The following discussion and analysis of our financial condition and results of
operations should be read in conjunction with our audited financial statements
and related notes appearing elsewhere in this Annual Report on Form 10-K. Some
of the information contained in this discussion and analysis or set forth
elsewhere in this Annual Report on Form 10-K, including information with respect
to our future results of operations or financial condition, business strategy
and plans and objectives of management for future operations, includes
forward-looking statements that involve risks and uncertainties and should be
read together with the "Risk Factors" section of this Annual Report on Form 10-K
for a discussion of important factors that could cause our actual results to
differ materially from those described in or implied by these forward-looking
statements contained in the following discussion and analysis.

Overview



We are a clinical-stage biopharmaceutical company developing a novel
disease-modifying approach to target what we believe to be a key underlying
cause of AD. Alzheimer's disease is a progressive neurodegenerative disease of
the brain that leads to loss of memory and cognitive functions and ultimately
results in death. Our scientific founders pioneered research on soluble AßOs,
which are globular assemblies of the Aß peptide that are distinct from Aß
monomers and amyloid plaques. Based on decades of research and supporting
evidence, AßOs have gained increasing scientific acceptance as a primary toxin
involved in the initiation and propagation of AD pathology. We are currently
focused on advancing a targeted immunotherapy drug candidate, ACU193, through
clinical proof of mechanism trials in early AD patients. ACU193 is a recombinant
humanized IgG2 mAb that was designed to selectively target AßOs, has
demonstrated functional and protective effects in in vitro assays, and has
demonstrated in vivo safety and pharmacologic activity in multiple animal
species, including transgenic models for AD.

We initiated a Phase 1 clinical trial of ACU193 in the second quarter of 2021,
which we named "INTERCEPT-AD." This trial enrolled 65 patients with mild
dementia or MCI due to AD, conditions referred to as "early AD." INTERCEPT-AD is
a U.S.-based, multi-center, randomized, double-blind, placebo-controlled
clinical trial with overlapping SAD and MAD cohorts involving patients with
early AD. The overall objective of the trial is to evaluate the safety and
tolerability of ACU193 and to establish clinical proof of mechanism of ACU193
administered intravenously. The primary trial endpoints are focused on safety
and immunogenicity. An important safety measure will be the use of MRI to assess
the presence or absence of ARIA. Secondary endpoints include pharmacokinetics in
plasma and CSF and target engagement as evidenced by detection of ACU193 bound
to AßOs in CSF. Clinical scales typically used in AD trials as well as
computerized cognitive testing and arterial spin labelling with MRI scans are
included as exploratory measures. In October 2021, we announced the initial
dosing of the first patient in the INTERCEPT-AD trial and the subsequent
successful sentinel safety review of the first two patients.

We were incorporated in 1996 and were party to an exclusive license and research
collaboration with Merck in 2003. Although we acquired the exclusive rights to
ACU193 from Merck in 2011 following Merck's strategic decision to focus its AD
development efforts on a different product candidate, we did not recommence
meaningful operations until we completed our first institutional fundraising in
2018. Since 2018, we have devoted substantially all of our efforts to organizing
and staffing our company, business planning, raising capital, conducting
discovery, research and development activities, and providing general and
administrative support for these operations. We do not have any products
approved for sale and have not generated any revenue from product sales. We have
funded our operations primarily through the sale of our convertible preferred
stock and common stock, the issuance of notes, grant revenue and during our
collaboration with Merck, certain payments received under our collaboration
agreement.

Prior to our IPO, which closed on July 6, 2021, we raised an aggregate of $99.4
million of gross proceeds through the issuance of convertible preferred stock,
as well as sales of common stock and issuance of notes that were converted to
preferred stock, with the vast majority of this capital being raised since our
Series A-1 convertible preferred stock, or Series A-1, financing in 2018. In
2020, we conducted a Series B convertible preferred stock, or Series B,
financing, with the funding to occur in two tranches. We closed the first
tranche of the Series B financing in November 2020, selling 11,862,043 shares of
Series B at $3.80 per share for gross proceeds of $45.1 million. On June 9,
2021, our board of directors and the holders of more than 67% of the outstanding
shares of Series B preferred stock elected to waive the achievement of the
milestone event. On June 17, 2021, we closed the second tranche of our Series B
preferred stock financing, pursuant to which certain of our investors funded an
additional $30.0 million in exchange for 7,908,027 shares of Series B preferred
stock.

