You should read the following discussion and analysis of our financial condition and results of operations together with our financial statements and related notes included elsewhere in this Annual Report on Form 10-K. This discussion and other parts of this Annual Report on Form 10-K contain forward-looking statements that involve risks and uncertainties, such as our plans, objectives, expectations, intentions and beliefs. Our actual results could differ materially from those discussed in these forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those identified below and those discussed in the section entitled "Risk Factors" included elsewhere in this Annual Report on Form 10-K.

Overview

We are a clinical-stage biopharmaceutical company focused on the discovery, development, and commercialization of novel, proprietary, synthetic small molecules for the treatment of nervous system disorders. We have focused our efforts on targeting and modulating N-methyl-D-aspartate receptors, or NMDArs, which are vital to normal and effective function of the brain and nervous system. We believe leveraging the therapeutic advantages of the differentiated modulatory mechanism of our compounds could drive a paradigm shift in the treatment of disorders of the brain and nervous system.

Our lead compound, NYX-783 is in Phase 1 clinical development for the treatment of opioid use disorder, or OUD. The development of NYX-783 in OUD is being supported by a grant from the National Institutes of Health and National Institute on Drug Abuse. The Phase 1 study is being conducted by researchers at Yale University School of Medicine. In preclinical studies, NYX-783 has also demonstrated therapeutic potential in treating alcohol use disorder, or AUD.

Previously, we also sought to develop compounds for the treatment of post-traumatic stress disorder (NYX-783), cognitive impairment associated with Parkinson's disease and dementia with Lewy bodies (NYX-458) and chronic pain (NYX-2925).

In August 2022, we announced that we were discontinuing the development of NYX-2925 after two Phase 2b studies in chronic pain failed to demonstrate sufficent efficacy to support continued investment by Aptinyx.

In February 2023, we discontinued the development of NYX-458 in cognitive impairment associated with Parkinson's disease and dementia with Lewy bodies, following results from an exploratory Phase 2 clinical study which did not demonstrate clinically meaningful improvements by NYX-458 over placebo on the study's efficacy endpoints.

In March 2023, we discontinued the development of NYX-783 in PTSD following the early termination of the study and analysis of the available data from the first 100 patients enrolled in the study. In the analysis, NYX-783 did not demonstrate sufficient improvement on the study's primary endpoint to support continued development of the program by Aptinyx.



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                           [[Image Removed: Graphic]]

In March 2023, we engaged Ladenburg Thalmann & Co. as our exclusive financial advisor to assist in the process of exploring strategic alternatives to maximize shareholder value. No timetable has been established for the completion of this process, and the we do not expect to disclose developments unless and until the board of directors has concluded that disclosure is appropriate or required.

In March 2023, we also began implementation of a strategic restructuring with the objective of preserving capital. Our board of directors approved a restructuring plan following a review of our operations, cost structure, and growth opportunities. The restructuring included a reduction in headcount of approximately 60% across the Company. We recorded a charge of approximately $1.4 million in the first quarter of 2022 as a result of the restructuring, which consisted of one-time termination benefits for employee severance, benefits and related costs, all of which are expected to result in cash expenditures and substantially all of which will be paid out by the first quarter of 2023.

Since our inception in June 2015, we have never generated revenue from the sale of our products and have incurred significant net losses. Our nominal revenues to date have been primarily derived from a research collaboration agreement with Allergan plc, or Allergan, a development services agreement with Allergan, and research and development grants from the U.S. government. While these revenues have offset a small portion of the costs associated with our early stage research and discovery efforts, we do not rely on these revenues to fund our operations. Our research collaboration and development services agreements with Allergan have passed their contractual conclusions and we do not expect to receive any further revenues from these collaborations.

As of December 31 2022, we had cash and cash equivalents of $56.2 million. We have identified conditions and events which raise substantial doubt about our ability to continue as a going concern. See "Liquidity, capital resources, and going concern" within footnote one to the financial statements.

