing, as assessed by auditory
brainstem response testing. Additional biomarker data out to 49 weeks continued
to demonstrate that DNL310 enabled rapid and sustained normalization of CSF
heparan sulfate to normal healthy levels and improvement in lysosomal function
biomarkers. Reduction in urine heparan sulfate and dermatan sulfate after switch
from standard of care to DNL310 suggested additional sustained peripheral
activity of DNL310. The DNL310 safety profile, with up to two years of
treatment, remained consistent with standard of care;

•In March 2023, a contingent consideration payment of $30.0 million associated
with our acquisition of F-star Gamma was triggered upon the achievement of a
specified clinical milestone in the ETV:IDS program. This payment fully
satisfies our clinical contingent consideration obligations under the Purchase
Agreement;

•In March 2023, a $10.0 million milestone payment from Takeda was triggered upon achievement of a specified clinical milestone in the Phase 1/2 study of TAK-594/DNL593 in patients with FTD-GRN, which is due in May 2023;


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•In April 2023, we entered into a new operating lease in Salt Lake City for a
59,336 square foot laboratory, office and warehouse premises, after terminating
our previous SLC lease in March 2023, decreasing future lease payment by
$6.1 million while increasing the lease term by approximately five and a half
years. The Utah site will expand our clinical manufacturing capabilities for
biologic therapeutics (large molecules) as we plan to use the premises for the
manufacture of materials for toxicology studies and drug substance for early
human clinical studies with the goal of increasing flexibility and speed in
advancing new investigational therapies into clinical trials;

•In April 2023, our collaboration partner Biogen exercised its option to develop
and commercialize our ATV program targeting Amyloid Beta, triggering an option
exercise payment, which we expect to receive in May 2023; and

•In April 2023, we presented final data from the 28-day treatment period of the
Phase 1b study of DNL343 in participants with ALS at the 75th Annual Meeting of
the American Academy of Neurology (AAN). The results continued to demonstrate
that once-daily oral dosing with DNL343 for 28 days was generally well tolerated
and demonstrated extensive CSF penetration. In addition, robust inhibition of
biomarkers associated with the ISR pathway was observed in blood samples from
study participants. The Phase 1b data continue to support plans to initiate
dosing with DNL343 in the Phase 2/3 HEALEY Platform Trial in ALS.

We do not have any products approved for sale and have not generated any product
revenue since our inception. We have funded our operations primarily from the
issuance and sale of convertible preferred stock, the sale of common stock in
public offerings, and payments received from our collaboration agreements with
Takeda, Sanofi and Biogen.

We have incurred significant operating losses to date and expect to continue to
incur operating losses for the foreseeable future. Our ability to generate
product revenue will depend on the successful development and eventual
commercialization of one or more of our product candidates. Our net losses were
$109.8 million and $65.2 million for the three months ended March 31, 2023 and
2022, respectively. As of March 31, 2023, we had an accumulated deficit of $1.08
billion. We expect to continue to incur significant expenses and operating
losses as we advance our current clinical stage programs through healthy
volunteer and patient trials; broaden and improve our BBB platform technology;
acquire, discover, validate and develop additional product candidates; obtain,
maintain, protect and enforce our intellectual property portfolio; and hire
additional personnel.

Components of Operating Results

Collaboration Revenue



To date, we have not generated any revenue from product sales and do not expect
to generate any revenue from product sales for the foreseeable future. All
revenue recognized to date has been collaboration and license revenue from our
collaboration agreements with Takeda, Sanofi and Biogen.

