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Compare · GLSI vs MRK

GLSI vs MRK

Side-by-side comparison of Greenwich LifeSciences Inc. (GLSI) and Merck & Company Inc. (MRK): market cap, price performance, sector, and recent activity on the wire.

Summary

  • Both GLSI and MRK operate in Biotechnology: Pharmaceutical Preparations (Health Care), so they compete in similar markets.
  • MRK is the larger of the two at $297.02B, about 854.9x GLSI ($347.4M).
  • Over the past year, GLSI is up 155.5% and MRK is up 54.9% - GLSI leads by 100.6 points.
  • MRK has been more active in the news (29 items in the past 4 weeks vs 4 for GLSI).
  • MRK has more recent analyst coverage (25 ratings vs 2 for GLSI).
PerformanceGLSI+155.50%MRK+54.87%
2025-06-05+0.00%2026-06-04
MetricGLSIMRK
Company
Greenwich LifeSciences Inc.
Merck & Company Inc.
Price
$23.94-3.04%
$120.27+4.80%
Market cap
$347.4M
$297.02B
1M return
+6.97%
+6.29%
1Y return
+155.50%
+54.87%
Industry
Biotechnology: Pharmaceutical Preparations
Biotechnology: Pharmaceutical Preparations
Exchange
NASDAQ
NYSE
IPO
2020
News (4w)
4
29
Recent ratings
2
25
GLSI

Greenwich LifeSciences Inc.

Greenwich LifeSciences, Inc., a clinical stage biopharmaceutical company, focuses on the development of novel cancer immunotherapies for breast cancer and other HER2/neu-expressing cancers. Its lead product candidate is the GP2, an immunotherapy, which has completed Phase IIb clinical trial to prevent recurrence of breast cancer following surgery. The company was formerly known as Norwell, Inc. and changed its name to Greenwich LifeSciences, Inc. in March 2018. Greenwich LifeSciences, Inc. was incorporated in 2006 and is headquartered in Stafford, Texas.

MRK

Merck & Company Inc.

Merck & Co., Inc. operates as a healthcare company worldwide. It operates through two segments, Pharmaceutical and Animal Health segments. The Pharmaceutical segment offers human health pharmaceutical products in the areas of oncology, hospital acute care, immunology, neuroscience, virology, cardiovascular, diabetes, and women's health, as well as vaccine products. The Animal Health segment provides discovers, develops, manufactures, and markets a range of veterinary pharmaceuticals, vaccines, and health management solutions and services, as well as a suite of digitally connected identification, traceability, and monitoring products. The company has collaborations with AstraZeneca PLC; Bayer AG; Eisai Co., Ltd.; and Ridgeback Biotherapeutics. It serves drug wholesalers and retailers, hospitals, and government agencies; managed health care providers, such as health maintenance organizations, pharmacy benefit managers, and other institutions; and physicians and physician distributors, veterinarians, and animal producers. The company has collaboration agreement with Gilead Sciences, Inc. to co-develop and co-commercialize long-acting investigational treatment combinations of Lenacapavir and Islatravir in HIV; Amathus Therapeutics to develop treatments for neurodegenerative diseases; and Linnaeus Therapeutics, Inc. to evaluate LNS8801 in combination with KEYTRUDA for patients with advanced cancer. It also has a collaboration with Biomed X Gmbh for building on ongoing research projects in the fields of oncology (DNA damage response and RNA splicing) and autoimmunity (intestinal epithelial barrier in autoimmune diseases); and a collaboration agreement with NGM Biopharmaceuticals, Inc. to focus primarily on the development of novel medicines for unmet patient needs in retinal and CVM diseases, including heart failure. Merck & Co., Inc. was founded in 1891 and is headquartered in Kenilworth, New Jersey.