Deerfield Mgmt L.P. (CIK 0001010823)

Latest company ownership

AHCO - AdaptHealth Corp.
Role: 10% Owner
Shares held
13,607,940
Last filed at
Mar 8, 2024
Confidence Score
50.0
2025Q4
Confidence Score History
2024Q1 2025Q4
Shares held
7,772,954
Last filed at
Nov 16, 2021
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q1 2025Q4
Shares held
6,100,000
Last filed at
Nov 5, 2010
Confidence Score
50.0
2025Q4
Confidence Score History
2010Q4 2025Q4
Shares held
4,721,197
Last filed at
Feb 16, 2024
Confidence Score
59.4
2025Q4
Confidence Score History
2016Q1 2025Q4
QTTB - Q32 Bio Inc.
Role: 10% Owner
Shares held
4,087,305
Last filed at
Jan 31, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2018Q2 2025Q4
Shares held
3,788,540
Last filed at
May 4, 2018
Confidence Score
50.0
2025Q4
Confidence Score History
2018Q2 2025Q4
Shares held
3,159,165
Last filed at
Jul 1, 2019
Confidence Score
50.0
2025Q4
Confidence Score History
2019Q2 2025Q4
AXGN - Axogen, Inc.
Role: 10% Owner
Shares held
3,000,000
Last filed at
Jul 21, 2016
Confidence Score
50.0
2025Q4
Confidence Score History
2015Q2 2025Q4
Shares held
1,752,787
Last filed at
May 4, 2021
Confidence Score
50.0
2025Q4
Confidence Score History
2021Q2 2025Q4
Shares held
1,717,033
Last filed at
Feb 9, 2021
Confidence Score
50.0
2025Q4
Confidence Score History
2021Q1 2025Q4
Shares held
1,558,456
Last filed at
Jul 24, 2019
Confidence Score
50.0
2025Q4
Confidence Score History
2019Q3 2025Q4
SDGR - Schrodinger, Inc.
Role: 10% Owner
Shares held
1,346,167
Last filed at
Feb 10, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q1 2025Q4
Shares held
1,027,475
Last filed at
Dec 4, 2017
Confidence Score
50.0
2025Q4
Confidence Score History
2014Q4 2025Q4
EHTH - eHealth, Inc.
Role: 10% Owner
Shares held
877,606
Last filed at
Apr 27, 2017
Confidence Score
50.0
2025Q4
Confidence Score History
2014Q3 2025Q4
Shares held
862,587
Last filed at
Sep 17, 2024
Confidence Score
50.0
2025Q4
Confidence Score History
2024Q3 2025Q4
Shares held
756,472
Last filed at
Oct 28, 2021
Confidence Score
50.0
2025Q4
Confidence Score History
2021Q4 2025Q4
NKTX - Nkarta, Inc.
Role: 10% Owner
Shares held
709,936
Last filed at
Jul 14, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q3 2025Q4
Shares held
693,171
Last filed at
Sep 26, 2016
Confidence Score
50.0
2025Q4
Confidence Score History
2014Q4 2025Q4
NUVL - Nuvalent, Inc.
Role: Director
Shares held
650,000
Last filed at
Nov 24, 2025
Confidence Score
23.6
2025Q4
Confidence Score History
2022Q4 2025Q4
Shares held
531,208
Last filed at
Aug 5, 2014
Confidence Score
50.0
2025Q4
Confidence Score History
2014Q3 2025Q4
Shares held
498,795
Last filed at
Feb 18, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q1 2025Q4
KRRO - Korro Bio, Inc.
Role: 10% Owner
Shares held
472,860
Last filed at
Oct 7, 2019
Confidence Score
50.0
2025Q4
Confidence Score History
2019Q4 2025Q4
CABA - Cabaletta Bio, Inc.
Role: 10% Owner
Shares held
464,253
Last filed at
Oct 30, 2019
Confidence Score
50.0
2025Q4
Confidence Score History
2019Q4 2025Q4
ANNX - Annexon, Inc.
Role: 10% Owner
Shares held
458,914
Last filed at
Jul 28, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q3 2025Q4
RGNX - REGENXBIO Inc.
Role: 10% Owner
Shares held
397,079
Last filed at
Sep 22, 2015
Confidence Score
50.0
2025Q4
Confidence Score History
2015Q3 2025Q4
Shares held
383,538
Last filed at
May 31, 2018
Confidence Score
50.0
2025Q4
Confidence Score History
2018Q2 2025Q4
Shares held
378,790
Last filed at
Feb 3, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q1 2025Q4
ARVN - ARVINAS, INC.