Future revenue may be recognized from the Takeda Collaboration Agreement, Sanofi
Collaboration Agreement, and Biogen Collaboration Agreement, and may be
generated from product sales or milestone payments, royalties and cost
reimbursement from other collaboration agreements, strategic alliances and
licensing arrangements. We expect that our revenue will fluctuate from
quarter-to-quarter and year-to-year as a result of the timing and amount of
license fees, option exercise fees, milestone payments, reimbursement of costs
incurred and other payments and product sales, to the extent any are
successfully commercialized. If we fail to complete the development of our
product candidates in a timely manner or obtain regulatory approval for them,
our ability to generate future revenue, and our results of operations and
financial position, would be materially adversely affected.
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Operating Expenses

Research and Development

Research and development activities account for a significant portion of our
operating expenses. We record research and development expenses as incurred.
Research and development expenses incurred by us for the discovery and
development of our product candidates and BBB platform technology include:

•external research and development expenses, including:



-expenses incurred under arrangements with third parties, such as contract
research organizations ("CROs"), preclinical testing organizations, contract
development and manufacturing organizations ("CDMOs"), academic and non-profit
institutions and consultants;

-expenses to acquire technologies to be used in research and development that have not reached technological feasibility and have no alternative future use;

-fees related to our license and collaboration agreements;

•personnel related expenses, including salaries, benefits and stock-based compensation expense; and

•other expenses, which include direct and allocated expenses for laboratory, facilities and other costs.

A portion of our research and development expenses are direct external expenses, which we track on a program-specific basis once a program has commenced late-stage IND-enabling studies.



Program expenses include expenses associated with our most advanced product
candidates and the discovery and development of backup or next-generation
molecules. We also track external expenses associated with our TV platform.
These expenses include external expenses incurred by us relating to our Takeda
Collaboration Agreement, Sanofi Collaboration Agreement and Biogen Collaboration
Agreement. All external costs associated with earlier stage programs, or that
benefit the entire portfolio, are tracked as a group. We also incur personnel
and other operating expenses for our research and development programs which are
presented in aggregate. These expenses primarily relate to salaries and
benefits, stock-based compensation, facility expenses including rent and
depreciation, and lab consumables. Where we share costs with our collaboration
partners, such as in our Biogen Collaboration Agreement and Takeda Collaboration
Agreement, research and development expenses may include cost sharing
reimbursements from, or payments to, our collaboration partners.

It is challenging to predict the nature, timing and estimated long-range costs
of the efforts that will be necessary to complete the development of, and obtain
regulatory approval for, any of our product candidates. This is made more
challenging by events outside of our control, such as the COVID-19 pandemic and
increased geopolitical uncertainty. We are also unable to predict when, if ever,
material net cash inflows will commence from sales or licensing of our product
candidates. This is due to the numerous risks and uncertainties associated with
drug development, including the uncertainty of:

•our ability to add and retain key research and development personnel;

•our ability to establish an appropriate safety profile with IND-enabling toxicology studies;

•our ability to successfully develop, obtain regulatory approval for, and then successfully commercialize, our product candidates;

•our successful enrollment in and completion of clinical trials;


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•the costs associated with the development of any additional product candidates we identify in-house or acquire through collaborations;

•our ability to discover, develop and utilize biomarkers to demonstrate target engagement, pathway engagement and the impact on disease progression of our molecules;

•our ability to establish agreements with third-party manufacturers for clinical supply for our clinical trials and commercial manufacturing, if our product candidates are approved;

•the terms and timing of any collaboration, license or other arrangement, including the terms and timing of any milestone payments thereunder;



•our ability to obtain and maintain patent, trade secret and other intellectual
property protection and regulatory exclusivity for our product candidates if and
when approved;

•our receipt of marketing approvals from applicable regulatory authorities;

•our ability to commercialize products, if and when approved, whether alone or in collaboration with others; and

•the continued acceptable safety profiles of the product candidates following approval.



A change in any of these variables with respect to the development of any of our
product candidates would significantly change the costs, timing and viability
associated with the development of that product candidate. We expect our
research and development expenses to increase at least over the next several
years as we continue to implement our business strategy, advance our current
programs, expand our research and development efforts, seek regulatory approvals
for any product candidates that successfully complete clinical trials, access
and develop additional product candidates and incur expenses associated with
hiring additional personnel to support our research and development efforts. In
addition, product candidates in later stages of clinical development generally
incur higher development costs than those in earlier stages of clinical
development, primarily due to the increased size and duration of later-stage
clinical trials.

