Who owns Keytruda’s patents today?
Keytruda (pembrolizumab) is an anti–PD-1 monoclonal antibody developed by Merck and Co. (known outside the U.S. as MSD). The company is the primary patent-holder for Keytruda’s core intellectual property, including inventions covering the antibody and related therapeutic use.
Which companies typically appear on Keytruda patent filings?
Beyond Merck/MSD, patent records for biologic medicines often include additional assignees such as:
- corporate affiliates involved in R&D and commercialization in specific countries, and
- academic or research partners named on particular invention disclosures.
Whether those additional assignees hold “key” patents depends on the specific patent family and jurisdiction; the assignee listed on each patent document is the most reliable source for ownership.
How to verify the exact current patent holder for a specific Keytruda patent
For an up-to-date, jurisdiction-specific answer, you generally need to look up the assignee on the relevant patent document(s) in the country/region you care about (for example, US, EP, JP). Patent databases list the current assignee (which can change after assignments, mergers, or transfers).
If you tell me which country/region you mean (US, Europe/EP, UK, etc.) and whether you’re asking about the broadest “core” patents or a specific patent number/family, I can narrow down the likely assignees that would appear in those filings.
Why ownership can differ from “who sells it”
The patent owner (assignee) is not always the same as the marketing company name shown on the drug label. Ownership can sit with the R&D/legal entities within a corporate group, even though one entity sells the product.
Sources
I don’t have the specific patent-number or jurisdiction information needed to state exactly which legal assignees currently hold particular Keytruda patents, and I’m not able to fetch live patent database records from here. If you share a patent number or the jurisdiction (e.g., “US patents for pembrolizumab”), I can help interpret which assignee(s) are listed on those records.