Merck & Co.
pharma Rahway, NJ · MRK · Public
Merck is expanding its vaccine portfolio with FDA approval for Capvaxive's use in at-risk children and adolescents, while strengthening its drug discovery pipeline through a new AI collaboration with Protillion Biosciences. The company is also advancing its oncology leadership with FDA approvals for Keytruda combinations in renal cell carcinoma treatment.
Merck & Co., Inc. is a global healthcare leader with operations spanning two core divisions: Pharmaceuticals and Animal Health. The Pharmaceutical segment is dedicated to human health, offering a broad spectrum of medicinal products. These cover crucial therapeutic areas such as oncology, acute hospital care, immunology, neuroscience, virology, cardiovascular conditions, and diabetes. This division also develops vital preventive vaccines for pediatric, adolescent, and adult populations. Meanwhile, the Animal Health segment focuses on the research, development, manufacturing, and marketing of veterinary medications, vaccines, and comprehensive health management solutions for animals. This division further provides innovative digital products designed for animal identification, traceability, and continuous monitoring. Merck's extensive clientele encompasses drug wholesalers, pharmacies, hospitals, and government agencies. It also serves managed healthcare organizations, including health maintenance organizations (HMOs) and pharmacy benefit managers, as well as various other institutional clients. Additionally, the company supplies products to individual physicians and their distributors, veterinarians, and livestock producers. The organization actively engages in strategic collaborations with companies such as AstraZeneca PLC, Bayer AG, Eisai Co., Ltd., Ridgeback Biotherapeutics, and Gilead Sciences, Inc. These partnerships are specifically aimed at the joint development and commercialization of prolonged-acting therapies for HIV. Established in 1891, Merck & Co., Inc. maintains its corporate headquarters in Kenilworth, New Jersey.
Employees
73,000
Mfg Plants
13
All Facilities
20
Activity
7/10
Type
Public
Plant Locations (20 mapped)
MRK Stock Price
Recent News
Merck (MRK) Stock Falls Amid Market Uptick: What Investors Need to Know
Zacks Investment Research · 6/18/2026
FDA Expands Merck Pneumococcal Shot Label To Include At-Risk Children And Teens
Benzinga · 6/18/2026
Merck's pneumococcal vaccine wins US approval for high-risk children, teens
Reuters · 6/18/2026
U.S. FDA Approves an Additional Indication for CAPVAXIVE® (Pneumococcal 21-valent Conjugate Vaccine) in Children and Adolescents Aged 2 through 17 at Increased Risk for Pneumococcal Disease
Business Wire · 6/18/2026
Study Reveals Dog Owners and Veterinarians See Challenges in Treating Allergic Skin Disease, Highlighting a Need for a Targeted Rapid Onset Treatment for Dogs of All Ages
Business Wire · 6/17/2026
FDA Accepts Gilead's Filing for Weekly Oral Yeztugo for HIV Prevention
Zacks Investment Research · 6/16/2026
Protillion Biosciences Announces Drug Discovery Collaboration with Merck
Business Wire · 6/16/2026
Merck: Buy The Dip On This Dividend Growth Pharma Leader
Seeking Alpha · 6/16/2026
3 Dividend Stocks to Hold for the Long Haul
The Motley Fool · 6/16/2026
FDA Approves KEYTRUDA® (pembrolizumab) and KEYTRUDA QLEX™ (pembrolizumab and berahyaluronidase alfa-pmph), Each With WELIREG® (belzutifan), for Adjuvant Treatment of Certain Patients With Clear Cell Renal Cell Carcinoma (ccRCC)
Business Wire · 6/12/2026
Manufacturing Plants (13)
Merck Animal Health – Millsboro
Millsboro, DE
Center of excellence for veterinary biologics; three integrated campuses; manufactures vaccines for bovine, swine, poultry, companion animals (cats, dogs, equine); one of world's largest poultry vaccine producers; USDA- and EU (VMD)-certified; 300+ employees.
Merck Wilmington Biotech (under construction)
Wilmington, DE
$1B, 470,000 sq ft biologics center of excellence; groundbreaking April 2025; will produce next-generation biologics, Keytruda (pembrolizumab), and antibody-drug conjugates (ADCs); lab operational by 2028, production of investigational compounds by 2030; 500+ planned full-time roles.
Merck Animal Health – Ames
Ames, IA
Located in Iowa State University Research Park; Animal Health vaccine manufacturing for livestock (swine, poultry) and companion animals; four-year strategic alliance with Iowa State University for innovation in animal health.
Merck Animal Health – De Soto Biologics
De Soto, KS
Animal Health biologics manufacturing; produces large-molecule vaccines and biologic products (fill and freeze-dry); $895M expansion announced May 2025 ($860M manufacturing + $35M R&D labs) adding 200,000 sq ft; part of Kansas City animal health corridor.
