Janus Henderson Group
IRON icon

Janus Henderson Group’s Disc Medicine IRON Stock Holding History

Janus Henderson Group’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 		$739K Hold
11,555
– – ﹤0.01% 1826
2025
Q4 		$918K Sell
11,555
-350,149
-97% -$29.6M ﹤0.01% 1719
2025
Q3 		$23.9M Sell
361,704
-1,192,257
-77% -$70.9M 0.01% 569
2025
Q2 		$82.3M Buy
1,553,961
+130,702
+9% +$6.14M 0.04% 300
2025
Q1 		$74.5M Buy
1,423,259
+205,444
+17% +$11.4M 0.04% 302
2024
Q4 		$77.2M Buy
1,217,815
+467,988
+62% +$27.1M 0.04% 306
2024
Q3 		$36.8M Buy
749,827
+303,954
+68% +$14.3M 0.02% 451
2024
Q2 		$20.1M Sell
445,873
-75,900
-15% -$2.58M 0.01% 568
2024
Q1 		$32.5M Buy
521,773
+78,595
+18% +$5.1M 0.02% 468
2023
Q4 		$25.6M Sell
443,178
-57,202
-11% -$2.93M 0.02% 495
2023
Q3 		$23.5M Buy
500,380
+1
+0% +$50 0.02% 506
2023
Q2 		$22.2M Buy
500,379
+456,681
+1,045% +$16.2M 0.01% 542
2023
Q1 		$926K Sell
43,698
-456,632
-91% -$10.2M ﹤0.01% 1675
2022
Q4 		$982K Buy
+500,330
New +$24.9M ﹤0.01% 1368

Other funds holding IRON

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
RCM
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 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 $580B AUM 38.23% 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 $999B AUM 46.22% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $881M AUM 160.77% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
FLSM
Frazier Life Sciences Management Palo Alto, California $4.59B AUM 237.58% 1-Year Est. Return
TCM
TCG Crossover Management Palo Alto, California $4.16B AUM 983.43% 1-Year Est. Return

Janus Henderson Group's IRON Position: Q1 2026 in Review

Janus Henderson Group held its Disc Medicine (IRON) position steady in Q1 2026 at 11,555 shares worth $739K. The position accounts for ﹤0.01% of the portfolio, ranked #1826.

Janus Henderson Group first reported a position in IRON in Q4 2022 and has held it in 14 quarters since. The position peaked at $82.3M in Q2 2025. 203 funds tracked by Wall St. Rank hold IRON as of Q1 2026.

  • Janus Henderson Group held 11,555 shares of Disc Medicine worth $739K as of Q1 2026.
  • Janus Henderson Group left its Disc Medicine share count unchanged in Q1 2026.
  • Disc Medicine made up ﹤0.01% of Janus Henderson Group's portfolio in Q1 2026, its #1826 holding.
  • Janus Henderson Group first reported a position in Disc Medicine in Q4 2022 and has held it in 14 quarters since.
  • Janus Henderson Group's Disc Medicine position peaked at $82.3M in Q2 2025.
  • 203 funds tracked by Wall St. Rank held Disc Medicine as of Q1 2026.

Based on Janus Henderson Group's 13F filing for Q1 2026, filed 15 May 2026.