DEERFIELD PARTNERS, L.P.
CIK 1301041 · last filed 2025-08-04
DEERFIELD PARTNERS, L.P. is a corporate insider who has filed 19 SEC Form 4 insider transactions across 14 companies since 2009. The most recent filing shows the insider bought $300.0M of LRMR on Aug 4, 2025. Across all open-market trades the lifetime net is +$424.9M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $54.3M across reported positions. The firm reports its address in New York, NY. 199 SEC filings were submitted jointly with Deerfield Mgmt L.P.
"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.
$54.28M
14
19
$424.90M
Filer Profile
12TH FLOOR
NEW YORK, NY 10010
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| LRMR | Director | 9,538,945 | $3.92 | $37.39M | $300.00M | 1 | 2025-08-04 |
| HOWL | 10%+ Owner | 1,752,787 | $0.98 | $1.72M | $51.20M | 1 | 2021-05-04 |
| NKTX | 10%+ Owner | 709,936 | $2.91 | $2.07M | $108.00M | 1 | 2020-07-14 |
| Generation Bio Co. (GBIO) Delisted | 10%+ Owner | 96,122 | $5.34 | $513.3K | $17.10M | 1 | 2020-06-16 |
| ACRS | 10%+ Owner | 1,411,628 | $5.32 | $7.51M | $0 | 2 | 2019-01-02 |
| CBIO | 10%+ Owner | 20,568 | $19.41 | $399.2K | -$10.96M | 1 | 2018-03-21 |
| Societal CDMO, Inc. (REPH) Delisted | 10%+ Owner | 1,287,132 | $2.09 | $2.69M | -$2.66M | 1 | 2017-06-09 |
| VNDA | 10%+ Owner | 850,778 | $5.09 | $4.33M | -$111.36M | 1 | 2016-09-26 |
| EHTH | 10%+ Owner | 923,448 | $0.93 | $860.7K | -$9.19M | 3 | 2016-06-16 |
| ANTARES PHARMA, INC. (ATRS) Delisted | 10%+ Owner | 8,268,733 | $5.59 | $46.22M | -$8.67M | 1 | 2015-07-08 |
| AUXILIUM PHARMACEUTICALS INC (AUXL) Delisted | 10%+ Owner | — | — | — | $0 | 1 | 2014-10-01 |
| Loxo Oncology, Inc. (LOXO) Delisted | 10%+ Owner | 469,470 | — | — | $99.21M | 1 | 2014-08-06 |
| MEDICINES CO /DE (MDCO) Delisted | 10%+ Owner | 3,475,538 | — | — | $0 | 1 | 2010-10-19 |
| NxStage Medical, Inc. (NXTM) Delisted | 10%+ Owner | 284,213 | — | — | -$7.77M | 2 | 2009-12-10 |
Recent Filings
19 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2025-08-04 | LRMR | Buy (P) | +93,750,000 | $300.00M | EDGAR |
| 2023-08-01 | — | Other (J) | −6,400,000 | $0 | |
| 2021-05-04 | HOWL | Mixed | +10,211,148 | $51.20M | EDGAR |
| 2020-07-14 | NKTX | Mixed | +14,519,232 | $108.00M | EDGAR |
| 2020-06-16 | Generation Bio Co. (GBIO) Delisted | Mixed | +4,744,860 | $17.10M | EDGAR |
| 2019-01-02 | ACRS | Other (J) | — | $0 | EDGAR |
| 2018-12-21 | ACRS | Other (J) | — | $0 | EDGAR |
| 2018-03-21 | CBIO | Sell (S) | −358,890 | -$10.96M | EDGAR |
| 2017-06-09 | Societal CDMO, Inc. (REPH) Delisted | Sell (S) | −377,208 | -$2.66M | EDGAR |
| 2016-09-26 | VNDA | Sell (S) | −6,722,766 | -$111.36M | EDGAR |
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.