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 $202.2M 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.

Disclosed Exposure

$202.22M

Companies

4

Total Filings

7

Lifetime Open-Market Net

$27.44M

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	$30.80	$198.61M	$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
ESPR	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	ESPR	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.