We do not expect to generate revenue from product sales unless and until we successfully complete clinical development and obtain regulatory approval for a product candidate, which we expect will take a number of years and the outcome of which is uncertain, or enter into collaborative agreements with third parties, the timing of which is largely beyond our control and may never occur. To fund our current and future operating plans, we will need additional capital, which we may obtain through one or more equity offerings, debt financings, or other third-party funding, including potential strategic alliances and licensing or collaboration arrangements. We may, however, be unable to raise additional funds or enter into such other arrangements when needed on favorable terms or at all. Our failure to raise capital or enter into such other arrangements as and when needed would have a negative impact on our financial condition and our ability to develop our current product candidates, or any additional product candidates, if developed. The amount and timing of our future funding requirements will depend on many factors, including our ability to timely and successfully enroll subjects in the clinical studies of our compounds and the pace and results of our preclinical and clinical development efforts. We cannot assure you that we will ever be profitable or generate positive cash flow from operating activities.



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Financial operations overview

Revenues

We have not generated any revenue from product sales. We are unable to predict when, if ever, material net cash inflows will commence from sales any products we may develop, if approved. Our revenue to date has been primarily derived from a research collaboration agreement with Allergan (now a subsidiary of AbbVie), under which the jointly funded research activities and option exercise period, including the associated payments by Allergan, came to their contractual conclusion in August 2020 and February 2021, respectively; a development services agreement with Allergan, which was put in place to continue certain development activities for a pre-determined short period of time following Allergan's acquisition of Naurex Inc. in 2015; and research and development grants from the U.S. government that have no repayment or royalty obligations and none of which are currently outstanding.

Operating expenses

Research and development expenses

Research and development activities account for a significant portion of our operating expenses. We expense research and development costs as incurred. Research and development expenses consist of costs incurred in connection with the development of our product candidates, including:

fees paid to consultants, sponsored researchers, contract manufacturing

organizations, or CMOs, and contract research organizations, or CROs, including

? in connection with our preclinical and clinical studies, and other related

clinical study fees, such as for investigator grants, patient screening,

laboratory work, clinical study database management, and statistical

compilation and analysis;

? costs related to acquiring and maintaining preclinical and clinical study

materials and facilities;

? costs related to compliance with regulatory requirements; and

? costs related to salaries, bonuses, and other compensation, including

stock-based compensation, for employees in research and development functions.

At this time, we cannot reasonably estimate or know the nature, timing, and costs of the efforts that will be necessary to complete the development of our product candidates. This is due to the numerous risks and uncertainties associated with developing such product candidates, including the uncertainty related to:



 ? the impacts of COVID-19;


? future clinical study results;

? the scope, rate of progress, and expense of any preclinical studies, clinical

studies and other research and development activities;

? clinical study enrollment rate or design;

? the manufacturing of our product candidates;

? our ability to obtain and maintain intellectual property protection for our

product candidates;

? significant and changing government regulation;




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establishing commercial manufacturing capabilities or making arrangements with

? third-party manufacturers, developing and timely delivery of commercial-grade

drug formulations that can be used in our clinical trials and for commercial

launch;

? the timing and receipt of regulatory approvals, if any; and

? the risks disclosed in the section entitled "Risk Factors" in this Annual

Report.

A change in the outcome of any of these variables with respect to the development of any of our product candidates could significantly change the costs, timing, and viability associated with the development of that product candidate.

We expect our research and development expenses to increase over the next several years as we continue to implement our business strategy, which includes advancing our product candidates into and through clinical development, expanding our research and development efforts, seeking regulatory approvals for any product candidates for which we successfully complete clinical studies, accessing and developing additional product candidates, and 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 studies. As such, we expect our research and development expenses to increase as our product candidates advance into later stages of clinical development.

General and administrative expenses

General and administrative expenses consist primarily of salaries and related costs, including stock-based compensation. General and administrative expenses also include rent as well as professional fees for legal, consulting, accounting, and audit services.

Other income (expense), net and interest expense

Other income (expense), net and interest expense consists primarily of the interest income earned on our cash and cash equivalents and interest expense on our Loan Agreement, as well as changes in fair value of the derivative liability associated with our obligation to issue additional warrants in connection with subsequent draws under our Loan Agreement.

