Greenwich LifeSciences Announces Receipt of Nasdaq Notice Regarding Late Form 10-K Filing

STAFFORD, Texas, April 22, 2026 (GLOBE NEWSWIRE) -- Greenwich LifeSciences, Inc. (Nasdaq: GLSI) (the "Company"), a clinical-stage biopharmaceutical company focused on its Phase III clinical trial, FLAMINGO-01, which is evaluating Fast Track designated GLSI-100, an immunotherapy to prevent breast cancer recurrences, today announced that on April 16, 2026, the Company received notification from the Listing Qualifications Department of The Nasdaq Stock Market LLC notifying the Company that, because it has not yet filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2025, the Company is not currently in compliance with Nasdaq Listing Rule 5250(c)(1), which requires timely filing of periodic financial reports with the Securities and Exchange Commission. The notice has no immediate effect on the listing or trading of the Company's common stock, which continues to trade on the Nasdaq Capital Market under the symbol "GLSI."

The Company plans to file its Form 10-K for the fiscal year ended December 31, 2025 as soon as possible, working with both of its auditors where each auditor is responsible for their own periods ending in 2024 and 2025.

Greenwich LifeSciences is a clinical-stage biopharmaceutical company focused on the development of GP2, an immunotherapy to prevent breast cancer recurrences in patients who have previously undergone surgery. GP2 is a 9 amino acid transmembrane peptide of the HER2 protein, a cell surface receptor protein that is expressed in a variety of common cancers, including expression in 75% of breast cancers at low (1+), intermediate (2+), and high (3+ or over-expressor) levels. Greenwich LifeSciences has commenced a Phase III clinical trial, FLAMINGO-01. For more information on Greenwich LifeSciences, please visit the Company's website atwww.greenwichlifesciences.comand follow the Company's Twitter athttps://twitter.com/GreenwichLS.

Statements in this press release contain "forward-looking statements" that are subject to substantial risks and uncertainties. All statements, other than statements of historical fact, contained in this press release are forward-looking statements. Forward-looking statements contained in this press release may be identified by the use of words such as "anticipate," "believe," "contemplate," "could," "estimate," "expect," "intend," "seek," "may," "might," "plan," "potential," "predict," "project," "target," "aim," "should," "will," "would," or the negative of these words or other similar expressions, although not all forward-looking statements contain these words. Forward-looking statements are based on Greenwich LifeSciences Inc.'s current expectations and are subject to inherent uncertainties, risks and assumptions that are difficult to predict, including statements regarding the intended use of net proceeds from the public offering; consequently, actual results may differ materially from those expressed or implied by such forward-looking statements. Further, certain forward-looking statements are based on assumptions as to future events that may not prove to be accurate. These and other risks and uncertainties are described more fully in the section entitled "Risk Factors" in Greenwich LifeSciences' Annual Report on the most recent Form 10-K for the year ended December 31, 2024, and other periodic reports filed with the Securities and Exchange Commission. Forward-looking statements contained in this announcement are made as of this date, and Greenwich LifeSciences, Inc. undertakes no duty to update such information except as required under applicable law.