NASDAQ:XOMA

Xoma Stock Insider Trading

Healthcare > Biotechnology

Buy XOMA

*Your capital is at risk

$40.17

+0 (+0%)

At Close: Jul 31, 2026

XOMA Stock Insider Power

Based on the 100 latest insides trades, we have calculated the insider power to be negative at -65.22. In total, the insiders bought 5.69M and sold 2.36M XOMA shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.

Insider Power (Last 100 transactions)	-65.22
● Buy	5.69M shares
● Sell	2.36M shares
32% Buy Activity Weak Positive Correlation
Sell Signal Medium Confidence Jul 14, 2026 Analysis Breakdown: Strongly supported by a very low Insider Power Score of -65.22. Confidence increased due to high data reliability score of 100.

Historical Insider Trades

Date	Type	Person	Role	Amount
Jul 14, 2026 Sell	Common Stock, $0.0075 par value per share U-Tender	Bvf Partners L P/il 10 Percent Owner	10% Owner	772 000 Value: $30.1M
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Perry Matthew D Director	Director	15 222 Value: $71.1K
Jul 14, 2026 Sell	Common Stock J-Other	Perry Matthew D Director	Director	24 138 Value: $181
Jul 14, 2026 Sell	Performance Stock Units D-Return	Sitko Bradley Chief Investment Officer	Officer	23 488 Value: $0
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Sitko Bradley Chief Investment Officer	Officer	250 000 Value: $7.50M
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Sitko Bradley Chief Investment Officer	Officer	300 000 Value: $5.60M
Jul 14, 2026 Sell	Depositary Shares - 8.375% Series B Cumulative Stock D-Return	Sitko Bradley Chief Investment Officer	Officer	2 000 Value: $100
Jul 14, 2026 Sell	8.625% Series A Cumulative Perpetual Preferred Stock D-Return	Sitko Bradley Chief Investment Officer	Officer	82 Value: $4
Jul 14, 2026 Sell	Common Stock J-Other	Sitko Bradley Chief Investment Officer	Officer	1 500 Value: $11
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Hernday Natasha Director	Director	4 881 Value: $120.6K
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Hernday Natasha Director	Director	10 967 Value: $234.6K
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Hernday Natasha Director	Director	8 996 Value: $160.7K
Jul 14, 2026 Sell	8.625% Series A Cumulative Perpetual Preferred Stock D-Return	Hernday Natasha Director	Director	4 000 Value: $200
Jul 14, 2026 Sell	Common Stock J-Other	Hernday Natasha Director	Director	9 304 Value: $70
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Hughes Owen Chief Executive Officer	CEO / President	100 000 Value: $1.87M
Jul 14, 2026 Sell	Depositary Shares - 8.375% Series B Cumulative Stock D-Return	Hughes Owen Chief Executive Officer	CEO / President	102 000 Value: $5K
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Wyszomierski Jack L Director	Director	10 967 Value: $234.6K
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Wyszomierski Jack L Director	Director	8 000 Value: $32.2K
Jul 14, 2026 Sell	Common Stock J-Other	Wyszomierski Jack L Director	Director	21 828 Value: $164
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Kosacz Barbara Director	Director	9 763 Value: $241.2K
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Kosacz Barbara Director	Director	10 967 Value: $234.6K
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Kosacz Barbara Director	Director	8 996 Value: $160.7K
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Kosacz Barbara Director	Director	5 101 Value: $158.3K
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Limber Joseph M Director	Director	10 967 Value: $234.6K
Jul 14, 2026 Sell	Stock Option (Right to Buy) D-Return	Limber Joseph M Director	Director	8 996 Value: $160.7K

About Insider Power

Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.

It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%^* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.

While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.

* October 6th, 2025 - Tested on 5562 stocks

ABOUT XOMA CORPORATION

XOMA Corporation operates as a biotechnology royalty aggregator in Europe, the United States, and the Asia Pacific. The company engages in helping biotech companies for enhancing human health. It acquires the potential future economics associated with pre-commercial therapeutic candidates that have been licensed to pharmaceutical or biotechnology companies. The company focuses on early to mid-stage clinical assets primarily in Phase 1 and 2 with ...

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