Understand Stock

$XOMA

$45.00 +$0.78 (1.76%)

Deep Research with AI Research

Overview

$XOMA Overview Financials SEC Filings Executives News

Specialized Tools

Valuations P Insider Transactions P Congressional Trades P

Insider Transactions

Insider Transaction Summary

MARK N LAMPERT

3,635,758 shares

Net: +2,313,000 B/S: ∞

JULIAN BAKER

467,436 shares

Net: 0 B/S: -

PAUL D RUBIN

326,601 shares

Net: 0 B/S: -

PARTNERS L P/IL BVF

200,000 shares

Net: 0 B/S: -

Owen Hughes

191,264 shares

Net: +228,563 B/S: ∞

Jeffrey Trigilio

103,906 shares

Net: +133,906 B/S: ∞

Bradley Sitko

82,961 shares

Net: +40,449 B/S: ∞

DEEPSHIKHA DATTA

50,000 shares

Net: 0 B/S: -

Maricel Perea Montano

41,793 shares

Net: +65,243 B/S: ∞

James R Neal

36,822 shares

Net: 0 B/S: -

THOMAS M. BURNS

30,109 shares

Net: +7,546 B/S: 2.75

MATTHEW D PERRY

27,426 shares

Net: +3,586 B/S: ∞

JACK L WYSZOMIERSKI

25,116 shares

Net: +6,612 B/S: ∞

JOSEPH M LIMBER

12,820 shares

Net: +6,612 B/S: ∞

Natasha Hernday

12,592 shares

Net: +3,586 B/S: ∞

Barbara Kosacz

9,557 shares

Net: +3,586 B/S: ∞

Heather L Franklin

9,557 shares

Net: +3,586 B/S: ∞

NESS W DENMAN VAN

8,996 shares

Net: 0 B/S: -

PATRICK J MD PHD SCANNON

8,217 shares

Net: 0 B/S: -

PETER BARTON HUTT

8,000 shares

Net: 0 B/S: -

Timothy P Walbert

8,000 shares

Net: 0 B/S: -

John Varian

2,344 shares

Net: 0 B/S: -

Insider Name	Current Shares	Net Change (1yr)	Buy/Sell Ratio
MARK N LAMPERT	3,635,758	+2,313,000	∞
JULIAN BAKER	467,436	0	-
PAUL D RUBIN	326,601	0	-
PARTNERS L P/IL BVF	200,000	0	-
Owen Hughes	191,264	+228,563	∞
Jeffrey Trigilio	103,906	+133,906	∞
Bradley Sitko	82,961	+40,449	∞
DEEPSHIKHA DATTA	50,000	0	-
Maricel Perea Montano	41,793	+65,243	∞
James R Neal	36,822	0	-
THOMAS M. BURNS	30,109	+7,546	2.75
MATTHEW D PERRY	27,426	+3,586	∞
JACK L WYSZOMIERSKI	25,116	+6,612	∞
JOSEPH M LIMBER	12,820	+6,612	∞
Natasha Hernday	12,592	+3,586	∞
Barbara Kosacz	9,557	+3,586	∞
Heather L Franklin	9,557	+3,586	∞
NESS W DENMAN VAN	8,996	0	-
PATRICK J MD PHD SCANNON	8,217	0	-
PETER BARTON HUTT	8,000	0	-
Timothy P Walbert	8,000	0	-
John Varian	2,344	0	-

Individual Transactions

May 21, 2026

JACK L WYSZOMIERSKI

Grant/Award Acquisition

Change: +3,586

Price: $0.00

Shares: 25,116

Value: +$0

JOSEPH M LIMBER

Grant/Award Acquisition

Change: +3,586

Price: $0.00

Shares: 12,820

Value: +$0

Heather L Franklin

Grant/Award Acquisition

Change: +3,586

Price: $0.00

Shares: 9,557

Value: +$0

MATTHEW D PERRY

Grant/Award Acquisition

Change: +3,586

Price: $0.00

Shares: 27,426

Value: +$0

Barbara Kosacz

Grant/Award Acquisition

Change: +3,586

Price: $0.00

Shares: 9,557

Value: +$0

Natasha Hernday

Grant/Award Acquisition

Change: +3,586

Price: $0.00

Shares: 12,592

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
JACK L WYSZOMIERSKI	May 26	Grant/Award Acquisition (A) Compensation/Award	25,116	+3,586	$0.00	+$0
JOSEPH M LIMBER	May 26	Grant/Award Acquisition (A) Compensation/Award	12,820	+3,586	$0.00	+$0
Heather L Franklin	May 26	Grant/Award Acquisition (A) Compensation/Award	9,557	+3,586	$0.00	+$0
MATTHEW D PERRY	May 26	Grant/Award Acquisition (A) Compensation/Award	27,426	+3,586	$0.00	+$0
Barbara Kosacz	May 26	Grant/Award Acquisition (A) Compensation/Award	9,557	+3,586	$0.00	+$0
Natasha Hernday	May 26	Grant/Award Acquisition (A) Compensation/Award	12,592	+3,586	$0.00	+$0