Role: 10% Owner
Shares held
307,078
Last filed at
Oct 1, 2018
Confidence Score
50.0
2025Q4
Confidence Score History
2018Q4 2025Q4
Shares held
305,965
Last filed at
Mar 21, 2018
Confidence Score
50.0
2025Q4
Confidence Score History
2018Q1 2025Q4
CALC - CalciMedica, Inc.
Role: 10% Owner
Shares held
291,467
Last filed at
Oct 1, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q3 2025Q4
Shares held
291,005
Last filed at
Oct 10, 2017
Confidence Score
50.0
2025Q4
Confidence Score History
2017Q4 2025Q4
PEPG - PepGen Inc.
Role: 10% Owner
Shares held
268,480
Last filed at
May 10, 2022
Confidence Score
50.0
2025Q4
Confidence Score History
2022Q2 2025Q4
GBIO - Generation Bio Co.
Role: 10% Owner
Shares held
257,883
Last filed at
Jun 16, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q2 2025Q4
ATYR - aTYR PHARMA INC
Role: 10% Owner
Shares held
230,764
Last filed at
May 13, 2015
Confidence Score
50.0
2025Q4
Confidence Score History
2015Q2 2025Q4
Shares held
160,512
Last filed at
Oct 14, 2015
Confidence Score
50.0
2025Q4
Confidence Score History
2015Q4 2025Q4

Recent buy/sell transactions

Exec date Filing date Company Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Nov 24, 2025 Nov 24, 2025 Nuvalent, Inc. Director Sell 15.0 -742,574 -4.13% ✗ $70.9M
Jul 31, 2025 Aug 4, 2025 Larimar Therapeutics, Inc. Director Buy 100.0 +9,375,000 44.16% ✗ $30M
Oct 22, 2024 Oct 24, 2024 Nuvalent, Inc. Director Sell 15.0 -2,000,000 -10.00% ✗ $195.5M
Sep 17, 2024 Sep 17, 2024 Bicara Therapeutics Inc. 10% Owner Buy 92.5 +70,000 4.06% ✗ $1.3M
Mar 8, 2024 Mar 12, 2024 AdaptHealth Corp. 10% Owner Sell 17.5 -350,000 -2.57% ✗ $3.8M
Feb 16, 2024 Feb 16, 2024 Larimar Therapeutics, Inc. Director Buy 100.0 +4,290,617 25.33% ✗ $37.5M
Nov 3, 2022 Nov 7, 2022 Nuvalent, Inc. Director Buy 95.0 +650,000 3.36% ✗ $21.8M
May 10, 2022 May 10, 2022 PepGen Inc. 10% Owner Buy 100.0 +416,666 77.60% ✗ $5M
Oct 26, 2021 Oct 28, 2021 Xilio Therapeutics, Inc. 10% Owner Buy 100.0 +775,000 51.22% ✗ $12.4M
Jul 9, 2021 Jul 13, 2021 Mirum Pharmaceuticals, Inc. 10% Owner Sell 17.5 -99,325 -2.94% ✗ $1.6M
Jul 2, 2021 Jul 7, 2021 Mirum Pharmaceuticals, Inc. 10% Owner Sell 17.5 -66,675 -1.93% ✗ $1.1M
May 4, 2021 May 4, 2021 Werewolf Therapeutics, Inc. 10% Owner Buy 100.0 +800,000 45.64% ✗ $12.8M
Feb 9, 2021 Feb 9, 2021 Terns Pharmaceuticals, Inc. 10% Owner Buy 100.0 +665,000 38.73% ✗ $11.3M
Sep 29, 2020 Oct 1, 2020 CalciMedica, Inc. 10% Owner Buy 100.0 +1,562,500 536.08% ✗ $25M
Jul 28, 2020 Jul 28, 2020 Annexon, Inc. 10% Owner Buy 100.0 +700,000 76.27% ✗ $11.9M