General and Administrative

General and administrative expenses include personnel related expenses, such as
salaries, benefits, travel and stock-based compensation expense, expenses for
outside professional services and allocated expenses. Outside professional
services consist of legal, accounting and audit services and other consulting
fees. Allocated expenses consist of rent, depreciation and other expenses
related to our office and research and development facility not otherwise
included in research and development expenses. We expect to increase our
administrative headcount as we advance our product candidates through clinical
development, which will increase our general and administrative expenses.

Interest and Other Income, Net

Interest and other income, net, consists primarily of interest income and investment income earned on our cash, cash equivalents, and marketable securities, and sublease income.


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Results of Operations

Comparison of the three months ended March 31, 2023 and 2022

The following table sets forth the significant components of our results of operations (in thousands):



                                            Three Months Ended March 31,                              Change
                                             2023                    2022                  $                    %
Collaboration revenue:
Collaboration revenue from customers  $         35,141          $    42,141          $    (7,000)                 (17)     %

Total collaboration revenue                     35,141               42,141               (7,000)                 (17)
Operating expenses:
Research and development                       128,816               86,098               42,718                   50
General and administrative                      27,140               22,541                4,599                   20
Total operating expenses                       155,956              108,639               47,317                   44
Loss from operations                          (120,815)             (66,498)             (54,317)                  82
Interest and other income, net                  11,034                1,278                9,756                       *

Net loss                              $       (109,781)         $   (65,220)         $   (44,561)                  68      %

__________________________________________________

*Percentage is not meaningful.



Collaboration revenue. Collaboration revenue was $35.1 million and $42.1 million
for the three months ended March 31, 2023 and 2022, respectively. The decrease
in collaboration revenue of $7.0 million for the three months ended March 31,
2023, compared to the comparative period in the prior year, was primarily due to
a $29.9 million decrease in revenue from our collaboration with Takeda primarily
due to completion of the preclinical research service performance obligations,
and a decrease in revenue of $2.1 million under the Biogen Collaboration
Agreement due to completion of the ATV:Abeta Option Research Services. These
decreases are partially offset by a $25.0 million increase in revenue from our
collaboration with Sanofi as a result of the milestone achieved in January 2023
upon the commencement of dosing in a Phase 2 study of SAR443820/DNL788 in
individuals with MS.

Research and development expenses. Research and development expenses were $128.8
million and $86.1 million for the three months ended March 31, 2023 and 2022,
respectively.

The following table summarizes our research and development expenses by program
and category (in thousands):

                                                               Three Months Ended March 31,
                                                            2023                          2022
ETV:IDS program external expenses                  $             46,644          $            17,890
PTV:PGRN program external expenses                                2,846                        4,143
ATV:TREM2 program external expenses                               1,886                        2,746
TV platform and other program external expenses                   4,358                        5,743
LRRK2 program external expenses                                   1,905                        1,196
eIF2B program external expenses                                   4,648                        3,935
Other external research and development expenses                  7,715                        7,506
Personnel related expenses(1)                                    41,061                       36,064
Other unallocated research and development
expenses                                                         16,738                        9,148
Net cost sharing payments (reimbursements)(2)                     1,015                       (2,273)
Total research and development expenses            $            128,816          $            86,098


