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 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 Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

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 New York $1.81T AUM 41.13% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return

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 Malvern, Pennsylvania $4.68T AUM

Jane Street's IRON Position: Q2 2026 in Review

Jane Street opened a new position in Disc Medicine (IRON) in Q2 2026: 16,011 shares worth $1.17M. The stake represents ﹤0.01% of the portfolio and ranks #6196 among its holdings. This is a return to the name: Jane Street previously reported a position in IRON as recently as Q3 2025.

Jane Street first reported a position in IRON in Q4 2021 and has held it in 10 quarters since. The position peaked at $2.54M in Q1 2024. 216 funds tracked by Wall St. Rank hold IRON as of Q2 2026.

Jane Street held 16,011 shares of Disc Medicine worth $1.17M as of Q2 2026.
Disc Medicine was a new Jane Street position in Q2 2026.
Disc Medicine made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #6196 holding.
Jane Street first reported a position in Disc Medicine in Q4 2021 and has held it in 10 quarters since.
Jane Street's Disc Medicine position peaked at $2.54M in Q1 2024.
216 funds tracked by Wall St. Rank held Disc Medicine as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.