[Drug Development Pipeline Progress]: Clinical trial results, regulatory approvals (FDA), and overall progress of XOMA's drug candidates directly impact investor confidence and thus the stock price.

[Partnerships and Licensing Agreements]: Announcements of new partnerships, licensing deals, or significant milestones in existing agreements can positively affect the stock as they validate XOMA's technology and provide potential revenue streams.

[Financial Performance]: XOMA's revenue, expenses, cash flow, and overall financial health influence investor perception of the company's long-term viability and profitability, affecting stock valuation.

[Market Conditions]: Broader market trends, especially within the biotechnology sector, along with economic conditions, can impact investor sentiment and trading activity, influencing XOMA's stock price.

[Competition]: The competitive landscape within the pharmaceutical industry, including the success of rival companies and alternative treatments, can affect XOMA's potential market share and future prospects, thus impacting the stock.

[News and Events]: Company-specific news such as earnings reports, press releases, and presentations, as well as industry events and conferences, can trigger volatility in the stock price.

[Investor Sentiment]: Public perception, investor confidence, and overall market sentiment toward XOMA and the biotechnology industry play a significant role in stock price fluctuations.