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Siren LLC’s Disc Medicine IRON Stock Holding History

Siren LLC’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
Q2 		$65M Sell
888,401
-100,000
-10% -$6.87M 1.32% 26
2026
Q1 		$63.2M Hold
988,401
– – 1.75% 19
2025
Q4 		$78.5M Buy
988,401
+75,000
+8% +$6.34M 2.34% 10
2025
Q3 		$60.4M Sell
913,401
-186,000
-17% -$11.1M 2.36% 9
2025
Q2 		$58.2M Buy
1,099,401
+27,536
+3% +$1.29M 3.01% 4
2025
Q1 		$53.2M Buy
+1,071,865
New +$59.6M 3% 7

Other funds holding IRON

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
RCM
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
VPC
Vestal Point Capital New York $4.28B AUM 239% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $881M AUM 160.77% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Siren LLC's IRON Position: Q2 2026 in Review

Siren LLC reduced its Disc Medicine (IRON) stake by 10% in Q2 2026, selling an estimated $6.87M and leaving 888,401 shares worth $65M. The position accounts for 1.32% of the portfolio, ranked #26.

Siren LLC first reported a position in IRON in Q1 2025 and has held it in 6 quarters since. The position peaked at $78.5M in Q4 2025. 216 funds tracked by Wall St. Rank hold IRON as of Q2 2026.

  • Siren LLC held 888,401 shares of Disc Medicine worth $65M as of Q2 2026.
  • Siren LLC sold 100,000 Disc Medicine shares in Q2 2026, an estimated $6.87M.
  • Disc Medicine made up 1.32% of Siren LLC's portfolio in Q2 2026, its #26 holding.
  • Siren LLC first reported a position in Disc Medicine in Q1 2025 and has held it in 6 quarters since.
  • Siren LLC's Disc Medicine position peaked at $78.5M in Q4 2025.
  • 216 funds tracked by Wall St. Rank held Disc Medicine as of Q2 2026.

Based on Siren LLC's 13F filing for Q2 2026, filed 13 Aug 2026.