SEC Form 4 · accession 0001209191-15-086408
Atara Biotherapeutics, Inc. · ATRA
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Isaac E. Ciechanover
Officer — Chief Executive Officer · Director
Period of report
Dec 17, 2015
Accepted (ET)
Dec 21, 2015 · 5:07 pm EST
Rule 10b5-1 plan
unknown — predates the checkbox
Issuer CIK
0001604464
Table I — non-derivative securities
No Table I lines on this filing.
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Employee Stock Option (Right to Buy)F1 | $22.72 | Dec 17, 2015 | A | 220,000 | A | — | Dec 17, 2022 | Common Stock | 220,000 | 220,000 | D |
Explanation of responses
- F11/48th of the shares subject to the stock option vest and become exercisable each month following December 17, 2015.