__________________________________________________



(1)Personnel related expenses include stock-based compensation expense of $16.8
million and $15.6 million for the three months ended March 31, 2023 and 2022,
respectively, reflecting an increase of $1.2 million.
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(2)There were $1.0 million in net cost sharing payments and $2.3 million in net
cost sharing reimbursements during the three months ended March 31, 2023 and
2022, respectively. For the three months ended March 31, 2023, net cost sharing
payments includes cost sharing payments of $4.2 million owed to Biogen,
partially offset by cost sharing reimbursements from Takeda for the PTV:PGRN
program (included within PTV:PGRN program external program expenses and
Personnel related expenses) of $1.5 million and the ATV:TREM2 program (included
within ATV:TREM2 program external expenses and Personnel related expenses) of
$1.7 million, respectively. For the three months ended March 31, 2022, net cost
sharing reimbursements includes $2.9 million of reimbursements from Takeda for
the PTV:PGRN program (included within PTV:PGRN program external program expenses
and Personnel related expenses) and $2.1 million of reimbursements from Takeda
for the ATV:TREM2 program (included within ATV:TREM2 program external expenses
and Personnel related expenses). These cost sharing reimbursements were
partially offset by cost sharing payments of $2.7 million to Biogen for LRRK2
program external expenses and program internal expenses (included within
Personnel related expenses).

The increase in research and development expenses of approximately $42.7 million
for the three months ended March 31, 2023 compared to the three months ended
March 31, 2022, was primarily attributable to the following:

•An increase of $28.8 million in ETV:IDS program external expenses primarily due
to the accrued contingent consideration payment of $30.0 million related to the
acquisition of F-star Gamma, which was triggered in March 2023 upon the
achievement of a specified clinical milestone in the ETV:IDS program;

•An increase of $7.6 million in other unallocated research and development
expenses primarily due to increased facility costs as a result of accelerated
depreciation on leasehold improvements associated with the termination of the
SLC Lease; and

•An increase of $5.0 million in personnel related expenses, consisting of $3.8
million in employee compensation and $1.2 million in stock-based compensation
expense pertaining to additional salaries, related expenses, and equity award
grants driven by an increase in our research and development headcount.

These increases were partially offset by a decrease of $3.3 million in net cost
sharing reimbursements due to the transition of LRRK2 clinical activities to
Biogen, resulting in cost sharing reimbursements flipping to payments; and
decreases of $1.4 million and $1.3 million in TV platform and other program
external expenses and PTV:PGRN program external expenses, respectively, due to
the timing of significant external research and manufacturing related activities
year over year.

General and administrative expenses. General and administrative expenses were
$27.1 million for the three months ended March 31, 2023 compared to
$22.5 million for the three months ended March 31, 2022. The increase of $4.6
million was primarily attributable to the following:

•$2.7 million of increased facility costs, consulting, and legal professional service expenses; and



•$1.8 million of increased personnel-related expenses consisting of employee
compensation and stock-based compensation expense associated with additional
salary expenses and equity award grants driven by higher general and
administrative headcount.

Liquidity and Capital Resources

Sources of Liquidity



We fund our operations primarily with the proceeds from the sale of common stock
in public offerings and payments received from our collaboration agreements with
Takeda, Sanofi, and Biogen.

In our January 2020 follow-on offering, we sold 9.0 million shares of common
stock (inclusive of shares sold pursuant to an overallotment option granted to
the underwriters in connection with the offering) through an underwritten public
offering at a price of $23.00 per share for aggregate net proceeds of
approximately $193.9 million.

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In February 2022, we established a registered "at-the-market" facility for the
sale of up to $400.0 million of shares of common stock from time to time by
entering into an equity distribution agreement with Goldman Sachs & Co. LLC, SVB
Securities LLC and Cantor Fitzgerald & Co. as sales agents. We have not yet
issued any shares under the facility.

In October 2022, we sold 11.9 million shares of common stock (inclusive of
shares sold pursuant to an overallotment option granted to the underwriters in
connection with the offering) through an underwritten public offering at a price
of $26.50 per share for aggregate net proceeds of approximately $296.2 million.

Pursuant to our collaboration agreements with Takeda, Sanofi and Biogen, through
March 31, 2023 we have received upfront, option and milestone payments of $105.0
million, $225.0 million, and $560.0 million, respectively, and have also
received $31.9 million and $16.2 million of gross cost sharing reimbursements
from Takeda and Biogen, respectively, and received $13.7 million of
reimbursement from Sanofi for the Phase 1b trial for DNL747 for ALS and
associated activities.