Jul 14, 2020 Jul 14, 2020 Nkarta, Inc. 10% Owner Buy 100.0 +1,000,000 70.43% ✗ $18M
Jun 16, 2020 Jun 16, 2020 Generation Bio Co. 10% Owner Buy 100.0 +225,000 23.41% ✗ $4.3M
Mar 13, 2020 Mar 17, 2020 Oncology Institute, Inc. Director Buy 100.0 +5,000,000 100.00% ✗ $50M
Feb 18, 2020 Feb 18, 2020 Revolution Medicines, Inc. 10% Owner Buy 100.0 +600,000 40.10% ✗ $10.2M
Feb 10, 2020 Feb 10, 2020 Schrodinger, Inc. 10% Owner Buy 100.0 +250,000 100.00% ✗ $4.3M
Feb 3, 2020 Feb 3, 2020 Black Diamond Therapeutics, Inc. 10% Owner Buy 100.0 +400,000 105.60% ✗ $7.6M
Jan 29, 2020 Jan 31, 2020 Q32 Bio Inc. 10% Owner Sell 16.3 -518,827 -11.26% ✗ $8M
Jan 24, 2020 Jan 28, 2020 Q32 Bio Inc. 10% Owner Sell 15.0 -639,506 -12.19% ✗ $10M
Dec 24, 2019 Dec 27, 2019 Q32 Bio Inc. 10% Owner Sell 16.3 -350,000 -6.25% ✗ $7.7M
Dec 19, 2019 Dec 23, 2019 Q32 Bio Inc. 10% Owner Sell 17.5 -164,730 -2.86% ✗ $3.6M
Oct 29, 2019 Oct 30, 2019 Cabaletta Bio, Inc. 10% Owner Buy 100.0 +700,000 100.00% ✗ $7.7M
Oct 7, 2019 Oct 7, 2019 Korro Bio, Inc. 10% Owner Buy 100.0 +285,714 100.00% ✗ $4M
Jul 22, 2019 Jul 24, 2019 Mirum Pharmaceuticals, Inc. 10% Owner Buy 100.0 +332,000 21.30% ✗ $5M
Jun 27, 2019 Jul 1, 2019 Aclaris Therapeutics, Inc. 10% Owner Sell 17.5 -699,475 -14.50% ✗ $1.9M
Jun 26, 2019 Jun 26, 2019 Aclaris Therapeutics, Inc. 10% Owner Sell 52.5 -1,704 -0.04% ✗ $7.7K
Jun 21, 2019 Jun 25, 2019 Aclaris Therapeutics, Inc. 10% Owner Sell 17.5 -454,261 -8.61% ✗ $2.1M
May 9, 2019 May 13, 2019 Aclaris Therapeutics, Inc. 10% Owner Sell 17.5 -614,710 -10.43% ✗ $3.8M
Apr 12, 2019 Apr 15, 2019 Q32 Bio Inc. Director Buy 100.0 +533,333 10.20% ✗ $12M
Oct 1, 2018 Oct 1, 2018 ARVINAS, INC. 10% Owner Buy 100.0 +312,500 33.92% ✗ $5M
Jun 25, 2018 Jun 25, 2018 AVADEL PHARMACEUTICALS PLC 10% Owner Sell 20.0 -114,034 -3.01% ✗ $683.3K
May 29, 2018 May 31, 2018 Kiniksa Pharmaceuticals International, plc 10% Owner Buy 100.0 +843,352 100.00% ✗ $16M
Apr 2, 2018 Apr 4, 2018 Q32 Bio Inc. Director Buy 100.0 +1,250,000 62.86% ✗ $20M
Mar 6, 2018 Mar 21, 2018 GYRE THERAPEUTICS, INC. 10% Owner Sell 17.5 -71,778 -6.06% ✗ $2.2M
Mar 6, 2018 Mar 8, 2018 GYRE THERAPEUTICS, INC. 10% Owner Sell 17.5 -71,778 -6.06% ✗ $2.2M
Oct 10, 2017 Oct 10, 2017 RHYTHM PHARMACEUTICALS, INC. 10% Owner Buy 100.0 +355,000 61.00% ✗ $6M
Apr 26, 2017 Apr 27, 2017 eHealth, Inc. 10% Owner Sell 17.5 -426,954 -18.90% ✗ $5M
Apr 13, 2017 Apr 17, 2017 eHealth, Inc. 10% Owner Sell 17.5 -150,000 -6.23% ✗ $1.7M
Apr 7, 2017 Apr 11, 2017 eHealth, Inc. 10% Owner Sell 17.5 -232,101 -8.79% ✗ $2.6M
