Quick Takeaways
- MRK - Merck & Co., Inc. has 37 insiders with reported activity on this page.
- Net insider value flow over the last year: -$42,036,232.
- Recent transaction rows are available for direct filing-level review.
Insider Transactions Reported by 37 Insiders of Merck & Co., Inc.
- Symbol
- MRK on NYSE
- Location
- Rahway, NJ
What Changed
- Buy value: ; sell value: $42,036,232.
- Net share flow: -356,110.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Source Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsNet insider flow leans to selling over the last 12 months. Net value: -$42,036,232.
Buys
$0
Shares: 0
Insiders: 0
Sells
$42,036,232
Shares: 356,110
Insiders: 10
Net
-$42,036,232
Shares: -356,110
Insiders: -10
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 340,411 | $0 | $40,699,797 | -$40,699,797 |
| 6-9 | 0 | 15,699 | $0 | $1,336,435 | -$1,336,435 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Merck & Co., Inc. executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Kenneth C. Frazier | Executive Chair, Director | $83,678,995 | Mixed | 07 Nov 2022 | ||
| Robert M. Davis | Chairman, CEO & President, Director | $54,172,692 | -$5,599,327 | -9.4% | Median | 05 May 2026 |
| Sanat Chattopadhyay | Exe V-P & Pres. MMD | $24,139,193 | Median | 29 Apr 2026 | ||
| Richard R. DeLuca Jr. | EVP&Pres, Merck Animal Heallth | $19,590,195 | -$4,557,025 | -19% | Median | 05 May 2026 |
| Peter C. Wendell | Director | $16,586,608 | Mixed | 28 Mar 2024 | ||
| Thomas H. Glocer | Director | $11,807,611 | Mixed | 31 Mar 2026 | ||
| Frank Clyburn | EVP & Pres ? Human Health | $11,596,066 | Mixed | 30 Oct 2021 | ||
| Dean Y. Li | Executive VP & President, MRL | $11,359,111 | -$2,994,668 | -21% | Median | 05 May 2026 |
| Caroline Litchfield | Evp & Cfo | $11,102,846 | -$5,023,312 | -31% | Median | 05 May 2026 |
| Chirfi Guindo | EVP, Access, Policy & Comms | $10,675,006 | -$4,836,339 | -31% | Mixed | 05 May 2026 |
| Jennifer Zachary | EVP, General Counsel | $8,528,230 | -$14,485,690 | -63% | Median | 05 May 2026 |
| Betty D. Larson | EVP, Chief HR Officer | $6,042,514 | Mixed | 05 May 2026 | ||
| Julie L. Gerberding | EVP, Chief Patient Officer | $5,817,691 | Mixed | 24 Feb 2022 | ||
| Leslie A. Brun | Director | $5,653,021 | Mixed | 28 May 2021 | ||
| Rita A. Karachun | Sr. VP Fince-Global Controller | $5,581,631 | Mixed | 03 May 2023 | ||
| Patricia F. Russo | Director | $5,504,471 | Mixed | 30 May 2025 | ||
| David Michael Williams | EVP,Chief Info&Digital Officer | $3,815,122 | -$1,329,565 | -26% | Median | 05 May 2026 |
| David R. Maraldo | EVP & Pres. MMD | $3,196,293 | Median | 05 May 2026 | ||
| Joseph Romanelli | President, Human Health Int?l | $3,086,605 | Mixed | 26 Jan 2026 | ||
| Mary Ellen Coe | Director | $3,077,967 | Mixed | 31 Mar 2026 | ||
| Michael A. Klobuchar | EVP - Chief Strategy Officer | $3,012,741 | Mixed | 04 May 2024 | ||
| Steven Mizell | EVP, Chief HR Officer | $2,991,343 | Filing P/S | 02 Feb 2024 | ||
| Johannes Jacobus Oosthuizen | EVP, Oncology & Int?l | $2,633,796 | -$1,827,992 | -41% | Median | 05 May 2026 |
| Pamela J. Craig | Director | $2,589,592 | Mixed | 30 May 2025 | ||
