Beth C. Seidenberg - 31 May 2023 Form 4 Insider Report for Atara Biotherapeutics, Inc. (ATRA)

Footnote F1

These restricted stock units shall vest on the earlier of May 31, 2024 or the date of the next annual meeting of stockholders, subject to the Reporting Person's continuous service.

Footnote F2

The option shall vest on the earlier of May 31, 2024 or the date of the next annual meeting of stockholders, subject to the Reporting Person's continuous service.

Footnote F3

The shares are directly held by Kleiner Perkins Caufield & Byers XV, LLC ("KPCB XV"). All shares are held for convenience in the name of "KPCB Holdings, Inc., as nominee". The managing member of KPCB XV is KPCB XV Associates, LLC ("XV Associates"). The voting and dispositive control over the shares is shared by individual managing members of XV Associates, none of whom has veto power.

Footnote F4

The shares are directly held by KPCB XV Founders Fund, LLC ("KPCB XV FF"). All shares are held for convenience in the name of "KPCB Holdings, Inc., as nominee". The managing member of KPCB XV FF is XV Associates. The voting and dispositive control over the shares is shared by individual managing members of XV Associates, none of whom has veto power.

Footnote F5

Shares held by the Michael J. Seidenberg Irrevocable Trust, established July 1, 2013, of which the Reporting Person is a trustee.

Footnote F6

Shares held by the Samuel B. Seidenberg Irrevocable Trust, established July 1, 2013, of which the Reporting Person is a trustee.