Ken Griffin
IRON icon

Ken Griffin’s Disc Medicine IRON Stock Holding History

Ken Griffin’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 		$6.26M Sell
97,930
-2,465
-2% -$171K ﹤0.01% 3982
2025
Q4 		$7.97M Buy
100,395
+50,001
+99% +$4.22M ﹤0.01% 3562
2025
Q3 		$3.33M Buy
+50,394
New +$3M ﹤0.01% 5118
2025
Q2 		– Sell
-62,214
Closed -$2.92M – 13769
2025
Q1 		$3.09M Sell
62,214
-529,057
-89% -$29.4M ﹤0.01% 4712
2024
Q4 		$37.5M Buy
591,271
+180,247
+44% +$10.4M 0.01% 1532
2024
Q3 		$20.2M Buy
411,024
+89,503
+28% +$4.2M ﹤0.01% 2040
2024
Q2 		$14.5M Sell
321,521
-4,203
-1% -$143K ﹤0.01% 2355
2024
Q1 		$20.3M Buy
325,724
+137,800
+73% +$8.93M ﹤0.01% 2050
2023
Q4 		$10.9M Sell
187,924
-122,507
-39% -$6.27M ﹤0.01% 2727
2023
Q3 		$14.6M Sell
310,431
-340,889
-52% -$17.1M ﹤0.01% 2219
2023
Q2 		$28.9M Buy
651,320
+480,082
+280% +$17M 0.01% 1511
2023
Q1 		$3.63M Buy
171,238
+115,560
+208% +$2.57M ﹤0.01% 4342
2022
Q4 		$1.11M Buy
55,678
+36,348
+188% +$1.81M ﹤0.01% 6616
2022
Q3 		$951K Buy
19,330
+431
+2% +$20.3K ﹤0.01% 7099
2022
Q2 		$958K Buy
18,899
+7,519
+66% +$333K ﹤0.01% 7114
2022
Q1 		$474K Buy
11,380
+205
+2% +$10.7K ﹤0.01% 9518
2021
Q4 		$976K Sell
11,175
-987
-8% -$96.7K ﹤0.01% 8024
2021
Q3 		$1.47M Sell
12,162
-342
-3% -$46.7K ﹤0.01% 7121
2021
Q2 		$2.43M Sell
12,504
-1,641
-12% -$540K ﹤0.01% 6118
2021
Q1 		$5.75M Buy
+14,145
New +$6.31M ﹤0.01% 3971

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 $6.73T AUM 46.02% 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 $3.37T AUM 44.26% 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 $881M AUM 160.77% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.68T 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

Ken Griffin's IRON Position: Q1 2026 in Review

Ken Griffin reduced its Disc Medicine (IRON) stake by 2.5% in Q1 2026, selling an estimated $171K and leaving 97,930 shares worth $6.26M. The position accounts for ﹤0.01% of the portfolio, ranked #3982.

Ken Griffin first reported a position in IRON in Q1 2021 and has held it in 20 quarters since. The position peaked at $37.5M in Q4 2024. 203 funds tracked by Wall St. Rank hold IRON as of Q1 2026.

  • Ken Griffin held 97,930 shares of Disc Medicine worth $6.26M as of Q1 2026.
  • Ken Griffin sold 2,465 Disc Medicine shares in Q1 2026, an estimated $171K.
  • Disc Medicine made up ﹤0.01% of Ken Griffin's portfolio in Q1 2026, its #3982 holding.
  • Ken Griffin first reported a position in Disc Medicine in Q1 2021 and has held it in 20 quarters since.
  • Ken Griffin's Disc Medicine position peaked at $37.5M in Q4 2024.
  • 203 funds tracked by Wall St. Rank held Disc Medicine as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.