MRK
Merck & Co. Inc.
11 super-investors hold MRK worth a combined $2.13B. The largest position: Kahn Brothers Group at 4.8% of their portfolio. This quarter the cohort logged 1 buy and 1 sell on the name. Cohort Conviction Score: 41 — ranked #115 of 724 scored stocks. Conviction rising: 1 more super-investor hold it than in 2025Q4.
Why super-investors own MRK
MRK ownership within the cohort has been gradually building, rising from 3 holders a year ago to 11 today — though the trend this quarter is mixed rather than decisively bullish. Thomas Russo initiated a new position in 2026Q1, the sole addition to the ownership roster, while Kahn Brothers Group trimmed despite holding the highest-conviction stake at 4.8% of their portfolio. Bill Nygren anchors the cohort's $2.1B combined exposure with $1.5B, making his position the dominant driver of aggregate value. Joel Greenblatt holds $460M at modest 0.3% concentration, consistent with a broad quantitative approach. Overall, the cohort picture is one of steady, low-drama accumulation rather than surging conviction — interest is gently rising, but no single actor is making an aggressive move.
AI-synthesized from 13F filings. Not investment advice.
Cohort owners over time
2016Q2 → 2026Q1How many of the cohort members held this stock each quarter.
Owners (11) · click any column to sort
| #↑ | Manager | % Port. | History | Value | Shares |
|---|---|---|---|---|---|
| 1 | Bill Nygren | 2.0% | 7q | $1.49B | 12,366,933 |
| 2 | Joel Greenblatt | 0.3% | 38q | $460M | 3,821,227 |
| 3 | Sarah Ketterer | 1.3% | 12q | $103M | 854,212 |
| 4 | Kahn Brothers Group | 4.8% | 17q | $27M | 227,288 |
| 5 | Prem Watsa | 1.1% | 22q | $21M | 172,900 |
| 6 | Dodge & Cox Funds | <0.1% | 40q | $16M | 136,050 |
| 7 | Mairs & Power Funds | 0.1% | 40q | $6M | 50,348 |
| 8 | Christopher Bloomstran | 0.6% | 40q | $5M | 44,633 |
| 9 | Richard Pzena | <0.1% | 28q | $302K | 2,511 |
| 10 | Thomas Russo | <0.1% | 28q | $258K | 2,141 |
| 11 | David Katz | <0.1% | 40q | $201K | 1,671 |
- 1Bill Nygrenport2.0%val$1.49B12,366,933 sh·7q held
- 2Joel Greenblattport0.3%val$460M3,821,227 sh·38q held
- 3Sarah Kettererport1.3%val$103M854,212 sh·12q held
- 4Kahn Brothers Groupport4.8%val$27M227,288 sh·17q held
- 5Prem Watsaport1.1%val$21M172,900 sh·22q held
- 6Dodge & Cox Fundsport<0.1%val$16M136,050 sh·40q held
- 7Mairs & Power Fundsport0.1%val$6M50,348 sh·40q held
- 8Christopher Bloomstranport0.6%val$5M44,633 sh·40q held
- 9Richard Pzenaport<0.1%val$302K2,511 sh·28q held
- 10Thomas Russoport<0.1%val$258K2,141 sh·28q held
- 11David Katzport<0.1%val$201K1,671 sh·40q held
Owners of MRK also hold
Recent activity (2)
| Manager | Move | % Port. | Δ Shares | Value | Filed |
|---|---|---|---|---|---|
| Thomas Russo | NEW | <0.1% | +100% | $258K | May 13, 2026 |
| Kahn Brothers Group | TRIM | 4.8% | -47% | $27M | May 8, 2026 |
Long US equity 13F-HR filings only. CUSIP 58933Y105. Not investment advice.