Deerfield Mgmt L.P.
CIK 1010823 · last filed 2024-10-24
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$175.33M
Companies
32
Total Filings
54
Lifetime Open-Market Net
-$1.01B
Filer Profile
Reported Address
780 THIRD AVENUE37TH FLOOR
NEW YORK, NY 10017
Phone
(212) 551-1600
Formerly Known As
DEERFIELD CAPITAL LP (2005–2012)
DEERFIELD CAPITAL LP ET AL (1996–2005)
Related Filers
James E Flynn — 382 joint filings, latest 2026-07-17
DEERFIELD MANAGEMENT COMPANY, L.P. — 379 joint filings, latest 2026-07-17
Deerfield Special Situations Fund, L.P. — 278 joint filings, latest 2021-07-13
DEERFIELD PARTNERS, L.P. — 199 joint filings, latest 2026-07-17
Deerfield Special Situations Fund International LTD — 142 joint filings, latest 2013-07-18
Deerfield Mgmt III, L.P. — 66 joint filings, latest 2026-03-02
Deerfield Private Design Fund III, L.P. — 66 joint filings, latest 2026-03-02
DEERFIELD INTERNATIONAL LTD — 60 joint filings, latest 2011-06-07
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses.
View filings on SEC EDGAR.
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| Nuvalent, Inc. (NUVL) Delisted | Director | 650,000 | $123.96 | $80.57M | -$1.39B | 2 | 2024-10-24 |
| Oncorus, Inc. (ONCR) Delisted | 10%+ Owner | 1,351,374 | $0.12 | $162.9K | -$301.0K | 1 | 2022-12-21 |
| XLO | 10%+ Owner | 81,712 | $8.93 | $729.7K | $62.00M | 1 | 2021-10-28 |
| DA32 Life Science Tech Acquisition Corp. (DALS) Delisted | Director | 1,600,000 | $10.32 | $16.51M | $64.00M | 1 | 2021-08-03 |
| CareMax, Inc. (CMAXW) Delisted | Director | 3,768,750 | $0.01 | $36.2K | $0 | 1 | 2021-06-10 |
| Terns Pharmaceuticals, Inc. (TERN) Delisted | 10%+ Owner | 2,382,033 | $52.95 | $126.13M | $45.22M | 1 | 2021-02-09 |
| ANNX | 10%+ Owner | 808,914 | $3.94 | $3.19M | $71.40M | 1 | 2020-07-28 |
| CareMax, Inc. (DFHTU) Delisted | Director | 3,360,000 | $15.65 | $52.58M | $0 | 1 | 2020-07-22 |
| SDGR | 10%+ Owner | 250,000 | $19.02 | $4.75M | $25.50M | 1 | 2020-02-10 |
| XERS | 10%+ Owner | 857,821 | $7.45 | $6.39M | -$655.5K | 1 | 2019-02-12 |
| CONSTELLATION PHARMACEUTICALS INC (CNST) Delisted | 10%+ Owner | 835,843 | $33.99 | $28.41M | $12.00M | 1 | 2018-07-23 |
| Keenova Therapeutics plc (MNK) Delisted | 10%+ Owner | 8,308,455 | $0.34 | $2.83M | -$16.76M | 1 | 2018-05-10 |
| EHTH | 10%+ Owner | 428,367 | $0.93 | $399.3K | $27.88M | 5 | 2017-04-27 |
| CAS MEDICAL SYSTEMS INC (CASM) Delisted | 10%+ Owner | 3,128,087 | — | — | -$1.25M | 1 | 2017-01-23 |
| Larimar Therapeutics, Inc. (ZFGN) Delisted | 10%+ Owner | 95,984 | — | — | -$26.66M | 1 | 2016-08-01 |