Sep 22, 2016 Sep 26, 2016 Vanda Pharmaceuticals Inc. 10% Owner Sell 15.0 -1,120,461 -20.56% ✗ $18.6M
Sep 15, 2016 Sep 19, 2016 Vanda Pharmaceuticals Inc. 10% Owner Sell 16.3 -547,886 -9.14% ✗ $8.6M
Jul 20, 2016 Aug 1, 2016 Larimar Therapeutics, Inc. 10% Owner Sell 17.5 -1,341,499 -43.90% ✗ $4.4M
Jul 21, 2016 Jul 21, 2016 Axogen, Inc. 10% Owner Sell 20.0 -102,136 -3.29% ✗ $684.3K
Jul 14, 2016 Jul 18, 2016 Axogen, Inc. 10% Owner Sell 17.5 -279,303 -8.26% ✗ $2.1M
Jun 20, 2016 Jun 22, 2016 eHealth, Inc. 10% Owner Sell 17.5 -204,854 -7.20% ✗ $2.9M
Jun 14, 2016 Jun 16, 2016 eHealth, Inc. 10% Owner Sell 20.0 -43,300 -1.50% ✗ $601.2K
Jun 6, 2016 Jun 8, 2016 eHealth, Inc. 10% Owner Sell 20.0 -63,736 -2.16% ✗ $887K
May 31, 2016 Jun 2, 2016 eHealth, Inc. 10% Owner Sell 17.5 -99,508 -3.26% ✗ $1.4M
May 25, 2016 May 27, 2016 eHealth, Inc. 10% Owner Sell 17.5 -212,581 -6.51% ✗ $3M
Feb 12, 2016 Feb 17, 2016 Larimar Therapeutics, Inc. 10% Owner Buy 85.0 +64,545 2.16% ✗ $403.2K
Feb 9, 2016 Feb 11, 2016 Larimar Therapeutics, Inc. 10% Owner Buy 95.0 +267,493 9.82% ✗ $1.6M
Dec 16, 2015 Dec 18, 2015 Vanda Pharmaceuticals Inc. 10% Owner Buy 60.0 +11,170 0.19% ✗ $100.2K
Dec 10, 2015 Dec 18, 2015 Vanda Pharmaceuticals Inc. 10% Owner Buy 95.0 +425,982 7.66% ✗ $3.7M
Dec 9, 2015 Dec 11, 2015 Vanda Pharmaceuticals Inc. 10% Owner Buy 100.0 +1,201,364 17.56% ✗ $10.1M
Oct 14, 2015 Oct 14, 2015 CytomX Therapeutics, Inc. 10% Owner Buy 100.0 +625,000 194.69% ✗ $7.5M
Sep 18, 2015 Sep 22, 2015 Axogen, Inc. 10% Owner Sell 17.5 -345,000 -9.26% ✗ $1.9M
Sep 22, 2015 Sep 22, 2015 REGENXBIO Inc. 10% Owner Buy 100.0 +175,000 14.97% ✗ $3.9M
May 12, 2015 May 13, 2015 aTYR PHARMA INC 10% Owner Buy 97.5 +50,000 10.83% ✗ $700K
Apr 8, 2015 Apr 9, 2015 Axogen, Inc. 10% Owner Sell 20.0 -144,385 -3.73% ✗ $469.3K
Mar 6, 2015 Mar 9, 2015 eHealth, Inc. 10% Owner Buy 75.0 +30,103 0.78% ✗ $286.6K
Jan 14, 2015 Jan 16, 2015 eHealth, Inc. 10% Owner Buy 100.0 +1,000,000 44.16% ✗ $20.3M
Dec 23, 2014 Dec 24, 2014 Vanda Pharmaceuticals Inc. 10% Owner Buy 92.5 +162,014 4.07% ✗ $2.3M
Oct 27, 2014 Oct 27, 2014 Protara Therapeutics, Inc. 10% Owner Buy 100.0 +691,713 122.78% ✗ $6.9M
Aug 7, 2014 Aug 11, 2014 eHealth, Inc. 10% Owner Buy 60.0 +3,131 0.14% ✗ $65.9K
Aug 1, 2014 Aug 5, 2014 eHealth, Inc. 10% Owner Buy 100.0 +329,540 17.06% ✗ $6.6M
Aug 5, 2014 Aug 5, 2014 Adverum Biotechnologies, Inc. 10% Owner Buy 100.0 +1,334,467 154.59% ✗ $31.9M
May 26, 2011 Jun 7, 2011 RIGEL PHARMACEUTICALS INC 10% Owner Buy 100.0 +650,000 10.67% ✗ $5.2M
Nov 3, 2010 Nov 5, 2010 RIGEL PHARMACEUTICALS INC 10% Owner Sell 47.5 -7,711 -0.13% ✗ $58.2K