On July 6, 2021, we issued 9,999,999 shares of our common stock in the IPO, and
on July 8, 2021, we issued an additional 1,499,999 shares of our common stock
that were purchased by the underwriters pursuant to the underwriters' option to
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purchase additional shares at the public offering price less underwriting discounts and commissions. The price to the public for each share was $16.00. The aggregate net proceeds from the IPO, after underwriting discounts and commissions and other offering expenses of $15.4 million, were $168.6 million.



We have incurred net losses and negative cash flows from operations since our
inception. Our net losses were $42.9 million and $100.6 million for the years
ended December 31, 2022 and 2021, respectively. Approximately $32.4 million, or
76%, of the net loss for the year ended December 31, 2022 was due to research
and development spending. As of December 31, 2022, we had an accumulated deficit
of $170.4 million. Our net losses and cash flows from operations may fluctuate
significantly from quarter-to-quarter and year-to-year, depending on the timing
of nonclinical studies, clinical trials and our expenditures on other research
and development activities. Our net losses and cash flows from operations may
fluctuate significantly from quarter-to-quarter and year-to-year, depending on
the timing of nonclinical studies, clinical trials and our expenditures on other
research and development activities. We expect our expenses and operating losses
will increase substantially for the foreseeable future as we advance ACU193 in
clinical trials, seek to expand our product candidate portfolio through
developing additional product candidates, grow our clinical, regulatory and
quality capabilities, and incur additional costs associated with operating as a
public company. It is likely that we will seek third-party collaborators for the
future commercialization of ACU193 or any other product candidate that is
approved for marketing. However, we may seek to commercialize our products at
our own expense, which would require us to incur significant additional expenses
for marketing, sales, manufacturing and distribution.

We will not generate revenue from product sales unless and until we successfully
complete clinical development and obtain regulatory approval for our product
candidates. In addition, if we obtain regulatory approval for our product
candidates and do not enter into a third-party commercialization partnership, we
expect to incur significant expenses related to developing our commercialization
capability to support product sales, marketing, manufacturing and distribution
activities.

As a result, we will need substantial additional funding to support our
continuing operations and pursue our growth strategy. Until we can generate
significant revenue from product sales, if ever, we expect to finance our
operations through a combination of public or private equity offerings and debt
financings or other sources, such as potential collaboration agreements,
strategic alliances and licensing arrangements. We may be unable to raise
additional funds or enter into such other agreements or arrangements when needed
on acceptable terms, or at all. Our failure to raise capital or enter into such
agreements as, and when needed, could have a material adverse effect on our
business, results of operations and financial condition.

As of December 31, 2022, we had cash and cash equivalents of $130.1 million and
$63.3 million in marketable securities. Based on our current operating plan, we
expect that our existing cash and cash equivalents and marketable securities
will be sufficient to enable us to fund our operating expenses and capital
expenditure requirements at least through 2025. We have based this estimate on
assumptions that may prove to be wrong, and we could exhaust our available
capital resources sooner than we expect. See "Liquidity and Capital Resources."

Components of Results of Operations

Operating Expenses

Our operating expenses consist of research and development expenses and general and administrative expenses.

Research and Development Expenses



Research and development costs primarily consist of direct costs associated with
consultants and materials, biologic storage, third party, contract research
organizations, or CRO, costs and contract manufacturing organization, or CMO,
expenses, salaries and other personnel-related expenses. Research and
development costs are expensed as incurred. More specifically, these costs
include:

•costs of funding research performed by third parties that conduct research and development and nonclinical and clinical activities on our behalf;

•costs of manufacturing drug supply and drug product;

•costs of conducting nonclinical studies and clinical trials of our product candidates;

•consulting and professional fees related to research and development activities, including equity-based compensation to non-employees;


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•costs related to compliance with clinical regulatory requirements; and

•employee-related expenses, including salaries, benefits and stock-based compensation expense for our research and development personnel.



