VANGUARD GROUP INC
Rank #1
10.3%
- Shares
- 254.32M
- Change
- +2.19M
- Change %
- +87.00%
- Filing
- Dec 31, 2025
Increased
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
NYSE · HEALTHCARE · Holders
Merck & Company Inc (MRK) Institutional Ownership & Insider Trading History
Top MRK institutional shareholders, filing changes, and Form 4 insider activity with filters for buys, sales, option exercises, gifts, and tax withholding.
Section freshness
Price Jun 26, 4:03 PM EDT · Statements Mar 30, 8:00 PM EDT
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Data freshness
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Price time means the latest available trade or regular-market close. Other times show when that section was checked or published.
PriceLive
Last traded •
Source: Market data provider
Fundamentalsevery 1 day
Provider checked •
Source: Market data provider
Analystevery 1 hr
Provider checked •
Source: Market data provider
Newsevery 15 min
Latest item •
Source: Market data provider
Ownership read
MRK insider sentiment: Mixed, buy-heavy.
VANGUARD GROUP INC is the largest institutional holder. 53 sales and 67 purchases appear in the recent Form 4 filings. Use the filters below to separate real buying and selling from option exercises, gifts, awards, and tax withholding.
Insider flow
MRK
Purchases963.19K
Sales602.19K
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
254.32M
VANGUARD GROUP INC
Insider stance
Mixed, buy-heavy
$43.30M sold / $31.78M bought
Latest filing
May 29, 2026
Most recent holder or insider filing date
Filings shown
240
120 holder / 120 insider
- Holder rows
- 120
- Market data source
- Latest filing
- May 29, 2026
- Most recent holder or insider filing date
- Increased / initiated
- 57
- 60 decreased
- Insider rows
- 120
- Market data source
Top 120 institutional holders
Merck & Company Inc (MRK) institutional ownership
Ranked by reported share count, with position changes and latest filing dates where ownership data supplies them.
BLACKROCK
Rank #2
9.11%
- Shares
- 225.83M
- Change
- +6.73M
- Change %
- +3.07%
- Filing
- Mar 31, 2026
Increased
VANGUARD CAPITAL MANAGEMENT LLC
Rank #3
6.50%
- Shares
- 160.99M
- Change
- +160.99M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
STATE STREET CORP
Rank #4
4.82%
- Shares
- 119.33M
- Change
- -714.50K
- Change %
- -59.00%
- Filing
- Mar 31, 2026
Decreased
WELLINGTON MANAGEMENT GROUP LLP
Rank #5
3.40%
- Shares
- 84.31M
- Change
- -2.12M
- Change %
- -2.45%
- Filing
- Mar 31, 2026
Decreased
VANGUARD PORTFOLIO MANAGEMENT LLC
Rank #6
2.72%
- Shares
- 67.30M
- Change
- +67.30M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
GEODE CAPITAL MANAGEMENT
Rank #7
2.40%
- Shares
- 59.56M
- Change
- -489.83K
- Change %
- -82.00%
- Filing
- Mar 31, 2026
Decreased
JPMORGAN CHASE & CO
Rank #8
2.14%
- Shares
- 52.97M
- Change
- +23.77M
- Change %
- +81.41%
- Filing
- Mar 31, 2026
Increased
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
Rank #9
2.01%
- Shares
- 49.77M
- Change
- +1.20M
- Change %
- +2.47%
- Filing
- Mar 31, 2026
Increased
MORGAN STANLEY
Rank #10
1.92%
- Shares
- 47.63M
- Change
- +2.69M
- Change %
- +5.98%
- Filing
- Mar 31, 2026
Increased
FMR LLC
Rank #11
1.80%
- Shares
- 44.52M
- Change
- +3.68M
- Change %
- +9.01%
- Filing
- Mar 31, 2026
Increased
NORGES BANK
Rank #12
1.53%
- Shares
- 37.98M
- Change
- +1.87M
- Change %
- +5.18%
- Filing
- Dec 31, 2025
Increased
BANK OF AMERICA CORP
Rank #13
1.24%
- Shares
- 30.77M
- Change
- +2.92M
- Change %
- +10.48%
- Filing
- Mar 31, 2026
Increased
NORTHERN TRUST CORP
Rank #14
1.09%
- Shares
- 27.09M
- Change
- -144.62K
- Change %
- -53.00%
- Filing
- Mar 31, 2026
Decreased
FISHER ASSET MANAGEMENT
Rank #15
1.07%
- Shares
- 26.44M
- Change
- +1.56M
- Change %
- +6.28%
- Filing
- Mar 31, 2026
Increased
PRICE T ROWE ASSOCIATES INC
Rank #16
0.93%
- Shares
- 23.04M
- Change
- +4.29M
- Change %
- +22.87%
- Filing
- Mar 31, 2026
Increased
INVESCO LTD.
