Regulatory Reviews of Aficamten for Obstructive HCM Progressing in U.S., E.U. and China; Late-Cycle Meeting with U.S. FDA Scheduled for September Ahead of December 26, 2025 PDUFA Date Primary Results from MAPLE-HCM to be Presented in a Hot Line Session at the European Society of Cardiology Congress 2025 ~$1.0 Billion in Cash, Cash Equivalents and Investments as of June 30, 2025 SOUTH SAN FRANCISCO, Calif., Aug. 07, 2025 (GLOBE NEWSWIRE) — Cytokinetics, Incorporated (Nasdaq: CYTK) reported a management update and financial results for the second quarter of 2025. “Following solid progress in the first half of the year, we are looking forward to several key corporate milestones. Our primary focus remains on preparations for the potential FDA approval of aficamten in late December and subsequent commercial launch in early 2026,” said Robert I. Blum, Cytokinetics’ President and Chief Executive Officer. “Additionally, we are pleased to be sharing results from MAPLE-HCM later this month, which we believe will provide important information related to the standard-of-care in obstructive HCM. With our current balance sheet and additional access to capital, we are well-positioned to execute on both the commercialization and potential label expansion opportunities of aficamten while also advancing our later-stage specialty cardiovascular pipeline.” Q2 and Recent Highlights Cardiac Muscle Programs aficamten (cardiac myosin inhibitor) Continued to support the review of the New Drug Application (NDA) for aficamten for the treatment of patients with obstructive hypertrophic cardiomyopathy (HCM) by the U.S. Food and Drug Administration (FDA). With the three-month extension of the Prescription Drug User Fee Act (PDUFA) target action date to December 26, 2025, the late cycle meeting is now scheduled to occur in September.Prepared responses to the Day 120 List of Questions from the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) regarding the Marketing Authorization Application (MAA) for aficamten for the treatment of obstructive HCM; submission on track to meet the clock stop timeline agreed with EMA. We expect a potential EMA decision regarding the MAA in 1H 2026.Completed all Good Clinical Practice (GCP) inspections for applications under review.Continued to support the review of the NDA for aficamten for obstructive HCM by the Center for Drug Evaluation (CDE) in China. Advanced the ongoing clinical trials program for aficamten: Announced positive topline results from MAPLE-HCM (Metoprolol vs Aficamten in Patients with LVOT Obstruction on Exercise Capacity in HCM). The primary results will be presented in a Hot Line Session in August at the European Society of Cardiology Congress 2025.Continued conduct of ACACIA-HCM (Assessment Comparing Aficamten to Placebo on Cardiac Endpoints In Adults with Non-Obstructive HCM), a pivotal Phase 3 clinical trial of aficamten in patients with non-obstructive HCM. We expect to share topline results of the primary cohort (excluding Japan) in 1H 2026. Dosed the first patient in the Japan cohort of ACACIA-HCM. Dosed the first patient in CAMELLIA-HCM, a Phase 3 clinical trial of aficamten in Japanese patients with obstructive HCM. CAMELLIA-HCM is being conducted by Bayer in collaboration with Cytokinetics to support potential marketing authorization in Japan.Continued enrolling patients in CEDAR-HCM (Clinical Evaluation of Dosing with Aficamten to Reduce Obstruction in a Pediatric Population in HCM), a clinical trial of aficamten in a pediatric population with symptomatic obstructive HCM. We expect to complete patient enrollment of the adolescent cohort in 2H 2025. Presented new analyses at the European Society of Cardiology Heart Failure 2025 Congress from SEQUOIA-HCM on the effect of aficamten between patients with mild and moderate-to-severe symptoms, and across geographic regions. Expanded U.S. commercial readiness activities for aficamten including sales force recruitment, final stages of implementing patient support programs and finalization of our promotional launch campaign. Continued payer engagement to educate on the clinical data supportive of aficamten and the clinical and economic burden of HCM.Advanced European commercial readiness activities including hiring key leadership positions in our European headquarters and other EU and UK geographies, preparing Health Technology Assessment (HTA) dossiers and ensuring launch readiness for potential approval in Germany in 1H 2025. Published the following manuscripts: “A Plain Language Summary of the SEQUOIA-HCM Study: Aficamten for Symptomatic Obstructive Hypertrophic Cardiomyopathy” in Future Cardiology“Efficacy