Results of operations

Comparison of 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,        Increase
                                         2022          2021     (Decrease)
Collaboration revenue              $        -    $    1,000    $   (1,000)
Operating expenses:
Research and development               42,748        55,444       (12,696)
General and administrative             19,819        20,090          (271)
Total operating expenses               62,567        75,534       (12,967)
Loss from operations                 (62,567)      (74,534)       (11,967)
Other (income) expense, net             (737)         (160)            577
Interest expense                        3,019           512          2,507

Net loss and comprehensive loss $ (64,849) $ (74,886) $ (10,037)




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Collaboration revenue

Collaboration revenue was $0.0 million for the year ended December 31, 2022, compared to $1.0 million for the year ended December 31, 2021. Collaboration revenue in 2021 was attributable to the research collaboration with Allergan. The decrease in 2022 is attributed to the option exercise period under the research collaboration and the associated payments by Allergan coming to its contractual conclusion in February 2021.

Research and development expenses

The following table summarizes our research and development expenses incurred during the years ended December 31, 2022 and 2021 (in thousands):



                                                                  Year
                                                   ended December 31,        Increase
                                                      2022        2021     (Decrease)
NYX-2925                                       $    10,355    $ 31,500    $  (21,145)
NYX-783                                             14,354       4,892          9,462
NYX-458                                              7,072       5,886          1,186

Preclinical research and discovery programs 2,856 3,063 (207) Personnel and related costs

                          8,111      10,103        (1,992)

Total research and development expenses $ 42,748 $ 55,444 $ (12,696)

Research and development expenses were $42.7 million for the year ended December 31, 2022, compared to $55.4 million for the year ended December 31, 2021. The decrease of $12.7 million was primarily due to the following:

a decrease of approximately $21.1 million related to the completion of

? enrollment in our Phase 2b clinical trials in patients with painful DPN and in

patients with fibromyalgia in October 2021 and February 2022, respectively;

a decrease of approximately $2.0 million due to employee compensation and

? related support costs associated with reduction in headcount and lower grant

date fair values for equity awards;

an increase of approximately $9.4 million in clinical, regulatory, and drug

? product costs related to the conduct of Phase 2b development of NYX-783 in

patients with PTSD; and

an increase of approximately $1.2 million related to our Phase 2 study of

? NYX-458 in patients with cognitive impairment associated with Parkinson's

disease and dementia with Lewy bodies.

General and administrative expenses

General and administrative expenses were $19.8 million for the year ended December 31, 2022, compared to $20.1 million for the year ended December 31, 2021.

Other income (expense), net

We recorded $0.7 million and $0.2 million of other income for the years ended December 31, 2022 and 2021, respectively. This change was primarily driven by a change in fair value of the derivative liability.

Interest expense

Interest expense was $3.0 million for the year ended December 31, 2022, compared to $0.5 million for the year ended December 31, 2022. This increase was driven by the average balances outstanding under our Loan Agreement, which we entered into on September 15, 2021, coupled with an increase in the applicable interest rates during 2022.



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Liquidity and capital resources

From our inception through December 31, 2022, we have incurred significant operating losses and have funded our operations to date through proceeds from collaborations, grants, sales of convertible preferred stock, IPO and follow-on public offerings, our ATM Offerings, and our debt financing. We have generated limited revenue to date from a research collaboration agreement with Allergan, a development services agreement with Allergan, and research and development grants from the U.S. government. The jointly funded research activities and option exercise period under the research collaboration agreement with Allergan, as well as associated payments by Allergan to us, came to their contractual conclusion in August 2020 and February 2021, respectively.

On June 25, 2018, we completed our IPO, pursuant to which we issued and sold 7,359,998 shares of our common stock at a price of $16.00 per share, which included 959,999 shares sold pursuant to the exercise of the underwriters' option to purchase additional shares. We received $106.5 million of proceeds, net of underwriting discounts and commissions and other offering expenses.

