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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 $52.4M across reported positions.

"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

$52.41M

Companies

14

Total Filings

19

Lifetime Open-Market Net

$424.90M

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
LRMR Director 9,538,945 $3.83 $36.53M $300.00M 1 2025-08-04
HOWL 10%+ Owner 1,752,787 $0.45 $787.5K $51.20M 1 2021-05-04
NKTX 10%+ Owner 709,936 $2.22 $1.58M $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 $5.33 $7.52M $0 2 2019-01-02
CBIO 10%+ Owner 20,568 $16.44 $338.1K -$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 $5.16 $4.39M -$111.36M 1 2016-09-26
EHTH 10%+ Owner 923,448 $1.36 $1.26M -$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
Insider 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
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
Showing 1–10 of 19
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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.