MERCK & CO. INC. (MRK) Stock Institutional Trading Activity
MERCK & CO. INC. (MRK) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Causeway Capital Management, Cullen Value Fund, Kahn Brothers Group, Matrix Private Capital Group, and Mairs & Power Growth Fund. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.
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- MERCK & CO. INC. (MRK) stock institutional ownership
- MERCK & CO. INC. (MRK) stock insider trading activity
- Stock rankings
| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q4 2022 | Sound Shore Management | Sell | -9,479 | 658,679 | $73,080,435 |
| Q4 2022 | Dodge & Cox Stock Fund | Sell | -14,100 | 175,231 | $19,441,879 |
| Q4 2022 | Renaissance Technologies LLC | Sell | -2,883,132 | 1,680,102 | $186,407 |
| Q4 2022 | Matrix Advisors Value Fund | Sell | -690 | 4,175 | $463,216 |
| Q4 2022 | Matrix Private Capital Group | Sell | -7 | 8,601 | $960,560 |
| Q4 2022 | Mairs & Power Growth Fund | Sell | -1,666 | 73,466 | $8,151,053 |
| Q4 2022 | Sequoia Financial Advisors | Buy | 48,199 | 175,512 | $19,473,095 |
| Q4 2022 | Parnassus Endeavor Fund | Sell | -374,841 | 1,931,707 | $214,322,892 |
| Q4 2022 | Gardner Russo & Quinn | Sell | -185 | 3,673 | $407,517 |
| Q3 2022 | Kahn Brothers Group | Sell | -14,769 | 684,255 | $58,583,183 |
| Q3 2022 | Sound Shore Management | Buy | 5,644 | 668,158 | $57,542 |
| Q3 2022 | Dodge & Cox Stock Fund | Sell | -3,500 | 189,331 | $16,305 |
| Q3 2022 | Matrix Private Capital Group | Sell | -2,299 | 8,608 | $747 |
| Q3 2022 | Hillman Value Fund | Sell | -31,407 | 66,707 | $5,745 |
| Q3 2022 | Mairs & Power Growth Fund | Buy | 18,289 | 75,132 | $6,470 |
| Q3 2022 | Sequoia Financial Advisors | Sell | -1,218 | 127,313 | $10,964 |
| Q3 2022 | Renaissance Technologies LLC | Sell | -2,200,700 | 4,563,234 | $392,986 |
| Q3 2022 | Hancock Classic Value | Sell | -710 | 6,425 | $553 |
| Q3 2022 | Gardner Russo & Quinn | Sell | -51 | 3,858 | $332 |
| Q2 2022 | Kahn Brothers Group | Buy | 4,489 | 699,024 | $63,730,136 |
| Q2 2022 | Sound Shore Management | Sell | -648,082 | 662,514 | $60,401 |
| Q2 2022 | Dodge & Cox Stock Fund | Sell | -7,200 | 192,831 | $17,580 |
| Q2 2022 | Matrix Advisors Value Fund | Sell | -164,178 | 4,865 | $444 |
| Q2 2022 | Matrix Private Capital Group | Buy | 379 | 10,907 | $1,001 |
| Q2 2022 | Semper Augustus Investments Group | Buy | 400 | 44,473 | $4,055 |
| Q2 2022 | Mairs & Power Growth Fund | Sell | -3,302 | 56,843 | $5,182 |
| Q2 2022 | Hillman Value Fund | Sell | -1,385 | 98,114 | $8,945 |
| Q2 2022 | Sequoia Financial Advisors | Sell | -56,835 | 128,531 | $11,719 |
| Q2 2022 | Renaissance Technologies LLC | Buy | 1,664,600 | 6,763,934 | $616,668 |
| Q2 2022 | Hancock Classic Value | Buy | 2,043 | 7,135 | $650 |
Frequently asked questions about MRK activity
Which institutional owners are buying MRK?
Institutional owners buying MRK include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in MRK activity?
"Buy" means an investor increased their reported position in MRK compared to the prior reporting period. This reflects growing exposure to MERCK & CO. INC. (MRK) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in MRK increasing?
Institutional interest in MRK can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.