of Aficamten in Patients with Obstructive Hypertrophic Cardiomyopathy and Mild Symptoms: Results from the SEQUOIA-HCM Trial” in the European Heart Journal“Associations of Sex on Economic Burden in Patients with Symptomatic Obstructive Hypertrophic Cardiomyopathy: Results from Medical and Pharmacy Claims Data in Frontiers in Cardiovascular Medicine“Aficamten Treatment for Symptomatic Obstructive Hypertrophic Cardiomyopathy: 48-weeks Results From FOREST-HCM” in the Journal of the American College of Cardiology – Heart Failure“Concomitant Aficamten and Disopyramide in Symptomatic Obstructive Hypertrophic Cardiomyopathy” in the Journal of the American College of Cardiology – Heart Failure“Clinical Evaluation of the Effect of Aficamten on QT/QTc Interval in Healthy Participants” in Clinical and Translational Science omecamtiv mecarbil (cardiac myosin activator) Continued conduct of COMET-HF (Confirmation of Omecamtiv Mecarbil Efficacy Trial in Heart Failure), a confirmatory Phase 3 clinical trial of omecamtiv mecarbil in patients with symptomatic heart failure with severely reduced ejection fraction. We expect to continue enrollment through 2025 to enable completion of enrollment in late 2026. ulacamten (CK-4021586, cardiac myosin inhibitor) Received approval from the International Nonproprietary Names (INN) Program of the World Health Organization for ulacamten to be used as the nonproprietary name for CK-4021586.Continued conduct of AMBER-HFpEF (Assessment of CK-586 in a Multi-Center, Blinded Evaluation of Safety and Tolerability Results in HFpEF), a Phase 2 clinical trial of ulacamten in patients with symptomatic heart failure with preserved ejection fraction (HFpEF) with left ventricular ejection fraction (LVEF) ≥ 60%. We expect to complete patient enrollment of the first two cohorts in 2H 2025. Pre-Clinical Development and Ongoing Research Continued pre-clinical development and research activities directed to additional muscle biology focused programs. Second Quarter 2025 Financial Results Cash, Cash Equivalents and Investments As of June 30, 2025, the company had approximately $1.0 billion in cash, cash equivalents and investments compared to $1.1 billion at March 31, 2025. Cash, cash equivalents and investments declined by $52.6 million during the second quarter of 2025. The Company received $75 million in proceeds from the drawing on Tranche 4 of the Royalty Pharma Multi Tranche Term Loan in the second quarter of 2025. Revenues Total revenues for the second quarter of 2025 were $66.8 million compared to $0.2 million for the same period in 2024. Revenues in the second quarter of 2025 included the recognition of $52.4 million related to the Company’s license and collaboration agreement for aficamten in Japan with Bayer, and $11.7 million for the achievement of clinical milestones in the non-obstructive HCM and obstructive HCM trials in Japan. Research and Development (R&D) Expenses R&D expenses for the second quarter of 2025 were $112.6 million, which included $13.5 million of non-cash stock-based compensation expense, compared to $79.6 million for the same period in 2024, which included $11.5 million of non-cash stock-based compensation expense. The increase was primarily due to advancing our clinical trials, higher personnel-related costs, and medical affairs-related activities. General and Administrative (G&A) Expenses G&A expenses for the second quarter of 2025 were $65.7 million, which included $14.0 million of non-cash stock-based compensation expense, compared to $50.8 million for the same period in 2024, which included $13.1 million of non-cash stock-based compensation expense. The increase was primarily due to investments toward commercial readiness and higher personnel-related costs. Net Income (Loss) Net loss for the second quarter of 2025 was $134.4 million, or $(1.12) per share, basic and diluted, compared to a net loss of $143.3 million, or $(1.31) per share, basic and diluted, for the same period in 2024. 