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.
Trade date
Aug 17, 2026
Filing date
Aug 26, 2026
View on SEC Insider profile
Estimated value-$40.8kShares × reported price
Shares traded5.06k$8.08 per share
Holdings after132kDirect
% of reported position traded3.67%This security and ownership context
How reported position traded is calculated

Shares sold ÷ (holdings after + shares sold). Estimated position before: 137,837 shares.

Row-level estimate for this security and ownership context, not the insider’s complete portfolio. Joint ownership, other transactions in the filing, amendments and footnotes can affect interpretation.

Filing warnings

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

ATRA price since this filing

Daily closing prices, with the filing date and available return windows
ATRA · Daily closing priceLoading daily prices…
Filing dateReturn windows appear as prices become available.
Pre-filing1mo ago1w ago1d ago
Returns since7d30d90d180d1y

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
5,062 sh
$8.08 per share
Estimated value
-$40.8k
Computed from shares × price
Holdings after
132,775 sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Delayed Filing Direct Ownership
Filing-only score

0 points

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.

How this score is calculated
  • direct_ownership+6 points

    direct_or_indirect_ownership = D

    Direct ownership reports the insider's personal stake.
  • delayed_filing-6 points

    reporting_delay_days = 9

    Filing delay exceeds the configured threshold.
Read the scoring methodology

Signed filing-only points, not a probability or expected return. Version v1.

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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