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
Source timingDetailsHide
Data freshness
Prices update fastest. Fundamentals, analyst data, and news update on their own schedules, so check these timestamps before comparing signals.
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
| # | 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 |
Showing 20 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
DELUCA, RICHARD R.
EVP&Pres, Merck Animal Heallth
- Shares
- 34.92K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
DAVIS, ROBERT M
Director, Chairman, CEO & President
- Shares
- 47.72K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
DAVIS, ROBERT M
Director, Chairman, CEO & President
- Shares
- 139.70K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
FOARD, BRIAN
EVP, Specialty, Pharma, & ID
- Shares
- 10.61K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
FOARD, BRIAN
EVP, Specialty, Pharma, & ID
- Shares
- 35.35K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
FOARD, BRIAN
EVP, Specialty, Pharma, & ID
- Shares
- 31.04K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
MARALDO, DAVID R.
EVP & Pres. MMD
- Shares
- 7.42K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
MARALDO, DAVID R.
EVP & Pres. MMD
- Shares
- 21.73K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
OOSTHUIZEN, JOHANNES JACOBUS
EVP, Oncology & Int?l
- Shares
- 31.04K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
ZACHARY, JENNIFER
EVP, General Counsel
- Shares
- 12.06K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
ZACHARY, JENNIFER
EVP, General Counsel
- Shares
- 35.31K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
WILLIAMS, DAVID MICHAEL
EVP,Chief Info&Digital Officer
- Shares
- 4.64K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
WILLIAMS, DAVID MICHAEL
EVP,Chief Info&Digital Officer
- Shares
- 13.58K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
LITCHFIELD, CAROLINE
EVP & CFO
- Shares
- 15.91K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
LITCHFIELD, CAROLINE
EVP & CFO
- Shares
- 46.57K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
LI, DEAN Y
Executive VP & President, MRL
- Shares
- 19.89K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
LI, DEAN Y
Executive VP & President, MRL
- Shares
- 58.21K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
LARSON, BETTY D
EVP, Chief HR Officer
- Shares
- 7.95K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
LARSON, BETTY D
EVP, Chief HR Officer
- Shares
- 23.28K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
DELUCA, RICHARD R.
EVP&Pres, Merck Animal Heallth
- Shares
- 11.93K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
GUINDO, CHIRFI
EVP, Access, Policy & Comms
- Shares
- 19.40K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
GUINDO, CHIRFI
EVP, Access, Policy & Comms
- Shares
- 6.63K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 5.04K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 2.30K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
OOSTHUIZEN, JOHANNES JACOBUS
EVP, Oncology & Int?l
- Shares
- 10.61K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 5, 2026
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 383
- % company
- <0.01%
- Price
- $112.16
- Value
- $42,957
Filed May 2, 2026
MARALDO, DAVID R.
EVP & Pres. MMD
- Shares
- 552
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 2, 2026
MARALDO, DAVID R.
EVP & Pres. MMD
- Shares
- 159
- % company
- <0.01%
- Price
- $112.16
- Value
- $17,833
Filed May 2, 2026
MARALDO, DAVID R.
EVP & Pres. MMD
- Shares
- 552
- % company
- <0.01%
- Price
- $112.16
- Value
- $61,912
Filed May 2, 2026
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 383
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 2, 2026
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 132
- % company
- <0.01%
- Price
- $112.16
- Value
- $14,805
Filed May 2, 2026
LARSON, BETTY D
EVP, Chief HR Officer
- Shares
- 5.14K
- % company
- <0.01%
- Price
- $110.95
- Value
- $570,616
Filed Apr 30, 2026
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 464
- % company
- <0.01%
- Price
- $110.95
- Value
- $51,481
Filed Apr 30, 2026
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 159
- % company
- <0.01%
- Price
- $110.95
- Value
- $17,641
Filed Apr 30, 2026
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 464
