Marshall Wace
MRK icon

Marshall Wace’s Merck MRK Stock Holding History

Marshall Wace’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
2025
Q4 		– Sell
-518,200
Closed -$43.5M – 3276
2025
Q3 		$43.5M Buy
518,200
+350,200
+208% +$28.8M 0.04% 363
2025
Q2 		$13.3M Buy
+168,000
New +$13.4M 0.02% 733
2025
Q1 		– Sell
-140,000
Closed -$13.9M – 2914
2024
Q4 		$13.9M Buy
+140,000
New +$14.4M 0.02% 674
2021
Q4 		– Sell
-71,000
Closed -$5.33M – 4146
2021
Q3 		$5.33M Buy
+71,000
New +$5.4M 0.02% 901

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

Marshall Wace's MRK Position: Q1 2026 in Review

Marshall Wace reduced its Merck (MRK) stake by 30% in Q1 2026, selling an estimated $138M and leaving 2,778,301 shares worth $334M. The position accounts for 0.33% of the portfolio, ranked #35.

Marshall Wace first reported a position in MRK in Q2 2014 and has held it in 41 quarters since. The position peaked at $557M in Q1 2022. 3,778 funds tracked by Wall St. Rank hold MRK as of Q1 2026.

  • Marshall Wace held 2,778,301 shares of Merck worth $334M as of Q1 2026.
  • Marshall Wace sold 1,191,168 Merck shares in Q1 2026, an estimated $138M.
  • Merck made up 0.33% of Marshall Wace's portfolio in Q1 2026, its #35 holding.
  • Marshall Wace first reported a position in Merck in Q2 2014 and has held it in 41 quarters since.
  • Marshall Wace's Merck position peaked at $557M in Q1 2022.
  • 3,778 funds tracked by Wall St. Rank held Merck as of Q1 2026.

Based on Marshall Wace's 13F filing for Q1 2026, filed 15 May 2026.