Form 4
Tax / Compensation Filing
2026-04-01
MRK insider Form 4 filed for equity award, exercise, or tax withholding
Seidman Christine E (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.
Filing: Form 4 (Insider Transaction)
Insider: Seidman Christine E (Director)
Form 4
Tax / Compensation Filing
2026-04-01
MRK insider Form 4 filed for equity award, exercise, or tax withholding
GLOCER THOMAS H (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.
Filing: Form 4 (Insider Transaction)
Insider: GLOCER THOMAS H (Director)
Form 4
Tax / Compensation Filing
2026-04-01
MRK insider Form 4 filed for equity award, exercise, or tax withholding
Coe Mary Ellen (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.
Filing: Form 4 (Insider Transaction)
Insider: Coe Mary Ellen (Director)
Form 10-K
Annual Report
2026-02-24
MRK filed Annual Report (10-K)
Merck & Co., Inc. filed its annual report with the SEC. This report includes audited financial statements, business overview, risk factors, and management discussion.
Filing: 10-K (Annual Report)
Form 4
Insider Selling
2026-02-12
MRK insider Guindo Chirfi (Chief Marketing Officer) sold 10,000 shares (~$1.21M)
Guindo Chirfi, listed as Chief Marketing Officer at Merck & Co., Inc., reported an open-market sale of 10,000 MRK shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
Filing: Form 4 (Insider Transaction)
Insider: Guindo Chirfi (Chief Marketing Officer)
Shares: 10,000
Est. Value: $1.21M
Form 144
Proposed Insider Sale
2026-02-10
MRK Form 144 filed for proposed insider sale by DEAN LI (10,235 shares) ~$2.41M
DEAN LI filed a Form 144 with the SEC indicating intent to sell MRK (Merck & Co., Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.
Filing: Form 144 (Proposed Sale Notice)
Insider: DEAN LI
Shares: 10,235
Est. Value: $2.41M
Form 4
Insider Selling
2026-02-10
MRK insider Li Dean Y (Executive VP & President, MRL) sold 10,235 shares (~$1.20M)
Li Dean Y, listed as Executive VP & President, MRL at Merck & Co., Inc., reported an open-market sale of 10,235 MRK shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
Filing: Form 4 (Insider Transaction)
Insider: Li Dean Y (Executive VP & President, MRL)
Shares: 10,235
Est. Value: $1.20M
Form 144
Large Proposed Insider Sale
2026-02-09
MRK Form 144 filed for proposed insider sale by JENNIFER ZACHARY (121,573 shares) ~$28.97M
JENNIFER ZACHARY filed a Form 144 with the SEC indicating intent to sell MRK (Merck & Co., Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.
Filing: Form 144 (Proposed Sale Notice)
Insider: JENNIFER ZACHARY
Shares: 121,573
Est. Value: $28.97M
Form 144
Proposed Insider Sale
2026-02-09
MRK Form 144 filed for proposed insider sale by CHIRFI GUINDO (20,000 shares) ~$4.74M
CHIRFI GUINDO filed a Form 144 with the SEC indicating intent to sell MRK (Merck & Co., Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.
Filing: Form 144 (Proposed Sale Notice)
Insider: CHIRFI GUINDO
Shares: 20,000
Est. Value: $4.74M
Form 4
Insider Selling
2026-02-09
MRK insider Guindo Chirfi (Chief Marketing Officer) sold 10,000 shares (~$1.18M)
Guindo Chirfi, listed as Chief Marketing Officer at Merck & Co., Inc., reported an open-market sale of 10,000 MRK shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
Filing: Form 4 (Insider Transaction)
Insider: Guindo Chirfi (Chief Marketing Officer)
Shares: 10,000
Est. Value: $1.18M
Form 4
Insider Selling
2026-02-09
MRK insider Zachary Jennifer (EVP, General Counsel) sold 121,573 shares (~$14.49M)
Zachary Jennifer, listed as EVP, General Counsel at Merck & Co., Inc., reported an open-market sale of 121,573 MRK shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
Filing: Form 4 (Insider Transaction)
Insider: Zachary Jennifer (EVP, General Counsel)
Shares: 121,573
Est. Value: $14.49M
Form 144
Large Proposed Insider Sale
2026-02-06
MRK Form 144 filed for proposed insider sale by RICHARD ROBERT DELUCA JR. (37,685 shares) ~$9.11M
RICHARD ROBERT DELUCA JR. filed a Form 144 with the SEC indicating intent to sell MRK (Merck & Co., Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.
Filing: Form 144 (Proposed Sale Notice)
Insider: RICHARD ROBERT DELUCA JR.
Shares: 37,685
Est. Value: $9.11M
Form 144
Proposed Insider Sale
2026-02-06
MRK Form 144 filed for proposed insider sale by DAVID WILLIAMS (5,000 shares) ~$1.22M
DAVID WILLIAMS filed a Form 144 with the SEC indicating intent to sell MRK (Merck & Co., Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.
Filing: Form 144 (Proposed Sale Notice)
Insider: DAVID WILLIAMS
Shares: 5,000
Est. Value: $1.22M
Form 4
Insider Selling
2026-02-06
MRK insider Williams David Michael (EVP,Chief Info&Digital Officer) sold 5,000 shares (~$609.5K)
Williams David Michael, listed as EVP,Chief Info&Digital Officer at Merck & Co., Inc., reported an open-market sale of 5,000 MRK shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
Filing: Form 4 (Insider Transaction)
Insider: Williams David Michael (EVP,Chief Info&Digital Officer)
Shares: 5,000
Est. Value: $609.5K
Form 144
Proposed Insider Sale
2026-02-06
MRK Form 144 filed for proposed insider sale by JOHANNES JACOBUS OOSTHUIZEN (15,000 shares) ~$3.66M
JOHANNES JACOBUS OOSTHUIZEN filed a Form 144 with the SEC indicating intent to sell MRK (Merck & Co., Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.
Filing: Form 144 (Proposed Sale Notice)
Insider: JOHANNES JACOBUS OOSTHUIZEN
Shares: 15,000
Est. Value: $3.66M