Zimmer Partners’s Disc Medicine IRON Stock Holding History

Zimmer Partners’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	$1.07M	Sell	16,700 -10,800	-39%	-$749K	0.03%	117
2025 Q4	$2.18M	Sell	27,500 -62,663	-69%	-$5.29M	0.06%	93
2025 Q3	$5.96M	Hold	90,163	–	–	0.13%	95
2025 Q2	$4.78M	Buy	90,163 +47,263	+110%	+$2.22M	0.1%	112
2025 Q1	$2.13M	Buy	42,900 +9,800	+30%	+$545K	0.04%	151
2024 Q4	$2.1M	Sell	33,100 -1,300	-4%	-$75.2K	0.04%	131
2024 Q3	$1.69M	Hold	34,400	–	–	0.03%	135
2024 Q2	$1.55M	Buy	+34,400	New	+$1.17M	0.03%	132

Other funds holding IRON

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 New York $5.72T AUM 30.48% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

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

Zimmer Partners's IRON Position: Q1 2026 in Review

Zimmer Partners reduced its Disc Medicine (IRON) stake by 39% in Q1 2026, selling an estimated $749K and leaving 16,700 shares worth $1.07M. The position accounts for 0.03% of the portfolio, ranked #117.

Zimmer Partners first reported a position in IRON in Q2 2024 and has held it in 8 quarters since. The position peaked at $5.96M in Q3 2025. 203 funds tracked by Wall St. Rank hold IRON as of Q1 2026.

Zimmer Partners held 16,700 shares of Disc Medicine worth $1.07M as of Q1 2026.
Zimmer Partners sold 10,800 Disc Medicine shares in Q1 2026, an estimated $749K.
Disc Medicine made up 0.03% of Zimmer Partners's portfolio in Q1 2026, its #117 holding.
Zimmer Partners first reported a position in Disc Medicine in Q2 2024 and has held it in 8 quarters since.
Zimmer Partners's Disc Medicine position peaked at $5.96M in Q3 2025.
203 funds tracked by Wall St. Rank held Disc Medicine as of Q1 2026.

Based on Zimmer Partners's 13F filing for Q1 2026, filed 15 May 2026.