Form Type: 4

SEC EDGAR Link
Accession Number:0001209191-15-068700
Date:2015-08-27
Issuer: ATARA BIOTHERAPEUTICS, INC. (ATRA)
Original Submission Date:

Reporting Person:

CIECHANOVER ISAAC E.
701 GATEWAY BOULEVARD
SUITE 200 SOUTH SAN FRANCISCO, CA 94080

Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
Title of SecurityTransaction Date2a. Deemed Execution Date Transaction CodeSharesAcquired or DisposedPrice per share 5. Amount of Securities Beneficially Owned Following Reported Transaction 6. Ownership Form Direct or IndirectNature of Indirect Ownership
COMMON STOCK 2015-08-27 S 1,500 d $38.15 378,682 indirect f3
COMMON STOCK 2015-08-27 S 500 d $39.44 378,182 indirect f3
COMMON STOCK 2015-08-27 S 600 d $40.44 377,582 indirect f3
COMMON STOCK 2015-08-28 S 1,500 d $39.20 376,082 indirect f3
COMMON STOCK 2015-08-28 S 1,100 d $40.07 374,982 indirect f3
COMMON STOCK 2015-08-27 0 $0.00 488,653 indirect f8
COMMON STOCK 2015-08-27 0 $0.00 180,000 indirect f9
COMMON STOCK 2015-08-27 0 $0.00 41,532 direct
Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, convertible securities
Title of Derivative Security Conversion or Exercise Price of Derivative Security Transaction Date Deemed Execution Date Transaction Code Number of Derivative Securities Acquired (A) or Disposed of (D) Date ExercisableExpiration Date Title and Amount of Securities Underlying Derivative Security Price of Derivative Security Number of derivative Securities Beneficially Owned Following Reported Transaction(s) Ownership Form: Direct (D) or Indirect (I) Nature of Indirect Beneficial Ownership
Footnotes
IDfootnote
f1 transaction pursuant to rule 10b5-1 plan adopted december 12, 2014.
f2 the price in column 4 is a weighted average sale price. the prices actually received ranged from $37.77 to $38.67. 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.
f3 shares 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.
f4 the price in column 4 is a weighted average sale price. the prices actually received ranged from $39.00 to $39.78. 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.
f5 the price in column 4 is a weighted average sale price. the prices actually received ranged from $40.275 to $40.57. 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.
f6 the price in column 4 is a weighted average sale price. the prices actually received ranged from $38.91 to $39.55. 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.
f7 the price in column 4 is a weighted average sale price. the prices actually received ranged from $39.98 to $40.17. 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.
f8 sheld are held by the ciechanover family grat, of which the reporting person is a trustee.
f9 sheld are held by the the ciechanover 2015 grat, of which the reporting person is a trustee.
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