| Paul Rothman | Director | $2,465,836 | Mixed | 30 May 2025 | ||
| Inge G. Thulin | Director | $2,127,633 | Mixed | 30 May 2025 | ||
| Christine E. Seidman | Director | $2,013,167 | Mixed | 31 Mar 2026 | ||
| Douglas M. Baker Jr. | Director | $1,944,036 | Mixed | 30 May 2025 | ||
| Risa J. Lavizzo-Mourey | Director | $1,257,457 | Mixed | 30 May 2025 | ||
| Kathy J. Warden | Director | $1,229,611 | Mixed | 30 May 2025 | ||
| Dalton E. Smart III | SVP Fin. - Global Controller | $1,129,320 | -$765,920 | -40% | Median | 05 May 2026 |
| Stephen Mayo | Director | $971,223 | Mixed | 30 May 2025 | ||
| Lisa LeCointe-Cephas | SVP Chief Ethics & Com Officer | $719,173 | Mixed | 03 May 2023 | ||
| Arpa Garay | SVP Human Health Global Mktg. | $486,165 | Mixed | 03 May 2022 | ||
| Surendralal Lanca Karsanbhai | Director | $262,982 | Mixed | 30 May 2025 | ||
| Cristal N. Downing | Chief Comm. & Public Afrs Ofcr | $0 | -$616,395 | -100% | Mixed | 10 Nov 2025 |
| Brian Foard | EVP, Specialty, Pharma, & ID | Mixed | 05 May 2026 |
Top shareholders of Merck & Co., Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| VANGUARD GROUP INC |
13F
|
Company |
10%
|
254,322,763
|
$26,770,014,033 | — | 31 Dec 2025 | |
| BlackRock, Inc. |
13F
|
Company |
8.9%
|
219,095,465
|
$23,061,988,586 | — | 31 Dec 2025 | |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
|
Vanguard Capital Management |
7.5%
|
186,323,766
|
$22,412,885,812 | $0 | 31 Mar 2026 | |
| STATE STREET CORP |
13F
|
Company |
4.9%
|
120,040,168
|
$12,737,503,943 | — | 31 Dec 2025 | |
| WELLINGTON MANAGEMENT GROUP LLP |
13F
|
Company |
3.5%
|
86,435,458
|
$9,098,196,310 | — | 31 Dec 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
2.4%
|
60,047,984
|
$6,307,571,859 | — | 31 Dec 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
2%
|
48,563,804
|
$5,111,826,930 | — | 31 Dec 2025 | |
| MORGAN STANLEY |
13F
|
Company |
1.8%
|
44,946,021
|
$4,731,018,465 | — | 31 Dec 2025 | |
| FMR LLC |
13F
|
Company |
1.7%
|
40,836,566
|
$4,298,456,848 | — | 31 Dec 2025 | |
| NORGES BANK |
13F
|
Company |
1.5%
|
37,981,502
|
$3,997,932,901 | — | 31 Dec 2025 | |
| JPMORGAN CHASE & CO |
13F
|
Company |
1.2%
|
29,199,978
|
$3,073,589,831 | — | 31 Dec 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
1.1%
|
27,854,441
|
$2,931,958,400 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
1.1%
|
27,234,642
|
$2,866,718,416 | — | 31 Dec 2025 | |
| Fisher Asset Management, LLC |
13F
|
Company |
1%
|
24,873,327
|
$2,618,166,478 | — | 31 Dec 2025 | |
| Invesco Ltd. |
13F
|
Company |
0.83%
|
20,546,185
|
$2,162,691,447 | — | 31 Dec 2025 | |
| Legal & General Group Plc |
13F
|
Company |
0.8%
|
19,776,842
|
$2,081,710,387 | — | 31 Dec 2025 | |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC |
13F
|
Company |
0.79%
|
19,433,403
|
$2,045,560,000 | — | 31 Dec 2025 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
0.78%
|
19,348,718
|
$2,036,645,998 | — | 31 Dec 2025 | |
| UBS Group AG |
13F
|
Company |
0.78%
|
19,178,272
|
$2,018,704,911 | — | 31 Dec 2025 | |
| Bank of New York Mellon Corp |
13F
|
Company |
0.77%
|
19,164,526
|
$2,017,257,973 | — | 31 Dec 2025 | |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13F