As we currently only have one product candidate, ACU193, in development, we do
not separately track expenses by program. Further, we have historically relied
primarily on consultants for research and development activities, and as such,
our internal research and development costs for the years ended December 31,
2022 and 2021 represent 20% or less of our total research and development
expenses. Our research and development expenses increased substantially in the
year ended December 31, 2022 in connection with initiating the clinical trial
for our ACU193 program in 2021.

General and Administrative Expenses



General and administrative expenses consist primarily of employee-related
expenses, including stock-based compensation costs, as well as business
insurance, management and business consultants and other related costs. General
and administrative expenses also include professional fees for legal,
consulting, accounting, auditing, tax and patent services, investor and public
relations, board of directors' expenses, franchise taxes and rent.

We expect that our general and administrative expenses will increase as our
organization and headcount needed in the future grows to support continued
research and development activities and potential commercialization of our
product candidates. These increases will likely include increased costs related
to the hiring of additional personnel and fees to outside consultants, attorneys
and accountants, among other expenses. Additionally, we expect to continue to
incur increased expenses associated with being a public company, including costs
of additional personnel, accounting, audit, legal, regulatory and tax-related
services associated with maintaining compliance with exchange listing and SEC
requirements, director and officer insurance costs, and investor and public
relations costs.

Other Income (Expense)



Other income (expense) primarily includes interest income, net and other income,
net. Following our IPO, we made investments in marketable securities and the
interest income earned, as well as amortization and accretion of premiums and
discounts, are recorded in interest income, net. Other income (expense), net
generally consists of sublease income offset by fees incurred on our investments
in marketable securities.

Prior to our IPO on July 6, 2021, changes in the fair values of the Series A-1
warrant liability and the Series B tranche rights were recognized as a component
of other income (expense). The Series A-1 warrant liability and the Series B
tranche rights were initially recorded at fair value as liabilities on our
balance sheet. Each was subsequently re-measured at fair value at the end of
each reporting period and also upon the exercise of the warrant on June 22,
2021, and upon settlement of the tranche rights with the milestone closing for
the Series B on June 17, 2021.
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Results of Operations

Comparison of the Years Ended December 31, 2022 and 2021

The following table summarizes our results of operations for the years ended December 31, 2022 and 2021 (in thousands):



                                                     Year Ended December 31,                             Change
                                                     2022                  2021                 $                    %
Costs and operating expenses
Research and development                      $     32,361             $   12,305          $  20,056                    163  %
General and administrative                          12,876                  7,279              5,597                     77  %
Total operating expenses                            45,237                 19,584             25,653                    131  %
Loss from operations                               (45,237)               (19,584)           (25,653)                   131  %
Other income (expense)
Interest income, net                                 2,392                     84              2,308                         *
Other income, net                                      (11)                    51                (62)                  (122) %
Change in fair value of preferred stock
tranche rights liability and preferred stock
warrant liability                                        -                (81,157)            81,157                         *
Total other income (expense)                         2,381                (81,022)            83,403                         *
Net loss                                      $    (42,856)            $ (100,606)         $  57,750                    (57) %


*Not meaningful

Research and Development Expenses



Research and development expenses were $32.4 million and $12.3 million for the
years ended December 31, 2022 and 2021, respectively. The $20.1 million increase
was primarily due to increases in expenses of $7.2 million for CRO costs, $5.0
million for consulting costs, $3.3 million for personnel-related expenses, $2.9
million for drug safety testing and $1.3 million for materials; all related to
our ongoing clinical trial which was initiated in 2021 and nonclinical research
and development activity.

General and Administrative Expenses



General and administrative expenses were $12.9 million and $7.3 million for the
years ended December 31, 2022 and 2021, respectively. The $5.6 million increase
was primarily due to increased expenses as a public company, as well as
additions to its financial and administrative infrastructure and included
increases of $3.4 million for personnel expenses, including stock compensation
costs, $1.1 million for insurance expenses, $0.5 million for marketing costs,
including investor relations, $0.2 million for legal expenses, $0.2 million for
recruiting costs and $0.2 million for travel and entertainment.