Rank #17
0.88%
- Shares
- 21.86M
- Change
- +1.31M
- Change %
- +6.37%
- Filing
- Mar 31, 2026
Increased
UBS AM
Rank #18
0.82%
- Shares
- 20.41M
- Change
- +981.42K
- Change %
- +5.05%
- Filing
- Mar 31, 2026
Increased
GOLDMAN SACHS GROUP INC
Rank #19
0.81%
- Shares
- 20.13M
- Change
- +784.66K
- Change %
- +4.05%
- Filing
- Mar 31, 2026
Increased
LEGAL & GENERAL GROUP PLC
Rank #20
0.79%
- Shares
- 19.54M
- Change
- -238.30K
- Change %
- -121.00%
- Filing
- Mar 31, 2026
Decreased
BANK OF NEW YORK MELLON CORP
Rank #21
0.76%
- Shares
- 18.71M
- Change
- -451.16K
- Change %
- -2.35%
- Filing
- Mar 31, 2026
Decreased
FRANKLIN RESOURCES INC
Rank #22
0.66%
- Shares
- 16.27M
- Change
- +203.16K
- Change %
- +126.00%
- Filing
- Mar 31, 2026
Increased
AMERIPRISE FINANCIAL INC
Rank #23
0.66%
- Shares
- 16.26M
- Change
- +288.30K
- Change %
- +1.80%
- Filing
- Mar 31, 2026
Increased
DIMENSIONAL FUND ADVISORS LP
Rank #24
0.62%
- Shares
- 15.46M
- Change
- +2.97M
- Change %
- +23.79%
- Filing
- Mar 31, 2026
Increased
VANGUARD FIDUCIARY TRUST CO
Rank #25
0.56%
- Shares
- 13.96M
- Change
- +13.96M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
UBS GROUP AG
Rank #26
0.56%
- Shares
- 13.93M
- Change
- -5.24M
- Change %
- -27.35%
- Filing
- Mar 31, 2026
Decreased
STATE FARM MUTUAL AUTOMOBILE INSURANCE CO
Rank #27
0.56%
- Shares
- 13.79M
- Change
- —
- Change %
- 0.00%
- Filing
- Mar 31, 2026
Unchanged
AMUNDI
Rank #28
0.56%
- Shares
- 13.76M
- Change
- +379.86K
- Change %
- +2.84%
- Filing
- Mar 31, 2026
Increased
ROYAL BANK OF CANADA
Rank #29
0.53%
- Shares
- 13.20M
- Change
- +11.64K
- Change %
- +9.00%
- Filing
- Mar 31, 2026
Increased
DEUTSCHE BANK AG\
Rank #30
0.51%
- Shares
- 12.54M
- Change
- -247.54K
- Change %
- -1.94%
- Filing
- Mar 31, 2026
Decreased
HARRIS ASSOCIATES L P
Rank #31
0.50%
- Shares
- 12.37M
- Change
- -1.72M
- Change %
- -12.22%
- Filing
- Mar 31, 2026
Decreased
WELLS FARGO & COMPANY
Rank #32
0.46%
- Shares
- 11.45M
- Change
- +398.63K
- Change %
- +3.61%
- Filing
- Mar 31, 2026
Increased
ALLIANCEBERNSTEIN L.P.
Rank #33
0.46%
- Shares
- 11.30M
- Change
- +2.67M
- Change %
- +30.92%
- Filing
- Mar 31, 2026
Increased
NUVEEN
Rank #34
0.41%
- Shares
- 10.10M
- Change
- +3.14M
- Change %
- +45.15%
- Filing
- Mar 31, 2026
Increased
AQR CAPITAL MANAGEMENT LLC
Rank #35
0.35%
- Shares
- 8.63M
- Change
- -2.62M
- Change %
- -23.30%
- Filing
- Mar 31, 2026
Decreased
NORDEA INVESTMENT MANAGEMENT AB
Rank #36
0.34%
- Shares
- 8.53M
- Change
- -2.05M
- Change %
- -19.35%
- Filing
- Mar 31, 2026
Decreased
STIFEL FINANCIAL CORP
Rank #37
0.33%
- Shares
- 8.29M
- Change
- -255.24K
- Change %
- -2.99%
- Filing
- Mar 31, 2026
Decreased
BARROW HANLEY MEWHINNEY & STRAUSS LLC
Rank #38
0.32%
- Shares
- 7.92M
- Change
- +124.69K
- Change %
- +1.60%
- Filing
- Mar 31, 2026
Increased
HSBC HOLDINGS PLC
Rank #39
0.31%
- Shares
- 7.63M
- Change
- -441.34K
- Change %
- -5.46%
- Filing
- Mar 31, 2026
Decreased
BARCLAYS PLC
Rank #40
0.30%
- Shares
- 7.56M
- Change
- +2.78M
- Change %
- +58.32%
- Filing
- Mar 31, 2026
Increased
PNC FINANCIAL SERVICES GROUP
Rank #41
0.30%
- Shares
- 7.53M
- Change
- -91.39K
- Change %
- -120.00%
- Filing
- Mar 31, 2026
Decreased
CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM
Rank #42
0.30%
- Shares
- 7.38M
- Change
- -1.19M
- Change %
- -13.83%
- Filing
- Mar 31, 2026
Decreased
SWISS NATIONAL BANK
Rank #43
0.29%
- Shares
- 7.28M
- Change
- +440.70K
- Change %
- +6.44%
- Filing
- Mar 31, 2026
Increased
SWEDBANK AB
Rank #44
0.29%
- Shares
- 7.09M
- Change
- -559.96K
- Change %
- -7.32%
- Filing
- Mar 31, 2026
Decreased
GRANTHAM
Rank #45
0.28%
- Shares
- 7.01M
- Change
- +143.63K
- Change %
- +2.09%
- Filing
- Mar 31, 2026
Increased
ARISTOTLE CAPITAL MANAGEMENT
Rank #46
0.28%
- Shares
- 6.89M
- Change
- -386.46K
- Change %
- -5.31%
- Filing
- Mar 31, 2026
Decreased
RAYMOND JAMES FINANCIAL INC
Rank #47
0.27%
- Shares
- 6.59M
- Change
- -343.14K
- Change %
- -4.95%
- Filing
- Mar 31, 2026
Decreased
SUMITOMO MITSUI TRUST GROUP
Rank #48
0.25%
- Shares
- 6.27M
- Change
- -702.49K
- Change %
- -10.08%
- Filing
- Mar 31, 2026
Decreased
JENNISON ASSOCIATES LLC
Rank #49
0.25%
- Shares
- 6.25M
- Change
- +689.85K
- Change %
- +12.41%
- Filing
- Mar 31, 2026
Increased
MITSUBISHI UFJ ASSET MANAGEMENT CO.
