BioAtla CEO Jay Short's Stock Transactions and Holdings Following 50-for-1 Share Consolidation

This Form 4 filing reports transactions by BioAtla, Inc. CEO Jay M. Short, Ph.D. involving the company's common stock. The filing discloses two transactions where shares were disposed of to satisfy tax withholding obligations related to vesting restricted stock units: 639 shares at $0.168 per share on March 12, 2026, and 259 shares at $3.93 per share on May 31, 2026. Following these transactions, Dr. Short directly holds 52,294 shares. The filing also reveals that BioAtla effected a 50-for-1 share consolidation on April 6, 2026, with all share amounts adjusted to reflect this consolidation. Additionally, the filing discloses indirect holdings through various entities including family trusts and investment vehicles, with Dr. Short and his spouse managing investment decisions for Himalaya Parent LLC. These transactions represent routine tax withholding procedures rather than market sales by the executive.