Other Income (Expense)



Other income was $2.4 million for the year ended December 31, 2022, which was
due to net interest income on our portfolio of marketable securities. Other
expense was $81.0 million for the year ended December 31, 2021, primarily due to
increases in the fair values of the Series B tranche liability and Series A-1
warrant liability of $76.2 million and $5.0 million, respectively, offset by
$0.1 million of net interest income from our portfolio of marketable securities
and $0.1 million of other income, net, which was primarily related to sublease
income.

Liquidity and Capital Resources



We have incurred net losses since inception. We have not generated any revenue
from product sales or any other sources and have incurred significant operating
losses. We have not yet commercialized any products and we do not expect to
generate revenue from sales of any drug candidates for at least several years,
if ever.
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Our operations have been financed primarily by net proceeds from the sale and
issuance of our common stock and convertible preferred stock, net proceeds from
our IPO, the issuance of notes, grant revenue and, during our collaboration with
Merck, certain payments received under our collaboration agreement.

On July 1, 2022, we filed a shelf registration statement on Form S-3, or the
Registration Statement. Pursuant to the Registration Statement, we may offer and
sell securities having an aggregate public offering price of up to $200.0
million. In connection with the filing of the Registration Statement, we also
entered into a sales agreement with BofA Securities, Inc. and Stifel, Nicolaus &
Company, Incorporated, or the Sales Agents, pursuant to which we may issue and
sell shares of our common stock for an aggregate offering price of up to $50.0
million under an at-the-market offering program, or ATM,
which is included in the $200.0 million of securities that may be offered
pursuant to the Registration Statement. Pursuant to the ATM, we will pay the
Sales Agents a commission rate of up to 3.0% of the gross proceeds from the sale
of any shares of our common stock. We are not obligated to make any sales of
shares of our common stock under the ATM.

In October 2022, the Company issued 422,160 shares of common stock under the ATM for net proceeds of $3.8 million, at a weighted average price of $10.06 per share.



As of December 31, 2022, our cash and cash equivalents totaled $130.1 million.
Additionally, we had $63.3 million of available-for-sale marketable securities
as of December 31, 2022, which mature over the next two years. Based on our
current operating plan, we expect that our existing cash and cash equivalents
and marketable securities will be sufficient to enable us to fund our operating
expenses and capital expenditure requirements at least through 2025. We have
based this estimate on assumptions that may prove to be wrong, and we could
exhaust our available capital resources sooner than we expect.

We enter into contracts in the normal course of business with CROs and CMOs for
clinical trials, nonclinical research studies and testing, manufacturing and
other services and products for operating purposes. These contracts do not
contain any minimum purchase commitments and are generally cancellable by us
after giving a certain amount notice. Payments due upon cancellation consist
only of payments for services provided and expenses incurred up to the date of
cancellation.

Cash Flows

The following table summarizes our sources and uses of cash (in thousands):



                                                            Year Ended 

December 31,


                                                              2022          

2021


Net cash used in operating activities                 $     (35,153)          $ (17,961)
Net cash provided by (used in) investing activities          39,185         

(104,120)


Net cash provided by financing activities                     3,907         

200,466


Net change in cash and cash equivalents               $       7,939           $  78,385


Operating Activities

Net cash used in operating activities was $35.2 million for the year ended
December 31, 2022, which primarily consisted of net loss of $42.9 million, which
was reduced by non-cash adjustments of $3.1 million for stock-based compensation
expense and $0.5 million for amortization of premiums and accretion of discounts
on marketable securities, net, plus cash provided of $2.6 million from accrued
clinical trial expenses and $1.7 million from prepaid expenses mainly associated
with research and development. Cash used in operating activities during the year
ended December 31, 2022, was mainly the result of our ongoing research and
development activities as we continued our clinical trial, which we initiated in
2021.