Rank #50
0.23%
- Shares
- 5.78M
- Change
- +370.90K
- Change %
- +6.85%
- Filing
- Mar 31, 2026
Increased
NATIONAL PENSION SERVICE
Rank #51
0.23%
- Shares
- 5.76M
- Change
- -27.34K
- Change %
- -47.00%
- Filing
- Mar 31, 2026
Decreased
VANGUARD GLOBAL ADVISERS
Rank #52
0.23%
- Shares
- 5.59M
- Change
- +5.59M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
AMERICAN CENTURY COMPANIES INC
Rank #53
0.22%
- Shares
- 5.55M
- Change
- +179.25K
- Change %
- +3.34%
- Filing
- Mar 31, 2026
Increased
DEKABANK DEUTSCHE GIROZENTRALE
Rank #54
0.22%
- Shares
- 5.43M
- Change
- —
- Change %
- 0.00%
- Filing
- Mar 31, 2026
Unchanged
VOYA INVESTMENT MANAGEMENT LLC
Rank #55
0.21%
- Shares
- 5.16M
- Change
- +2.17M
- Change %
- +72.75%
- Filing
- Mar 31, 2026
Increased
LSV ASSET MANAGEMENT
Rank #56
0.21%
- Shares
- 5.09M
- Change
- -85.72K
- Change %
- -1.66%
- Filing
- Mar 31, 2026
Decreased
VANGUARD ASSET MANAGEMENT
Rank #57
0.20%
- Shares
- 5.00M
- Change
- +5.00M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
BANK OF MONTREAL
Rank #58
0.19%
- Shares
- 4.83M
- Change
- -541.04K
- Change %
- -10.07%
- Filing
- Mar 31, 2026
Decreased
PRINCIPAL FINANCIAL GROUP INC
Rank #59
0.19%
- Shares
- 4.71M
- Change
- -372.78K
- Change %
- -7.33%
- Filing
- Mar 31, 2026
Decreased
ABERDEEN GROUP PLC
Rank #60
0.19%
- Shares
- 4.67M
- Change
- +14.19K
- Change %
- +30.00%
- Filing
- Mar 31, 2026
Increased
CAPITAL WEALTH PLANNING
Rank #61
0.18%
- Shares
- 4.52M
- Change
- -487.47K
- Change %
- -9.74%
- Filing
- Mar 31, 2026
Decreased
FIRST TRUST ADVISORS LP
Rank #62
0.18%
- Shares
- 4.47M
- Change
- -162.79K
- Change %
- -3.52%
- Filing
- Mar 31, 2026
Decreased
ACADIAN ASSET MANAGEMENT LLC
Rank #63
0.17%
- Shares
- 4.20M
- Change
- +2.61M
- Change %
- +163.53%
- Filing
- Mar 31, 2026
Increased
ALLIANZ ASSET MANAGEMENT GMBH
Rank #64
0.16%
- Shares
- 3.96M
- Change
- -1.94K
- Change %
- -5.00%
- Filing
- Mar 31, 2026
Decreased
ENVESTNET ASSET MANAGEMENT INC
Rank #65
0.16%
- Shares
- 3.85M
- Change
- +648.64K
- Change %
- +20.24%
- Filing
- Mar 31, 2026
Increased
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM
Rank #66
0.15%
- Shares
- 3.84M
- Change
- -110.51K
- Change %
- -2.80%
- Filing
- Mar 31, 2026
Decreased
CITADEL ADVISORS LLC
Rank #67
0.15%
- Shares
- 3.82M
- Change
- -3.00M
- Change %
- -43.98%
- Filing
- Mar 31, 2026
Decreased
CAISSE DE DEPOT ET PLACEMENT DU QUEBEC
Rank #68
0.15%
- Shares
- 3.80M
- Change
- -332.08K
- Change %
- -8.04%
- Filing
- Mar 31, 2026
Decreased
RHUMBLINE ADVISERS
Rank #69
0.15%
- Shares
- 3.80M
- Change
- -178.84K
- Change %
- -4.50%
- Filing
- Mar 31, 2026
Decreased
VICTORY CAPITAL MANAGEMENT INC
Rank #70
0.15%
- Shares
- 3.79M
- Change
- -1.02M
- Change %
- -21.19%
- Filing
- Mar 31, 2026
Decreased
LPL FINANCIAL LLC
Rank #71
0.15%
- Shares
- 3.78M
- Change
- +226.19K
- Change %
- +6.36%
- Filing
- Mar 31, 2026
Increased
THORNBURG INVESTMENT MANAGEMENT INC
Rank #72
0.15%
- Shares
- 3.73M
- Change
- —
- Change %
- 0.00%
- Filing
- Mar 31, 2026
Unchanged
BANK JULIUS BAER & CO. LTD
Rank #73
0.15%
- Shares
- 3.70M
- Change
- +536.89K
- Change %
- +16.97%
- Filing
- Mar 31, 2026
Increased
HIGHTOWER ADVISORS
Rank #74
0.15%
- Shares
- 3.64M
- Change
- -182.73K
- Change %
- -4.79%
- Filing
- Mar 31, 2026
