Eric J. Hyllengren - 31 Mar 2025 Form 4 Insider Report for Atara Biotherapeutics, Inc. (ATRA)

Reporting relationship: Former EVP, CFO & COO
Issuer ticker: ATRA
Reported as of: 31 Mar 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 02 Apr 2025, 19:54:05 UTC
Prior SEC filing: 05 Mar 2025
Next SEC filing: 17 Jul 2025
Source filing: View source filing
Reporting owner signature: /s/ John Chao, Attorney-in-Fact for Eric J. Hyllengren

Key filing fact

Eric J. Hyllengren filed Form 4 for Atara Biotherapeutics, Inc. (ATRA) on 02 Apr 2025.

Key facts

This page summarizes Eric J. Hyllengren's Form 4 filing for Atara Biotherapeutics, Inc. (ATRA).
10 reported transactions and 10 derivative rows are listed below.
Accepted by SEC: 02 Apr 2025, 19:54.

Change

Previous filing in this sequence was filed on 05 Mar 2025.
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

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ATRA transaction Derivative

Employee Stock Option (Right to Buy)

Disposed to Issuer

Transaction value: $0
Shares: -1,900
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 31 Mar 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,900
Exercise price: $996.25
Footnotes: F4

ATRA transaction Derivative

Employee Stock Option (Right to Buy)

Disposed to Issuer

Transaction value: $0
Shares: -460
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 31 Mar 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 460
Exercise price: $961.75
Footnotes: F4

ATRA transaction Derivative

Employee Stock Option (Right to Buy)

Disposed to Issuer

Transaction value: $0
Shares: -496
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 31 Mar 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 496
Exercise price: $303.75
Footnotes: F4

ATRA transaction Derivative

Employee Stock Option (Right to Buy)

Disposed to Issuer

Transaction value: $0
Shares: -154
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 31 Mar 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 154
Exercise price: $303.75
Footnotes: F1, F4

ATRA transaction Derivative

Employee Stock Option (Right to Buy)

Disposed to Issuer

Transaction value: $0
Shares: -381
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 31 Mar 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 381
Exercise price: $427.63
Footnotes: F4

ATRA transaction Derivative

Employee Stock Option (Right to Buy)

Disposed to Issuer

Transaction value: $0
Shares: -350
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 31 Mar 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 350
Exercise price: $427.63
Footnotes: F2, F4

ATRA transaction Derivative

Employee Stock Option (Right to Buy)

Disposed to Issuer

Transaction value: $0
Shares: -262
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 31 Mar 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 262
Exercise price: $255.25
Footnotes: F4

ATRA transaction Derivative

Employee Stock Option (Right to Buy)

Disposed to Issuer

Transaction value: $0
Shares: -543
Change %: -77%
Price: $0.000000
Shares after: 160
Date: 31 Mar 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 543
Exercise price: $255.25
Footnotes: F3, F4

ATRA transaction Derivative

Employee Stock Option (Right to Buy)

Disposed to Issuer

Transaction value: $0
Shares: -331
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 31 Mar 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 331
Exercise price: $97.75
Footnotes: F4

ATRA transaction Derivative

Employee Stock Option (Right to Buy)

Disposed to Issuer

Transaction value: $0
Shares: -8,961
Change %: -77%
Price: $0.000000
Shares after: 2,656
Date: 31 Mar 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 8,961
Exercise price: $97.75
Footnotes: F3, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

Eric J. Hyllengren is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 4 footnotes

Footnote F1

1/11th of the shares subject to the stock option vested and became exercisable on May 1, 2023, and the remaining shares vested in equal monthly installments over the following ten (10) months, subject to the reporting person's continuous service.

Footnote F2

1/23rd of the shares subject to the stock option vested and became exercisable on May 1, 2023, and the remaining shares vested in equal monthly installments over the following twenty-two (22) months, subject to the reporting person's continuous service.

Footnote F3

1/35th of the shares subject to the stock option vested and became exercisable on May 1, 2023, and the remaining shares vest in equal monthly installments over the following thirty-four (34) months, subject to the reporting person's continuous service.

Footnote F4

This option was cancelled by mutual agreement of the Issuer and the reporting person, in exchange for which cancellation the reporting person will receive a total cash payment of $100 as consideration.