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 30, 2026
LARSON, BETTY D
EVP, Chief HR Officer
- Shares
- 11.35K
- % company
- <0.01%
- Price
- $110.95
- Value
- $1,259,283
Filed Apr 30, 2026
LARSON, BETTY D
EVP, Chief HR Officer
- Shares
- 11.35K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 30, 2026
LITCHFIELD, CAROLINE
EVP & CFO
- Shares
- 1.94K
- % company
- <0.01%
- Price
- $110.03
- Value
- $213,238
Filed Apr 29, 2026
OOSTHUIZEN, JOHANNES JACOBUS
EVP, Oncology & Int?l
- Shares
- 1.38K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 29, 2026
OOSTHUIZEN, JOHANNES JACOBUS
EVP, Oncology & Int?l
- Shares
- 679
- % company
- <0.01%
- Price
- $110.03
- Value
- $74,710
Filed Apr 29, 2026
OOSTHUIZEN, JOHANNES JACOBUS
EVP, Oncology & Int?l
- Shares
- 1.38K
- % company
- <0.01%
- Price
- $110.03
- Value
- $151,511
Filed Apr 29, 2026
DAVIS, ROBERT M
Director, Chairman, CEO & President
- Shares
- 13.30K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 29, 2026
LARSON, BETTY D
EVP, Chief HR Officer
- Shares
- 715
- % company
- <0.01%
- Price
- $110.03
- Value
- $78,671
Filed Apr 29, 2026
ZACHARY, JENNIFER
EVP, General Counsel
- Shares
- 2.95K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 29, 2026
DAVIS, ROBERT M
Director, Chairman, CEO & President
- Shares
- 6.55K
- % company
- <0.01%
- Price
- $110.03
- Value
- $720,807
Filed Apr 29, 2026
DAVIS, ROBERT M
Director, Chairman, CEO & President
- Shares
- 13.30K
- % company
- <0.01%
- Price
- $110.03
- Value
- $1,463,399
Filed Apr 29, 2026
LITCHFIELD, CAROLINE
EVP & CFO
- Shares
- 3.94K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 29, 2026
LITCHFIELD, CAROLINE
EVP & CFO
- Shares
- 3.94K
- % company
- <0.01%
- Price
- $110.03
- Value
- $432,968
Filed Apr 29, 2026
GUINDO, CHIRFI
EVP, Access, Policy & Comms
- Shares
- 1.97K
- % company
- <0.01%
- Price
- $110.03
- Value
- $216,429
Filed Apr 29, 2026
GUINDO, CHIRFI
EVP, Access, Policy & Comms
- Shares
- 969
- % company
- <0.01%
- Price
- $110.03
- Value
- $106,619
Filed Apr 29, 2026
GUINDO, CHIRFI
EVP, Access, Policy & Comms
- Shares
- 1.97K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 29, 2026
CHATTOPADHYAY, SANAT
Exe V-P & Pres. MMD
- Shares
- 2.60K
- % company
- <0.01%
- Price
- $110.03
- Value
- $285,748
Filed Apr 29, 2026
CHATTOPADHYAY, SANAT
Exe V-P & Pres. MMD
- Shares
- 1.13K
- % company
- <0.01%
- Price
- $110.03
- Value
- $124,334
Filed Apr 29, 2026
CHATTOPADHYAY, SANAT
Exe V-P & Pres. MMD
- Shares
- 2.60K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 29, 2026
DELUCA, RICHARD R.
EVP&Pres, Merck Animal Heallth
- Shares
- 2.52K
- % company
- <0.01%
- Price
- $110.03
- Value
- $277,056
Filed Apr 29, 2026
DELUCA, RICHARD R.
EVP&Pres, Merck Animal Heallth
- Shares
- 1.24K
- % company
- <0.01%
- Price
- $110.03
- Value
- $136,547
Filed Apr 29, 2026
DELUCA, RICHARD R.
EVP&Pres, Merck Animal Heallth
- Shares
- 2.52K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 29, 2026
WILLIAMS, DAVID MICHAEL
EVP,Chief Info&Digital Officer
- Shares
- 1.38K
- % company
- <0.01%
- Price
- $110.03
- Value
- $151,511
Filed Apr 29, 2026
WILLIAMS, DAVID MICHAEL
EVP,Chief Info&Digital Officer
- Shares
- 679
- % company
- <0.01%
- Price
- $110.03
- Value
- $74,710
Filed Apr 29, 2026
WILLIAMS, DAVID MICHAEL
EVP,Chief Info&Digital Officer
- Shares
- 1.38K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 29, 2026
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 944
- % company
- <0.01%
- Price
- $110.03
- Value
- $103,868
Filed Apr 29, 2026
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 324
- % company
- <0.01%
- Price
- $110.03
- Value
- $35,650
Filed Apr 29, 2026
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 944
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 29, 2026
LI, DEAN Y
Executive VP & President, MRL
- Shares
- 4.72K
- % company
- <0.01%
- Price
- $110.03
- Value
- $519,562
Filed Apr 29, 2026
LI, DEAN Y
Executive VP & President, MRL
- Shares
- 2.33K
- % company
- <0.01%
- Price
- $110.03
- Value
- $255,930
Filed Apr 29, 2026
LI, DEAN Y
Executive VP & President, MRL
- Shares
- 4.72K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 29, 2026
ZACHARY, JENNIFER
EVP, General Counsel
- Shares
- 2.95K
- % company
- <0.01%
- Price
- $110.03
- Value
- $324,699
Filed Apr 29, 2026
ZACHARY, JENNIFER
EVP, General Counsel
- Shares
- 1.45K
- % company
- <0.01%
- Price
- $110.03
- Value
