MRK
Merck (MRK)
NYSE
$153.33+$0.77 (+0.51%)
Price as of Aug 21, 2026 7:59 PM EDT
  • $367.6B
    Market Cap
  • 80.44%
    1-Year Change
  • Drug Manufacturers - General
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
VANGUARD GROUP INC
10.30%
254.3M
+2.2M (+0.86%)
Dec 31, 2025
BLACKROCK, INC.
9.19%
227.0M
+1.2M (+0.52%)
Jun 30, 2026
BLACKROCK FUNDING, INC. /DE
8.99%
222.1M
+10.0M (+4.51%)
Dec 31, 2024
BLACKROCK INC.
8.39%
207.3M
+279,840 (+0.13%)
Jun 30, 2024
VANGUARD CAPITAL MANAGEMENT LLC
6.53%
161.3M
+335,550 (+0.21%)
Jun 30, 2026
STATE STREET CORP
4.88%
120.4M
+1.1M (+0.90%)
Jun 30, 2026
WELLINGTON MANAGEMENT GROUP LLP
3.49%
86.2M
+1.9M (+2.24%)
Jun 30, 2026

Current Ownership Distribution

  • Institutions36.2B (77.73%)
  • Mutual Funds10.4B (22.25%)
  • Insiders5.6M (0.01%)
  • Other0 (0.00%)

Insider Transactions

  • 0.01% (5.6M)
    Current InsiderOwnership (%, shares)
  • 0
    Number of InsiderBuying (last 12 months)
  • $0.00
    Amount of InsiderBuying (last 12 months)
  • 5
    Number of InsiderSelling (last 12 months)
  • $157.8M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Guindo Chirfi
EVP, Access, Policy & Comms
Sell
Aug 13, 2026
$1.4M
10,000
$135.00
36,613
Zachary Jennifer
EVP, General Counsel
Exempt
Aug 12, 2026
$0.00
41,494
$0.00
0
DeLuca Richard R.
EVP&Pres, Merck Animal Heallth
Sell
Aug 12, 2026
$1.5M
11,099
$131.61
110,767
Zachary Jennifer
EVP, General Counsel
Exempt
Aug 12, 2026
$0.00
13,433
$0.00
0
DeLuca Richard R.
EVP&Pres, Merck Animal Heallth
Sell
Aug 12, 2026
$79,222.02
600
$132.04
110,167
Zachary Jennifer
EVP, General Counsel
Exempt
Aug 12, 2026
$4.9M
41,494
$117.89
112,391
Zachary Jennifer
EVP, General Counsel
Exempt
Aug 12, 2026
$1.1M
13,433
$84.71
125,824
Zachary Jennifer
EVP, General Counsel
Sell
Aug 12, 2026
$10.7M
80,315
$133.46
45,509
DeLuca Richard R.
EVP&Pres, Merck Animal Heallth
Sell
Aug 11, 2026
$973,164.93
7,410
$131.33
127,293
DeLuca Richard R.
EVP&Pres, Merck Animal Heallth
Sell
Aug 11, 2026
$718,261.28
5,427
$132.35
121,866
DeLuca Richard R.
EVP&Pres, Merck Animal Heallth
Sell
Aug 10, 2026
$2.7M
20,784
$130.43
134,703
DeLuca Richard R.
EVP&Pres, Merck Animal Heallth
Sell
Aug 06, 2026
$105,472.39
805
$131.02
160,732
Guindo Chirfi
EVP, Access, Policy & Comms
Sell
Aug 06, 2026
$2.0M
15,000
$131.00
46,613
DeLuca Richard R.
EVP&Pres, Merck Animal Heallth
Sell
Aug 06, 2026
$643,993.28
4,945
$130.23
155,787
DeLuca Richard R.
EVP&Pres, Merck Animal Heallth
Sell
Aug 06, 2026
$39,306.99
300
$131.02
155,487
Maraldo David R.
EVP & Pres. MMD
Exempt
Aug 05, 2026
$0.00
6,311
$0.00
3,154
Williams David Michael
EVP,Chief Info&Digital Officer
Exempt
Aug 05, 2026
$0.00
4,600
$0.00
0
Maraldo David R.
EVP & Pres. MMD
Exempt
Aug 05, 2026
$0.00
9,709
$0.00
0
Williams David Michael
EVP,Chief Info&Digital Officer
Exempt
Aug 05, 2026
$0.00
13,542
$0.00
0
Maraldo David R.
EVP & Pres. MMD
Exempt
Aug 05, 2026
$0.00
2,686
$0.00
5,374
Williams David Michael
EVP,Chief Info&Digital Officer
Exempt
Aug 05, 2026
$0.00
34,705
$0.00
0
Maraldo David R.
EVP & Pres. MMD
Exempt
Aug 05, 2026
$465,310.03
6,311
$73.73
24,523
Williams David Michael
EVP,Chief Info&Digital Officer
Exempt
Aug 05, 2026
$357,052.00
4,600
$77.62
36,316
Maraldo David R.
EVP & Pres. MMD
Sell
Aug 05, 2026
$812,338.67
6,311
$128.72
18,212
Williams David Michael
EVP,Chief Info&Digital Officer
Sell
Aug 05, 2026
$592,345.22
4,600
$128.77
31,716
Maraldo David R.
EVP & Pres. MMD
Exempt
Aug 05, 2026
$845,653.90
9,709
$87.10
27,921
Williams David Michael
EVP,Chief Info&Digital Officer
Exempt
Aug 05, 2026
$1.0M
13,542
$75.36
45,258
Maraldo David R.
EVP & Pres. MMD
Sell
Aug 05, 2026
$1.2M
9,709
$128.72
18,212
Williams David Michael
EVP,Chief Info&Digital Officer
Sell
Aug 05, 2026
$1.7M
13,542
$128.77
31,716
Maraldo David R.
EVP & Pres. MMD
Exempt
Aug 05, 2026
$227,531.06
2,686
$84.71
20,898