Decreased
CANADA PENSION PLAN INVESTMENT BOARD
Rank #75
0.15%
- Shares
- 3.62M
- Change
- -697.73K
- Change %
- -16.17%
- Filing
- Mar 31, 2026
Decreased
NEW YORK STATE COMMON RETIREMENT FUND
Rank #76
0.14%
- Shares
- 3.52M
- Change
- -40.03K
- Change %
- -113.00%
- Filing
- Mar 31, 2026
Decreased
D. E. SHAW & CO.
Rank #77
0.14%
- Shares
- 3.40M
- Change
- -120.88K
- Change %
- -3.44%
- Filing
- Mar 31, 2026
Decreased
NEUBERGER BERMAN GROUP LLC
Rank #78
0.13%
- Shares
- 3.28M
- Change
- +240.95K
- Change %
- +7.93%
- Filing
- Mar 31, 2026
Increased
LAZARD ASSET MANAGEMENT LLC
Rank #79
0.13%
- Shares
- 3.25M
- Change
- -1.15M
- Change %
- -26.16%
- Filing
- Mar 31, 2026
Decreased
AVIVA PLC
Rank #80
0.13%
- Shares
- 3.24M
- Change
- +349.22K
- Change %
- +12.10%
- Filing
- Mar 31, 2026
Increased
BEUTEL
Rank #81
0.12%
- Shares
- 3.03M
- Change
- -1.03M
- Change %
- -25.42%
- Filing
- Mar 31, 2026
Decreased
FEDERATED HERMES
Rank #82
0.12%
- Shares
- 3.01M
- Change
- +516.06K
- Change %
- +20.71%
- Filing
- Mar 31, 2026
Increased
CANADA LIFE ASSURANCE CO
Rank #83
0.12%
- Shares
- 2.97M
- Change
- +3.73K
- Change %
- +13.00%
- Filing
- Mar 31, 2026
Increased
NATIXIS ADVISORS
Rank #84
0.12%
- Shares
- 2.97M
- Change
- +442.71K
- Change %
- +17.52%
- Filing
- Mar 31, 2026
Increased
ARROWSTREET CAPITAL
Rank #85
0.12%
- Shares
- 2.94M
- Change
- -7.01M
- Change %
- -70.47%
- Filing
- Mar 31, 2026
Decreased
ROYAL LONDON ASSET MANAGEMENT LTD
Rank #86
0.12%
- Shares
- 2.90M
- Change
- -301.00K
- Change %
- -9.41%
- Filing
- Mar 31, 2026
Decreased
JANUS HENDERSON GROUP PLC
Rank #87
0.12%
- Shares
- 2.88M
- Change
- +995.06K
- Change %
- +52.78%
- Filing
- Mar 31, 2026
Increased
EURIZON CAPITAL SGR S.P.A.
Rank #88
0.11%
- Shares
- 2.82M
- Change
- +311.35K
- Change %
- +12.40%
- Filing
- Mar 31, 2026
Increased
MARINER
Rank #89
0.11%
- Shares
- 2.80M
- Change
- +41.99K
- Change %
- +1.52%
- Filing
- Mar 31, 2026
Increased
CITIGROUP INC
Rank #90
0.11%
- Shares
- 2.78M
- Change
- +143.00K
- Change %
- +5.42%
- Filing
- Mar 31, 2026
Increased
MARSHALL WACE
Rank #91
0.11%
- Shares
- 2.78M
- Change
- -1.19M
- Change %
- -30.01%
- Filing
- Mar 31, 2026
Decreased
ADAGE CAPITAL PARTNERS GP
Rank #92
0.11%
- Shares
- 2.69M
- Change
- -411
- Change %
- -1.00%
- Filing
- Mar 31, 2026
Decreased
JONES FINANCIAL COMPANIES LLLP
Rank #93
0.11%
- Shares
- 2.66M
- Change
- +1.78M
- Change %
- +202.32%
- Filing
- Mar 31, 2026
Increased
ENSIGN PEAK ADVISORS
Rank #94
0.11%
- Shares
- 2.61M
- Change
- +774.77K
- Change %
- +42.15%
- Filing
- Mar 31, 2026
Increased
RUSSELL INVESTMENTS GROUP
Rank #95
0.10%
- Shares
- 2.53M
- Change
- -685.24K
- Change %
- -21.34%
- Filing
- Mar 31, 2026
Decreased
MACKENZIE FINANCIAL CORP
Rank #96
0.10%
- Shares
- 2.52M
- Change
- +1.05M
- Change %
- +71.84%
- Filing
- Mar 31, 2026
Increased
SMEAD CAPITAL MANAGEMENT
Rank #97
0.10%
- Shares
- 2.47M
- Change
- -366.90K
- Change %
- -12.93%
- Filing
- Mar 31, 2026
Decreased
CORIENT PRIVATE WEALTH LLC
Rank #98
0.10%
- Shares
- 2.43M
- Change
- -4.96K
- Change %
- -20.00%
- Filing
- Mar 31, 2026
Decreased
THRIVENT FINANCIAL FOR LUTHERANS
Rank #99
0.09%
- Shares
- 2.35M
- Change
- -55.72K
- Change %
- -2.31%
- Filing
- Mar 31, 2026
Decreased
ROBECO INSTITUTIONAL ASSET MANAGEMENT B.V.