May 14, 2026

MARK N LAMPERT

Derivative Conversion

Change: +2,313,000

Price: $4.03

Shares: 3,635,758

Value: +$9,321,390

Insider	Filing Date	Transaction	Shares	Change	Price	Value
MARK N LAMPERT	May 18	Derivative Conversion (C) Derivative Exercise	3,635,758	+2,313,000	$4.03	+$9,321,390

April 20, 2026

Bradley Sitko

Option Exercise/Conversion

Change: +3,737

Price: $0.00

Shares: 82,961

Value: +$0

Maricel Perea Montano

Option Exercise/Conversion

Change: +3,370

Price: $0.00

Shares: 41,793

Value: +$0

Jeffrey Trigilio

Option Exercise/Conversion

Change: +11,538

Price: $0.00

Shares: 103,906

Value: +$0

Owen Hughes

Option Exercise/Conversion

Change: +10,568

Price: $0.00

Shares: 191,264

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Bradley Sitko	Apr 22	Option Exercise/Conversion (M) Compensation/Award	82,961	+3,737	$0.00	+$0
Maricel Perea Montano	Apr 22	Option Exercise/Conversion (M) Compensation/Award	41,793	+3,370	$0.00	+$0
Jeffrey Trigilio	Apr 22	Option Exercise/Conversion (M) Compensation/Award	103,906	+11,538	$0.00	+$0
Owen Hughes	Apr 22	Option Exercise/Conversion (M) Compensation/Award	191,264	+10,568	$0.00	+$0

April 13, 2026

Jeffrey Trigilio

Option Exercise/Conversion

Change: +4,000

Price: $0.00

Shares: 94,000

Value: +$0

Jeffrey Trigilio

Tax Payment

Change: -1,632

Price: $36.76

Shares: 92,368

Value: -$59,992

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Jeffrey Trigilio	Apr 15	Option Exercise/Conversion (M) Compensation/Award	94,000	+4,000	$0.00	+$0
Jeffrey Trigilio	Apr 15	Tax Payment (F) Tax Payment	92,368	-1,632	$36.76	-$59,992

March 27, 2026

JOSEPH M LIMBER

Option Exercise/Conversion

Change: +3,026

Price: $11.20

Shares: 9,234

Value: +$33,891

Insider	Filing Date	Transaction	Shares	Change	Price	Value
JOSEPH M LIMBER	Mar 31	Option Exercise/Conversion (M) Compensation/Award	9,234	+3,026	$11.20	+$33,891

March 24, 2026

JACK L WYSZOMIERSKI

Option Exercise/Conversion

Change: +3,026

Price: $11.20

Shares: 21,530

Value: +$33,891

Insider	Filing Date	Transaction	Shares	Change	Price	Value
JACK L WYSZOMIERSKI	Mar 26	Option Exercise/Conversion (M) Compensation/Award	21,530	+3,026	$11.20	+$33,891

March 16, 2026

Owen Hughes

Grant/Award Acquisition

Change: +82,428

Price: $0.00

Shares: 180,696

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Owen Hughes	Mar 17	Grant/Award Acquisition (A) Compensation/Award	180,696	+82,428	$0.00	+$0

March 11, 2026

Maricel Perea Montano

Grant/Award Acquisition

Change: +26,289

Price: $0.00

Shares: 38,423

Value: +$0

Bradley Sitko

Grant/Award Acquisition

Change: +30,000

Price: $0.00

Shares: 49,822

Value: +$0

Jeffrey Trigilio

Grant/Award Acquisition

Change: +90,000

Price: $0.00

Shares: 90,000

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Maricel Perea Montano	Mar 13	Grant/Award Acquisition (A) Compensation/Award	38,423	+26,289	$0.00	+$0
Bradley Sitko	Mar 13	Grant/Award Acquisition (A) Compensation/Award	49,822	+30,000	$0.00	+$0
Jeffrey Trigilio	Mar 13	Grant/Award Acquisition (A) Compensation/Award	90,000	+90,000	$0.00	+$0

January 12, 2026

Jeffrey Trigilio

Grant/Award Acquisition

Change: +30,000

Price: $0.00

Shares: 30,000

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Jeffrey Trigilio	Jan 14	Grant/Award Acquisition (A) Compensation/Award	30,000	+30,000	$0.00	+$0