|
Company |
0.76%
|
18,753,390
|
$1,973,983,000 | — | 31 Dec 2025 | |
| FRANKLIN RESOURCES INC |
13F
|
Company |
0.65%
|
16,064,050
|
$1,690,901,822 | — | 31 Dec 2025 | |
| AMERIPRISE FINANCIAL INC |
13F
|
Company |
0.65%
|
15,974,409
|
$1,683,102,538 | — | 31 Dec 2025 | |
| HARRIS ASSOCIATES L P |
13F
|
Company |
0.57%
|
14,088,705
|
$1,482,977,135 | — | 31 Dec 2025 | |
| STATE FARM MUTUAL AUTOMOBILE INSURANCE CO |
13F
|
Company |
0.56%
|
13,794,969
|
$1,452,058,437 | — | 31 Dec 2025 | |
| Amundi |
13F
|
Individual |
0.54%
|
13,385,093
|
$1,408,915,521 | — | 31 Dec 2025 | |
| ROYAL BANK OF CANADA |
13F
|
Company |
0.53%
|
13,190,085
|
$1,388,388,000 | — | 31 Dec 2025 | |
| DEUTSCHE BANK AG\ |
13F
|
Company |
0.52%
|
12,788,311
|
$1,346,097,614 | — | 31 Dec 2025 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
0.5%
|
12,486,183
|
$1,314,396,407 | — | 31 Dec 2025 | |
| AQR CAPITAL MANAGEMENT LLC |
13F
|
Company |
0.45%
|
11,249,363
|
$1,184,107,948 | — | 31 Dec 2025 | |
| WELLS FARGO & COMPANY/MN |
13F
|
Company |
0.45%
|
11,048,211
|
$1,162,934,706 | — | 31 Dec 2025 | |
| NORDEA INVESTMENT MANAGEMENT AB |
13F
|
Company |
0.43%
|
10,573,821
|
$1,115,009,425 | — | 31 Dec 2025 | |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP |
13F
|
Company |
0.4%
|
9,944,123
|
$1,046,718,387 | — | 31 Dec 2025 | |
| ALLIANCEBERNSTEIN L.P. |
13F
|
Company |
0.35%
|
8,632,385
|
$908,644,845 | — | 31 Dec 2025 | |
| CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM |
13F
|
Company |
0.35%
|
8,568,406
|
$901,910,416 | — | 31 Dec 2025 | |
| STIFEL FINANCIAL CORP |
13F
|
Company |
0.35%
|
8,547,069
|
$899,668,940 | — | 31 Dec 2025 | |
| HSBC HOLDINGS PLC |
13F
|
Company |
0.33%
|
8,075,449
|
$850,548,417 | — | 31 Dec 2025 | |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC |
13F
|
Company |
0.31%
|
7,793,176
|
$820,309,705 | — | 31 Dec 2025 | |
| Swedbank AB |
13F
|
Company |
0.31%
|
7,651,671
|
$805,414,889 | — | 31 Dec 2025 | |
| PNC FINANCIAL SERVICES GROUP, INC. |
13F
|
Company |
0.31%
|
7,621,832
|
$802,274,068 | — | 31 Dec 2025 | |
| Deutsche Girozentrale DekaBank |
13F
|
Individual |
0.22%
|
5,427,912
|
$774,021,000 | — | 31 Dec 2025 | |
| Aristotle Capital Management, LLC |
13F
|
Company |
0.29%
|
7,280,893
|
$766,394,030 | — | 31 Dec 2025 | |
| Sumitomo Mitsui Trust Group, Inc. |
13F
|
Company |
0.28%
|
6,971,801
|
$733,851,773 | — | 31 Dec 2025 | |
| Nuveen, LLC |
13F
|
Company |
0.28%
|
6,958,069
|
$732,406,343 | — | 31 Dec 2025 | |
| RAYMOND JAMES FINANCIAL INC |
13F
|
Company |
0.28%
|
6,928,656
|
$729,443,569 | — | 31 Dec 2025 | |
| Grantham, Mayo, Van Otterloo & Co. LLC |
13F
|
Company |
0.28%
|
6,870,145
|
$723,151,560 | — | 31 Dec 2025 | |
| Swiss National Bank |
13F
|
Company |
0.28%
|
6,843,451
|
$720,341,652 | — | 31 Dec 2025 | |
| CITADEL ADVISORS LLC |
13F
|
Company |
0.28%
|
6,821,331
|
$718,013,301 | — | 31 Dec 2025 | |
| MILLENNIUM MANAGEMENT LLC |
13F
|
Company |
0.27%
|
6,800,351
|
$715,804,946 | — | 31 Dec 2025 | |
| National Pension Service |
13F
|
Company |
0.23%
|
5,789,424
|
$609,394,770 | — | 31 Dec 2025 |
Recent Insider Transactions by Companies or Individuals for Merck & Co., Inc.
