SEC Form 4 · accession 0001209191-15-051159
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
Jun 4, 2015
Accepted (ET)
Jun 8, 2015 · 6:42 pm EDT
Rule 10b5-1 plan
unknown — predates the checkbox
Issuer CIK
0001604464
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF2,F3 | Jun 4, 2015 | S | 1,800 | $41.22 | D | 405,582 | I | See Footnote |
| Common StockF4,F3 | Jun 4, 2015 | S | 1,500 | $42.76 | D | 404,082 | I | See Footnote |
| Common StockF5,F3 | Jun 4, 2015 | S | 500 | $43.15 | D | 403,582 | I | See Footnote |
| Common StockF6,F3 | Jun 5, 2015 | S | 1,600 | $43.74 | D | 401,982 | I | See Footnote |
| Common StockF7,F3 | Jun 5, 2015 | S | 900 | $44.64 | D | 401,082 | I | See Footnote |
| Common StockF3 | Jun 5, 2015 | S | 100 | $45.25 | D | 400,982 | I | See Footnote |
| Common StockF8 | holding | — | — | — | 488,653 | I | See Footnote | |
| Common StockF9 | holding | — | — | — | 180,000 | I | See Footnote | |
| Common Stock | holding | — | — | — | 35,625 | D |
Table II — derivative securities
No Table II lines on this filing.
Explanation of responses
- F1Transaction pursuant to Rule 10b5-1 Plan adopted December 12, 2014.
- F2The price in Column 4 is a weighted average sale price. The prices actually received ranged from $40.84 to $41.84. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.
- F3Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee.
- F4The price in Column 4 is a weighted average sale price. The prices actually received ranged from $42.02 to $43.01. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.
- F5The price in Column 4 is a weighted average sale price. The prices actually received ranged from $43.03 to $43.20. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.
- F6The price in Column 4 is a weighted average sale price. The prices actually received ranged from $43.20 to $44.10. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.
- F7The price in Column 4 is a weighted average sale price. The prices actually received ranged from $44.205 to $44.93. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.
- F8Sheld are held by the Ciechanover Family GRAT, of which the Reporting Person is a trustee.
- F9Sheld are held by the The Ciechanover 2015 GRAT, of which the Reporting Person is a trustee.