Further, under associated stock purchase agreements with Takeda and Biogen, through March 31, 2023 we have received $110.0 million and $465.0 million, respectively, for the sale and issuance of shares of our common stock to these collaboration partners.

As of March 31, 2023, we had cash, cash equivalents and marketable securities in the amount of $1.29 billion.

Future Funding Requirements and Commitments



To date, we have not generated any product revenue. We do not expect to generate
any product revenue unless and until we obtain regulatory approval of and
commercialize any of our product candidates, and we do not know when, or if,
either will occur.

We expect to continue to incur significant losses for the foreseeable future,
and we expect the losses to increase as we expand our research and development
activities and continue the development of, and seek regulatory approvals for,
our product candidates, and begin to commercialize any approved products.
Further, we expect general and administrative expenses to increase as we
continue to incur additional costs associated with supporting our growing
operations. We are subject to all of the risks typically related to the
development of new product candidates, and we may encounter unforeseen expenses,
difficulties, complications, delays and other unknown factors that may adversely
affect our business. We anticipate that we will need substantial additional
funding in connection with our continuing operations.

Until we can generate a sufficient amount of revenue from the commercialization
of our product candidates or from our existing collaboration agreements, or
future agreements with other third parties, if ever, we expect to finance our
future cash needs through public or private equity or debt financings.
Additional capital may not be available on reasonable terms, if at all. If we
are unable to raise additional capital in sufficient amounts or on terms
acceptable to us, we may have to significantly delay, scale back or discontinue
the development or commercialization of one or more of our product candidates.
If we raise additional funds through the issuance of additional debt or equity
securities, it could result in dilution to our existing stockholders, increased
fixed payment obligations and the existence of securities with rights that may
be senior to those of our common stock. If we incur indebtedness, we could
become subject to covenants that would restrict our operations and potentially
impair our competitiveness, such as limitations on our ability to incur
additional debt, limitations on our ability to acquire, sell or license
intellectual property rights and other operating restrictions that could
adversely impact our ability to conduct our business. Additionally, any future
collaborations we enter into with third parties may provide capital in the near
term but limit our potential cash flow and revenue in the future. Any of the
foregoing could significantly harm our business, financial condition and
prospects.

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Since our inception, we have incurred significant losses and negative cash flows
from operations. We have an accumulated deficit of $1.08 billion through March
31, 2023. We expect to incur substantial additional losses in the future as we
conduct and expand our research and development activities. We believe that our
existing cash, cash equivalents and marketable securities will be sufficient to
enable us to fund our projected operations through at least the twelve months
following the filing date of this Quarterly Report on Form 10-Q, including our
existing commitments as outlined below. We have based this estimate on
assumptions that may prove to be wrong, and we could utilize our available
capital resources sooner than we currently expect. In the longer term, we
anticipate that we will need substantial additional resources to fund our
operations and meet future commitments.

Our existing commitments primarily relate to our obligations under existing
lease agreements, and certain clinical and manufacturing agreements, including
the DMSA with Lonza Sales AG ("Lonza") for the development and manufacture of
biologic products. As of March 31, 2023, operating lease liabilities were $57.1
million. Under the SLC lease which was executed in April 2023, we have future
undiscounted lease payments totaling approximately $13.4 million. Under the DMSA
with Lonza, and certain other clinical and manufacturing agreements, we had
total non-refundable purchase commitments as of March 31, 2023 of $86.5 million,
with certain amounts subject to cost sharing with Takeda. While the lease
obligations span multiple years, the majority of the purchase commitments with
Lonza and other clinical and manufacturing agreements are due within twelve
months, with some spanning several years. These commitments are more fully
described in Note 7 - Commitments and Contingencies of our unaudited condensed
consolidated financial statements included in this Quarterly Report on Form
10-Q.

