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MRK SEC Filing News — Merck & Co., Inc.

Latest SEC filings for Merck & Co., Inc. (MRK) explained in plain English: insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). Sourced directly from SEC EDGAR.

What you’re looking at: Each item below is parsed from an actual SEC filing. Form 4 = confirmed insider transaction · Form 144 = proposed sale notice · 8-K = material event (earnings, M&A, leadership change, etc.) · 10-Q / 10-K = quarterly / annual report.
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
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