Form 4 Filing for Equillium, Inc. - Officer Stock Transactions

This filing details stock transactions by Tom Penny, Principal Accounting Officer of Equillium, Inc. on May 28, 2026. Mr. Penny acquired 65,000 shares of Common Stock at a price of $0.785 per share, followed by the sale of 65,000 shares of Common Stock at a weighted average price of $2.95 (ranging from $2.95 to $2.99). These sales were executed under a Rule 10b5-1 trading plan. Additionally, Mr. Penny exercised an employee stock option (right to buy) for 65,000 shares of Common Stock, with the underlying shares then being disposed of. Vesting terms for the option indicate that 25% vested on the first anniversary of the commencement date, with the remainder vesting over the subsequent three years in 36 equal monthly installments. Following these transactions, Mr. Penny holds 0 shares of Common Stock directly.