Atara (ATRA) CEO Nguyen AnhCo Sells 5,062 Shares

What Happened Nguyen AnhCo, President, CEO and director of Atara Biotherapeutics (ATRA), reported the sale of 5,062 shares on August 17, 2026. The reported sale price was $8.08 per share, for a total reported value of $40,883. The filing indicates this was a sale-to-cover to satisfy tax withholding related to the vesting of previously granted restricted stock units (RSUs), not an independent open-market trade intended as an investment decision.

Key Details

• Transaction date: August 17, 2026; Form 4 filed August 26, 2026 (filed late relative to the typical 2-business‑day rule).
• Transaction type/code: Sale (S); reason per footnote: sale-to-cover for tax withholding on RSU vesting (F1).
• Shares sold: 5,062 at a reported price of $8.08; total reported proceeds $40,883.
• Footnote F2: the $8.08 price is a weighted average from a broker executing group sales on behalf of employees to cover withholding.
• Shares owned after the transaction: not disclosed in this filing.
• Exhibit listed: Exhibit 24 — Power of Attorney.

Context This was a routine “sale-to-cover” tied to RSU vesting (tax withholding), which is common and does not necessarily signal the insider’s view on the company’s prospects. The late filing is a regulatory timing issue to note but does not change the nature of the transaction.