Net cash used in operating activities was $18.0 million for the year ended
December 31, 2021, which primarily consisted of net loss of $100.6 million,
which was reduced by non-cash adjustments of $81.2 million related to the change
in the fair values of the Series B tranche liability and the Series A-1 warrant
liability and $0.9 million for stock-based compensation expenses, plus cash
provided of $3.5 million from accrued expenses and other current liabilities
mainly related to research and development expenses and employee-related
accruals and $0.6 million of cash provided by accounts payable; partially offset
by $3.9 million of cash used for prepaid expenses mainly associated with
research and development activities and insurance. Cash used in operating
activities during the year ended December 31, 2021, was the result of our
research and development activities as we commenced our clinical trial, as well
as costs associated with the transition from a private to a public company.
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Investing Activities



Net cash provided by investing activities for the year ended December 31, 2022
was $39.2 million and was predominantly related to the maturities and sales of
marketable securities of $80.9 million, partially offset by $41.5 million in
purchases of marketable securities and $0.2 million for purchases of computer
hardware and furniture.

Net cash used in investing activities for the year ended December 31, 2021 was
$104.1 million and was predominantly related to the purchase of marketable
securities, but also included less than $0.1 million for purchases of computer
hardware.

Financing Activities

Net cash provided by financing activities for the year ended December 31, 2022
was $3.9 million primarily due to $3.8 million in proceeds from the issuance of
common stock, net of issuance costs, and $0.1 million from the exercise of stock
options.

Net cash provided by financing activities during the year ended December 31,
2021 was primarily due to our IPO for net proceeds of $168.6 million, the
closing of the second tranche of our Series B convertible preferred stock for
gross proceeds of $30.0 million, plus a total of $1.9 million received from the
exercise of the Series A-1 preferred warrant, as well as proceeds from exercises
of common stock warrants.

Funding Requirements

We expect our expenses to increase in connection with our ongoing activities,
particularly as we continue our research and development, conduct clinical
trials, and seek marketing approval for our current and any of our future
product candidates. Furthermore, we have incurred and expect to incur additional
costs associated with operating as a public company following our July 2021 IPO.
It is likely that we will seek third-party collaborators for the future
commercialization of ACU193 or any other product candidate that is approved for
marketing. However, we may seek to commercialize our products at our own
expense, which would require us to incur significant additional expenses for
marketing, sales, manufacturing and distribution, which costs we may seek to
offset through entry into collaboration agreements with third parties. As a
result, we expect that we will need to obtain substantial additional funding in
connection with our future operations. If we are unable to raise capital when
needed or on acceptable terms, we could be forced to delay, reduce or eliminate
our research and development programs or future commercialization efforts.

Based on our current operating plan, we expect that our existing cash and cash
equivalents and marketable securities will be sufficient to enable us to fund
our operating expenses and capital expenditure requirements through 2025. We
have based this estimate on assumptions that may prove to be wrong, and we may
use our available capital resources sooner than we currently expect. Our future
capital requirements will depend on many factors, including:

•the scope, progress, results and costs of discovery, nonclinical development,
laboratory testing and clinical trials for other potential product candidates we
may develop, if any;

•the costs, timing and outcome of regulatory review of ACU193 or any future product candidates;

•our ability to establish and maintain collaborations on favorable terms, if at all;

•the achievement of milestones or occurrence of other developments that trigger payments under any collaboration agreements we might have at such time;

•the costs and timing of future commercialization activities, including product sales, marketing, manufacturing and distribution, for ACU193 or any future product candidates for which we receive marketing approval;

•the amount of revenue, if any, received from commercial sales of ACU193 or any future product candidates, should any of our product candidates receive marketing approval;

•the costs of preparing, filing and prosecuting patent applications, obtaining, maintaining and enforcing our intellectual property rights and defending intellectual property-related claims;

•our headcount growth and associated costs as we expand our business operations and our research and development activities; and

•the costs of operating as a public company.