| BOLD | 10%+ Owner | 889,230 | $2.83 | $2.52M | $36.00M | 1 | 2016-07-25 |
| XENOPORT INC (XNPT) Delisted | 10%+ Owner | 6,667,391 | — | — | $5.67M | 1 | 2016-01-22 |
| VNDA | 10%+ Owner | 2,152,952 | $5.09 | $10.96M | $600.9K | 1 | 2015-12-18 |
| ALIMERA SCIENCES INC (ALIM) Delisted | 10%+ Owner | 300,177 | $5.54 | $1.66M | $3.20M | 2 | 2015-11-10 |
| ANTARES PHARMA, INC. (ATRS) Delisted | 10%+ Owner | 6,807,533 | $5.59 | $38.05M | -$19.69M | 1 | 2015-09-30 |
| AXGN | 10%+ Owner | 3,381,439 | $42.16 | $142.56M | -$7.59M | 1 | 2015-09-22 |
| SteadyMed Ltd. (STDY) Delisted | 10%+ Owner | 823,529 | — | — | $37.62M | 1 | 2015-03-25 |
| PRTO | 10%+ Owner | 3,931 | $27.78 | $109.2K | $48.42M | 1 | 2014-10-27 |
| Dicerna Pharmaceuticals Inc (DRNA) Delisted | 10%+ Owner | 825,603 | $38.22 | $31.55M | -$8.96M | 1 | 2014-10-15 |
| RIGL | 10%+ Owner | 78,770 | $47.24 | $3.72M | $36.40M | 1 | 2011-06-07 |
| NeuroMetrix, Inc. (NURO) Delisted | 10%+ Owner | 6 | $4.58 | $27 | -$2.98M | 3 | 2010-11-18 |
| MEDICINES CO /DE (MDCO) Delisted | 10%+ Owner | 2,416,432 | — | — | $45.35M | 2 | 2010-09-13 |
| SALIX PHARMACEUTICALS LTD (SLXP) Delisted | 10%+ Owner | 2,011,714 | — | — | -$50.33M | 3 | 2009-09-10 |
| NITROMED INC (NTMD) Delisted | 10%+ Owner | 1,936,622 | — | — | $1.50M | 3 | 2008-07-30 |
| DYNAVAX TECHNOLOGIES CORP (DVAX) Delisted | 10%+ Owner | — | $15.50 | — | $0 | 1 | 2007-11-01 |
| VIA Pharmaceuticals, Inc. (VIAP) Delisted | 10%+ Owner | 1,286,209 | — | — | -$315.4K | 1 | 2007-10-26 |
| THIRD WAVE TECHNOLOGIES INC /WI (TWTI) Delisted | 10%+ Owner | 1,308,529 | — | — | -$8.93M | 1 | 2007-05-22 |
Recent Filings · Page 5 of 6
54 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2010-09-13 | MEDICINES CO /DE (MDCO) Delisted | Buy (P) | +440,245 | $5.76M | EDGAR |
| 2010-08-18 | — | Sell (S) | −1,000,000 | -$690.0K | |
| 2010-08-09 | MEDICINES CO /DE (MDCO) Delisted | Mixed | +3,284,565 | $39.58M | EDGAR |
| 2009-09-10 | SALIX PHARMACEUTICALS LTD (SLXP) Delisted | Sell (S) | −5,129,765 | -$67.16M | EDGAR |
| 2009-07-15 | — | Sell (S) | −1,250,760 | -$7.47M | |
| 2009-07-08 | — | Sell (S) | −272,250 | -$1.62M | |
| 2008-12-22 | SALIX PHARMACEUTICALS LTD (SLXP) Delisted | Buy (P) | +2,075,470 | $16.83M | EDGAR |
| 2008-10-21 | SALIX PHARMACEUTICALS LTD (SLXP) Delisted | Mixed | — | $0 | EDGAR |
| 2008-07-30 | NITROMED INC (NTMD) Delisted | Buy (P) | +255,600 | $255.6K | EDGAR |
| 2008-07-22 | NITROMED INC (NTMD) Delisted | Buy (P) | +513,680 | $521.0K | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.