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Jennifer Zachary | MRK | Stock Option (Right to Buy) | Award | 35,312 | 35,312 | 05 May 2026 | Direct | |||
| Jennifer Zachary | MRK | Restricted Stock Unit | Award | 12,064 | 12,064 | 05 May 2026 | Direct | |||
| David Michael Williams | MRK | Stock Option (Right to Buy) | Award | 13,582 | 13,582 | 05 May 2026 | Direct | |||
| David Michael Williams | MRK | Restricted Stock Unit | Award | 4,640 | 4,640 | 05 May 2026 | Direct | |||
| Caroline Litchfield | MRK | Stock Option (Right to Buy) | Award | 46,566 | 46,566 | 05 May 2026 | Direct | |||
| Caroline Litchfield | MRK | Restricted Stock Unit | Award | 15,908 | 15,908 | 05 May 2026 | Direct | |||
| Dean Y. Li | MRK | Stock Option (Right to Buy) | Award | 58,207 | 58,207 | 05 May 2026 | Direct | |||
| Dean Y. Li | MRK | Restricted Stock Unit | Award | 19,885 | 19,885 | 05 May 2026 | Direct | |||
| Betty D. Larson | MRK | Stock Option (Right to Buy) | Award | 23,283 | 23,283 | 05 May 2026 | Direct | |||
| Betty D. Larson | MRK | Restricted Stock Unit | Award | 7,954 | 7,954 | 05 May 2026 | Direct | |||
| Richard R. DeLuca Jr. | MRK | Stock Option (Right to Buy) | Award | 34,924 | 34,924 | 05 May 2026 | Direct | |||
| Richard R. DeLuca Jr. | MRK | Restricted Stock Unit | Award | 11,931 | 11,931 | 05 May 2026 | Direct | |||
| Robert M. Davis | MRK | Stock Option (Right to Buy) | Award | 139,697 | 139,697 | 05 May 2026 | Direct | |||
| Robert M. Davis | MRK | Restricted Stock Unit | Award | 47,724 | 47,724 | 05 May 2026 | Direct | |||
| Brian Foard | MRK | Stock Option (Right to Buy) | Award | 31,044 | 31,044 | 05 May 2026 | Direct | |||
| Brian Foard | MRK | Restricted Stock Unit | Award | 45,956 | 35,351 | 05 May 2026 | Direct | |||
| David R. Maraldo | MRK | Stock Option (Right to Buy) | Award | 21,731 | 21,731 | 05 May 2026 | Direct | |||
| David R. Maraldo | MRK | Restricted Stock Unit | Award | 7,424 | 7,424 | 05 May 2026 | Direct | |||
| Johannes Jacobus Oosthuizen | MRK | Stock Option (Right to Buy) | Award | 31,044 | 31,044 | 05 May 2026 | Direct | |||
| Johannes Jacobus Oosthuizen | MRK | Restricted Stock Unit | Award | 10,605 | 10,605 | 05 May 2026 | Direct | |||
| Dalton E. Smart III | MRK | Stock Option (Right to Buy) | Award | 5,045 | 5,045 | 05 May 2026 | Direct | |||
| Dalton E. Smart III | MRK | Restricted Stock Unit | Award | 2,298 | 2,298 | 05 May 2026 | Direct | |||
| Chirfi Guindo | MRK | Stock Option (Right to Buy) | Award | 19,402 | 19,402 | 05 May 2026 | Direct | |||
| Chirfi Guindo | MRK | Restricted Stock Unit | Award | 6,628 | 6,628 | 05 May 2026 | Direct | |||
| Dalton E. Smart III | MRK | Common Stock | Tax liability | -1.39% | -132 | 9,388 | 02 May 2026 | Direct | ||
| Dalton E. Smart III | MRK | Common Stock | Options Exercise | 4.19% | 383 | 9,520 | 02 May 2026 | Direct | ||
