MRK

insider transactions

Merck & Co., Inc. — buys & sells by directors, officers and 10% owners (SEC Form 4).

30D 90D 1Y

No open-market buys or sells this period. The trades below are grants, option exercises and gifts, which carry no market price.

Net buy / sell volume

Tap or hover the chart for daily net volume. Green = net buying, red = net selling.

All transactions

Grant·A
Jun 4, 26

Stephen Mayo

Director

—

16.9K sh

Own +956%
Grant·A
May 29, 26

Kathy J Warden

Director

$220.0K

1.9K sh · $118.72

Own +12%
Grant·A
May 29, 26

Inge G Thulin

Director

$220.0K

1.9K sh · $118.72

Own +7%
Grant·A
May 29, 26

Christine E Seidman

Director

$220.0K

1.9K sh · $118.72

Own +10%
Grant·A
May 29, 26

Patricia F Russo

Director

$220.0K

1.9K sh · $118.72

Own +3%
Grant·A
May 29, 26

Paul Rothman

Director

$220.0K

1.9K sh · $118.72

Own +6%
Grant·A
May 29, 26

Stephen Mayo

Director

$220.0K

1.9K sh · $118.72

Own +14%
Grant·A
May 29, 26

Risa J Lavizzo-Mourey

Director

$220.0K

1.9K sh · $118.72

Own +12%
Grant·A
May 29, 26

Surendralal Lanca Karsanbhai

Director

$220.0K

1.9K sh · $118.72

Own +52%
Grant·A
May 29, 26

Pamela J. Craig

Director

$220.0K

1.9K sh · $118.72

Own +6%
Grant·A
May 29, 26

Mary Ellen Coe

Director

$220.0K

1.9K sh · $118.72

Own +6%
Grant·A
May 29, 26

Douglas M Baker JR

Director

$220.0K

1.9K sh · $118.72

Own +19%

Date▾	Insider	Role	Type	Shares	Own Δ	Price	Value
Jun 4, 2026	Stephen Mayo	Director	Grant A	16.9K	+956%	—	—
May 29, 2026	Kathy J Warden	Director	Grant A	1.9K	+12%	$118.72	$220.0K
May 29, 2026	Inge G Thulin	Director	Grant A	1.9K	+7%	$118.72	$220.0K
May 29, 2026	Christine E Seidman	Director	Grant A	1.9K	+10%	$118.72	$220.0K
May 29, 2026	Patricia F Russo	Director	Grant A	1.9K	+3%	$118.72	$220.0K
May 29, 2026	Paul Rothman	Director	Grant A	1.9K	+6%	$118.72	$220.0K
May 29, 2026	Stephen Mayo	Director	Grant A	1.9K	+14%	$118.72	$220.0K
May 29, 2026	Risa J Lavizzo-Mourey	Director	Grant A	1.9K	+12%	$118.72	$220.0K
May 29, 2026	Surendralal Lanca Karsanbhai	Director	Grant A	1.9K	+52%	$118.72	$220.0K
May 29, 2026	Pamela J. Craig	Director	Grant A	1.9K	+6%	$118.72	$220.0K
May 29, 2026	Mary Ellen Coe	Director	Grant A	1.9K	+6%	$118.72	$220.0K
May 29, 2026	Douglas M Baker JR	Director	Grant A	1.9K	+19%	$118.72	$220.0K

About MRK insider trading

This page tracks insider transactions for Merck & Co., Inc. (MRK) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.