Nguyen AnhCo 4

4 · Atara Biotherapeutics, Inc. · Filed Mar 11, 2026

AI-generated summary of this filing

Updated Mar 11, 2026

Atara Biotherapeutics (ATRA) CEO Nguyen AnhCo Receives RSU Award

What Happened

Nguyen AnhCo, President and CEO (also a director) of Atara Biotherapeutics, received a grant of 81,100 restricted stock units (RSUs) on 2026-03-09. The transaction is reported as an award/acquisition (code A) at $0.00 per share (typical for RSU grants, not a market purchase).

Key Details

Transaction date: 2026-03-09; Form 4 filed: 2026-03-11 (filed within the normal 2-business-day reporting window).
Amount: 81,100 RSUs granted; reported price: $0.00 (award).
Shares owned after transaction: not specified in the provided data.
Footnote (vesting): RSUs vest 1/8 of the total on the second Quarterly Vesting Date after March 9, 2026, then 1/8 on each of the next seven Quarterly Vesting Dates (Quarterly Vesting Dates = Mar 1, May 15, Aug 15, Nov 15; if a date is a weekend/holiday, the next business day). Vesting is subject to continuous employment.
No indication of a sale, exercise, 10b5-1 plan, tax-withholding sale, or late filing in the provided filing.

Context

RSU grants are deferred equity awards that convert to shares as they vest; receiving RSUs is not an immediate market purchase or sale. Vesting schedule and continued employment determine when the insider actually receives shares and any taxable event.

Form 4

Period: 2026-03-09

DirectorPresident and CEO

Transactions

Footnotes (1)

[F1]These restricted stock units ("RSUs") vest as to 1/8th of the total number of shares (rounded down to the next whole number of shares) on the second Quarterly Vesting Date (as defined below) following March 9, 2026, and as to 1/8th of the total number of shares (rounded down to the next whole number of shares) on the next seven Quarterly Vesting Dates, such that all of the shares subject to the RSUs shall be vested on the last Quarterly Vesting Date, subject to the reporting person's continuous employment. "Quarterly Vesting Date" means March 1, May 15, August 15, and November 15 of each year, provided that if such date falls on a weekend or holiday, the Quarterly Vesting Date shall be the first business day after such date.

Signature

/s/ John Chao, Attorney-in-Fact for AnhCo Nguyen|2026-03-11

1 file