2025 Financial Guidance The company is maintaining its full year 2025 financial guidance: GAAP operating expense*$670 million to $710 millionNon-cash stock-based compensation expense included in GAAP operating expense$120 million to $110 million *GAAP operating expense comprised of R&D and SG&A expenses. Anticipated year-over-year increase in GAAP operating expense includes investments toward commercial readiness for the potential approval and launch of aficamten for patients with obstructive HCM. The financial guidance does not include the effect of GAAP adjustments as may be caused by events that occur subsequent to publication of this guidance, including but not limited to Business Development activities. Conference Call and Webcast Information Members of Cytokinetics’ senior management team will review the company’s second quarter 2025 results on a conference call today at 4:30 PM Eastern Time. The conference call will be simultaneously webcast and can be accessed from the Investors & Media section of Cytokinetics’ website at www.cytokinetics.com or directly at the following link: Cytokinetics Q2 2025 Earnings Conference Call. An archived replay of the webcast will be available via Cytokinetics’ website for six months. About Cytokinetics Cytokinetics is a specialty cardiovascular biopharmaceutical company, building on its over 25 years of pioneering scientific innovations in muscle biology to advance a pipeline of potential new medicines for patients suffering from diseases of cardiac muscle dysfunction. Cytokinetics is readying for potential regulatory approvals and commercialization of aficamten, a cardiac myosin inhibitor following positive results from SEQUOIA-HCM, the pivotal Phase 3 clinical trial in patients with obstructive hypertrophic cardiomyopathy (HCM). Aficamten is also being evaluated in additional clinical trials enrolling patients with obstructive and non-obstructive HCM. Cytokinetics is also developing omecamtiv mecarbil, a cardiac myosin activator, in patients with heart failure with severely reduced ejection fraction (HFrEF), ulacamten, a cardiac myosin inhibitor with a mechanism of action distinct from aficamten, for the potential treatment of heart failure with preserved ejection fraction (HFpEF) and CK-089, a fast skeletal muscle troponin activator with potential therapeutic application to a specific type of muscular dystrophy and other conditions of impaired skeletal muscle function. For additional information about Cytokinetics, visit www.cytokinetics.com and follow us on X, LinkedIn, Facebook and YouTube. Forward-Looking Statements This press release contains forward-looking statements for purposes of the Private Securities Litigation Reform Act of 1995 (the “Act”). Cytokinetics claims the protection of the Act’s Safe Harbor for forward-looking statements. Examples of such statements include, but not limited to, statements, express or implied, relating to our or our partners’ research and development and commercial readiness activities, including the initiation, conduct, design, enrollment, progress, continuation, completion, timing and results of any of our clinical trials, or more specifically, our receipt of regulatory approval by FDA or any other regulatory authority to enable our commercialization of aficamten in the United States or any other jurisdiction by the target PDUFA date or any other date, if ever, our ability to complete enrollment of CEDAR-HCM and AMBER-HFpEF in the second half of 2025, our ability to complete patient enrollment of COMET-HF in 2026, our ability to announce the results of ACACIA-HCM in the first half of 2026, our ability to announce the results of any of our clinical trials by any particular date, the timing of interactions with FDA or any other regulatory authorities in connection to any of our drug candidates and the outcomes of such interactions; statements relating to the potential patient population who could benefit from aficamten, omecamtiv mecarbil, CK-586, CK-089 or any of our other drug candidates; statements relating to our ability to receive additional capital or other funding, including, but not limited to, our ability to meet any of the conditions relating to or to otherwise secure additional loan disbursements under any of our agreements with entities affiliated with Royalty Pharma or additional milestone payments from Sanofi or Bayer in connection with our collaborations for aficamten in China or Japan respectively; statements relating to our operating expenses or cash utilization for the remainder of 2025 or any other period, and statements relating to our cash balance at any particular date or the amount of cash runway such cash balances represent at any particular time. Such statements are based on management’s current expectations, but actual results may differ materially due to various risks and uncertainties, including, but not limited to Cytokinetics’ need for additional funding and such additional funding may not be available on acceptable terms, if at all; potential difficulties or delays in the development, testing, regulatory approvals for trial commencement, progression or product sale or manufacturing, or production of Cytokinetics’ drug candidates that could slow or prevent clinical development or product approval; patient enrollment for or conduct of