Rank #100
0.09%
- Shares
- 2.32M
- Change
- -175.68K
- Change %
- -7.03%
- Filing
- Mar 31, 2026
Decreased
| # | Institution | % held | Shares | Change | Change % | Filing date |
|---|---|---|---|---|---|---|
| 1 | 10.3% | 254.32M | +2.19M Increased | +87.00% | Dec 31, 2025 | |
| 2 | 9.11% | 225.83M | +6.73M Increased | +3.07% | Mar 31, 2026 | |
| 3 | 6.50% | 160.99M | +160.99M Initiated | — | Mar 31, 2026 | |
| 4 | 4.82% | 119.33M | -714.50K Decreased | -59.00% | Mar 31, 2026 | |
| 5 | 3.40% | 84.31M | -2.12M Decreased | -2.45% | Mar 31, 2026 | |
| 6 | 2.72% | 67.30M | +67.30M Initiated | — | Mar 31, 2026 | |
| 7 | 2.40% | 59.56M | -489.83K Decreased | -82.00% | Mar 31, 2026 | |
| 8 | 2.14% | 52.97M | +23.77M Increased | +81.41% | Mar 31, 2026 | |
| 9 | 2.01% | 49.77M | +1.20M Increased | +2.47% | Mar 31, 2026 | |
| 10 | 1.92% | 47.63M | +2.69M Increased | +5.98% | Mar 31, 2026 | |
| 11 | 1.80% | 44.52M | +3.68M Increased | +9.01% | Mar 31, 2026 | |
| 12 | 1.53% | 37.98M | +1.87M Increased | +5.18% | Dec 31, 2025 | |
| 13 | 1.24% | 30.77M | +2.92M Increased | +10.48% | Mar 31, 2026 | |
| 14 | 1.09% | 27.09M | -144.62K Decreased | -53.00% | Mar 31, 2026 | |
| 15 | FISHER ASSET MANAGEMENT | 1.07% | 26.44M | +1.56M Increased | +6.28% | Mar 31, 2026 |
| 16 | 0.93% | 23.04M | +4.29M Increased | +22.87% | Mar 31, 2026 | |
| 17 | 0.88% | 21.86M | +1.31M Increased | +6.37% | Mar 31, 2026 | |
| 18 | 0.82% | 20.41M | +981.42K Increased | +5.05% | Mar 31, 2026 | |
| 19 | 0.81% | 20.13M | +784.66K Increased | +4.05% | Mar 31, 2026 | |
| 20 | 0.79% | 19.54M | -238.30K Decreased | -121.00% | Mar 31, 2026 | |
| 21 | BANK OF NEW YORK MELLON CORP | 0.76% | 18.71M | -451.16K Decreased | -2.35% | Mar 31, 2026 |
| 22 | 0.66% | 16.27M | +203.16K Increased | +126.00% | Mar 31, 2026 | |
| 23 | AMERIPRISE FINANCIAL INC | 0.66% | 16.26M | +288.30K Increased | +1.80% | Mar 31, 2026 |
| 24 | 0.62% | 15.46M | +2.97M Increased | +23.79% | Mar 31, 2026 | |
| 25 | 0.56% | 13.96M | +13.96M Initiated | — | Mar 31, 2026 | |
| 26 | 0.56% | 13.93M | -5.24M Decreased | -27.35% | Mar 31, 2026 | |
| 27 | STATE FARM MUTUAL AUTOMOBILE INSURANCE CO | 0.56% | 13.79M | — Unchanged | 0.00% | Mar 31, 2026 |
| 28 | 0.56% | 13.76M | +379.86K Increased | +2.84% | Mar 31, 2026 | |
| 29 | ROYAL BANK OF CANADA | 0.53% | 13.20M | +11.64K Increased | +9.00% | Mar 31, 2026 |
| 30 | DEUTSCHE BANK AG\ | 0.51% | 12.54M | -247.54K Decreased | -1.94% | Mar 31, 2026 |
| 31 | HARRIS ASSOCIATES L P | 0.50% | 12.37M | -1.72M Decreased | -12.22% | Mar 31, 2026 |
| 32 | WELLS FARGO & COMPANY | 0.46% | 11.45M | +398.63K Increased | +3.61% | Mar 31, 2026 |
| 33 | 0.46% | 11.30M | +2.67M Increased | +30.92% | Mar 31, 2026 | |
| 34 | NUVEEN | 0.41% | 10.10M | +3.14M Increased | +45.15% | Mar 31, 2026 |
| 35 | AQR CAPITAL MANAGEMENT LLC | 0.35% | 8.63M | -2.62M Decreased | -23.30% | Mar 31, 2026 |
| 36 | NORDEA INVESTMENT MANAGEMENT AB | 0.34% | 8.53M | -2.05M Decreased | -19.35% | Mar 31, 2026 |
| 37 | STIFEL FINANCIAL CORP | 0.33% | 8.29M | -255.24K Decreased | -2.99% | Mar 31, 2026 |
