Who owns MRKWhat MRK owns
What Merck & Co., Inc. owns
The company's own 13F portfolio · as of 2026-03-31 · long US-listed stakes only — private holdings, bonds and cash are not disclosable on a 13F
$349.4M
disclosed stock portfolio
14
positions
33.6%
in MRNA
Positions, as of 2026-03-31
ordered by filed value · % of book = share of the disclosed stock portfolio · PUT/CALL tags = options positions (share-equivalents), not shares held
| # | Issuer | Shares | Value | % of book |
|---|---|---|---|---|
| 1 | MRNAMODERNA INC | 2.3M | $117.3M | 33.6% |
| 2 | PERSONALIS INC | 14.0M | $89.5M | 25.6% |
| 3 | KYMRKYMERA THERAPEUTICS INC | 772,165 | $64.3M | 18.4% |
| 4 | ENTRADA THERAPEUTICS INC | 1.7M | $22.0M | 6.3% |
| 5 | EIKON THERAPEUTICS INC | 1.7M | $17.6M | 5% |
| 6 | AKTIS ONCOLOGY INC | 952,844 | $17.0M | 4.9% |
| 7 | ALECTOR INC | 3.5M | $7.6M | 2.2% |
| 8 | SUTRO BIOPHARMA INC | 272,351 | $6.8M | 1.9% |
| 9 | EVAXION BIOTECH A/S | 1.2M | $4.5M | 1.3% |
| 10 | VRDNVIRIDIAN THERAPEUTICS INC | 93,414 | $1.8M | 0.5% |
| 11 | XILIO THERAPEUTICS INC | 105,982 | $891,309 | 0.3% |
| 12 | CARISMA THERAPEUTICS INC | 1.5M | $47,880 | 0% |
| 13 | NEUPHORIA THERAPEUTICS INC | 10,027 | $40,810 | 0% |
| 14 | TUHURA BIOSCIENCES | 19,445 | $34,807 | 0% |
Source: SEC Form 13F-HR filed by Merck & Co., Inc. (CIK 310158), reporting period 2026-03-31. Values are quarter-end filed marks. Research, not investment advice.