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Until such time, if ever, as we can generate substantial product revenue, we
expect to finance our longer-term cash needs through a combination of equity
offerings, debt financings, collaborations, strategic alliances and licensing
arrangements. To the extent that we raise additional capital through the sale of
equity or convertible debt securities, ownership interests may be diluted, and
the terms of these securities may include liquidation or other preferences that
could adversely affect the rights of our common stockholders. Any debt
financing, if available, may involve agreements that include restrictive
covenants that limit our ability to take specific actions, such as incurring
additional debt, making capital expenditures or declaring dividends, that could
adversely impact our ability to conduct our business.

If we raise funds through collaborations, strategic alliances or licensing
arrangements with third parties, we may have to relinquish valuable rights to
our technologies, future revenue streams, research programs or product
candidates or to grant licenses on terms that may not be favorable to us. If we
are unable to raise additional funds through equity or debt financings when
needed, we may be required to delay, limit, reduce or terminate our product
development or future commercialization efforts or grant rights to develop and
market product candidates that we would otherwise prefer to develop and market
ourselves.

Critical Accounting Policies, Significant Judgments and Use of Estimates



The preparation of financial statements in conformity with U.S. generally
accepted accounting principles, or U.S. GAAP, requires management 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 financial statements and the reported amounts of expenses incurred during
the reporting periods. Our estimates and assumptions 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. We believe that the accounting policies discussed below are critical
to understanding our historical and future performance, as these policies relate
to the more significant areas involving management's judgments and estimates.

While our significant accounting policies are described in the notes to our
financial statements included elsewhere in this Annual Report for Form 10-K, we
believe that the following critical accounting policies are most important to
understanding and evaluating our reported financial results.

Stock-Based Compensation Expense



We recognize stock-based compensation expense for all stock-based awards.
Stock-based compensation costs are estimated at the grant date based on the fair
value of the equity and recognized as expense, net of actual forfeitures when
they occur, on a straight-line basis over the requisite service period.

We calculate the fair value of options using the Black-Scholes option-pricing model, which requires the use of various highly subjective assumptions as follows:

•Fair Value of Common Stock-See the subsection titled "Common Stock Valuations" below.



•Expected Term-We have opted to use the "simplified method" for estimating the
expected term of options, whereby the expected term equals the arithmetic
average of the mid-point between the vesting date and the end of contractual
term of the option (generally ten years).

•Expected Volatility-Due to our limited operating history and a lack of
sufficient company-specific historical and implied volatility data, we have
based our estimate of expected volatility on the historical volatility of a
group of industry peers that are publicly traded. We will continue to utilize a
group of publicly traded peers to estimate volatility until a sufficient amount
of historical information regarding the volatility of our own stock becomes
available.

•Risk-Free Interest Rate-The risk-free rate assumption is based on the U.S.
Treasury yield in effect at the time of the grant with maturities consistent
with the expected term of our options.

•Expected Dividend Yield-We have not issued any dividends in our history and do
not expect to pay dividends on our common stock over the life of the options and
therefore have estimated the dividend yield to be zero.
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We will continue to use judgment in evaluating the expected volatility, expected terms and interest rates utilized for our stock-based compensation expense calculations on a prospective basis.



For the years ended December 31, 2022 and 2021, stock-based compensation expense
was $3.1 million and $0.9 million, respectively. As of December 31, 2022, we had
approximately $8.9 million of total unrecognized stock-based compensation costs,
which we expect to recognize over an estimated weighted-average period of 2.6
years. We expect to continue to grant options and other stock-based awards in
the future, and to the extent that we do, our stock-based compensation expense
recognized in future periods will likely increase.

Common Stock Valuations



Given the absence of a public trading market for our common stock prior to the
IPO, and in accordance with the American Institute of Certified Public
Accountants Practice Guide, Valuation of Privately Held Company Equity
Securities Issued as Compensation, or the Practice Aid, our board of directors
exercised reasonable judgment and considered numerous and subjective factors to
determine the best estimate of fair value of our common stock prior to the IPO,
including, but not limited to:

•relevant precedent transactions involving our capital stock;

•contemporaneous valuations of our common stock performed by third-party specialists;

•rights, preferences, and privileges of our redeemable convertible preferred stock relative to those of our common stock;

•our business, financial condition and results of operations, including related industry trends affecting our operations;

•likelihood of achieving a liquidity event, such as an initial public offering or a sale of our business;

•the lack of marketability of our common stock, and the illiquidity of stock-based awards involving securities in a private company;

•market multiples of comparable publicly-traded companies; and

•U.S. and global capital and macroeconomic conditions.



