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Compare · MRK vs RLYB

MRK vs RLYB

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

Summary

  • Both MRK and RLYB operate in Biotechnology: Pharmaceutical Preparations (Health Care), so they compete in similar markets.
  • MRK is the larger of the two at $295.19B, about 3502.0x RLYB ($84.3M).
  • Over the past year, MRK is up 50.7% and RLYB is up 452.5% - RLYB leads by 401.9 points.
  • MRK has been more active in the news (27 items in the past 4 weeks vs 4 for RLYB).
  • MRK has more recent analyst coverage (25 ratings vs 10 for RLYB).
PerformanceMRK+50.70%RLYB+452.55%
2025-06-09+0.00%2026-06-08
MetricMRKRLYB
Company
Merck & Company Inc.
Rallybio Corporation
Price
$119.49-1.15%
$16.04+0.06%
Market cap
$295.19B
$84.3M
1M return
+6.40%
+9.45%
1Y return
+50.70%
+452.55%
Industry
Biotechnology: Pharmaceutical Preparations
Biotechnology: Pharmaceutical Preparations
Exchange
NYSE
NASDAQ
IPO
2021
News (4w)
27
4
Recent ratings
25
10
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.

RLYB

Rallybio Corporation

Rallybio Corporation, a clinical-stage biotechnology company, engages in discovering, developing, manufacturing, and delivering therapies that enhance the lives of patients suffering from severe and rare diseases. Its lead product candidate is RLYB212, a preclinical-stage monoclonal anti-HPA-1a antibody for the prevention of fetal and neonatal alloimmune thrombocytopenia (FNAIT). The company is also developing RLYB211, a polyclonal anti-HPA-1a antibody that is in a Phase 1/2 clinical trial for the prevention of FNAIT; RLYB114, a pegylated C5 inhibitor in preclinical development for the treatment of complement-mediated ophthalmic diseases; and RLYB116, a subcutaneously administered inhibitor of complement factor 5, or C5, for the treatment of patients with paroxysmal nocturnal hemoglobinuria and generalized myasthenia gravis. The company also has discovery-stage programs that are focused on the identification of small molecule therapeutics for patients with rare metabolic diseases. Rallybio has collaboration with Exscientia for the development of small molecule therapeutics for rare diseases. Rallybio Corporation was incorporated in 2018 and is headquartered in New Haven, Connecticut. Rallybio Corporation operates as a subsidiary of Rallybio Holdings, LLC.