- $159,984
Filed Apr 29, 2026
LARSON, BETTY D
EVP, Chief HR Officer
- Shares
- 2.08K
- % company
- <0.01%
- Price
- $110.03
- Value
- $229,413
Filed Apr 29, 2026
LARSON, BETTY D
EVP, Chief HR Officer
- Shares
- 2.08K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Apr 29, 2026
SEIDMAN, CHRISTINE E
Director
- Shares
- 68
- % company
- <0.01%
- Price
- $120.29
- Value
- $8,125
Filed Mar 31, 2026
COE, MARY ELLEN
Director
- Shares
- 249
- % company
- <0.01%
- Price
- $120.29
- Value
- $30,000
Filed Mar 31, 2026
GLOCER, THOMAS H
Director
- Shares
- 405
- % company
- <0.01%
- Price
- $120.29
- Value
- $48,750
Filed Mar 31, 2026
GUINDO, CHIRFI
Chief Marketing Officer
- Shares
- 10.00K
- % company
- <0.01%
- Price
- $121.46
- Value
- $1,214,562
Filed Feb 12, 2026
LI, DEAN Y
Executive VP & President, MRL
- Shares
- 10.23K
- % company
- <0.01%
- Price
- $117.52
- Value
- $1,202,844
Filed Feb 10, 2026
ZACHARY, JENNIFER
EVP, General Counsel
- Shares
- 25.95K
- % company
- <0.01%
- Price
- $119.15
- Value
- $3,091,523
Filed Feb 9, 2026
ZACHARY, JENNIFER
EVP, General Counsel
- Shares
- 25.95K
- % company
- <0.01%
- Price
- $119.15
- Value
- $3,091,523
Filed Feb 9, 2026
GUINDO, CHIRFI
Chief Marketing Officer
- Shares
- 10.00K
- % company
- <0.01%
- Price
- $118.41
- Value
- $1,184,101
Filed Feb 9, 2026
ZACHARY, JENNIFER
EVP, General Counsel
- Shares
- 56.79K
- % company
- <0.01%
- Price
- $119.15
- Value
- $6,766,892
Filed Feb 9, 2026
ZACHARY, JENNIFER
EVP, General Counsel
- Shares
- 56.79K
- % company
- <0.01%
- Price
- $119.15
- Value
- $6,766,892
Filed Feb 9, 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 |
| 13 | DELUCA, RICHARD R. EVP&Pres, Merck Animal Heallth | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 34.92K | Not reported | Not reported | May 5, 2026 |
| 14 | DAVIS, ROBERT M Director, Chairman, CEO & President | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 47.72K | Not reported | Not reported | May 5, 2026 |
| 15 | DAVIS, ROBERT M Director, Chairman, CEO & President | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 139.70K | Not reported | Not reported | May 5, 2026 |
| 16 | FOARD, BRIAN EVP, Specialty, Pharma, & ID | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 10.61K | Not reported | Not reported | May 5, 2026 |
| 17 | FOARD, BRIAN EVP, Specialty, Pharma, & ID | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 35.35K | Not reported | Not reported | May 5, 2026 |
| 18 | FOARD, BRIAN EVP, Specialty, Pharma, & ID | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 31.04K | Not reported | Not reported | May 5, 2026 |
| 19 | MARALDO, DAVID R. EVP & Pres. MMD | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 7.42K | Not reported | Not reported | May 5, 2026 |
| 20 | MARALDO, DAVID R. EVP & Pres. MMD | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 21.73K | Not reported | Not reported | May 5, 2026 |
| 21 | OOSTHUIZEN, JOHANNES JACOBUS EVP, Oncology & Int?l | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 31.04K | Not reported | Not reported | May 5, 2026 |
| 22 | ZACHARY, JENNIFER EVP, General Counsel | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 12.06K | Not reported | Not reported | May 5, 2026 |
| 23 | ZACHARY, JENNIFER EVP, General Counsel | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 35.31K | Not reported | Not reported | May 5, 2026 |
| 24 | WILLIAMS, DAVID MICHAEL EVP,Chief Info&Digital Officer | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 4.64K | Not reported | Not reported | May 5, 2026 |
| 25 | WILLIAMS, DAVID MICHAEL EVP,Chief Info&Digital Officer | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 13.58K | Not reported | Not reported | May 5, 2026 |
| 26 | LITCHFIELD, CAROLINE EVP & CFO | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 15.91K | Not reported | Not reported | May 5, 2026 |
| 27 | LITCHFIELD, CAROLINE EVP & CFO | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 46.57K | Not reported | Not reported | May 5, 2026 |
| 28 | LI, DEAN Y Executive VP & President, MRL | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 19.89K | Not reported | Not reported | May 5, 2026 |
| 29 | LI, DEAN Y Executive VP & President, MRL | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 58.21K | Not reported | Not reported | May 5, 2026 |
