Norges
· Exited
−$4.4B
Change
−38.0M
Δ Own
−100.0%
Date
Q1 2026
MR
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Norges
· Exited
−$4.4B
Change
−38.0M
Δ Own
−100.0%
Date
Q1 2026
|
Norges | Exited· Q1 2026 | −$4.4B | −38.0M | −100.0% | Q1 2026 | |||||
|
JPMorgan Chase & Co
· Added
+$2.7B
Change
+23.8M
Date
Q1 2026
|
JPMorgan Chase & Co | Added· Q1 2026 | +$2.7B | +23.8M | – | Q1 2026 | |||||
|
Arrowstreet Capital, Limited Partnership
· Reduced
−$808M
Change
−7.0M
Date
Q1 2026
|
Arrowstreet Capital, Limited Partnership | Reduced· Q1 2026 | −$808M | −7.0M | – | Q1 2026 | |||||
|
BlackRock
· Added
+$777M
Change
+6.7M
Date
Q1 2026
|
BlackRock | Added· Q1 2026 | +$777M | +6.7M | – | Q1 2026 | |||||
|
UBS Group AG
· Reduced
−$605M
Change
−5.2M
Date
Q1 2026
|
UBS Group AG | Reduced· Q1 2026 | −$605M | −5.2M | – | Q1 2026 | |||||
|
Millennium Management LLC
· Reduced
−$557M
Change
−4.8M
Date
Q1 2026
|
Millennium Management LLC | Reduced· Q1 2026 | −$557M | −4.8M | – | Q1 2026 | |||||
|
Pacer Advisors, Inc.
· Exited
−$502M
Change
−4.4M
Δ Own
−100.0%
Date
Q1 2026
|
Pacer Advisors, Inc. | Exited· Q1 2026 | −$502M | −4.4M | −100.0% | Q1 2026 | |||||
|
T. Rowe Price Associates
· Added
+$495M
Change
+4.3M
Date
Q1 2026
|
T. Rowe Price Associates | Added· Q1 2026 | +$495M | +4.3M | – | Q1 2026 | |||||
|
Massachusetts Financial Services Co
· Reduced
−$478M
Change
−4.1M
Date
Q1 2026
|
Massachusetts Financial Services Co | Reduced· Q1 2026 | −$478M | −4.1M | – | Q1 2026 | |||||
|
Los Angeles Capital Management LLC
· Reduced
−$428M
Change
−3.7M
Date
Q1 2026
|
Los Angeles Capital Management LLC | Reduced· Q1 2026 | −$428M | −3.7M | – | Q1 2026 | |||||
|
FMR LLC
· Added
+$424M
Change
+3.7M
Δ Own
+9.0%
Date
Q1 2026
|
FMR LLC | Added· Q1 2026 | +$424M | +3.7M | +9.0% | Q1 2026 | |||||
|
Nuveen, LLC
· Added
+$362M
Change
+3.1M
Date
Q1 2026
|
Nuveen, LLC | Added· Q1 2026 | +$362M | +3.1M | – | Q1 2026 | |||||
|
Citadel Advisors LLC
· Reduced
−$346M
Change
−3.0M
Δ Own
−44.0%
Date
Q1 2026
|
Citadel Advisors LLC | Reduced· Q1 2026 | −$346M | −3.0M | −44.0% | Q1 2026 | |||||
|
Dimensional
· Added
+$342M
Change
+3.0M
Date
Q1 2026
|
Dimensional | Added· Q1 2026 | +$342M | +3.0M | – | Q1 2026 | |||||
|
Bank of America Corp
· Added
+$337M
Change
+2.9M
Date
Q1 2026
|
Bank of America Corp | Added· Q1 2026 | +$337M | +2.9M | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Seidman Christine E.
· Director
Grant (A)
$8K
|
Seidman Christine E. | Director | Grant (A) | $128.50 | 63 | $8K | 21K | – | Jun 30, 2026 | Jul 1, 2026 | |||||||||
|
Karsanbhai Surendralal Lanca
· Director
Grant (A)
$16K
|
Karsanbhai Surendralal Lanca | Director | Grant (A) | $128.50 | 126 | $16K | 6K | – | Jun 30, 2026 | Jul 1, 2026 | |||||||||
|
Coe Mary Ellen
· Director
Grant (A)
$30K
|
Coe Mary Ellen | Director | Grant (A) | $128.50 | 233 | $30K | 32K | – | Jun 30, 2026 | Jul 1, 2026 | |||||||||
|
Warden Kathy J.
· Director
Grant (A)
$220K
|
Warden Kathy J. | Director | Grant (A) | $118.72 | 2K | $220K | 18K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Karsanbhai Surendralal Lanca
· Director
Grant (A)
$220K
|
Karsanbhai Surendralal Lanca | Director | Grant (A) | $118.72 | 2K | $220K | 5K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Coe Mary Ellen
· Director
Grant (A)
$220K
|
Coe Mary Ellen | Director | Grant (A) | $118.72 | 2K | $220K | 32K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Thulin Inge G.
· Director
Grant (A)
$220K
|
Thulin Inge G. | Director | Grant (A) | $118.72 | 2K | $220K | 27K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Seidman Christine E.
· Director
Grant (A)
$220K
|
Seidman Christine E. | Director | Grant (A) | $118.72 | 2K | $220K | 21K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Russo Patricia F.
· Director
Grant (A)
$220K
|
Russo Patricia F. | Director | Grant (A) | $118.72 | 2K | $220K | 62K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Rothman Paul
· Director
Grant (A)
$220K
|
Rothman Paul | Director | Grant (A) | $118.72 | 2K | $220K | 35K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Mayo Stephen
· Director
Grant (A)
$220K
|
Mayo Stephen | Director | Grant (A) | $118.72 | 2K | $220K | 15K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Lavizzo-Mourey Risa J.
· Director
Grant (A)
$220K
|
Lavizzo-Mourey Risa J. | Director | Grant (A) | $118.72 | 2K | $220K | 18K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Glocer Thomas H.
· Director
Grant (A)
$220K
|
Glocer Thomas H. | Director | Grant (A) | $118.72 | 2K | $220K | 111K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Craig Pamela J.
· Director
Grant (A)
$220K
|
Craig Pamela J. | Director | Grant (A) | $118.72 | 2K | $220K | 35K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Baker Douglas M. Jr
· Director
Grant (A)
$220K
|
Baker Douglas M. Jr | Director | Grant (A) | $118.72 | 2K | $220K | 12K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
A
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A
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3,445 reporting institutions disclosed MRK position changes in the Q1 2026 snapshot.
For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.
An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.
Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.
Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.
A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.