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$XOMA

$41.70 +$0.01 (0.02%)

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Insider Transactions

Insider Transaction Summary

MARK N LAMPERT

1,322,758 shares

Net: 0 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: +42,449 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

23,840 shares

Net: 0 B/S: -

JACK L WYSZOMIERSKI

21,530 shares

Net: +3,026 B/S: ∞

JOSEPH M LIMBER

9,234 shares

Net: +3,026 B/S: ∞

Natasha Hernday

9,006 shares

Net: 0 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: -

Timothy P Walbert

8,000 shares

Net: 0 B/S: -

PETER BARTON HUTT

8,000 shares

Net: 0 B/S: -

Barbara Kosacz

5,971 shares

Net: 0 B/S: -

Heather L Franklin

5,971 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	1,322,758	0	-
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	+42,449	∞
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	23,840	0	-
JACK L WYSZOMIERSKI	21,530	+3,026	∞
JOSEPH M LIMBER	9,234	+3,026	∞
Natasha Hernday	9,006	0	-
NESS W DENMAN VAN	8,996	0	-
PATRICK J MD PHD SCANNON	8,217	0	-
Timothy P Walbert	8,000	0	-
PETER BARTON HUTT	8,000	0	-
Barbara Kosacz	5,971	0	-
Heather L Franklin	5,971	0	-
John Varian	2,344	0	-

Individual Transactions

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

December 04, 2025

Owen Hughes

Open Market Purchase

Change: +100,000

Price: $25.05

Shares: 102,000

Value: +$2,505,000

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Owen Hughes	Dec 08	Open Market Purchase (P) Market Purchase	102,000	+100,000	$25.05	+$2,505,000

September 22, 2025

THOMAS M. BURNS

Open Market Sale

Change: -4,300

Price: $35.98

Shares: 30,109

Value: -$154,714

Insider	Filing Date	Transaction	Shares	Change	Price	Value
THOMAS M. BURNS	Sep 23	Open Market Sale (S) Market Sale	30,109	-4,300	$35.98	-$154,714

September 19, 2025

Maricel Perea Montano

Option Exercise/Conversion

Change: +3,033

Price: $0.00

Shares: 12,134

Value: +$0

Bradley Sitko

Option Exercise/Conversion

Change: +6,712

Price: $0.00

Shares: 19,822

Value: +$0

THOMAS M. BURNS

Option Exercise/Conversion

Change: +11,846

Price: $0.00

Shares: 34,409

Value: +$0

Owen Hughes

Option Exercise/Conversion

Change: +35,567

Price: $0.00

Shares: 98,268

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Maricel Perea Montano	Sep 23	Option Exercise/Conversion (M) Compensation/Award	12,134	+3,033	$0.00	+$0
Bradley Sitko	Sep 23	Option Exercise/Conversion (M) Compensation/Award	19,822	+6,712	$0.00	+$0
THOMAS M. BURNS	Sep 23	Option Exercise/Conversion (M) Compensation/Award	34,409	+11,846	$0.00	+$0
Owen Hughes	Sep 23	Option Exercise/Conversion (M) Compensation/Award	98,268	+35,567	$0.00	+$0

September 10, 2025

Maricel Perea Montano

Option Exercise/Conversion

Change: +9,101

Price: $0.00

Shares: 9,101

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Maricel Perea Montano	Sep 12	Option Exercise/Conversion (M) Compensation/Award	9,101	+9,101	$0.00	+$0