| Dalton E. Smart III | MRK | Restricted Stock Unit | Options Exercise | -100% | -383 | 0 | 02 May 2026 | Direct | ||
| David R. Maraldo | MRK | Common Stock | Tax liability | -0.87% | -159 | 18,212 | 02 May 2026 | Direct | ||
| David R. Maraldo | MRK | Common Stock | Options Exercise | 3.1% | 552 | 18,371 | 02 May 2026 | Direct | ||
| David R. Maraldo | MRK | Restricted Stock Unit | Options Exercise | -100% | -552 | 0 | 02 May 2026 | Direct | ||
| Dalton E. Smart III | MRK | Common Stock | Tax liability | -1.71% | -159 | 9,137 | 30 Apr 2026 | Direct | ||
| Dalton E. Smart III | MRK | Common Stock | Options Exercise | 5.25% | 464 | 9,296 | 30 Apr 2026 | Direct | ||
| Dalton E. Smart III | MRK | Restricted Stock Unit | Options Exercise | -50% | -464 | 465 | 30 Apr 2026 | Direct | ||
| Betty D. Larson | MRK | Common Stock | Tax liability | -27.2% | -5,143 | 13,774 | 30 Apr 2026 | Direct | ||
| Betty D. Larson | MRK | Common Stock | Options Exercise | 150% | 11,350 | 18,917 | 30 Apr 2026 | Direct | ||
| Betty D. Larson | MRK | Restricted Stock Unit | Options Exercise | -50% | -11,350 | 11,350 | 30 Apr 2026 | Direct | ||
| Mr. Chirfi Guindo | MRK | Common Stock | Tax liability | -1.55% | -969 | 61,613 | 29 Apr 2026 | Direct | ||
| Mr. Chirfi Guindo | MRK | Common Stock | Options Exercise | 3.25% | 1,967 | 62,582 | 29 Apr 2026 | Direct | ||
| Mr. Chirfi Guindo | MRK | Restricted Stock Unit | Options Exercise | -33.3% | -1,967 | 3,935 | 29 Apr 2026 | Direct | ||
| Sanat Chattopadhyay | MRK | Common Stock | Tax liability | -6.86% | -1,130 | 15,347 | 29 Apr 2026 | Direct | ||
| Sanat Chattopadhyay | MRK | Common Stock | Options Exercise | 18.7% | 2,597 | 16,477 | 29 Apr 2026 | Direct | ||
| Sanat Chattopadhyay | MRK | Restricted Stock Unit | Options Exercise | -33.3% | -2,597 | 5,194 | 29 Apr 2026 | Direct | ||
| Richard R. DeLuca Jr. | MRK | Common Stock | Tax liability | -0.76% | -1,241 | 161,537 | 29 Apr 2026 | Direct | ||
| Richard R. DeLuca Jr. | MRK | Common Stock | Options Exercise | 1.57% | 2,518 | 162,778 | 29 Apr 2026 | Direct | ||
| Richard R. DeLuca Jr. | MRK | Restricted Stock Unit | Options Exercise | -33.3% | -2,518 | 5,037 | 29 Apr 2026 | Direct | ||
| David Michael Williams | MRK | Common Stock | Tax liability | -2.1% | -679 | 31,716 | 29 Apr 2026 | Direct | ||
| David Michael Williams | MRK | Common Stock | Options Exercise | 4.44% | 1,377 | 32,395 | 29 Apr 2026 | Direct | ||
| David Michael Williams | MRK | Restricted Stock Unit | Options Exercise | -33.3% | -1,377 | 2,755 | 29 Apr 2026 | Direct | ||
| Dalton E. Smart III | MRK | Common Stock | Tax liability | -3.54% | -324 | 8,832 | 29 Apr 2026 | Direct | ||
| Dalton E. Smart III | MRK | Common Stock | Options Exercise | 11.5% | 944 | 9,156 | 29 Apr 2026 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.