| 38 | BARROW HANLEY MEWHINNEY & STRAUSS LLC | 0.32% | 7.92M | +124.69K Increased | +1.60% | Mar 31, 2026 |
| 39 | HSBC HOLDINGS PLC | 0.31% | 7.63M | -441.34K Decreased | -5.46% | Mar 31, 2026 |
| 40 | BARCLAYS PLC | 0.30% | 7.56M | +2.78M Increased | +58.32% | Mar 31, 2026 |
| 41 | PNC FINANCIAL SERVICES GROUP | 0.30% | 7.53M | -91.39K Decreased | -120.00% | Mar 31, 2026 |
| 42 | CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM | 0.30% | 7.38M | -1.19M Decreased | -13.83% | Mar 31, 2026 |
| 43 | SWISS NATIONAL BANK | 0.29% | 7.28M | +440.70K Increased | +6.44% | Mar 31, 2026 |
| 44 | SWEDBANK AB | 0.29% | 7.09M | -559.96K Decreased | -7.32% | Mar 31, 2026 |
| 45 | GRANTHAM | 0.28% | 7.01M | +143.63K Increased | +2.09% | Mar 31, 2026 |
| 46 | ARISTOTLE CAPITAL MANAGEMENT | 0.28% | 6.89M | -386.46K Decreased | -5.31% | Mar 31, 2026 |
| 47 | RAYMOND JAMES FINANCIAL INC | 0.27% | 6.59M | -343.14K Decreased | -4.95% | Mar 31, 2026 |
| 48 | SUMITOMO MITSUI TRUST GROUP | 0.25% | 6.27M | -702.49K Decreased | -10.08% | Mar 31, 2026 |
| 49 | 0.25% | 6.25M | +689.85K Increased | +12.41% | Mar 31, 2026 | |
| 50 | MITSUBISHI UFJ ASSET MANAGEMENT CO. | 0.23% | 5.78M | +370.90K Increased | +6.85% | Mar 31, 2026 |
| 51 | NATIONAL PENSION SERVICE | 0.23% | 5.76M | -27.34K Decreased | -47.00% | Mar 31, 2026 |
| 52 | 0.23% | 5.59M | +5.59M Initiated | — | Mar 31, 2026 | |
| 53 | AMERICAN CENTURY COMPANIES INC | 0.22% | 5.55M | +179.25K Increased | +3.34% | Mar 31, 2026 |
| 54 | DEKABANK DEUTSCHE GIROZENTRALE | 0.22% | 5.43M | — Unchanged | 0.00% | Mar 31, 2026 |
| 55 | VOYA INVESTMENT MANAGEMENT LLC | 0.21% | 5.16M | +2.17M Increased | +72.75% | Mar 31, 2026 |
| 56 | LSV ASSET MANAGEMENT | 0.21% | 5.09M | -85.72K Decreased | -1.66% | Mar 31, 2026 |
| 57 | 0.20% | 5.00M | +5.00M Initiated | — | Mar 31, 2026 | |
| 58 | BANK OF MONTREAL | 0.19% | 4.83M | -541.04K Decreased | -10.07% | Mar 31, 2026 |
| 59 | PRINCIPAL FINANCIAL GROUP INC | 0.19% | 4.71M | -372.78K Decreased | -7.33% | Mar 31, 2026 |
| 60 | ABERDEEN GROUP PLC | 0.19% | 4.67M | +14.19K Increased | +30.00% | Mar 31, 2026 |
| 61 | CAPITAL WEALTH PLANNING | 0.18% | 4.52M | -487.47K Decreased | -9.74% | Mar 31, 2026 |
| 62 | FIRST TRUST ADVISORS LP | 0.18% | 4.47M | -162.79K Decreased | -3.52% | Mar 31, 2026 |
| 63 | ACADIAN ASSET MANAGEMENT LLC | 0.17% | 4.20M | +2.61M Increased | +163.53% | Mar 31, 2026 |
| 64 | ALLIANZ ASSET MANAGEMENT GMBH | 0.16% | 3.96M | -1.94K Decreased | -5.00% | Mar 31, 2026 |
| 65 | ENVESTNET ASSET MANAGEMENT INC | 0.16% | 3.85M | +648.64K Increased | +20.24% | Mar 31, 2026 |
| 66 | CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | 0.15% | 3.84M | -110.51K Decreased | -2.80% | Mar 31, 2026 |
| 67 | CITADEL ADVISORS LLC | 0.15% | 3.82M | -3.00M Decreased | -43.98% | Mar 31, 2026 |
| 68 | CAISSE DE DEPOT ET PLACEMENT DU QUEBEC | 0.15% | 3.80M | -332.08K Decreased | -8.04% | Mar 31, 2026 |
| 69 | RHUMBLINE ADVISERS | 0.15% | 3.80M | -178.84K Decreased | -4.50% | Mar 31, 2026 |