On July 1, 2019, we entered into a Sales Agreement (the "2019 Sales Agreement") with Cowen and Company, LLC ("Cowen") pursuant to which we may offer and sell shares of our common stock with an aggregate offering price of up to $24.0 million under an "at the market" offering program (the "2019 ATM Offering"). The 2019 Sales Agreement provides that Cowen will be entitled to a sales commission equal to 3.0% of the gross sales price per share of all shares sold under the 2019 ATM Offering. To date, we have sold an aggregate of 5,120,940 shares under the 2019 ATM Offering at a weighted-average price of $3.99 per share for net proceeds of $20.4 million after deducting sales commission and other offering expenses, including 3,629,458 shares for net proceeds of $14.5 million during the year ended December 31, 2021.

On September 16, 2021, we entered into a Sales Agreement (the "2021 Sales Agreement") with Cowen pursuant to which we may offer and sell shares of our common stock with an aggregate offering price of up to $50.0 million under an "at the market" offering program (the "2021 ATM Offering") and which supersedes the 2019 Sales Agreement and 2019 ATM Offering. The 2021 Sales Agreement provides that Cowen will be entitled to a sales commission equal to 3.0% of the gross sales price per share of all shares sold under the 2021 ATM Offering. To date, no shares of common stock have been issued and sold pursuant to the 2021 Sales Agreement.

On January 14, 2020, we completed a follow-on public offering of our common stock pursuant to an effective registration statement on Form S-3. We sold an aggregate of 11,691,666 shares of common stock, which included the exercise in full of the underwriters' option to purchase additional shares, at a public offering price of $3.00 per share. Net proceeds from the offering were approximately $33.3 million after deducting underwriting discounts and commissions as well as other offering expenses.

On October 26, 2020, we completed a follow-on public offering of our common stock pursuant to an effective registration statement on Form S-3. We sold an aggregate of 16,100,000 shares of common stock, which included the exercise in full of the underwriters' option to purchase additional shares, at a public offering price of $3.00 per share. Net proceeds from the offering were approximately $45.1 million after deducting underwriting discounts and commissions as well as estimated offering expenses.

On September 15, 2021, we entered into a loan and security agreement with K2 HealthVentures LLC, or Loan Agreement. The Loan Agreement provides up to $50.0 million principal in term loans, $15.0 million of which was funded at the time we entered into the Loan Agreement and $10.0 million of which was funded in March 2022. Interest on the outstanding loan balance will accrue at a variable rate equal to the greater of (i) 7.95% and (ii) the prime rate as published in the Wall Street Journal, plus 4.70%. We are required to make monthly interest-only payments through September 2023. If we elect to draw the third tranche, the interest-only period is extended through October 2024. Subsequent to the interest-only period, we are required to make equal monthly principal payments plus any accrued interest until the loans mature in September 2025. Upon final payment or prepayment of the loans, we are required to pay a final payment equal to 6.45% of the loans borrowed. We have the option to prepay the loans in whole, subject to a



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prepayment fee of 3% if the payment occurs on or before 24 months after the initial funding date, 2% if the prepayment occurs more than 24 months after, but on or before 36 months after the initial funding date, or 1% if the prepayment occurs more than 36 months after the initial funding date. We are obligated to pay a loan origination fee of 0.8% of each term loan that is funded under the Loan Agreement. The Loan Agreement also restricts certain activities, such as disposing of our business or certain assets, incurring additional debt or liens or making payments on other debt, making certain investments and declaring dividends, acquiring or merging with another entity, engaging in transactions with affiliates or encumbering intellectual property, among others.

As of December 31, 2022, we had cash and cash equivalents of $56.2 million. We invest our cash equivalents in liquid money market accounts.

Funding requirements

Our primary uses of capital are, and we expect will continue to be, research and development services, compensation and related expenses, laboratory and related supplies, legal and other regulatory expenses, patent prosecution filing and maintenance costs for our licensed intellectual property and general overhead costs. We expect to continue to incur significant expenses and operating losses for the foreseeable future. In addition, since the closing of our IPO, we have incurred, and expect to incur, additional costs associated with operating as a public company. We anticipate that our expenses will increase significantly in connection with our ongoing activities, as we:

? seek to address and recover from impacts of COVID-19;

? advance the clinical development of our lead product candidates;

? continue to improve the manufacturing process for our product candidates; and

manufacture clinical supplies as our development progresses;

? continue the research and development of our preclinical product candidates;

? seek to identify and develop additional product candidates;

? maintain, expand, and protect our intellectual property portfolio; and

? improve our operational, financial, and management systems to support our

clinical development and other operations.

