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Investment Visual

MRK

Merck & Co., Inc.

$147.76+0.81 (+0.55%)Close Nov 13, 2026

Backtest MRK

Insider trading

12 months to Nov 3, 2026
Sold
$71.3M
11 insiders
Largest seller
$25.2M
Jennifer Zachary · 35% of sales
Bought
$0
No buys
Latest buy
Feb 6, 2025
Inge G. Thulin

Buys and sales on the price

Since 2003

By period

Open-market trades
Trades3 months12 monthsSince 2003
Buys0018
Sales922243
Plan sales0059
Shares bought0000497,542498K
Shares sold228,238228K575,734576K15,525,69215.5M
Net shares−228,238−228K−575,734−576K−15,028,150−15.0M
Net value−$30.0M−$71.3M−$1.16B

Insiders

Insider12 monthsShares held
Robert M. Davis
Chairman, CEO & President, Director
−10.7%
450,351
Richard R. DeLuca
EVP&Pres, Merck Animal Heallth
−49.4%
111,488
Dean Y. Li
Executive VP & President, MRL
−31.8%
94,431
Caroline Litchfield
EVP & CFO
−56.5%
92,301
Jennifer Zachary
EVP, General Counsel
−365.2%
45,509

Trades

261 trades since 2003
TypeInsiderRoleSharesPriceHeld after
Aug 13, 2026Sale
Chirfi GuindoEVP, Access, Policy & Comms
EVP, Access, Policy & Comms
EVP, Access, Policy & Comms
10,000
at $135.00
$135.00$1.35M
−21.4%
36.7K after
36,670
Aug 12, 2026Sale
Jennifer ZacharyEVP, General Counsel
EVP, General Counsel
EVP, General Counsel
80,315
at $133.46
$133.46$10.7M
−63.8%
45.5K after
45,509
Aug 12, 2026Sale
Richard R. DeLucaEVP&Pres, Merck Animal Heallth
EVP&Pres, Merck Animal Heallth
EVP&Pres, Merck Animal Heallth
11,699
at $131.63
$131.63$1.54M
−9.5%
111K after
111,488
Aug 11, 2026Sale
Richard R. DeLucaEVP&Pres, Merck Animal Heallth
EVP&Pres, Merck Animal Heallth
EVP&Pres, Merck Animal Heallth
12,837
at $131.76
$131.76$1.69M
−9.4%
123K after
123,187
Aug 10, 2026Sale
Richard R. DeLucaEVP&Pres, Merck Animal Heallth
EVP&Pres, Merck Animal Heallth
EVP&Pres, Merck Animal Heallth
20,784
at $130.43
$130.43$2.71M
−13.3%
136K after
136,024
Aug 6, 2026Sale
Richard R. DeLucaEVP&Pres, Merck Animal Heallth
EVP&Pres, Merck Animal Heallth
EVP&Pres, Merck Animal Heallth
6,050
at $130.38
$130.38$789K
−3.7%
157K after
156,808
Aug 6, 2026Sale
Chirfi GuindoEVP, Access, Policy & Comms
EVP, Access, Policy & Comms
EVP, Access, Policy & Comms
15,000
at $131.00
$131.00$1.97M
−24.3%
Changed by trades not shown: 46.7K after
Changed by trades not shown: 46,670
Aug 5, 2026Sale
David R. MaraldoEVP & Pres. MMD
EVP & Pres. MMD
EVP & Pres. MMD
18,706
at $128.72
$128.72$2.41M
−41.3%
26.6K after
26,572
Aug 5, 2026Sale
David Michael WilliamsEVP,Chief Info&Digital Officer
EVP,Chief Info&Digital Officer
EVP,Chief Info&Digital Officer
52,847
at $128.77
$128.77$6.81M
−62.5%
31.7K after
31,716
Feb 12, 2026Sale
Chirfi GuindoChief Marketing Officer
Chief Marketing Officer
Chief Marketing Officer
10,000
at $121.46
$121.46$1.21M
−14.1%
60.7K after
60,672
  • Chirfi Guindo$1.35M
    Aug 13, 2026 · Sale10,000 at $135.00
    EVP, Access, Policy & Comms−21.4% of holdings, 36.7K after
  • Jennifer Zachary$10.7M
    Aug 12, 2026 · Sale80,315 at $133.46
    EVP, General Counsel−63.8% of holdings, 45.5K after
  • Richard R. DeLuca$1.54M
    Aug 12, 2026 · Sale11,699 at $131.63
    EVP&Pres, Merck Animal Heallth−9.5% of holdings, 111K after
  • Richard R. DeLuca$1.69M
    Aug 11, 2026 · Sale12,837 at $131.76
    EVP&Pres, Merck Animal Heallth−9.4% of holdings, 123K after
  • Richard R. DeLuca$2.71M
    Aug 10, 2026 · Sale20,784 at $130.43
    EVP&Pres, Merck Animal Heallth−13.3% of holdings, 136K after
  • Richard R. DeLuca$789K
    Aug 6, 2026 · Sale6,050 at $130.38
    EVP&Pres, Merck Animal Heallth−3.7% of holdings, 157K after
  • Chirfi Guindo$1.97M
    Aug 6, 2026 · Sale15,000 at $131.00
    EVP, Access, Policy & Comms−24.3% of holdings, Changed by trades not shown: 46.7K after
  • David R. Maraldo$2.41M
    Aug 5, 2026 · Sale18,706 at $128.72
    EVP & Pres. MMD−41.3% of holdings, 26.6K after
  • David Michael Williams$6.81M
    Aug 5, 2026 · Sale52,847 at $128.77
    EVP,Chief Info&Digital Officer−62.5% of holdings, 31.7K after
  • Chirfi Guindo$1.21M
    Feb 12, 2026 · Sale10,000 at $121.46
    Chief Marketing Officer−14.1% of holdings, 60.7K after