| 70 | VICTORY CAPITAL MANAGEMENT INC | 0.15% | 3.79M | -1.02M Decreased | -21.19% | Mar 31, 2026 |
| 71 | LPL FINANCIAL LLC | 0.15% | 3.78M | +226.19K Increased | +6.36% | Mar 31, 2026 |
| 72 | THORNBURG INVESTMENT MANAGEMENT INC | 0.15% | 3.73M | — Unchanged | 0.00% | Mar 31, 2026 |
| 73 | BANK JULIUS BAER & CO. LTD | 0.15% | 3.70M | +536.89K Increased | +16.97% | Mar 31, 2026 |
| 74 | HIGHTOWER ADVISORS | 0.15% | 3.64M | -182.73K Decreased | -4.79% | Mar 31, 2026 |
| 75 | CANADA PENSION PLAN INVESTMENT BOARD | 0.15% | 3.62M | -697.73K Decreased | -16.17% | Mar 31, 2026 |
| 76 | NEW YORK STATE COMMON RETIREMENT FUND | 0.14% | 3.52M | -40.03K Decreased | -113.00% | Mar 31, 2026 |
| 77 | 0.14% | 3.40M | -120.88K Decreased | -3.44% | Mar 31, 2026 | |
| 78 | NEUBERGER BERMAN GROUP LLC | 0.13% | 3.28M | +240.95K Increased | +7.93% | Mar 31, 2026 |
| 79 | LAZARD ASSET MANAGEMENT LLC | 0.13% | 3.25M | -1.15M Decreased | -26.16% | Mar 31, 2026 |
| 80 | AVIVA PLC | 0.13% | 3.24M | +349.22K Increased | +12.10% | Mar 31, 2026 |
| 81 | BEUTEL | 0.12% | 3.03M | -1.03M Decreased | -25.42% | Mar 31, 2026 |
| 82 | FEDERATED HERMES | 0.12% | 3.01M | +516.06K Increased | +20.71% | Mar 31, 2026 |
| 83 | CANADA LIFE ASSURANCE CO | 0.12% | 2.97M | +3.73K Increased | +13.00% | Mar 31, 2026 |
| 84 | NATIXIS ADVISORS | 0.12% | 2.97M | +442.71K Increased | +17.52% | Mar 31, 2026 |
| 85 | ARROWSTREET CAPITAL | 0.12% | 2.94M | -7.01M Decreased | -70.47% | Mar 31, 2026 |
| 86 | ROYAL LONDON ASSET MANAGEMENT LTD | 0.12% | 2.90M | -301.00K Decreased | -9.41% | Mar 31, 2026 |
| 87 | JANUS HENDERSON GROUP PLC | 0.12% | 2.88M | +995.06K Increased | +52.78% | Mar 31, 2026 |
| 88 | EURIZON CAPITAL SGR S.P.A. | 0.11% | 2.82M | +311.35K Increased | +12.40% | Mar 31, 2026 |
| 89 | MARINER | 0.11% | 2.80M | +41.99K Increased | +1.52% | Mar 31, 2026 |
| 90 | CITIGROUP INC | 0.11% | 2.78M | +143.00K Increased | +5.42% | Mar 31, 2026 |
| 91 | MARSHALL WACE | 0.11% | 2.78M | -1.19M Decreased | -30.01% | Mar 31, 2026 |
| 92 | ADAGE CAPITAL PARTNERS GP | 0.11% | 2.69M | -411 Decreased | -1.00% | Mar 31, 2026 |
| 93 | JONES FINANCIAL COMPANIES LLLP | 0.11% | 2.66M | +1.78M Increased | +202.32% | Mar 31, 2026 |
| 94 | ENSIGN PEAK ADVISORS | 0.11% | 2.61M | +774.77K Increased | +42.15% | Mar 31, 2026 |
| 95 | RUSSELL INVESTMENTS GROUP | 0.10% | 2.53M | -685.24K Decreased | -21.34% | Mar 31, 2026 |
| 96 | MACKENZIE FINANCIAL CORP | 0.10% | 2.52M | +1.05M Increased | +71.84% | Mar 31, 2026 |
| 97 | SMEAD CAPITAL MANAGEMENT | 0.10% | 2.47M | -366.90K Decreased | -12.93% | Mar 31, 2026 |
| 98 | CORIENT PRIVATE WEALTH LLC | 0.10% | 2.43M | -4.96K Decreased | -20.00% | Mar 31, 2026 |
| 99 | THRIVENT FINANCIAL FOR LUTHERANS | 0.09% | 2.35M | -55.72K Decreased | -2.31% | Mar 31, 2026 |
| 100 | ROBECO INSTITUTIONAL ASSET MANAGEMENT B.V. | 0.09% | 2.32M | -175.68K Decreased | -7.03% | Mar 31, 2026 |
Showing 100 of 120 matching institutional rows.Load more institutions
Recent insider transactions
Merck & Company Inc (MRK) Form 4 filings
Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding.
