Which funds own MRK
Merck & Co Inc in the Q2 2026 filings. At least 18 of the 91 current managers on file reported a position, worth $28.7bn between them. It is among the largest positions of fewer than a fifth of the current managers on file. Buying and selling roughly cancelled this quarter, which is what a name looks like when the argument is still live.
- Managers holding
- 18
- at least, of 91 current
- Combined value
- $28.7bn
- as reported
- Opened
- 0
- new this quarter
- Added to
- 10
- already held
- Trimmed or sold out
- 9
- 1 sold out entirely
Only each manager’s largest 200 positions are listed here, so a smaller holder may be missing.
Managers reporting a position
Largest first. Weight is the share of that manager’s whole reported book, which is the number worth quoting: $400m is a rounding error in one book and a defining bet in another.
| Manager | Value | Weight | Shares | Change on the quarter | Action |
|---|---|---|---|---|---|
| Wellington Management Group LLP Long-only · $580bn book | $11.1bn | 1.9% | 86,249,283 | +$941m+1,934,312 | Added |
| Fidelity (FMR LLC) Long-only · $2304bn book | $5.8bn | 0.3% | 45,440,355 | +$484m+924,345 | Added |
| Invesco Ltd Long-only · $1264bn book | $2.4bn | 0.2% | 18,611,171 | -$237m-3,243,930 | Trimmed |
| T. Rowe Price Associates Inc Long-only · $999bn book | $2.4bn | 0.2% | 18,518,796 | -$392m-4,524,046 | Trimmed |
| AllianceBernstein LP Long-only · $302bn book | $1.6bn | 0.5% | 13,131,942 | +$390m+1,830,456 | Added |
| Harris Associates LP Value · $75.4bn book | $1.6bn | 2.1% | 12,073,109 | +$64m-293,824 | Trimmed |
| AQR Capital Management LLC Quantitative · $287bn book | $1.0bn | 0.4% | 8,134,262 | +$1.5m-494,224 | Trimmed |
| Arrowstreet Capital LP Quantitative · $225bn book | $510m | 0.2% | 3,966,523 | +$157m+1,030,193 | Added |
| Janus Henderson Group Ltd Long-only · $245bn book | $501m | 0.2% | 3,901,539 | +$155m+1,021,340 | Added |
| Acadian Asset Management LLC Quantitative · $84.2bn book | $475m | 0.6% | 3,695,329 | -$31m-507,052 | Trimmed |
| Neuberger Berman Group LLC Long-only · $150bn book | $454m | 0.3% | 3,533,955 | +$60m+253,104 | Added |
| D. E. Shaw & Co. Quantitative · $210bn book | $352m | 0.2% | 2,738,023 | -$57m-659,559 | Trimmed |
| Woodline Partners LP Long/short equity · $32.4bn book | $145m | 0.4% | 1,124,149 | +$16m+53,069 | Added |
| Man Group PLC Quantitative · $62.7bn book | $127m | 0.2% | 990,469 | +$32m+197,302 | Added |
| Squarepoint Ops LLC Multi-strategy · $90.5bn book | $117m | 0.1% | 909,676 | +$17m+78,819 | Added |
| Holocene Advisors LP Long/short equity · $44.4bn book | $81m | 0.2% | 628,000 | +$12m+55,533 | Added |
| Farallon Capital Management LLC Long/short equity · $21.7bn book | $26m | 0.1% | 199,000 | -$18m-162,000 | Trimmed |
| Dodge & Cox Value · $191bn book | $17m | 0.0% | 135,750 | +$1.1m-300 | Trimmed |
Sold out of this quarter
Valued at what the position was worth in the previous filing, because by this one it is gone.
- ExodusPoint Capital Management LP · Multi-strategy$17m held before
Ownership through time
At least 25 of the 95 managers whose filings are on file listed MRK in Q2 2026, against 23 in Q2 2013. 5 managers fewer than in Q1 2026: 1 started a position; 6 no longer listed it among the positions read, which can mean a holding below the listed range, a filing that reported no holdings, or a filing not yet made.