Outlook

We are not able to advance our studies or perform meaningful research or development without obtaining additional sources of financing. These conditions and events raise substantial doubt about our ability to continue as a going concern.

We do not expect to generate revenue from product sales unless and until we successfully complete clinical development and obtain regulatory approval for a product candidate, which we expect will take a number of years and the outcome of which is uncertain, or enter into collaborative agreements with third parties, the timing of which is largely beyond our control and may never occur. To fund our current and future operating plans, we will need additional capital, which we may obtain through one or more equity offerings, debt financings, or other third-party funding, including potential strategic alliances and licensing or collaboration arrangements. We may, however, be unable to raise additional funds or enter into such other arrangements when needed on favorable terms or at all, including as a result of COVID-19. Our failure to raise capital or enter into such other arrangements as and when needed would have a negative impact on our financial condition and our ability to develop our current product candidates, or any additional product candidates, if developed. The amount and timing of our future funding requirements will depend on many factors, including the effects of COVID-19, our ability to successfully enroll subjects in a timely way for the clinical studies and the pace and results



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of our preclinical and clinical development efforts. We cannot assure you that we will ever be profitable or generate positive cash flow from operating activities.

Cash flows

The following table summarizes our sources and uses of cash for each of the periods presented (in thousands):



                                                                             Year ended
                                                                          December 31,
                                                                     2022          2021
Net cash provided by (used in):
Operating activities                                           $ (59,684)    $ (63,425)
Investing activities                                                    -           121
Financing activities                                                9,747        28,326

Net decrease in cash, cash equivalents and restricted cash $ (49,937) $ (34,978)

Operating activities

For the year ended December 31, 2022, compared to the same period in 2021, the $3.7 million decrease in net cash used in operating activities was primarily due to a $10.0 million decrease in our net loss year over year, driven mostly by lower research and development expenses, offset by a decrease in the use of cash of $4.8 million due to changes in working capital largely driven by timing of cash paid to support our clinical research programs, and also offset by a decrease in non-cash stock based compensation of $1.5 million.

Investing activities

For the year ended December 31, 2022, compared to the same period in 2021, the $0.1 million decrease in net cash provided by investing activities was primarily due to proceeds from disposal of laboratory equipment in 2021.

Financing activities

For the year ended December 31, 2022, compared to the same period in 2021, the $18.6 million decrease in net cash provided by financing activities was primarily due to $14.6 million of net proceeds received from our at the market offering in the 2021 period, $14.6 million of net proceeds received from our Loan Agreement in the 2021 period, and $0.9 million repurchase of shares for tax withholding obligations associated with restricted stock units in the 2021 period, compared to $10.0 million of net proceeds received from our Loan Agreement in the 2022 period and offering costs of $0.2 million.

Critical accounting policies and significant judgments and estimates

We prepare our financial statements in accordance with generally accepted accounting principles in the United States, or U.S. GAAP. In the preparation of these financial statements, we are required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, costs and expenses, and related disclosures. To the extent that there are material differences between these estimates and actual results, our financial condition or operating results would be affected. We base our estimates on past experience and other assumptions that we believe are reasonable under the circumstances, and we evaluate these estimates on an ongoing basis.

While our significant accounting policies are described in more detail in the notes to our financial statements appearing in this Annual Report on Form 10-K, we believe the following accounting policies are those most critical to the judgments and estimates used in the preparation of our financial statements.



