Serabelisib

AUSTIN, Texas--(BUSINESS WIRE)--Faeth Therapeutics, Inc. (Nasdaq: FTH) today announced that the Compensation Committee of Faeth’s Board of Directors granted two new employees options to purchase an aggregate of 11,000 shares of the Company’s common stock in connection with their employment (collectively, the “Option Awards”). The Option Awards were granted effective August 4, 2026, pursuant to the Company’s 2026 Inducement Plan as a material inducement to the individuals entering employment with Faeth in accordance with Nasdaq Listing Rule 5635(c)(4). The Option Awards have an exercise price of $25.50 per share, equal to the closing price of the Company’s common stock on the grant date. The Option Awards will vest, with respect to 25% of the shares subject to each such award, on the first anniversary of the applicable employee’s start date, with the remaining shares vesting in 36 substantially equal monthly installments thereafter, in each case subject to such employee’s continued service with Faeth through each such vesting date. The Option Awards have a term of ten years from the grant date and are otherwise subject to the terms and conditions of the 2026 Inducement Plan and the applicable award agreement. About Faeth Therapeutics Faeth Therapeutics, Inc. (Nasdaq: FTH) is a clinical-stage biotechnology company focused on improving outcomes for cancer patients through multi-node inhibition of critical oncogenic pathways. The Company’s lead program is PIKTOR, an investigational all-oral combination of serabelisib and sapanisertib in development for endometrial and breast cancer. Faeth was co-founded in 2019 by Anand Parikh and Oliver Maddocks, Ph.D., together with scientific founders Lewis Cantley, Ph.D., the discoverer of the PI3K pathway; Siddhartha Mukherjee, M.D., D.Phil.; Karen Vousden, Ph.D.; Scott Lowe, Ph.D.; and Greg Hannon, Ph.D. The Company intends to use its website as a means of disclosing material non-public information and for complying with its disclosure obligations under Regulation FD. For more information, please visit and follow the Company on LinkedIn. ezstandalone.cmd.push(function () { ezstandalone.showAds(131); }); Contacts Investor Contact: Matthew Biegler, SVP, Investor Relations matt@faeththerapeutics.com Media Contact: Patrick Schmidt, Consort Partners faeththerapeutics@consortpartners.com

— The data will be presented at the 2026 Summit for Novel Therapeutics in Oncology and Precision Medicine in Cancer conference on August 8 — These data collectively informed PIKTOR dose selection in the ongoing Phase 2 trial in second-line advanced endometrial cancer (Study FTH-PIK-201) AUSTIN, Texas--(BUSINESS WIRE)--Faeth Therapeutics (Nasdaq: FTH), a clinical-stage oncology company developing PIKTOR, an investigational all-oral, multi-node inhibitor of the PI3K/AKT/mTOR pathway, will present translational data and pharmacokinetic/pharmacodynamic (PK/PD) analysis for PIKTOR, its oral combination of serabelisib and sapanisertib, at the 2026 Summit for Novel Therapeutics in Oncology & Precision Medicine in Cancer (STOP Cancer), held August 7-8 in New York. The poster titled "Exposure/Response Analysis of an Oral Multi-Node PI3K/AKT/mTOR Pathway Inhibitor Combination of Serabelisib and Sapanisertib" will be presented on August 8 between 10:25 and 11:30 AM at the New York Marriott Marquis in New York, NY (Poster #9). ezstandalone.cmd.push(function () { ezstandalone.showAds(131); }); Data to be reported include a PK/PD analysis that integrates skin biopsy data and PK modeling from earlier third-party clinical trials of serabelisib and sapanisertib. Together, these data informed selection of 3 mg sapanisertib and 200 mg serabelisib three days a week as the recommended Phase 2 dose for PIKTOR in the ongoing Phase 2 trial in second-line advanced endometrial cancer, Study FTH-PIK-201 (NCT06463028). A copy of the poster will be made available in the Investors section of Faeth's website at the start of the poster session. About PIKTOR PIKTOR is an investigational, proprietary, all-oral combination of serabelisib, a selective PI3K-alpha inhibitor, and sapanisertib, an mTORC1/mTORC2 inhibitor, designed to inhibit multiple