Each manager’s largest 500 positions a quarter are read, so a small holding in a very large book can be missing, and a manager is counted as leaving only where its own filing shows it.
- Q2 2013: 23
- Q3 2013: 23
- Q4 2013: 23
- Q1 2014: 23
- Q2 2014: 28
- Q3 2014: 31
- Q4 2014: 29
- Q1 2015: 28
- Q2 2015: 28
- Q3 2015: 25
- Q4 2015: 28
- Q1 2016: 28
- Q2 2016: 27
- Q3 2016: 27
- Q4 2016: 26
- Q1 2017: 31
- Q2 2017: 34
- Q3 2017: 31
- Q4 2017: 32
- Q1 2018: 30
- Q2 2018: 27
- Q3 2018: 27
- Q4 2018: 26
- Q1 2019: 26
- Q2 2019: 28
- Q3 2019: 31
- Q4 2019: 34
- Q1 2020: 33
- Q2 2020: 34
- Q3 2020: 35
- Q4 2020: 34
- Q1 2021: 33
- Q2 2021: 31
- Q3 2021: 31
- Q4 2021: 26
- Q1 2022: 34
- Q2 2022: 34
- Q3 2022: 35
- Q4 2022: 35
- Q1 2023: 33
- Q2 2023: 34
- Q3 2023: 39
- Q4 2023: 41
- Q1 2024: 37
- Q2 2024: 38
- Q3 2024: 38
- Q4 2024: 35
- Q1 2025: 36
- Q2 2025: 31
- Q3 2025: 36
- Q4 2025: 32
- Q1 2026: 30
- Q2 2026: 25
- Q2 2013: $25.9bn
- Q3 2013: $25.3bn
- Q4 2013: $27.1bn
- Q1 2014: $31.1bn
- Q2 2014: $30.6bn
- Q3 2014: $30.4bn
- Q4 2014: $28.5bn
- Q1 2015: $28.8bn
- Q2 2015: $27.0bn
- Q3 2015: $23.0bn
- Q4 2015: $23.9bn
- Q1 2016: $23.8bn
- Q2 2016: $25.9bn
- Q3 2016: $27.5bn
- Q4 2016: $24.4bn
- Q1 2017: $24.7bn
- Q2 2017: $24.0bn
- Q3 2017: $23.7bn
- Q4 2017: $20.0bn
- Q1 2018: $17.5bn
- Q2 2018: $19.3bn
- Q3 2018: $22.9bn
- Q4 2018: $24.4bn
- Q1 2019: $24.4bn
- Q2 2019: $23.3bn
- Q3 2019: $23.2bn
- Q4 2019: $24.0bn
- Q1 2020: $18.5bn
- Q2 2020: $18.6bn
- Q3 2020: $20.2bn
- Q4 2020: $19.1bn
- Q1 2021: $16.6bn
- Q2 2021: $15.1bn
- Q3 2021: $15.2bn
- Q4 2021: $15.0bn
- Q1 2022: $17.4bn
- Q2 2022: $19.0bn
- Q3 2022: $17.2bn
- Q4 2022: $25.2bn
- Q1 2023: $26.6bn
- Q2 2023: $30.1bn
- Q3 2023: $26.7bn
- Q4 2023: $29.3bn
- Q1 2024: $37.1bn
- Q2 2024: $33.0bn
- Q3 2024: $29.1bn
- Q4 2024: $23.7bn
- Q1 2025: $20.8bn
- Q2 2025: $18.5bn
- Q3 2025: $19.0bn
- Q4 2025: $26.8bn
- Q1 2026: $28.9bn
- Q2 2026: $29.2bn
Between the quarter ends of Q1 2026 and Q2 2026. Each change in shares is valued at the Q2 2026 price, so the price’s own move is left out; a 13F shows the two quarter ends, not when in between anything was bought or sold.