| 30 | LARSON, BETTY D EVP, Chief HR Officer | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 7.95K | Not reported | Not reported | May 5, 2026 |
| 31 | LARSON, BETTY D EVP, Chief HR Officer | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 23.28K | Not reported | Not reported | May 5, 2026 |
| 32 | DELUCA, RICHARD R. EVP&Pres, Merck Animal Heallth | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 11.93K | Not reported | Not reported | May 5, 2026 |
| 33 | GUINDO, CHIRFI EVP, Access, Policy & Comms | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 19.40K | Not reported | Not reported | May 5, 2026 |
| 34 | GUINDO, CHIRFI EVP, Access, Policy & Comms | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 6.63K | Not reported | Not reported | May 5, 2026 |
| 35 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 5.04K | Not reported | Not reported | May 5, 2026 |
| 36 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 2.30K | Not reported | Not reported | May 5, 2026 |
| 37 | OOSTHUIZEN, JOHANNES JACOBUS EVP, Oncology & Int?l | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 10.61K | Not reported | Not reported | May 5, 2026 |
| 38 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 383 | $112.16 | $42,957 | May 2, 2026 |
| 39 | MARALDO, DAVID R. EVP & Pres. MMD | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 552 | Not reported | Not reported | May 2, 2026 |
| 40 | MARALDO, DAVID R. EVP & Pres. MMD | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 159 | $112.16 | $17,833 | May 2, 2026 |
| 41 | MARALDO, DAVID R. EVP & Pres. MMD | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 552 | $112.16 | $61,912 | May 2, 2026 |
| 42 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 383 | Not reported | Not reported | May 2, 2026 |
| 43 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 132 | $112.16 | $14,805 | May 2, 2026 |
| 44 | LARSON, BETTY D EVP, Chief HR Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 5.14K | $110.95 | $570,616 | Apr 30, 2026 |
| 45 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 464 | $110.95 | $51,481 | Apr 30, 2026 |
| 46 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 159 | $110.95 | $17,641 | Apr 30, 2026 |
| 47 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 464 | Not reported | Not reported | Apr 30, 2026 |
| 48 | LARSON, BETTY D EVP, Chief HR Officer | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 11.35K | $110.95 | $1,259,283 | Apr 30, 2026 |
| 49 | LARSON, BETTY D EVP, Chief HR Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 11.35K | Not reported | Not reported | Apr 30, 2026 |
| 50 | LITCHFIELD, CAROLINE EVP & CFO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.94K | $110.03 | $213,238 | Apr 29, 2026 |
| 51 | OOSTHUIZEN, JOHANNES JACOBUS EVP, Oncology & Int?l | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.38K | Not reported | Not reported | Apr 29, 2026 |
| 52 | OOSTHUIZEN, JOHANNES JACOBUS EVP, Oncology & Int?l | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 679 | $110.03 | $74,710 | Apr 29, 2026 |
| 53 | OOSTHUIZEN, JOHANNES JACOBUS EVP, Oncology & Int?l | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.38K | $110.03 | $151,511 | Apr 29, 2026 |
| 54 | DAVIS, ROBERT M Director, Chairman, CEO & President | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 13.30K | Not reported | Not reported | Apr 29, 2026 |
| 55 | LARSON, BETTY D EVP, Chief HR Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 715 | $110.03 | $78,671 | Apr 29, 2026 |
| 56 | ZACHARY, JENNIFER EVP, General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.95K | Not reported | Not reported | Apr 29, 2026 |
| 57 | DAVIS, ROBERT M Director, Chairman, CEO & President | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 6.55K | $110.03 | $720,807 | Apr 29, 2026 |
| 58 | DAVIS, ROBERT M Director, Chairman, CEO & President | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 13.30K | $110.03 | $1,463,399 | Apr 29, 2026 |
| 59 | LITCHFIELD, CAROLINE EVP & CFO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 3.94K | Not reported | Not reported | Apr 29, 2026 |
| 60 | LITCHFIELD, CAROLINE EVP & CFO | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 3.94K | $110.03 | $432,968 | Apr 29, 2026 |
| 61 | GUINDO, CHIRFI EVP, Access, Policy & Comms | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.97K | $110.03 | $216,429 | Apr 29, 2026 |
