Key facts
- This page summarizes Redmile Group, LLC's Form 4 filing for Atara Biotherapeutics, Inc. (ATRA).
- 5 reported transactions and 10 derivative rows are listed below.
- Accepted by SEC: 24 Jul 2026, 21:00.
Redmile Group, LLC - 22 Jul 2026 Form 4 Insider Report for Atara Biotherapeutics, Inc. (ATRA)
- Reporting relationship
- Director
- Issuer ticker
- ATRA
- Reported as of
- 22 Jul 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 24 Jul 2026, 21:00:10 UTC
- Prior SEC filing
- 15 Jun 2026
- Source filing
- View source filing
- Reporting owner signature
- By: /s/ Jeremy Green, Managing Member of Redmile Group, LLC
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Redmile Group, LLC filed Form 4 for Atara Biotherapeutics, Inc. (ATRA) on 24 Jul 2026.
Change
- Previous filing in this sequence was filed on 15 Jun 2026.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (2)
CIK 0001425738
Primary reporting owner
Redmile Group, LLC
- Relationship
- Director
- Address
- 900 LARKSPUR LANDING CIRCLE, SUITE 270, LARKSPUR
- Signature
- By: /s/ Jeremy Green, Managing Member of Redmile Group, LLC
- Signature date
- 24 Jul 2026
CIK 0001650527
Green Jeremy
- Relationship
- Director
- Address
- C/O REDMILE GROUP, LLC (NY OFFICE), 45 W. 27TH STREET, FLOOR 11, NEW YORK
- Signature
- /s/ Jeremy Green
- Signature date
- 24 Jul 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
ATRA
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +195,211
- Change %
- +44%
- Price
- Shares after
- 636,912
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Footnotes
- F4, F5
ATRA
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +195,211
- Change %
- +44%
- Price
- Shares after
- 636,912
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Footnotes
- F4, F5
ATRA
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -60
- Change %
- -0.01%
- Price
- Shares after
- 636,852
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Footnotes
- F4, F5
ATRA
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -60
- Change %
- -0.01%
- Price
- Shares after
- 636,852
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Footnotes
- F4, F5
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
ATRA
transaction
Derivative
Pre-Funded Warrants to Purchase Common Stock
Options Exercise
- Transaction value
- Shares
- -101,089
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Underlying class
- Common Stock
- Underlying amount
- 101,089
- Exercise price
- $0.002500
- Footnotes
- F1, F4, F5, F8
ATRA
transaction
Derivative
Pre-Funded Warrants to Purchase Common Stock
Options Exercise
- Transaction value
- Shares
- -101,089
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Underlying class
- Common Stock
- Underlying amount
- 101,089
- Exercise price
- $0.002500
- Footnotes
- F1, F4, F5, F8
ATRA
transaction
Derivative
Pre-Funded Warrants to Purchase Common Stock
Options Exercise
- Transaction value
- Shares
- -38,735
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Underlying class
- Common Stock
- Underlying amount
- 38,735
- Exercise price
- $0.002500
- Footnotes
- F2, F4, F5, F8
ATRA
transaction
Derivative
Pre-Funded Warrants to Purchase Common Stock
Options Exercise
- Transaction value
- Shares
- -38,735
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Underlying class
- Common Stock
- Underlying amount
- 38,735
- Exercise price
- $0.002500
- Footnotes
- F2, F4, F5, F8
ATRA
transaction
Derivative
Pre-Funded Warrants to Purchase Common Stock
Options Exercise
- Transaction value
- Shares
- -55,387
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Underlying class
- Common Stock
- Underlying amount
- 55,387
- Exercise price
- $0.002500
- Footnotes
- F3, F4, F5, F8
ATRA
transaction
Derivative
Pre-Funded Warrants to Purchase Common Stock
Options Exercise
- Transaction value
- Shares
- -55,387
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Underlying class
- Common Stock
- Underlying amount
- 55,387
- Exercise price
- $0.002500
- Footnotes
- F3, F4, F5, F8
ATRA
holding
Derivative
Pre-Funded Warrants to Purchase Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 1,090,907
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Underlying class
- Common Stock
- Underlying amount
- 1,090,907
- Exercise price
- $0.002500
- Footnotes