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Research and development

As part of the process of preparing our financial statements, we are required to estimate certain of our accrued research and development expenses. This process involves reviewing open contracts and purchase orders, communicating with our personnel to identify services that have been performed on our behalf, and estimating the level of service performed and the associated costs incurred for the services when we have not yet been invoiced or otherwise notified of the actual costs. The majority of our service providers invoice us in arrears for services performed, on a pre-determined schedule or when contractual milestones are met; however, some require advanced payments. We make estimates of our accrued expenses as of each balance sheet date in our financial statements based on facts and circumstances known to us at that time. Examples of estimated accrued research and development expenses include fees paid to:

? CROs in connection with performing research and development services on our

behalf;

? investigative sites or other providers in connection with clinical studies;

? vendors in connection with preclinical development activities; and

? vendors related to product manufacturing, development, and distribution of

clinical supplies.

We base our expenses related to clinical studies on our estimates of the services received and efforts expended pursuant to contracts with multiple CROs that conduct and manage clinical studies 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 clinical expense. Payments under some of these contracts depend on factors such as the successful enrollment of patients and the completion of clinical study milestones. In accruing service fees, we estimate the time period over which services will be performed, enrollment of patients, number of sites activated and 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 amount of prepaid expenses accordingly. Although we do not expect our estimates to be materially different from amounts actually incurred, our understanding of the status and timing of services performed relative to the actual status and timing of services performed may vary and may result in us reporting expenses that are too high or too low in any particular period. To date, we have not made any material adjustments to our prior estimates of accrued or prepaid research and development expenses.

Stock-based compensation

We measure stock-based awards granted to our directors and employees at fair value on the date of grant and recognize the corresponding compensation expense of those awards over the requisite service period, which is generally the vesting period of the respective award. Generally, we issue stock options and restricted stock with only service-based vesting conditions and record the expense for these awards using the straight-line method. We have historically granted stock options with exercise prices equivalent to the fair value of our common stock as of the date of grant.

The fair value of our common stock is determined based on the quoted market price of our common stock. Prior to our IPO, the estimates in determining our stock-based compensation valuations were highly complex and subjective, and since our stock was not publicly traded, our board of directors estimated the fair value of our common stock at various dates, with input from management, considering our then most recently available third-party valuations of common stock and its assessment of additional objective and subjective factors that it believed were relevant and which may have changed from the date of the most recent valuation through the date of the grant. The grant date fair value of our options is determined using the Black-Scholes option-pricing model. The expected volatility for our options granted is based on a weighted-average of the historical volatility of share values of publicly traded companies within the biotechnology industry which includes the historical volatility of our stock since the IPO. The expected term of our options has been determined utilizing the "simplified method" for awards that qualify as "plain-vanilla" options. The risk-free interest rate is determined by reference to the U.S. Treasury yield curve in effect at the time of grant of the award for time periods



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approximately equal to the expected term of the award. Expected dividend yield is based on the fact that we have never paid cash dividends and do not expect to pay any cash dividends in the foreseeable future.

JOBS Act

Under Section 107(b) of the Jumpstart Our Business Startups Act of 2012, or the JOBS Act, an "emerging growth company" can delay the adoption of new or revised accounting standards until such time as those standards would apply to private companies. We intend to avail of this exemption. There are other exemptions and reduced reporting requirements provided by the JOBS Act that we are currently evaluating. For example, as an "emerging growth company," we are exempt from Sections 14A(a) and (b) of the Exchange Act which would otherwise require us to (1) submit certain executive compensation matters to shareholder advisory votes, such as "say-on-pay," "say-on-frequency," and "golden parachutes;" and (2) disclose certain executive compensation related items such as the correlation between executive compensation and performance and comparisons of our chief executive officer's compensation to our median employee compensation. We also intend to avail of an exemption from the rule requiring us to provide an auditor's attestation report on our internal controls over financial reporting pursuant to Section 404(b) of the Sarbanes-Oxley Act. We will continue to remain an "emerging growth company" until the earliest of the following: (1) December 31, 2023; (2) the last day of the fiscal year in which our total annual gross revenue is equal to or more than $1.235 billion; (3) the date on which we have issued more than $1 billion in nonconvertible debt during the previous three years; or (4) the date on which we are deemed to be a large accelerated filer under the rules of the SEC.

Recent accounting pronouncements

See Note 2 to our financial statements appearing in this Annual Report on Form 10-K for a full description of recent accounting pronouncements including the respective expected dates of adoption and estimated effects, if any, on our financial statements.

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