Transaction · 0000905148-26-003960

Nguyen AnhCo

Nguyen AnhCo, PRES, reported an open-market or private sale at Atara Biotherapeutics, Inc. involving 5062.000000 shares for an estimated $40882.74. Reported holdings after the transaction were 132775.000000 shares. A 10b5-1 reference was not detected in the stored filing text.

Open-market sellSEC transaction code SPRES
ATRAAtara Biotherapeutics, Inc.
Filing timeAug 26
Trade dateAug 17, 2026
Filing · SECView on SEC
InsiderProfile

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
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ATRA price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
ATRA since 2026-08-26Filed 10 days ago · 30 days of pre-filing context shaded
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Sell
Code S
Identifier
0000905148-26-003960
Common Stock
Transaction date
Aug 17, 2026
Filed Aug 26, 2026, 11:45 PM · 9d delay
Shares
5.06k sh
$808 per share
Estimated value
-$4.08M
Computed from shares × price
Holdings after
132k sh
Direct

Filing warnings

Notes recorded with this filing
1 warning
delayed filingThe filing was reported 9 calendar days after the transaction date.

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Delayed Filing Direct Ownership
0score
Filing-only score

0

Compact filing score computed from stored Form 4 facts. Version v1.

Neutral filing signal

This filing is broadly neutral on the filing-only scale. The Form 4 facts do not strongly tilt positive or negative.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

President and CEO

Officer YesDirector Yes10% NoOther No
Footnotes & amended
  1. F1

    Shares sold automatically to satisfy tax withholding obligations in connection with the vesting of previously granted restricted stock units, pursuant to a sale-to-cover provision in the award agreeme…

  2. F2

    The sale price of the reporting person's shares represents the weighted average price of all shares sold by a broker on August 17, 2026, on behalf of a group of employees of the Issuer to satisfy the…

Original filing · 0000905148-26-003960
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