Merck Animal Health – Baton Rouge (Allflex Ear Tag)
Baton Rouge, LA
Formerly veterinary medicine manufacturing site; converted in 2022 to Allflex Livestock Intelligence ear tag production (RFID and visual ID tags for cattle traceability); operational since September 2022; up to 33 employees at full capacity.
Merck Animal Health – Worthington
Worthington, MN
Animal Health manufacturing and supply; produces vaccines and treatments for livestock and companion animals; USDA- and EU-certified site supporting worldwide markets.
Merck Maurice R. Hilleman Center for Vaccine Manufacturing – Durham
Durham, NC
262-acre site in Treyburn Corporate Park; manufactures Gardasil/Gardasil 9 (HPV), measles, mumps, rubella, and varicella vaccines; $1B, 225,000 sq ft new facility opened March 2025 (Maurice R. Hilleman Center); advanced data analytics, generative AI, 3D printing, digital twin capabilities.
Merck Manufacturing – Wilson
Wilson, NC
Filling and packaging plant; produces RotaTeq (rotavirus vaccine) filling/packaging; also packaging operations for Gardasil/Gardasil 9 HPV vaccines; expanded multiple times including $57M and $680M investments with Durham.
Merck Animal Health – Elkhorn Manufacturing
Elkhorn, NE
Animal Health manufacturing; 300+ professionals; produces companion animal vaccines and livestock vaccines for dogs, cats, horses, cattle, swine, poultry, farmed fish; over 50 of Merck's 350+ licensed vaccines manufactured here; includes R&D, Regulatory Affairs, Biotechnology.
Merck West Point Manufacturing & R&D Campus
West Point, PA
Merck's largest US manufacturing facility; 400-acre site; manufactures pharmaceuticals and vaccines (including MMR, varicella, Gardasil, Zostavax); also houses core translational medicine, discovery, preclinical and clinical R&D in infectious diseases, vaccine discovery, and neuroscience.
Merck Las Piedras Operations
Las Piedras, PR
Built 1985; one of only two Merck global sites dedicated to new product development and launch; produces Belsomra, Atozet, Janumet, Ribavirin, Clarinex, Temodar, Zetia, Segluromet among others; distributes to 75 countries; 500+ employees including Carolina commercial site.
Merck Animal Health – Dallas/DFW (Allflex Ear Tag)
Dallas, TX
Allflex Livestock Intelligence ear tag production facility near DFW Airport; manufactures RFID and visual livestock identification ear tags for cattle; primary US ear tag site alongside the Baton Rouge facility.
Merck Stonewall Manufacturing Site – Elkton
Elkton, VA
Operating since 1941; 1.2M sq ft complex, 1,000+ employees; current production of small molecule APIs and drug products including HPV vaccine intermediates; $3B Center of Excellence expansion (400,000 sq ft) broke ground October 2025 for additional API and drug product manufacturing; also known as 'Stonewall site'.
Other Facilities (7)
Merck Animal Health – Omaha Distribution Center
Omaha, NE · distribution
Major global distribution hub; processes nearly $2B in annual throughput; ships to 15,000+ US customers and 70+ international markets; 60–75 employees; nearly all US-made Merck Animal Health products distributed through here.
Merck World Headquarters
Rahway, NJ · hq
World HQ (opened 1903, reimagined 2023); 210-acre campus spanning Rahway and Linden; 6,000+ employees; research-focused campus with core chemistry, preclinical development, biologics, synthetic chemistry; FLEx Center; $3.5B planned investment including clinical manufacturing expansion.
Merck Upper Gwynedd Campus (US Human Health HQ & R&D)
North Wales, PA · hq
90-acre campus; divisional headquarters for US Human Health division; houses clinical development and regulatory affairs research laboratories; approximately 1 mile from West Point manufacturing site.
Merck Research Laboratories – San Diego
San Diego, CA · r&d
Newest MRL site (joined 2023 via Prometheus Biosciences acquisition, $10.8B); 60+ scientists; focuses on discovery biologics, immunology, data science, and precision medicine approaches to autoimmune/inflammatory diseases; Sorrento Valley location.
Merck Research Laboratories – South San Francisco
South San Francisco, CA · r&d
Nine-story biologics research facility; 300+ scientists; focuses on immunology, oncology, biologics, and biopharmaceutical research spanning exploratory research through early clinical development; opened October 2019.
Merck Research Laboratories – Boston
Boston, MA · r&d
450-employee discovery research center in Longwood Medical Area; established 2004; focuses on immunology, oncology, diabetes, and neuroscience; translational medicine, discovery, preclinical and clinical functional areas.
Merck Exploratory Science Center – Cambridge
Cambridge, MA · r&d
Disease-agnostic early-stage discovery research; founded 2016; focuses on microbiome and human immunity; expanded 2022 by 100 employees and 160,000 sq ft; explores emerging science and technology for drug discovery opportunities.