nodes of the PI3K/AKT/mTOR pathway. According to published literature, this pathway is dysregulated in up to 50% of all solid tumors, making it one of the most prevalent therapeutic targets in oncology. PIKTOR is being evaluated in a Phase 2 trial in second-line advanced endometrial cancer (Study FTH-PIK-201), with topline data anticipated by year-end 2026. PIKTOR is also being evaluated in a Phase 1b/2 trial in HR+/HER2- advanced breast cancer (Study FTH-PIK-101), in which the first patient was dosed in April 2026 and interim data is anticipated in 2027. About Faeth Therapeutics Faeth Therapeutics, Inc. (Nasdaq: FTH) is a clinical-stage biotechnology company focused on improving outcomes for cancer patients through multi-node inhibition of critical oncogenic pathways. The Company’s lead program is PIKTOR, an investigational all-oral combination of serabelisib and sapanisertib in development for endometrial and breast cancer. Faeth was co-founded in 2019 by Anand Parikh and Oliver Maddocks, Ph.D., together with scientific founders Lewis Cantley, Ph.D., the discoverer of the PI3K pathway; Siddhartha Mukherjee, M.D., D.Phil.; Karen Vousden, Ph.D.; Scott Lowe, Ph.D.; and Greg Hannon, Ph.D. For more information, please visit and follow the Company on LinkedIn . Cautionary Note Regarding Forward-Looking Statements This press release contains “forward-looking statements” within the meaning of the federal securities laws, including the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include all statements that are not historical facts and may be identified by words such as “anticipate,” “believe,” “expect,” “intend,” “plan,” “may,” “will,” “would,” “could,” “should,” “estimate,” “potential,” “target,” “on track” and similar expressions, although not all forward-looking statements contain these words. These statements include, but are not limited to, statements regarding: the content, timing and presentation of data at the STOP Cancer conference; the Company’s interpretation of preclinical, pharmacokinetic and pharmacodynamic data and the conclusions the Company draws from that data, including with respect to dose and schedule selection for PIKTOR; the Company’s expectations regarding its pipeline and development plans, including the Phase 2 trial of PIKTOR in advanced endometrial cancer and the anticipated timing of topline data, and the Phase 1b/2 trial of PIKTOR in HR+/HER2- advanced breast cancer and the anticipated timing of interim data; and the potential therapeutic benefits, tolerability pro differentiation of PIKTOR. Forward-looking statements are based on management’s current expectations and assumptions and are subject to a number of risks and uncertainties, many of which are beyond the Company’s control, that could cause actual results to differ materially from those expressed or implied. These risks and uncertainties include, among others, risks related to clinical development and the conduct, timing and results of clinical trials; the risk that results from preclinical studies, earlier clinical trials, modeling or other exploratory analyses may not be predictive of results in ongoing or future clinical trials; the Company’s need for additional financing; its limited operating history and history of operating losses; risks related to the integration of Faeth; the Company’s ability to satisfy applicable Nasdaq listing requirements and to maintain the listing of its common stock; and the other risks and uncertainties described under the headings “Risk Factors” and “Summary of Risk Factors” in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission (the “SEC”) on March 30, 2026, its Quarterly Report on Form 10-Q filed with the SEC on August 4, 2026, and its definitive proxy statement filed with the SEC on April 27, 2026, as well as in the Company’s subsequent filings. Forward-looking statements speak only as of the date of this press release, and the Company undertakes no obligation to update any forward-looking statement, except as required by law. Contacts Investor Contact: Matthew Biegler, SVP, Investor Relations matt@faeththerapeutics.com Media Contact: Patrick Schmidt, Consort Partners faeththerapeutics@consortpartners.com