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Atom Investors’s Disc Medicine IRON Stock Holding History

Atom Investors’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 		$778K Buy
+12,162
New +$844K 0.06% 402
2025
Q2 		– Sell
-22,561
Closed -$1.12M – 697
2025
Q1 		$1.12M Buy
+22,561
New +$1.25M 0.14% 199
2021
Q4 		– Sell
-3,426
Closed -$415K – 340
2021
Q3 		$415K Buy
+3,426
New +$468K 0.03% 216

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

Atom Investors's IRON Position: Q1 2026 in Review

Atom Investors opened a new position in Disc Medicine (IRON) in Q1 2026: 12,162 shares worth $778K. The stake represents 0.06% of the portfolio and ranks #402 among its holdings. This is a return to the name: Atom Investors previously reported a position in IRON as recently as Q1 2025.

Atom Investors first reported a position in IRON in Q3 2021 and has held it in 3 quarters since. The position peaked at $1.12M in Q1 2025. 203 funds tracked by Wall St. Rank hold IRON as of Q1 2026.

  • Atom Investors held 12,162 shares of Disc Medicine worth $778K as of Q1 2026.
  • Disc Medicine was a new Atom Investors position in Q1 2026.
  • Disc Medicine made up 0.06% of Atom Investors's portfolio in Q1 2026, its #402 holding.
  • Atom Investors first reported a position in Disc Medicine in Q3 2021 and has held it in 3 quarters since.
  • Atom Investors's Disc Medicine position peaked at $1.12M in Q1 2025.
  • 203 funds tracked by Wall St. Rank held Disc Medicine as of Q1 2026.

Based on Atom Investors's 13F filing for Q1 2026, filed 15 May 2026.