Our future funding requirements, including changes to and new commitments, will depend on many factors, including:

•the timing and progress of preclinical and clinical development activities;

•the number and scope of preclinical and clinical programs we decide to pursue;

•the progress of the development efforts of third parties with whom we have entered into license and collaboration agreements;

•our ability to maintain our current research and development programs and to establish new research and development, license or collaboration arrangements;

•our ability and success in securing manufacturing relationships with third parties or in establishing and operating a manufacturing facility;

•the costs involved in prosecuting, defending and enforcing patent claims and other intellectual property claims;

•the cost and timing of regulatory approvals;

•our efforts to enhance operational, financial and information management systems and hire additional personnel, including personnel to support development of our product candidates; and

•the costs and ongoing investments to in-license and/or acquire additional technologies.



A change in the outcome of any of these or other variables with respect to the
development of any of our product candidates could significantly change the
costs and timing associated with the development of that product candidate.
Furthermore, our operating plans may change in the future, and we may need
additional funds to meet operational needs and capital requirements associated
with such operating plans.
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Cash Flows

The following table sets forth a summary of the primary sources and uses of cash for each of the periods presented below (in thousands):



                                                             Three Months 

Ended March 31,


                                                            2023            

2022


Net cash used in operating activities               $         (58,802)         $        (72,109)
Net cash used in investing activities                         (92,715)                 (117,878)
Net cash provided by financing activities                       1,604                     1,463
Net decrease in cash, cash equivalents and
restricted cash                                     $        (149,913)

$ (188,524)

Net Cash Used In Operating Activities



During the three months ended March 31, 2023, net cash used in operating
activities was $58.8 million, which consisted of a net loss of $109.8 million,
adjusted by non-cash items primarily related to stock-based compensation and
depreciation, net amortization of discounts on marketable securities and
non-cash rent expenses. Cash used in operating activities was also driven by
changes in our operating assets and liabilities.

Net Cash Used In Investing Activities

During the three months ended March 31, 2023, net cash used in investing activities was $92.7 million, which consisted of $523.7 million of purchases of marketable securities and $2.8 million of capital expenditures to purchase property and equipment, partially offset by $433.8 million in proceeds from maturities of marketable securities.

Net Cash Provided By Financing Activities

During the three months ended March 31, 2023, cash provided by financing activities was $1.6 million in proceeds from the exercise of options to purchase common stock.

Critical Accounting Estimates



This discussion and analysis of our financial condition and results of
operations is based on our consolidated financial statements, which have been
prepared in accordance with U.S. GAAP. The preparation of these consolidated
financial statements requires us to make estimates and assumptions that affect
the reported amounts of assets and liabilities and the disclosure of contingent
assets and liabilities at the date of the consolidated financial statements, as
well as the reported revenues recognized and expenses incurred during the
reporting periods. Our estimates are based on our historical experience and on
various other factors that we believe are reasonable under the circumstances,
the results of which form the basis for making judgments about the carrying
value of assets and liabilities that are not readily apparent from other
sources. Actual results may differ from these estimates under different
assumptions or conditions. Our significant accounting policies are described in
detail in the notes to our consolidated financial statements included elsewhere
in this report. In our "Management's Discussion and Analysis of Financial
Condition and Results of Operations" included in our Annual Report on Form 10-K
for the year ended December 31, 2022, as filed with the SEC on February 27,
2023, we described the accounting estimates that we believe involve a
significant level of estimation uncertainty which could have a material impact
on our financial condition or results of operations. There have been no material
changes to these critical accounting estimates during the three months ended
March 31, 2023.
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Recent Accounting Pronouncements



There have been no new accounting pronouncements or changes to accounting
pronouncements during the three months ended March 31, 2023, as compared to the
recent accounting pronouncements described in our Annual Report on Form 10-K for
the year ended December 31, 2022, as filed with the SEC on February 27, 2023,
that are of significance or potential significance to us.

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