- F4, F6, F8
ATRA
holding
Derivative
Pre-Funded Warrants to Purchase Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 1,090,907
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Underlying class
- Common Stock
- Underlying amount
- 1,090,907
- Exercise price
- $0.002500
- Footnotes
- F4, F6, F8
ATRA
holding
Derivative
Pre-Funded Warrants to Purchase Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 2,126,725
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Underlying class
- Common Stock
- Underlying amount
- 2,126,725
- Exercise price
- $0.000100
- Footnotes
- F4, F7, F8
ATRA
holding
Derivative
Pre-Funded Warrants to Purchase Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 2,126,725
- Date
- 22 Jul 2026
- Ownership
- See Footnote
- Underlying class
- Common Stock
- Underlying amount
- 2,126,725
- Exercise price
- $0.000100
- Footnotes
- F4, F7, F8
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 8 footnotes
Footnote F1
The Pre-Funded Warrants are exercisable at any time on or after the original issuance on July 23, 2019 until the seven-year anniversary of the original issuance date, at an exercise price equal to $0.0025 per share, subject to a 9.99% beneficial ownership blocker.
Footnote F2
The Pre-Funded Warrants are exercisable at any time on or after the original issuance on May 29, 2020 until the seven-year anniversary of the original issuance date, at an exercise price equal to $0.0025 per share, subject to a 9.99% beneficial ownership blocker.
Footnote F3
The Pre-Funded Warrants are exercisable at any time on or after the original issuance on December 11, 2020 until the seven-year anniversary of the original issuance date, at an exercise price equal to $0.0025 per share, subject to a 9.99% beneficial ownership blocker.
Footnote F4
The reported securities are directly owned by certain private funds managed by Redmile Group, LLC (collectively, the "Funds") and may be deemed beneficially owned by Redmile Group, LLC ("Redmile") as investment manager of the Funds. The reported securities may also be deemed beneficially owned by Jeremy Green as the principal of Redmile. Each of Redmile and Mr. Green (the "Reporting Persons") disclaims beneficial ownership of the reported securities except to the extent of their pecuniary interest therein, if any. This report shall not be deemed an admission that such Reporting Persons are the beneficial owners of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.
Footnote F5
On July 22, 2026, the Reporting Persons exercised the reported Pre-Funded Warrants through a "cashless exercise" resulting in the Issuer withholding 60 shares of Common Stock to pay the exercise price and issuing the remaining 195,151 shares of Common Stock to the applicable Funds. The number of shares withheld to pay the aggregate exercise price for the cashless exercise of the Pre-Funded Warrants was based on the closing sale price per share of the Common Stock on the trading date immediately prior to the exercise date, per the terms of the Pre-Funded Warrants.
Footnote F6
The Pre-Funded Warrants are exercisable at any time on or after the original issuance date, at an exercise price equal to $0.0025 per share, subject to a 9.99% beneficial ownership blocker. The Pre-Funded Warrants have no expiration date.
Footnote F7
The Pre-Funded Warrants are exercisable at any time on or after the original issuance date, at an exercise price equal to $0.0001 per share, subject to a 9.99% beneficial ownership blocker. The Pre-Funded Warrants have no expiration date.
Footnote F8
The previous report on Form 3 inadvertently indicated that all of the Pre-Funded Warrants beneficially owned by the Reporting Persons have an exercise price of $0.0001 per share and no expiration date. Footnotes (1), (2), (3), (6) and (7) and the related disclosures correct the Form 3 with respect to the terms of the Pre-Funded Warrants beneficially owned by the Reporting Persons.
SEC remarks
Mr. Nachi Subramanian, a member of the board of directors of the Issuer and a managing director of Redmile, was elected to the board of the Issuer as a representative of Redmile and its affiliates. As a result, the Reporting Persons are directors by deputization for purposes of Section 16 of the Securities Exchange Act of 1934, as amended.