The Practice Aid identifies various available methods for allocating enterprise
value across classes and series of capital stock to determine the estimated fair
value of common stock at each valuation date. In accordance with the Practice
Aid, we considered the following methods:

•Option Pricing Method, or OPM. Under the OPM, shares are valued by creating a
series of call options with exercise prices based on the liquidation preferences
and conversion terms of each equity class. The estimated fair values of the
preferred and common stock are inferred by analyzing these options. This method
is appropriate to use when the range of possible future outcomes is so difficult
to predict that estimates would be highly speculative, and dissolution or
liquidation is not imminent.

•Probability-Weighted Expected Return Method, or PWERM. The PWERM is a scenario-based analysis that estimates value per share based on the probability-weighted present value of expected future investment returns, considering each of the possible outcomes available to us, as well as the economic and control rights of each share class.



For valuations performed during fiscal years 2018 through 2020 we used the OPM.
For valuations performed beginning in 2021, prior to the IPO, in accordance with
the Practice Aid, we used a hybrid approach of the OPM and the PWERM methods to
determine the estimated fair value of our common stock as a result of the
increasing likelihood of the occurrence of certain discrete events, such as a
potential IPO, improving market conditions and receptivity of the market to
initial public offerings. The enterprise value determined under the OPM and
PWERM methods was weighted according to our board of directors' estimate of the
probability of the occurrence of a certain discrete event as of the valuation
date. The resulting equity value for the common stock was then divided by the
number of shares of common stock outstanding at the date of the valuation to
derive a per share value on a non-marketable basis. In order to determine the
fair value of our common stock on a marketable basis, we then applied a discount
for lack of marketability which we derived based on inputs including a
company-specific volatility rate, a term equal to the expected time to a future
liquidity event and a risk-free rate equal to the yield on treasuries of similar
duration.
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Application of these approaches involves the use of estimates, judgment and
assumptions that are highly complex and subjective, such as those regarding our
expected future revenue, expenses, cash flows, discount rates, market multiples,
the selection of comparable companies and the probability of future events.
Changes in any or all of these estimates and assumptions, or the relationships
between those assumptions, impact our valuations as of each valuation date and
may have a material impact on the valuation of common stock. The assumptions
underlying these valuations represent our management's best estimate, which
involve inherent uncertainties and the application of management judgment. As a
result, if factors or expected outcomes change and we use significantly
different assumptions or estimates, our stock-based compensation expense could
be materially different.

Following the closing of the initial public offering, the fair value of our common stock has been determined based on the quoted market price of our common stock.

Accrued Research and Development Expenses



As part of the process of preparing our financial statements, we are required to
estimate our accrued expenses as of each balance sheet date. This process
involves reviewing open contracts and purchase orders, identifying services that
have been performed on our behalf and estimating the level of service performed
and the associated cost incurred for the service when we have not yet been
invoiced or otherwise notified of the actual cost. We make estimates of our
accrued expenses as of each balance sheet date based on facts and circumstances
known to us at that time. We periodically confirm the accuracy of our estimates
with the service providers and make adjustments if necessary. The significant
estimates in our accrued research and development expenses include the costs
incurred for services performed by our vendors in connection with research and
development activities for which we have not yet been invoiced. Since our
inception, we have not experienced any material differences between accrued or
prepaid costs and actual costs.

We base our expenses related to research and development activities on our
estimates of the services received and efforts expended pursuant to quotes and
contracts with vendors that conduct research and development on our behalf. The
financial terms of these agreements are subject to negotiation, vary from
contract to contract and may result in uneven payment flows. There may be
instances in which payments made to our vendors will exceed the level of
services provided and result in a prepayment of the research and development
expense. In accruing service fees, we estimate the time period over which
services will be performed and the level of effort to be expended in each
period. If the actual timing of the performance of services or the level of
effort varies from our estimate, we adjust the accrual or prepaid expense
accordingly. Advance payments for goods and services that will be used in future
research and development activities are expensed when the activity has been
performed or when the goods have been received rather than when the payment is
made.