KARSANBHAI, SURENDRALAL LANCA
Director
- Shares
- 1.85K
- % company
- <0.01%
- Price
- $118.72
- Value
- $220,000
Filed May 29, 2026
COE, MARY ELLEN
Director
- Shares
- 1.85K
- % company
- <0.01%
- Price
- $118.72
- Value
- $220,000
Filed May 29, 2026
THULIN, INGE G
Director
- Shares
- 1.85K
- % company
- <0.01%
- Price
- $118.72
- Value
- $220,000
Filed May 29, 2026
SEIDMAN, CHRISTINE E
Director
- Shares
- 1.85K
- % company
- <0.01%
- Price
- $118.72
- Value
- $220,000
Filed May 29, 2026
RUSSO, PATRICIA F
Director
- Shares
- 1.85K
- % company
- <0.01%
- Price
- $118.72
- Value
- $220,000
Filed May 29, 2026
WARDEN, KATHY J
Director
- Shares
- 1.85K
- % company
- <0.01%
- Price
- $118.72
- Value
- $220,000
Filed May 29, 2026
BAKER, DOUGLAS M JR
Director
- Shares
- 1.85K
- % company
- <0.01%
- Price
- $118.72
- Value
- $220,000
Filed May 29, 2026
CRAIG, PAMELA J.
Director
- Shares
- 1.85K
- % company
- <0.01%
- Price
- $118.72
- Value
- $220,000
Filed May 29, 2026
GLOCER, THOMAS H
Director
- Shares
- 1.85K
- % company
- <0.01%
- Price
- $118.72
- Value
- $220,000
Filed May 29, 2026
LAVIZZO-MOUREY, RISA J
Director
- Shares
- 1.85K
- % company
- <0.01%
- Price
- $118.72
- Value
- $220,000
Filed May 29, 2026
MAYO, STEPHEN
Director
- Shares
- 1.85K
- % company
- <0.01%
- Price
- $118.72
- Value
- $220,000
Filed May 29, 2026
ROTHMAN, PAUL
Director
- Shares
- 1.85K
- % company
- <0.01%
- Price
- $118.72
- Value
- $220,000
Filed May 29, 2026
| # | Insider | % company | Action | Shares | Price | Value | Filing date |
|---|---|---|---|---|---|---|---|
| 1 | KARSANBHAI, SURENDRALAL LANCA Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.85K | $118.72 | $220,000 | May 29, 2026 |
| 2 | COE, MARY ELLEN Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.85K | $118.72 | $220,000 | May 29, 2026 |
| 3 | THULIN, INGE G Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.85K | $118.72 | $220,000 | May 29, 2026 |
| 4 | SEIDMAN, CHRISTINE E Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.85K | $118.72 | $220,000 | May 29, 2026 |
| 5 | RUSSO, PATRICIA F Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.85K | $118.72 | $220,000 | May 29, 2026 |
| 6 | WARDEN, KATHY J Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.85K | $118.72 | $220,000 | May 29, 2026 |
| 7 | BAKER, DOUGLAS M JR Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.85K | $118.72 | $220,000 | May 29, 2026 |
| 8 | CRAIG, PAMELA J. Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.85K | $118.72 | $220,000 | May 29, 2026 |
| 9 | GLOCER, THOMAS H Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.85K | $118.72 | $220,000 | May 29, 2026 |
| 10 | LAVIZZO-MOUREY, RISA J Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.85K | $118.72 | $220,000 | May 29, 2026 |
| 11 | MAYO, STEPHEN Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.85K | $118.72 | $220,000 | May 29, 2026 |
| 12 | ROTHMAN, PAUL Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.85K | $118.72 | $220,000 | May 29, 2026 |
Showing 12 of 120 matching Form 4 rows. Percent of company uses current shares outstanding when available.Load more insiders
Frequently asked
Common questions.
Who are the largest MRK shareholders?
VANGUARD GROUP INC is the largest institutional holder of MRK, with 254.32 million shares, or about 10.26% of shares outstanding. Additional institutions are ranked by reported share count.
What is institutional ownership of MRK?
Merck & Company Inc (MRK) has 120 institutional holders on file — 57 that increased or initiated positions and 60 that reduced them, as of the latest filing on Mar 31, 2026.
Where can I see Merck & Company Inc insider transactions?
Merck & Company Inc (MRK) has 120 Form 4 insider transactions on file, most recently on May 29, 2026, separated into purchases, sales, option exercises, awards, gifts, and tax withholding so administrative transactions are distinguished from open-market trades.
Are MRK insiders buying or selling?
Recent MRK insider activity reads Mixed, buy-heavy: 53 sales and 67 purchases. Awards, gifts, conversions, and tax withholding are listed separately because they do not carry the same signal as open-market trades.
Who is the most active MRK insider?
ZACHARY, JENNIFER is the most active MRK insider by absolute share movement, with 419,451 shares moving across the filing history. Review the action labels before treating that activity as buying or selling.