Who owns MRKWhat MRK owns
What Merck & Co., Inc. owns
The company's own 13F portfolio · as of 2026-06-30 · long US-listed stakes only — private holdings, bonds and cash are not disclosable on a 13F
$526.4M
disclosed stock portfolio
13
positions
35.8%
in PSNL
Positions, as of 2026-06-30
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 | PSNLPERSONALIS INC | 14.0M | $188.2M | 35.8% |
| 2 | MRNAMODERNA INC | 2.3M | $161.6M | 30.7% |
| 3 | KYMRKYMERA THERAPEUTICS INC | 772,165 | $88.5M | 16.8% |
| 4 | AKTSAKTIS ONCOLOGY INC | 952,844 | $30.7M | 5.8% |
| 5 | EIKNEIKON THERAPEUTICS INC | 1.7M | $21.7M | 4.1% |
| 6 | TRDAENTRADA THERAPEUTICS INC | 1.7M | $12.8M | 2.4% |
| 7 | STROSUTRO BIOPHARMA INC | 272,351 | $9.0M | 1.7% |
| 8 | ALECALECTOR INC | 3.5M | $7.1M | 1.4% |
| 9 | EVAXEVAXION BIOTECH A/S | 1.2M | $3.8M | 0.7% |
| 10 | VRDNVIRIDIAN THERAPEUTICS INC | 93,414 | $1.7M | 0.3% |
| 11 | XLOXILIO THERAPEUTICS INC | 105,982 | $1.0M | 0.2% |
| 12 | HURATUHURA BIOSCIENCES INC | 19,445 | $45,501 | 0% |
| 13 | NEUPNEUPHORIA THERAPEUTICS INC | 10,027 | $43,818 | 0% |
Source: SEC Form 13F-HR filed by Merck & Co., Inc. (CIK 310158), reporting period 2026-06-30. Values are quarter-end filed marks. Research, not investment advice.