Started in Q2 2026
Largest increases, by shares
- Wellington Management Group LLP84,314,971 to 86,249,283 shares+$249m
- AllianceBernstein LP11,301,486 to 13,131,942 shares+$220m
- Arrowstreet Capital LP2,936,330 to 3,966,523 shares+$132m
- Janus Henderson Group Ltd2,880,199 to 3,901,539 shares+$131m
- Fidelity (FMR LLC)44,516,010 to 45,440,355 shares+$119m
Largest decreases, by shares
- T. Rowe Price Associates Inc23,042,842 to 18,518,796 shares-$581m
- Invesco Ltd21,855,101 to 18,611,171 shares-$417m
- Citadel Advisors LLC3,821,227 to 1,933,667 shares-$243m
- Artisan Partners LP1,061,859 to 87,246 shares-$125m
- D. E. Shaw & Co.3,397,582 to 2,738,023 shares-$85m
Left it
No manager on file is shown leaving it.
| Manager | Value over time | First listed | Largest | Q2 2026 |
|---|---|---|---|---|
| Wellington Management Group LLP | Q2 2013 | $11.4bn | $11.1bn | |
| Fidelity (FMR LLC) | Q2 2013 | $6.9bn | $5.8bn | |
| Invesco Ltd | Q2 2013 | $2.6bn | $2.4bn | |
| T. Rowe Price Associates Inc | Q2 2013 | $3.9bn | $2.4bn | |
| AllianceBernstein LP | Q2 2013 | $1.6bn | $1.6bn | |
| Harris Associates LP | Q2 2013 | $1.6bn | $1.6bn | |
| AQR Capital Management LLC | Q2 2013 | $1.2bn | $1.0bn | |
| Arrowstreet Capital LP | Q1 2017 | $1.6bn | $510m | |
| Janus Henderson Group Ltd | Q2 2013 | $2.6bn | $501m | |
| Acadian Asset Management LLC | Q3 2013 | $505m | $475m | |
| Neuberger Berman Group LLC | Q2 2013 | $769m | $454m | |
| D. E. Shaw & Co. | Q2 2013 | $895m | $352m | |
| Citadel Advisors LLC | Q3 2016 | $1.0bn | $248m | |
| Capital Research Global Investors | Q2 2013 | $893m | $247m | |
| Woodline Partners LP | Q3 2020 | $144m | $144m | |
| Capital World Investors | Q2 2013 | $10.4bn | last listed Q4 2024 | |
| MFS Investment Management | Q2 2013 | $2.6bn | last listed Q4 2025 | |
| Berkshire Hathaway Inc | Q3 2020 | $2.3bn | last listed Q2 2021 | |
| Millennium Management LLC | Q2 2013 | $1.3bn | last listed Q1 2026 | |
| Renaissance Technologies LLC | Q4 2013 | $617m | last listed Q4 2024 | |
| Marshall Wace LLP | Q2 2014 | $557m | last listed Q1 2026 | |
| Two Sigma Advisers LP | Q3 2013 | $515m | last listed Q3 2025 | |
| Susquehanna International Group LLP | Q2 2013 | $334m | last listed Q1 2024 | |
| Third Point LLC | Q3 2018 | $319m | last listed Q4 2018 | |
| Jane Street Group LLC | Q2 2014 | $301m | last listed Q2 2024 |
Reported as options rather than shares
A put or a call on a name is not a position in it, and the filing states the notional rather than what the option cost. These lines are listed apart for that reason and are not counted in anything above.
- Jane Street Group LLC · puts$780m notional
- Hudson Bay Capital Management LP · puts$119m notional
- Walleye Capital LLC · calls$26m notional
What MRK is worth
Knowing who owns it is half the question. The other half is what it is worth against the companies it trades beside, which is the one an interviewer will follow up with.
Build the comp set around MRK →How much of the picture this is
A Form 13F reports US-listed long equity and nothing else: no shorts, no bonds, no cash and no non-US listings. It arrives forty-five days after the quarter ends, so a manager who sold in July still shows the position in a filing published in August. This page reads the managers on file here rather than every filer in the market, and each manager’s largest positions rather than the whole table, so a small position in a very large book may not appear. Say “their last filing showed” rather than “they own”, and the distinction will do you credit.
What to do with a name the funds are buying
Knowing who owns something is the start of a pitch, not the pitch. The next questions are what it is worth and why they were buying.
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The holdings, every quarter, and the week between
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