FS Development Corp

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FS Development Corp
TickerIRON
CIK #0001816736
CUSIP254604101
SectorLife Sciences - Pharmaceutical Preparations
Addressc/o Foresite Capital, 600 Montgomery St Suite 4500, San Francisco, CA 94111
Source [EDGAR]
CIK Filing 2011 - 2026
[0001816736] 10-K
[0001816736] 10-Q
[0001816736] 3
[0001816736] 4
[0001816736] 8-K
[0001816736] SC 13D
[0001816736] SC 13G
Form 13D/13G Filer Form 13D/13G Subject Filed % Owned
RA Capital Management LP Disc Medicine Inc [2026-01-07] 0.0
Wellington Management Group LLP Disc Medicine Inc [2025-05-12] 0.0
FMR LLC Disc Medicine Inc [2025-02-12] 0.0
Wellington Management Group LLP Disc Medicine Inc [2024-11-08] 6.19
BlackRock Inc Disc Medicine Inc [2024-11-08] 6.2
BlackRock Inc Disc Medicine Inc [2024-10-24] 6.2
Frazier Life Sciences Public Fund LP Disc Medicine Inc [2024-06-25] 8194.0
Paradigm Biocapital Advisors LP Disc Medicine Inc [2023-09-25] 5.4
Adage Capital Partners GP LLC Disc Medicine Inc [2023-06-30] 5.24
Bain Capital Life Sciences Opportunities III LP Disc Medicine Inc [2023-02-24] 0.99
FMR LLC Disc Medicine Inc [2023-02-10] 0.0
AI DMI LLC Disc Medicine Inc [2023-01-09] 16.0
BML Investment Partners LP Disc Medicine Inc [2023-01-09] 2.95
Novo Holdings A/S Disc Medicine Inc [2023-01-03] 13.8
Adage Capital Partners GP LLC Gemini Therapeutics Inc /DE [2022-10-11] 5.78
BML Investment Partners LP Gemini Therapeutics Inc /DE [2022-03-10] 5.3
BML Investment Partners LP Gemini Therapeutics Inc /DE [2022-03-10] 5.3
Franklin Resources Inc Gemini Therapeutics Inc /DE [2022-02-03] 5.8
Suvretta Capital Management LLC Gemini Therapeutics Inc /DE [2021-10-15] 5.2
OrbiMed Advisors LLC Gemini Therapeutics Inc /DE [2021-02-22] 12.9
Alyeska Investment Group LP Gemini Therapeutics Inc /DE [2021-02-16] 6.8
Lightstone Ventures LP Gemini Therapeutics Inc /DE [2021-02-16] 11.0
Atlas Venture Fund X LP Gemini Therapeutics Inc /DE [2021-02-16] 8.9
FS Development Holdings LLC Gemini Therapeutics Inc /DE [2021-02-12] 10.75
Wellington Management Group LLP FS Development Corp [2021-02-04] 7.91
Opaleye Management Inc FS Development Corp [2021-01-08] 11.0
Hawkes Bay Master Investors Cayman LP FS Development Corp [2020-11-02] 5.03
Suvretta Capital Management LLC FS Development Corp [2020-10-26] 7.2
Adage Capital Partners GP LLC FS Development Corp [2020-08-24] 7.99
Form 3/4/5 Filer 2011 - 2026
Khara Rahul
Disc Medicine Inc
Yu Jonathan Yen-Wen
Ratcliffe Liam
Ahmed Nadim
Bitterman Kevin
Chin Mark
Gemayel Georges
Nicholson Donald William
Quisel John D
White William Richard
Savage William Jacob
Franchi Jean M
Stephenson Pamela
Access Industries Management LLC
Blavatnik Len
Access Industries Holdings LLC
AI DMI LLC
Ashiya Mona
OrbiMed Genesis GP LLC
OrbiMed Capital GP VIII LLC
OrbiMed Capital GP VI LLC
OrbiMed Advisors LLC
Bryce Joanne
Atlas Venture Fund X LP
Atlas Venture Opportunity Fund II LP
Atlas Venture Associates Opportunity II LP
Atlas Venture Associates Opportunity II LLC
Atlas Venture Associates X LLC
Atlas Venture Associates X LP
Atlas Venture Opportunity Fund I LP
Atlas Venture Associates Opportunity I LLC
Atlas Venture Associates Opportunity I LP
MacDonald Brian Richard
Novo Holdings A/S
Backstrom Jay T
Leonard Braden Michael
Piekos Brian
Meyenburg Jason Patrick
