Adaptive Biotechnologies CFO Sells Shares for Tax Withholding

Kyle Piskel, Chief Financial Officer of Adaptive Biotechnologies Corp (ADPT), filed a Form 4 disclosing the sale of 3,115 shares of common stock on May 18, 2026, at $13.04 per share. The transaction was a mandatory "sell to cover" arrangement to satisfy tax withholding obligations related to the vesting of restricted stock units (RSUs). According to the filing footnote, this sale was not a discretionary trade by the reporting person but rather mandated by the company's equity incentive plan requirements. Following the transaction, Piskel retains 256,725 shares of Adaptive Biotechnologies common stock. The filing was signed on May 20, 2026, and reports transactions that occurred on May 18, 2026.