Transaction · 0000905148-26-004085

Cherry Brian N

Cherry Brian N, DIR, reported an open-market or private purchase at Atara Biotherapeutics, Inc. involving 104166.000000 shares for an estimated $999993.60. Reported holdings after the transaction were 166486.000000 shares. A 10b5-1 reference was not detected in the stored filing text.

Open-market buySEC transaction code PDIR
ATRAAtara Biotherapeutics, Inc.
Trade date
Sep 04, 2026
Filing date
Sep 04, 2026
View on SEC Insider profile
Estimated value$999kShares × reported price
Shares traded104k$9.60 per share
Holdings after166kDirect
% of reported position traded167.15%This security and ownership context
How reported position traded is calculated

Shares purchased ÷ (holdings after − shares purchased). Estimated position before: 62,320 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.

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 ago -5.8%1d ago -2.5%
Returns since7d -3.9%30d -2.9%90d180d1y

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Buy
Code P
Identifier
0000905148-26-004085
Common Stock
Transaction date
Sep 04, 2026
Filed Sep 04, 2026, 10:20 PM · 0d delay
Shares
104,166 sh
$9.60 per share
Estimated value
$999k
Computed from shares × price
Holdings after
166,486 sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Director Buy Direct Ownership Large Holdings Increase
Filing-only score

+36 points

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

Strong filing signal

This filing has a high positive filing-only score. It may deserve closer research, but it is not an investment recommendation.

How this score is calculated
  • open_market_purchase+12 points

    transaction_code = P

    Code P is a discretionary open-market purchase.
  • direct_ownership+6 points

    direct_or_indirect_ownership = D

    Direct ownership reports the insider's personal stake.
  • director_buy+6 points

    is_director = true

    Director open-market purchase.
  • large_holdings_increase+8 points

    large-holdings-increase signal matched

    Reported acquired shares meet the configured percentage of post-transaction holdings.
  • timely_filing+4 points

    reporting_delay_days = 0

    Filing reported within two business days of the transaction.
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

No officer title

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

    Represents shares purchased by the Reporting Person from the Issuer, through its sales agent, pursuant to that certain Sales Agreement, dated November 1, 2023, by and between the Issuer and TD Securit…

Original filing · 0000905148-26-004085
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