NASDAQ:XOMA

Xoma Stock Insider Trading

Healthcare > Biotechnology

Buy XOMA

*Your capital is at risk

$41.70

+0.0100 (+0.0240%)

At Close: Jun 03, 2026

XOMA Stock Insider Power

Based on the 100 latest insides trades, we have calculated the insider power to be negative at -12.86. In total, the insiders bought 6.53M and sold 868.75K 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)	-12.86
● Buy	6.53M shares
● Sell	868.75K shares
84% Buy Activity Negligible or No Correlation
Buy Signal Low Confidence Mar 11, 2026 Analysis Breakdown: Weakened by a contradictory negative Insider Power Score. Confidence increased due to high data reliability score of 100. Supported by overwhelming buy-side pressure (84% buys).

Historical Insider Trades

Date	Type	Person	Role	Amount
May 21, 2025 Buy	Common Stock A-Award	Kosacz Barbara Director	Director	5 971 Value: $150.0K
May 21, 2025 Buy	Common Stock A-Award	Kosacz Barbara Director	Director	5 971 Value: $150.0K
May 21, 2025 Buy	Common Stock A-Award	Franklin Heather L Director	Director	5 971 Value: $150.0K
May 21, 2025 Buy	Common Stock A-Award	Hernday Natasha Director	Director	5 971 Value: $150.0K
May 21, 2025 Buy	Common Stock A-Award	Perry Matthew D Director	Director	5 971 Value: $150.0K
May 21, 2025 Buy	Non-Qualified Share Option (right to buy) A-Award	Limber Joseph M Director	Director	9 936 Value: $249.6K
May 21, 2025 Buy	Common Stock A-Award	Wyszomierski Jack L Director	Director	5 971 Value: $150.0K
May 20, 2025 Sell	Common Stock S-Sale	Hughes Owen Chief Executive Officer	CEO / President	25 637 Value: $650.7K
May 20, 2025 Sell	Common Stock S-Sale	Burns Thomas M. SVP, Finance & CFO	C-Suite Officer	10 482 Value: $266.0K
May 20, 2025 Sell	Common Stock S-Sale	Burns Thomas M. SVP, Finance & CFO	C-Suite Officer	10 482 Value: $266.0K
May 20, 2025 Sell	Common Stock S-Sale	Hughes Owen Chief Executive Officer	CEO / President	25 637 Value: $650.7K
May 19, 2025 Buy	Performance Stock Units M-Exempt	Hughes Owen Chief Executive Officer	CEO / President	53 359 Value: $1.47M
May 19, 2025 Buy	Common Stock M-Exempt	Hughes Owen Chief Executive Officer	CEO / President	53 359 Value: $1.47M
May 19, 2025 Buy	Performance Stock Units M-Exempt	Burns Thomas M. SVP, Finance & CFO	C-Suite Officer	17 773 Value: $488.4K
May 19, 2025 Buy	Common Stock M-Exempt	Burns Thomas M. SVP, Finance & CFO	C-Suite Officer	17 773 Value: $488.4K
May 19, 2025 Buy	Common Stock M-Exempt	Burns Thomas M. SVP, Finance & CFO	C-Suite Officer	17 773 Value: $488.4K
May 19, 2025 Buy	Performance Stock Units M-Exempt	Burns Thomas M. SVP, Finance & CFO	C-Suite Officer	17 773 Value: $488.4K
May 19, 2025 Buy	Common Stock M-Exempt	Hughes Owen Chief Executive Officer	CEO / President	53 359 Value: $1.47M
May 19, 2025 Buy	Performance Stock Units M-Exempt	Hughes Owen Chief Executive Officer	CEO / President	53 359 Value: $1.47M
May 16, 2025 Sell	Common Stock, $0.0075 par value per share S-Sale	Bvf Partners L P/il 10 Percent Owner	10% Owner	127 407 Value: $3.45M
May 16, 2025 Sell	Common Stock, $0.0075 par value per share S-Sale	Bvf Partners L P/il 10 Percent Owner	10% Owner	265 316 Value: $7.19M
May 16, 2025 Sell	Common Stock, $0.0075 par value per share S-Sale	Bvf Partners L P/il 10 Percent Owner	10% Owner	265 316 Value: $7.19M
May 16, 2025 Sell	Common Stock, $0.0075 par value per share S-Sale	Bvf Partners L P/il 10 Percent Owner	10% Owner	127 407 Value: $3.45M
Apr 07, 2025 Buy	Depositary Shares - 8.375% Series B Cumulative Stock P-Purchase	Sitko Bradley Chief Investment Officer	Officer	2 000 Value: $49.4K
Apr 07, 2025 Buy	Depositary Shares - 8.375% Series B Cumulative Stock P-Purchase	Sitko Bradley Chief Investment Officer	Officer	2 000 Value: $49.4K

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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