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.
Ownership read
MRK insider sentiment: Net selling.
VANGUARD GROUP INC is the largest loaded institutional holder. 55 sale rows and 0 purchase rows are visible in the loaded Form 4 history. Use the filters below to separate real buying and selling from option exercises, gifts, awards, and tax withholding.
Insider flow
MRK
Purchases—
Sales617.89K
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
254.32M
VANGUARD GROUP INC
Insider stance
Net selling
$44.64M sold / — bought
Latest filing
May 5, 2026
Most recent holder or insider filing date
Rows loaded
240
120 holder / 120 insider
- Holder rows
- 120
- Market data feed
- Latest filing
- May 5, 2026
- Most recent holder or insider filing date
- Increased / initiated
- 57
- 60 decreased in loaded rows
- Insider rows
- 120
- Market data feed
Top 120 institutional holders
Merck & Company Inc (MRK) institutional ownership
Ranked by reported share count, with position changes and latest filing dates where the ownership feed supplies them.
BLACKROCK
Rank #2
9.12%
- 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 %
- -1.21%
- 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 | 9.12% | 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 | -1.21% | 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.
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 2.30K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 5, 2026
GUINDO, CHIRFI
EVP, Access, Policy & Comms
- Shares
- 19.40K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 5, 2026
GUINDO, CHIRFI
EVP, Access, Policy & Comms
- Shares
- 6.63K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 5, 2026
SMART, DALTON E. III
SVP Fin. - Global Controller
- Shares
- 5.04K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 5, 2026
WILLIAMS, DAVID MICHAEL
EVP,Chief Info&Digital Officer
- Shares
- 13.58K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 5, 2026
WILLIAMS, DAVID MICHAEL
EVP,Chief Info&Digital Officer
- Shares
- 4.64K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 5, 2026
ZACHARY, JENNIFER
EVP, General Counsel
- Shares
- 35.31K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 5, 2026
ZACHARY, JENNIFER
EVP, General Counsel
- Shares
- 12.06K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 5, 2026
LI, DEAN Y
Executive VP & President, MRL
- Shares
- 58.21K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 5, 2026
LI, DEAN Y
Executive VP & President, MRL
- Shares
- 19.89K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 5, 2026
LITCHFIELD, CAROLINE
EVP & CFO
- Shares
- 46.57K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 5, 2026
LARSON, BETTY D
EVP, Chief HR Officer
- Shares
- 7.95K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 5, 2026
| # | Insider | % company | Action | Shares | Price | Value | Filing date |
|---|---|---|---|---|---|---|---|
| 1 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | Award / grant | 2.30K | No cash value | No cash value | May 5, 2026 |
| 2 | GUINDO, CHIRFI EVP, Access, Policy & Comms | <0.01% | Award / grant | 19.40K | No cash value | No cash value | May 5, 2026 |
| 3 | GUINDO, CHIRFI EVP, Access, Policy & Comms | <0.01% | Award / grant | 6.63K | No cash value | No cash value | May 5, 2026 |
| 4 | SMART, DALTON E. III SVP Fin. - Global Controller | <0.01% | Award / grant | 5.04K | No cash value | No cash value | May 5, 2026 |
| 5 | WILLIAMS, DAVID MICHAEL EVP,Chief Info&Digital Officer | <0.01% | Award / grant | 13.58K | No cash value | No cash value | May 5, 2026 |
| 6 | WILLIAMS, DAVID MICHAEL EVP,Chief Info&Digital Officer | <0.01% | Award / grant | 4.64K | No cash value | No cash value | May 5, 2026 |
| 7 | ZACHARY, JENNIFER EVP, General Counsel | <0.01% | Award / grant | 35.31K | No cash value | No cash value | May 5, 2026 |
| 8 | ZACHARY, JENNIFER EVP, General Counsel | <0.01% | Award / grant | 12.06K | No cash value | No cash value | May 5, 2026 |
| 9 | LI, DEAN Y Executive VP & President, MRL | <0.01% | Award / grant | 58.21K | No cash value | No cash value | May 5, 2026 |
| 10 | LI, DEAN Y Executive VP & President, MRL | <0.01% | Award / grant | 19.89K | No cash value | No cash value | May 5, 2026 |
| 11 | LITCHFIELD, CAROLINE EVP & CFO | <0.01% | Award / grant | 46.57K | No cash value | No cash value | May 5, 2026 |
| 12 | LARSON, BETTY D EVP, Chief HR Officer | <0.01% | Award / grant | 7.95K | No cash value | No cash value | May 5, 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 in the loaded MRK ownership feed, with 254.32 million shares, or about 10.27% of shares outstanding. The table ranks additional institutions by reported share count.
What is institutional ownership of MRK?
The current TECHi snapshot has 120 loaded institutional rows for Merck & Company Inc. 57 rows are marked increased or initiated, while 60 rows are marked decreased, with the latest holder filing dated Mar 31, 2026.
Where can I see Merck & Company Inc insider transactions?
The insider transaction table currently shows 120 loaded Form 4 rows for MRK, with the latest insider filing dated May 5, 2026. It separates purchases, sales, option exercises, awards, gifts, and tax withholding so administrative transactions are not confused with open-market trades.
Are MRK insiders buying or selling?
The loaded MRK Form 4 rows currently read Net selling: 55 sale rows and 0 purchase rows. Awards, gifts, conversions, and tax withholding are shown separately because they do not carry the same signal as open-market buying or selling.
Who is the most active MRK insider in the loaded filings?
ZACHARY, JENNIFER is the most active insider by absolute share movement in the loaded MRK rows, with 431,034 shares moving across the visible filing history. Review the action labels before treating that activity as buying or selling.