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Greenwich LifeSciences

GLSI

Market cap $230M

15.67 USD

-3.06

16.34%

At close Updated Aug 28, 4:00 PM EDT

Pre-market

After hours

16.24

+0.57

3.64%

1 day

-16.34%

5 days

-5.83%

1 month

16.51%

3 months

-45.95%

6 months

-42.79%

Year to date

-19.52%

1 year

36.74%

5 years

-60.42%

10 years

213.4%

About: Greenwich LifeSciences Inc a clinical-stage biopharmaceutical company focused on its Phase III clinical trial, Flamingo-01, which is evaluating GLSI-100, an immunotherapy to prevent breast cancer recurrences. GP2 is a 9-amino-acid transmembrane peptide of the HER2/neu protein, a cell surface receptor protein that is expressed in a variety of common cancers, including breast cancers at low (1+), intermediate (2+), and high (3+ or overexpressing) levels.

Employees: 13

Healthcare Biotechnology

News

Positive

Neutral

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Sentiment 3-Months

Positive 11.1%

Neutral 77.8%

Negative 11.1%

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Greenwich LifeSciences Extends Lock-up of Directors and Officers to January 31, 2027

STAFFORD, Texas, Aug. 10, 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 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.

Greenwich LifeSciences Extends Lock-up of Directors and Officers to January 31, 2027

Greenwich LifeSciences Announces Approval to Expand FLAMINGO-01 into the United Kingdom

STAFFORD, Texas, July 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 GLSI-100, an immunotherapy to prevent breast cancer recurrences, today announced the regulatory approval to expand FLAMINGO-01 into the United Kingdom.

Greenwich LifeSciences Announces Approval to Expand FLAMINGO-01 into the United Kingdom

Greenwich LifeSciences Provides Clinical Updates on FLAMINGO-01

STAFFORD, Texas, July 20, 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 GLSI-100, an immunotherapy to prevent breast cancer recurrences, today provided the following clinical updates on FLAMINGO-01.

Greenwich LifeSciences Provides Clinical Updates on FLAMINGO-01

Greenwich LifeSciences Announces European Approval for Combining Both HLA Populations in FLAMINGO-01

STAFFORD, Texas, July 16, 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 GLSI-100, an immunotherapy to prevent breast cancer recurrences, today provided the following update on the combination of both HLA-A*02 and non-HLA-A*02 patients in FLAMINGO-01 in Europe.

Greenwich LifeSciences Announces European Approval for Combining Both HLA Populations in FLAMINGO-01

Greenwich LifeSciences The Overlooked Need

Greenwich LifeSciences is a single-asset biotech focused on GLSI-100, an immunotherapy for HER2-positive breast cancer, currently in Phase 3 trials. GLSI-100 demonstrated a 70-80% reduction in cancer recurrence in Phase 2b, outperforming approved therapies, with no serious adverse events reported. GLSI trades at a ~$279M market cap, below recent M&A comps, despite advanced clinical progress and a large addressable market in HER2/neu-positive breast cancer.

Greenwich LifeSciences The Overlooked Need

Greenwich LifeSciences Announces European Approval for Use of Commercially Manufactured GP2 in FLAMINGO-01

STAFFORD, Texas, July 09, 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 GLSI-100, an immunotherapy to prevent breast cancer recurrences, today provided the following update on the use of commercially manufactured GP2 in FLAMINGO-01 in Europe.

Greenwich LifeSciences Announces European Approval for Use of Commercially Manufactured GP2 in FLAMINGO-01

Greenwich LifeSciences Presents FLAMINGO-01 Phase III Trial Open Label Data Published at ASCO Meeting 2026

STAFFORD, Texas, June 01, 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 presents the published abstract and poster from the ASCO Annual Meeting 2026.

Greenwich LifeSciences Presents FLAMINGO-01 Phase III Trial Open Label Data Published at ASCO Meeting 2026

Greenwich LifeSciences Provides Update Regarding Form 10-K Filing

STAFFORD, Texas, June 01, 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 provided an update on its Form 10-K filing for the fiscal year ending December 31, 2025.

Greenwich LifeSciences Provides Update Regarding Form 10-K Filing

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

STAFFORD, Texas, May 22, 2026 (GLOBE NEWSWIRE) -- Greenwich LifeSciences, Inc. (Nasdaq: GLSI) ("Greenwich" or 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 May 20, 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 Quarterly Report on Form 10-Q for the three months ended March 31, 2026, 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."

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

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