Comparable stake leader
VANGUARD CAPITAL MANAGEMENT LLC
SEC ownership of Merck & Co., Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000310158.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- MRK on NYSE
- Parsed ownership sources
-
13D/G and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
VANGUARD CAPITAL MANAGEMENT LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
VANGUARD CAPITAL MANAGEMENT LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000310158
- Issuer location
- Rahway, NJ
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Merck & Co., Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
VANGUARD CAPITAL MANAGEME...
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
13D/G
13F
Lead comparable stake: 7.5%
13D/G row: VANGUARD CAPITAL MANAGEMENT LLC
Showing 1-8 of 50 holder rows.
Quick read
VANGUARD CAPITAL MANAGEMENT LLC leads the comparable SEC ownership view at 7.5%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens VANGUARD CAPITAL MANAGEMENT LLC's linked filing trail.
Comparable ownership
Top 5
VANGUARD CAPITAL MANAGEMENT LLC
7.5%
BlackRock, Inc.
9.1%
STATE STREET CORP
4.8%
WELLINGTON MANAGEMENT GROUP LLP
3.4%
VANGUARD PORTFOLIO MANAGEMENT LLC
2.7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
7.5%
|
$22,412,885,812
186,323,766 shares
|
$0 | 31 Mar 2026 |
| BlackRock, Inc. |
13F
Company
|
9.1%
|
$27,165,130,301
225,830,330 shares
|
— | 31 Mar 2026 |
| STATE STREET CORP |
13F
Company
|
4.8%
|
$14,453,274,004
119,325,673 shares
|
— | 31 Mar 2026 |
| WELLINGTON MANAGEMENT GROUP LLP |
13F
Company
|
3.4%
|
$10,142,247,862
84,314,971 shares
|
— | 31 Mar 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
Company
|
2.7%
|
$8,096,034,848
67,304,305 shares
|
— | 31 Mar 2026 |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
Company
|
2.4%
|
$7,140,235,212
59,558,154 shares
|
— | 31 Mar 2026 |
| JPMORGAN CHASE & CO |
13F
Company
|
2.1%
|
$6,256,109,598
52,972,983 shares
|
— | 31 Mar 2026 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
Company
|
2%
|
$5,986,904,095
49,765,225 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$42,036,232.
Buys
$0
Insiders: 0
Sells
$42,036,232
Insiders: 10
Net
-$42,036,232
Shares: -356,110
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 356,110
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 340,411 | $0 | $40,699,797 | -$40,699,797 |
| 6-9 | 0 | 7,085 | $0 | $616,395 | -$616,395 |
| 9-12 | 0 | 8,614 | $0 | $720,040 | -$720,040 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 37 reporting-owner rows connected to Merck & Co., Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
37
Largest Forms 3/4/5 holder
Kenneth C. Frazier
Net 12M change
-$42,036,233
Latest report
30 Jun 2026
| 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% | Mixed | 05 May 2026 |
| Sanat Chattopadhyay | Exe V-P & Pres. MMD | $24,139,193 | Mixed | 29 Apr 2026 | ||
| Richard R. DeLuca Jr. | EVP&Pres, Merck Animal Heallth | $19,590,195 | -$4,557,025 | -19% | Mixed | 05 May 2026 |
| Peter C. Wendell | Director | $16,586,608 | Mixed | 28 Mar 2024 | ||
| Thomas H. Glocer | Director | $11,884,264 | Mixed | 29 May 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% | Mixed | 05 May 2026 |
| Caroline Litchfield | Evp & Cfo | $11,102,846 | -$5,023,312 | -31% | Mixed | 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% | Mixed | 05 May 2026 |
| Patricia F. Russo | Director | $6,078,512 | Mixed | 29 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 | ||
| David Michael Williams | EVP,Chief Info&Digital Officer | $3,815,122 | -$1,329,565 | -26% | Mixed | 05 May 2026 |
| David R. Maraldo | EVP & Pres. MMD | $3,196,293 | Mixed | 05 May 2026 | ||
| Joseph Romanelli | President, Human Health Int?l | $3,086,605 | Mixed | 26 Jan 2026 | ||
| Mary Ellen Coe | Director | $3,078,117 | Mixed | 30 Jun 2026 |
Recent insider transactions for Merck & Co., Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Christine E. Seidman | MRK | Phantom Stock | Award | 0.3% | 63.23 | 21,291 | 30 Jun 2026 | Direct | ||
| Surendralal L. Karsanbhai | MRK | Phantom Stock | Award | 2.35% | 126 | 5,519 | 30 Jun 2026 | Direct | ||
| Mary Ellen Coe | MRK | Phantom Stock | Award | 0.73% | 233 | 31,999 | 30 Jun 2026 | Direct | ||
| Kathy J. Warden | MRK | Phantom Stock | Award | 11.6% | 1,853 | 17,890 | 29 May 2026 | Direct | ||
| Surendralal L. Karsanbhai | MRK | Phantom Stock | Award | 52.4% | 1,853 | 5,392 | 29 May 2026 | Direct | ||
| Mary Ellen Coe | MRK | Phantom Stock | Award | 6.2% | 1,853 | 31,766 | 29 May 2026 | Direct | ||
| Inge G. Thulin | MRK | Phantom Stock | Award | 7.23% | 1,853 | 27,470 | 29 May 2026 | Direct | ||
| Christine E. Seidman | MRK | Phantom Stock | Award | 9.56% | 1,853 | 21,228 | 29 May 2026 | Direct | ||
| Patricia F. Russo | MRK | Phantom Stock | Award | 3.06% | 1,853 | 62,391 | 29 May 2026 | Direct | ||
| Paul B. Rothman | MRK | Phantom Stock | Award | 5.6% | 1,853 | 34,945 | 29 May 2026 | Direct | ||
| Stephen L. Mayo | MRK | Phantom Stock | Award | 14.3% | 1,853 | 14,825 | 29 May 2026 | Direct | ||
| Risa J. Lavizzo-Mourey | MRK | Phantom Stock | Award | 11.7% | 1,853 | 17,749 | 29 May 2026 | Direct | ||
| Thomas H. Glocer | MRK | Phantom Stock | Award | 1.7% | 1,853 | 110,912 | 29 May 2026 | Direct | ||
| Pamela J. Craig | MRK | Phantom Stock | Award | 5.6% | 1,853 | 34,945 | 29 May 2026 | Direct | ||
| Douglas M. Baker Jr. | MRK | Phantom Stock | Award | 19.2% | 1,853 | 11,518 | 29 May 2026 | Direct | ||
| 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 |
* marks a reported price that did not pass the local price check.