Clinical trial costs are a significant component of accrued research and
development expenses and include costs associated with third-party contractors.
We accrue and expense costs for clinical trial activities performed by third
parties based upon the work completed to date for each clinical trial in
accordance with established agreements. Management determines costs through
discussions with internal clinical stakeholders and outside service providers as
to the progress or stage of completion of clinical trials or services and the
contracted fee to be paid for such services. In the event advance payments are
made to an outside service provider, the payments are recorded within prepaid
expenses and other current assets on the Balance Sheet and subsequently
recognized as research and development expense in the Statement of Operations
when the associated services have been performed. As actual costs become known,
we adjust our estimates, liabilities and assets. Inputs used in the
determination of estimates discussed above may vary from actual, which will
result in adjustments to research and development expense in future periods.

Accrued research and development expenses, including accrued clinical trial
expenses, increased to $3.9 million as of December 31, 2022, compared with $2.6
million as of December 31, 2021, and prepaid research and development expenses
decreased to $1.1 million as of December 31, 2022, compared with $2.6 million as
of December 31, 2021.

Emerging Growth Company and Smaller Reporting Company Status



In April 2012, the Jumpstart Our Business Startups Act of 2012, or JOBS Act, was
enacted. Section 107 of the JOBS Act provides that an "emerging growth company"
can take advantage of the extended transition period provided in Section
7(a)(2)(B) of the Securities Act of 1933, as amended, for complying with new or
revised accounting standards. Thus, an emerging growth company can delay the
adoption of certain accounting standards until those standards would otherwise
apply to private companies. We elected the extended transition period for
complying with new or revised accounting standards, which delays the adoption of
these accounting standards until they would apply to private companies.
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In addition, as an emerging growth company, we may take advantage of specified reduced disclosure and other requirements that are otherwise applicable generally to public companies. These provisions include:

•an exception from compliance with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, as amended;

•reduced disclosure about our executive compensation arrangements in our periodic reports, proxy statements and registration statements;

•exemptions from the requirements of holding non-binding advisory votes on executive compensation or golden parachute arrangements; and

•an exemption from compliance with the requirements of the Public Company Accounting Oversight Board regarding the communication of critical audit matters in the auditor's report on financial statements.



We may take advantage of these provisions until we no longer qualify as an
emerging growth company. We will cease to qualify as an emerging growth company
on the date that is the earliest of: (i) December 31, 2025, (ii) the last day of
the fiscal year in which we have more than $1.235 billion in total annual gross
revenues, (iii) the date on which we are deemed to be a "large accelerated
filer" under the rules of the SEC, which means the market value of our common
stock that is held by non-affiliates exceeds $700 million as of the prior June
30th, or (iv) the date on which we have issued more than $1.0 billion of
non-convertible debt over the prior three-year period. We may choose to take
advantage of some but not all of these reduced reporting burdens. We have taken
advantage of certain reduced reporting requirements in this Annual Report on
Form 10-K and our other filings with the SEC. Accordingly, the information
contained herein may be different than you might obtain from other public
companies in which you hold equity interests.

We are also a "smaller reporting company," meaning that the market value of our
shares held by non-affiliates is less than $700 million and our annual revenue
was less than $100 million during the most recently completed fiscal year. We
may continue to be a smaller reporting company if either (i) the market value of
our shares held by non-affiliates is less than $250 million or (ii) our annual
revenue was less than $100 million during the most recently completed fiscal
year and the market value of our shares held by non-affiliates is less than $700
million. If we are a smaller reporting company at the time we cease to be an
emerging growth company, we may continue to rely on exemptions from certain
disclosure requirements that are available to smaller reporting companies.
Specifically, as a smaller reporting company, we may choose to present only the
two most recent fiscal years of audited financial statements in our Annual
Report on Form 10-K and, similar to emerging growth companies, smaller reporting
companies have reduced disclosure obligations regarding executive compensation.

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