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 its Board of Directors has extended the lock-up of the shares owned by the Company's directors, officers, and existing pre-IPO investors to January 31, 2027 which is approximately 76 months from the date of the Company's IPO. During this period, current officers, directors and certain shareholders will not be able to sell their shares of the Company's common stock unless otherwise modified by the Board of Directors. After January 31, 2027, the quantity of these locked-up shares that can be sold daily and over various periods of time will be restricted under a leak-out plan unless otherwise modified by the Board of Directors.

The Board could choose to end all or a small percentage of the 100% lock-up at any time for any reason, including prior to any data announcements, interim analyses, strategic transactions, such as an acquisition or partnership, or financial transactions, such as royalty or strategic investor transactions that provide a potential bridge to commercialization. The Board could also choose to implement a pre-determined leak-out plan and/or a 10b5-1 selling program at any time for any reason that allows for the organized independent selling of some of the locked-up shares by a third party over a specified period of time. Such decisions may or may not be announced at the time of the board's decision.