| 62 | GUINDO, CHIRFI EVP, Access, Policy & Comms | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 969 | $110.03 | $106,619 | Apr 29, 2026 |
| 63 | GUINDO, CHIRFI EVP, Access, Policy & Comms | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.97K | Not reported | Not reported | Apr 29, 2026 |
| 64 | CHATTOPADHYAY, SANAT Exe V-P & Pres. MMD | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 2.60K | $110.03 | $285,748 | Apr 29, 2026 |
| 65 | CHATTOPADHYAY, SANAT Exe V-P & Pres. MMD | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.13K | $110.03 | $124,334 | Apr 29, 2026 |
| 66 | CHATTOPADHYAY, SANAT Exe V-P & Pres. MMD | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.60K | Not reported | Not reported | Apr 29, 2026 |
| 67 | DELUCA, RICHARD R. EVP&Pres, Merck Animal Heallth | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 2.52K | $110.03 | $277,056 | Apr 29, 2026 |
| 68 | DELUCA, RICHARD R. EVP&Pres, Merck Animal Heallth | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.24K | $110.03 | $136,547 | Apr 29, 2026 |
| 69 | DELUCA, RICHARD R. EVP&Pres, Merck Animal Heallth | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.52K | Not reported | Not reported | Apr 29, 2026 |
| 70 | WILLIAMS, DAVID MICHAEL EVP,Chief Info&Digital Officer | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.38K | $110.03 | $151,511 | Apr 29, 2026 |
| 71 | WILLIAMS, DAVID MICHAEL EVP,Chief Info&Digital Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 679 | $110.03 | $74,710 | Apr 29, 2026 |
| 72 | WILLIAMS, DAVID MICHAEL EVP,Chief Info&Digital Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.38K | Not reported | Not reported | Apr 29, 2026 |
| 73 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 944 | $110.03 | $103,868 | Apr 29, 2026 |
| 74 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 324 | $110.03 | $35,650 | Apr 29, 2026 |
| 75 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 944 | Not reported | Not reported | Apr 29, 2026 |
| 76 | LI, DEAN Y Executive VP & President, MRL | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 4.72K | $110.03 | $519,562 | Apr 29, 2026 |
| 77 | LI, DEAN Y Executive VP & President, MRL | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.33K | $110.03 | $255,930 | Apr 29, 2026 |
| 78 | LI, DEAN Y Executive VP & President, MRL | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 4.72K | Not reported | Not reported | Apr 29, 2026 |
| 79 | ZACHARY, JENNIFER EVP, General Counsel | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 2.95K | $110.03 | $324,699 | Apr 29, 2026 |
| 80 | ZACHARY, JENNIFER EVP, General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.45K | $110.03 | $159,984 | Apr 29, 2026 |
| 81 | LARSON, BETTY D EVP, Chief HR Officer | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 2.08K | $110.03 | $229,413 | Apr 29, 2026 |
| 82 | LARSON, BETTY D EVP, Chief HR Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.08K | Not reported | Not reported | Apr 29, 2026 |
| 83 | SEIDMAN, CHRISTINE E Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 68 | $120.29 | $8,125 | Mar 31, 2026 |
| 84 | COE, MARY ELLEN Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 249 | $120.29 | $30,000 | Mar 31, 2026 |
| 85 | GLOCER, THOMAS H Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 405 | $120.29 | $48,750 | Mar 31, 2026 |
| 86 | GUINDO, CHIRFI Chief Marketing Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 10.00K | $121.46 | $1,214,562 | Feb 12, 2026 |
| 87 | LI, DEAN Y Executive VP & President, MRL | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 10.23K | $117.52 | $1,202,844 | Feb 10, 2026 |
| 88 | ZACHARY, JENNIFER EVP, General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 25.95K | $119.15 | $3,091,523 | Feb 9, 2026 |
| 89 | ZACHARY, JENNIFER EVP, General Counsel | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 25.95K | $119.15 | $3,091,523 | Feb 9, 2026 |
| 90 | GUINDO, CHIRFI Chief Marketing Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 10.00K | $118.41 | $1,184,101 | Feb 9, 2026 |
| 91 | ZACHARY, JENNIFER EVP, General Counsel | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 56.79K | $119.15 | $6,766,892 | Feb 9, 2026 |
| 92 | ZACHARY, JENNIFER EVP, General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 56.79K | $119.15 | $6,766,892 | Feb 9, 2026 |
Showing 92 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.