Marshall Wace
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Marshall Wace’s Disc Medicine IRON Stock Holding History

Marshall Wace’s Portfolio IRON Stock Details IRON Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-4,642
Closed -$369K – 3450
2025
Q4 		$369K Sell
4,642
-9,359
-67% -$791K ﹤0.01% 2372
2025
Q3 		$925K Buy
+14,001
New +$833K ﹤0.01% 1968
2024
Q3 		– Sell
-12,300
Closed -$554K – 2731
2024
Q2 		$554K Buy
+12,300
New +$418K ﹤0.01% 1921

Other funds holding IRON

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
RCM
RA Capital Management Boston, Massachusetts $9.44B AUM 157.3% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $790M AUM 223.66% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
FLSM
Frazier Life Sciences Management Palo Alto, California $3.89B AUM 201.1% 1-Year Est. Return
TCM
TCG Crossover Management Palo Alto, California $3.5B AUM 1,165.83% 1-Year Est. Return

Marshall Wace's IRON Position: Q1 2026 in Review

Marshall Wace sold out of Disc Medicine (IRON) in Q1 2026, closing a stake of 4,642 shares — an estimated $369K sold.

Marshall Wace first reported a position in IRON in Q2 2024 and held it in 3 quarters. The position peaked at $925K in Q3 2025. 203 funds tracked by Wall St. Rank hold IRON as of Q1 2026.

  • Marshall Wace reported no remaining Disc Medicine position as of Q1 2026 after selling out during the quarter.
  • Marshall Wace sold 4,642 Disc Medicine shares in Q1 2026, an estimated $369K.
  • Marshall Wace first reported a position in Disc Medicine in Q2 2024 and held it in 3 quarters.
  • Marshall Wace's Disc Medicine position peaked at $925K in Q3 2025.
  • 203 funds tracked by Wall St. Rank held Disc Medicine as of Q1 2026.

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