Jane Street
IRON icon

Jane Street’s Disc Medicine IRON Stock Holding History

Jane Street’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
Q3 		$16.1M Buy
245,230
+229,219
+1,432% +$17.3M ﹤0.01% 2290
2026
Q2 		$1.17M Buy
+16,011
New +$1.1M ﹤0.01% 6196
2025
Q4 		– Sell
-21,274
Closed -$1.8M – 11752
2025
Q3 		$1.41M Buy
+21,274
New +$1.27M ﹤0.01% 5602
2025
Q1 		– Sell
-21,203
Closed -$1.34M – 9996
2024
Q4 		$1.34M Sell
21,203
-3,528
-14% -$204K ﹤0.01% 4849
2024
Q3 		$1.22M Sell
24,731
-7,680
-24% -$361K ﹤0.01% 5490
2024
Q2 		$1.46M Sell
32,411
-8,405
-21% -$286K ﹤0.01% 5060
2024
Q1 		$2.54M Buy
40,816
+19,971
+96% +$1.29M ﹤0.01% 3703
2023
Q4 		$1.2M Buy
20,845
+10,196
+96% +$522K ﹤0.01% 5229
2023
Q3 		$500K Buy
+10,649
New +$533K ﹤0.01% 6303
2023
Q2 		– Sell
-19,252
Closed -$408K – 9119
2023
Q1 		$408K Buy
+19,252
New +$429K ﹤0.01% 6678
2022
Q1 		– Sell
-1,245
Closed -$109K – 10659
2021
Q4 		$109K Buy
+1,245
New +$122K ﹤0.01% 9200

Other funds holding IRON

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.32T AUM 44.66% 1-Year Est. Return
BlackRock
BlackRock New York $6.79T AUM 37.06% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.84T AUM 33.86% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return
Atlas Venture Life Science Advisors
Atlas Venture Life Science Advisors Cambridge, Massachusetts $631M AUM 38.42% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.76T AUM
Assenagon Asset Management
Assenagon Asset Management Senningerberg, Luxembourg $103B AUM 40.17% 1-Year Est. Return
SL
Siren LLC Greenwich, Connecticut $4.23B AUM 121.47% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
Aberdeen Group
Aberdeen Group Edinburgh, United Kingdom $72.4B AUM 31.32% 1-Year Est. Return

Jane Street's IRON Position: Q3 2026 in Review

Jane Street increased its Disc Medicine (IRON) stake by 1,432% in Q3 2026, buying an estimated $17.3M and bringing the position to 245,230 shares worth $16.1M. The position accounts for ﹤0.01% of the portfolio, ranked #2290.

Jane Street first reported a position in IRON in Q4 2021 and has held it in 11 quarters since. 150 funds tracked by Wall St. Rank hold IRON as of Q3 2026.

  • Jane Street held 245,230 shares of Disc Medicine worth $16.1M as of Q3 2026.
  • Jane Street bought 229,219 Disc Medicine shares in Q3 2026, an estimated $17.3M.
  • Disc Medicine made up ﹤0.01% of Jane Street's portfolio in Q3 2026, its #2290 holding.
  • Jane Street first reported a position in Disc Medicine in Q4 2021 and has held it in 11 quarters since.
  • 150 funds tracked by Wall St. Rank held Disc Medicine as of Q3 2026.

Based on Jane Street's 13F filing for Q3 2026, filed 12 Nov 2026.