Gordon Carl L
Lubner David Charles
Ong Tuyen
Rhodes Jason P
Tananbaum James B
Strapps Walter
Barone Samuel B
Uknis Marc
Redmond Precillia
Lauder Scott
George Jean
Lightstone Ventures A LP
Lightstone Singapore LP
Lightstone Ventures LP
Plain Henry A JR
Lightstone Singapore Associates LLC
LSV Associates LLC
Carusi Michael A
Atlas Venture Associates XII LP
Atlas Venture Fund XII LP
Atlas Venture Associates XII LLC
Beloff Gregg
Foresite Capital Fund V LP
Foresite Capital Management V LLC
FS Development Holdings LLC
Foresite Capital Opportunity Management V LLC
Foresite Capital Opportunity Fund V LP
Bajaj Vikram
Rome Michael E
Ryan Dennis D
Pakianathan Deepika
Dubin Daniel
Carey Robert
Insider Transaction (Form 3/4/5) Date Action Shares Price Value ($)
Savage William Jacob
Common Stock
2026-03-02 Sell 2,986 $66.41 198,300
Savage William Jacob
Common Stock
2026-03-02 Sell 4,392 $65.52 287,764
Franchi Jean M
Common Stock
2026-02-25 Sell 353 $69.06 24,378
Franchi Jean M
Common Stock
2026-02-18 Sell 3,397 $65.01 220,839
Franchi Jean M
Common Stock
2026-02-18 Sell 3,684 $65.89 242,739
Quisel John D
Common Stock
2026-02-17 Sell 13,264 $62.86 833,775
Franchi Jean M
Common Stock
2026-02-17 Sell 4,075 $62.86 256,154
Yu Jonathan Yen-Wen
Common Stock
2026-02-17 Sell 3,231 $62.86 203,101
Khara Rahul
Common Stock
2026-02-17 Sell 2,853 $62.86 179,340
Stephenson Pamela
Common Stock
2026-02-17 Sell 5,531 $62.86 347,679
Savage William Jacob
Common Stock
2026-02-17 Sell 3,256 $62.86 204,672
Quisel John D
Stock Option (Right to Buy) · derivative
2026-02-10 Grant 82,800 $0.00
Khara Rahul
Stock Option (Right to Buy) · derivative
2026-02-10 Grant 25,500 $0.00
Savage William Jacob
Stock Option (Right to Buy) · derivative
2026-02-10 Grant 25,500 $0.00
Quisel John D
Common Stock
2026-02-10 Grant 55,200 $0.00
Franchi Jean M
Stock Option (Right to Buy) · derivative
2026-02-10 Grant 25,500 $0.00
Yu Jonathan Yen-Wen
Common Stock
2026-02-10 Grant 17,000 $0.00
Stephenson Pamela
Stock Option (Right to Buy) · derivative
2026-02-10 Grant 25,500 $0.00
Savage William Jacob
Common Stock
2026-02-10 Grant 17,000 $0.00
Stephenson Pamela
Common Stock
2026-02-10 Grant 17,000 $0.00
showing 20 of 200 most recent transactions
13F Ownership Over TimeHoldersShares Held
2026-03-31 206 40,730,922
2025-12-31 200 36,690,836
2025-09-30 171 33,665,746
2025-06-30 154 33,022,476
2025-03-31 161 31,844,464
2024-12-31 155 25,264,827
2024-09-30 134 26,288,498
2024-06-30 124 27,600,834
2024-03-31 137 23,040,024
2023-12-31 113 20,054,485
2023-09-30 94 19,510,430
2023-06-30 92 61,575,686
Form 13F Holdings
Firm Period DFND Voting Shares
Assenagon Asset Management SA [2026-06-30] SOLE 384,158 384,158
Y-Intercept Hong Kong Ltd [2026-06-30] SOLE 26,888 26,888
Handelsbanken Fonder AB [2026-06-30] SOLE 0 12,700
PSP Research LLC [2026-06-30] SOLE 0 8,000
Eleva Capital SAS [2026-06-30] SOLE 0 5,115
Gamma Investing LLC [2026-06-30] DFND 292 292
Corecap Advisors LLC [2026-06-30] SOLE 0 78
Farther Finance Advisors LLC [2026-06-30] SOLE 0 47
First Horizon Corp [2026-06-30] DFND 0 36
Versant Capital Management Inc [2026-06-30] SOLE 30 30
Hughes Financial Services LLC [2026-06-30] SOLE 2 2
IFP Advisors LLC [2026-06-30] SOLE 1 1
Fortitude Family Office LLC [2026-06-30] SOLE 1 1
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