clinical trials may be difficult or delayed; the FDA or foreign regulatory agencies may delay or limit Cytokinetics’ or its partners’ ability to conduct clinical trials; Cytokinetics may incur unanticipated research and development and other costs; standards of care may change, rendering Cytokinetics’ drug candidates obsolete; and competitive products or alternative therapies may be developed by others for the treatment of indications Cytokinetics’ drug candidates and potential drug candidates may target. For further information regarding these and other risks related to Cytokinetics’ business, investors should consult Cytokinetics’ filings with the Securities and Exchange Commission, particularly under the caption “Risk Factors” in Cytokinetics’ Quarterly Report on Form 10-A for the quarter ended March 31, 2025. Forward-looking statements are not guarantees of future performance, and Cytokinetics’ actual results of operations, financial condition and liquidity, and the development of the industry in which it operates, may differ materially from the forward-looking statements contained in this press release. Any forward-looking statements that Cytokinetics makes in this press release speak only as of the date of this press release. Cytokinetics assumes no obligation to update its forward-looking statements whether as a result of new information, future events or otherwise, after the date of this press release. CYTOKINETICS® and the CYTOKINETICS and C-shaped logo are registered trademarks of Cytokinetics in the U.S. and certain other countries. Contact:Cytokinetics Diane WeiserSenior Vice President, Corporate Affairs(415) 290-7757  Cytokinetics, IncorporatedCondensed Consolidated Balance Sheets(in thousands)            June 30, 2025 December 31, 2024  (unaudited)    ASSETS     Current assets:    Cash and short term investments $858,135  $1,076,014 Other current assets  28,407   31,926 Total current assets  886,542   1,107,940 Long-term investments  178,201   145,055 Property and equipment, net  70,219   65,815 Operating lease right-of-use assets  76,120   75,158 Other assets  14,553   7,705 Total assets $1,225,635  $1,401,673  LIABILITIES AND STOCKHOLDERS’ DEFICIT     Current liabilities:    Accounts payable and accrued liabilities $68,543  $75,692 Short-term operating lease liabilities  19,585   18,978 Current portion of long-term debt  14,400   11,520 Derivative liabilities measured at fair value  17,600   11,300 Deferred revenue  1,344   52,370 Other current liabilities  9,592   9,814 Total current liabilities  131,064   179,674 Term loan, net  159,058   93,227 Convertible notes, net  553,987   552,370 Liabilities related to revenue participation right purchase agreements, net  489,503   462,192 Long-term operating lease liabilities  111,028   112,582 Liabilities related to RPI Transactions measured at fair value  147,700   137,000 Other non-current liabilities  2,015   — Total liabilities  1,594,355   1,537,045 Commitments and contingencies    Stockholders’ deficit    Common stock  119   118 Additional paid-in capital  2,628,829   2,563,876 Accumulated other comprehensive (loss) income  (158)  2,398 Accumulated deficit  (2,997,510)  (2,701,764)Total stockholders’ deficit  (368,720)  (135,372)Total liabilities and stockholders’ deficit $1,225,635  $1,401,673   Cytokinetics, IncorporatedCondensed Consolidated Statements of Operations(in thousands except per share data)(unaudited)           Three Months Ended Six Months Ended  June 30, 2025 June 30, 2024 June 30, 2025 June 30, 2024Revenues:        Collaboration revenues $2,416  $249  $3,995  $1,084 License and milestone revenues  64,353   —   64,353   — Total revenues  66,769   249   68,348   1,084 Operating expenses:        Research and development  112,554   79,597   212,395   161,167 General and administrative  65,721   50,824   123,090   96,324 Total operating expenses  178,275   130,421   335,485   257,491 Operating loss  (111,506)  (130,172)  (267,137)  (256,407)Interest expense  (11,084)  (12,732)  (19,952)  (19,835)Non-cash interest expense on liabilities related to revenue participation right purchase agreements  (13,181)  (11,567)  (27,259)  (21,785)Interest and other income, net  13,001   11,553   26,702   19,466 Change in fair value of derivative liabilities  3,000   (600)  2,600   (600)Change in fair value of liabilities related to RPI Transactions  (14,600)  200   (10,700)  200 Net loss $(134,370) $(143,318) $(295,746) $(278,961)Net loss per share — basic and diluted $(1.12) $(1.31) $(2.49) $(2.63)Weighted-average number of shares used in computing net loss per share — basic and diluted  119,457   109,240   118,979   106,013