William Blair & Company
MRK icon

William Blair & Company’s Merck MRK Stock Holding History

William Blair & Company’s Portfolio MRK Stock Details MRK Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$108M Buy
901,789
+67,765
+8% +$7.82M 0.31% 78
2025
Q4 		$87.8M Buy
834,024
+21,658
+3% +$2.03M 0.24% 105
2025
Q3 		$68.2M Sell
812,366
-60,101
-7% -$4.95M 0.18% 122
2025
Q2 		$69.1M Sell
872,467
-68,932
-7% -$5.48M 0.19% 120
2025
Q1 		$84.5M Sell
941,399
-67,564
-7% -$6.31M 0.25% 89
2024
Q4 		$100M Buy
1,008,963
+6,634
+0.7% +$684K 0.29% 83
2024
Q3 		$114M Buy
1,002,329
+3,558
+0.4% +$423K 0.33% 73
2024
Q2 		$124M Buy
998,771
+260,742
+35% +$33.6M 0.38% 63
2024
Q1 		$97.4M Buy
738,029
+313
+0% +$38.6K 0.31% 77
2023
Q4 		$80.4M Buy
737,716
+15,121
+2% +$1.57M 0.27% 88
2023
Q3 		$74.4M Buy
722,595
+4,288
+0.6% +$462K 0.29% 83
2023
Q2 		$82.9M Buy
718,307
+16,435
+2% +$1.87M 0.3% 79
2023
Q1 		$74.7M Buy
701,872
+6,275
+0.9% +$677K 0.3% 81
2022
Q4 		$77.2M Buy
695,597
+10,461
+2% +$1.07M 0.34% 74
2022
Q3 		$59M Buy
685,136
+43,408
+7% +$3.88M 0.27% 89
2022
Q2 		$58.5M Buy
641,728
+2,436
+0.4% +$216K 0.26% 95
2022
Q1 		$52.5M Sell
639,292
-84,408
-12% -$6.65M 0.18% 119
2021
Q4 		$55.5M Buy
723,700
+42,370
+6% +$3.37M 0.17% 125
2021
Q3 		$51.2M Buy
681,330
+55,013
+9% +$4.18M 0.17% 123
2021
Q2 		$48.7M Sell
626,317
-40,548
-6% -$3.02M 0.17% 131
2021
Q1 		$49.1M Sell
666,865
-31,920
-5% -$2.35M 0.19% 124
2020
Q4 		$54.5M Buy
698,785
+83,608
+14% +$6.39M 0.2% 110
2020
Q3 		$48.7M Buy
615,177
+81,365
+15% +$6.37M 0.21% 102
2020
Q2 		$39.4M Buy
533,812
+20,888
+4% +$1.57M 0.19% 119
2020
Q1 		$37.7M Sell
512,924
-47,060
-8% -$3.7M 0.24% 92
2019
Q4 		$48.6M Sell
559,984
-17,681
-3% -$1.45M 0.25% 93
2019
Q3 		$46.4M Buy
577,665
+29,316
+5% +$2.35M 0.27% 86
2019
Q2 		$43.9M Buy
548,349
+47,951
+10% +$3.67M 0.25% 97
2019
Q1 		$39.7M Buy
500,398
+54,607
+12% +$4.08M 0.24% 100
2018
Q4 		$32.5M Buy
445,791
+15,472
+4% +$1.09M 0.24% 101
2018
Q3 		$29.1M Buy
430,319
+2,703
+0.6% +$172K 0.18% 127
2018
Q2 		$24.8M Sell
427,616
-1,359
-0.3% -$76.7K 0.17% 129
2018
Q1 		$22.3M Sell
428,975
-22,504
-5% -$1.22M 0.16% 136
2017
Q4 		$24.2M Buy
451,479
+1,242
+0.3% +$68.9K 0.16% 139
2017
Q3 		$27.5M Buy
450,237
+10,569
+2% +$641K 0.21% 120
2017
Q2 		$26.9M Buy
439,668
+84,291
+24% +$5.13M 0.2% 122
2017
Q1 		$22M Buy
355,377
+15,622
+5% +$948K 0.18% 137
2016
Q4 		$19.1M Buy
339,755
+2,662
+0.8% +$156K 0.17% 149
2016
Q3 		$20.1M Buy
337,093
+11,295
+3% +$661K 0.18% 145
2016
Q2 		$17.9M Buy
325,798
+1,068
+0.3% +$56.8K 0.17% 150
2016
Q1 		$16.4M Sell
324,730
-23,630
-7% -$1.16M 0.15% 157
2015
Q4 		$17.6M Buy
348,360
+25,408
+8% +$1.28M 0.16% 143
2015
Q3 		$15.2M Buy
322,952
+5,540
+2% +$294K 0.13% 178
2015
Q2 		$17.2M Buy
317,412
+8,605
+3% +$483K 0.03% 703
2015
Q1 		$16.9M Sell
308,807
-1,012
-0.3% -$57.3K 0.03% 668
2014
Q4 		$16.8M Buy
309,819
+24,745
+9% +$1.38M 0.03% 653
2014
Q3 		$16.1M Buy
285,074
+861
+0.3% +$48.3K 0.03% 658
2014
Q2 		$15.7M Sell
284,213
-23,776
-8% -$1.3M 0.03% 671
2014
Q1 		$16.7M Buy
307,989
+49,167
+19% +$2.55M 0.03% 634
2013
Q4 		$12.4M Sell
258,822
-57,821
-18% -$2.64M 0.02% 732
2013
Q3 		$14.4M Sell
316,643
-5,340
-2% -$244K 0.03% 616
2013
Q2 		$14.3M Buy
+321,983
New +$14.4M 0.03% 582

Other funds holding MRK

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
Charles Schwab
Charles Schwab San Francisco, California $654B AUM 26.35% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

William Blair & Company's MRK Position: Q1 2026 in Review

William Blair & Company increased its Merck (MRK) stake by 8.1% in Q1 2026, buying an estimated $7.82M and bringing the position to 901,789 shares worth $108M. The position accounts for 0.31% of the portfolio, ranked #78.

William Blair & Company first reported a position in MRK in Q2 2013 and has held it in 52 quarters since. The position peaked at $124M in Q2 2024. 3,779 funds tracked by Wall St. Rank hold MRK as of Q1 2026.

  • William Blair & Company held 901,789 shares of Merck worth $108M as of Q1 2026.
  • William Blair & Company bought 67,765 Merck shares in Q1 2026, an estimated $7.82M.
  • Merck made up 0.31% of William Blair & Company's portfolio in Q1 2026, its #78 holding.
  • William Blair & Company first reported a position in Merck in Q2 2013 and has held it in 52 quarters since.
  • William Blair & Company's Merck position peaked at $124M in Q2 2024.
  • 3,779 funds tracked by Wall St. Rank held Merck as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.