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Who

Barbara Kosacz

Director

Company insider

Files Form 4 as: Director, XOMA Royalty; Director, LeonaBio; Director, CERo Therapeutics Holdings; COO & General Counsel, Kronos Bio; Director, Locust Walk Acquisition.

Every Form 4 they filed

In numbers

Trades disclosed
48
Buys
1
Sells
1
Bought
$100K
Sold
$13K
Companies
5
Companies where not an officer
4
First trade
1 Jan 2019
Last trade
14 Jul 2026
Last filed
14 Jul 2026

Companies traded

Where they are an officer
Kronos BioOfficer · last 4 Jan 20241 buy · 1 sell
Everywhere else they filed: board seats, 10% stakes, other companies
XOMA RoyaltyDirector · Biotechnology · last 14 Jul 20260 buys · 0 sells
LONA LeonaBioDirector · Biotechnology · last 23 Jun 20260 buys · 0 sells
CERo Therapeutics HoldingsDirector · Biotechnology · last 14 Feb 20240 buys · 0 sells
Locust Walk AcquisitionDirector · last 12 Jan 20210 buys · 0 sells

Activity over time

1 Nov 2024 – 1 Oct 2026
101Nov 24May 25Nov 25Apr 26Oct 26

Buys above the line, sells below, each month.

Every trade

TradedCompanyWhatAmount
14 Jul 2026filed 14 Jul 2026XOMA RoyaltyBiotechnologySEC FORM 4 Code J—6,269filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivative · BiotechnologySEC FORM 4 Code D—19,979 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivative · BiotechnologySEC FORM 4 Code D—8,167 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivativeSEC FORM 4 Code D—19,979 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivativeSEC FORM 4 Code D—8,167 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivativeSEC FORM 4 Code D—6,152 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivativeSEC FORM 4 Code D—5,101 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivativeSEC FORM 4 Code D—8,996 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivativeSEC FORM 4 Code D—10,967 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivativeSEC FORM 4 Code D—9,763 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivative · BiotechnologySEC FORM 4 Code D—6,152 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivative · BiotechnologySEC FORM 4 Code D—5,101 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivative · BiotechnologySEC FORM 4 Code D—8,996 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivative · BiotechnologySEC FORM 4 Code D—10,967 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA Royaltyoption or derivative · BiotechnologySEC FORM 4 Code D—9,763 at $0.00filing
14 Jul 2026filed 14 Jul 2026XOMA RoyaltySEC FORM 4 Code J—6,269filing
23 Jun 2026filed 24 Jun 2026LONA LeonaBiooption or derivative · BiotechnologySEC FORM 4 Code A—28,000 at $0.00filing
23 Jun 2026filed 24 Jun 2026LONA LeonaBiooption or derivative · BiotechnologySEC FORM 4 Code A—28,000 at $0.00filing
21 May 2026filed 26 May 2026XOMA RoyaltyBiotechnologySEC FORM 4 Code A—3,586 at $0.00filing
21 May 2026filed 26 May 2026XOMA RoyaltySEC FORM 4 Code A—3,586 at $0.00filing

News

No headline names them, or the companies they trade most, lately.

Sectors

Not placed2

Buys in green, sells in red, by the company’s sector.

Related people

Nobody else traded the same names lately.