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Boxer Asset Management Inc.

CIK 1465836 · last filed 2021-12-21

Boxer Asset Management Inc. is a corporate insider who has filed 7 SEC Form 4 insider transactions across 4 companies since 2016. The most recent filing shows the insider bought $4.9M of TYRA on Dec 21, 2021. Across all open-market trades the lifetime net is +$27.4M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $184.7M across reported positions. The firm reports its address in Lyford Cay, New Providence, C5. 63 SEC filings were submitted jointly with Boxer Capital, LLC.

"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

$184.75M

Companies

4

Total Filings

7

Lifetime Open-Market Net

$27.44M

Filer Profile

Reported Address
CAY HOUSE
EP TAYLOR DRIVE N7776
LYFORD CAY, NEW PROVIDENCE, C5 00000
Phone
(407) 876-2431
Related Filers
Boxer Capital, LLC — 63 joint filings, latest 2024-05-14
JOSEPH LEWIS — 62 joint filings, latest 2024-05-14
MVA Investors, LLC — 38 joint filings, latest 2024-02-08
Aaron I. Davis — 24 joint filings, latest 2024-05-14
Tango Therapeutics, Inc. — 9 joint filings, latest 2024-10-15
Braslyn Ltd. — 7 joint filings, latest 2024-01-25
Shehan Bharatha Dissanayake — 6 joint filings, latest 2024-01-25
Christopher Fuglesang — 6 joint filings, latest 2024-01-25
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
TYRA 10%+ Owner 6,448,359 $28.65 $184.75M $4.92M 1 2021-12-21
Odonate Therapeutics, Inc. (ODT) Delisted 10%+ Owner 4,910,786 $1.12 $5.50M $16.93M 2 2020-09-09
Esperion Therapeutics, Inc. (ESPR) Delisted 10%+ Owner 1,134,750 $3.18 $3.61M -$16.92M 1 2018-11-05
Mirati Therapeutics, Inc. (MRTX) Delisted 10%+ Owner 2,323,495 $58.70 $136.39M $22.50M 3 2018-06-11

Recent Filings

7 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
2021-12-21 TYRA Buy (P) +375,000 $4.92M EDGAR
2020-09-09 Odonate Therapeutics, Inc. (ODT) Delisted Buy (P) +675,000 $10.11M EDGAR
2018-11-05 Esperion Therapeutics, Inc. (ESPR) Delisted Sell (S) −300,000 -$16.92M EDGAR
2018-06-11 Mirati Therapeutics, Inc. (MRTX) Delisted Buy (P) +579,150 $22.50M EDGAR
2018-03-26 Odonate Therapeutics, Inc. (ODT) Delisted Buy (P) +300,000 $6.82M EDGAR
2016-03-17 Mirati Therapeutics, Inc. (MRTX) Delisted Other (J) −375,298 $0 EDGAR
2016-01-15 Mirati Therapeutics, Inc. (MRTX) Delisted Other (J) −626,189 $0 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.