Insider · CIK 0001290922

Brian N Cherry

director

Files at ATRA (Atara Biotherapeutics, Inc.). First filing Sep 4, 2026, latest Sep 4, 2026.

Track record

Not enough history

Fewer than three past buys with six months of prices.

Median 6-month excess

after past buys, n = 0

Hit rate

past buys that beat the index over 6 months

Open-market trades

1 / 0

$1000k bought, $0 sold

Where the trades landed

Last year at the company this insider has traded most, with each buy and sell on the bar it happened.

ATRA: Atara Biotherapeutics, Inc.

ATRAOct 9, 2026 · close 9.48

Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™

Signals

This insider’s open-market buys and sells, scored.

Score	Company	Value	Holdings	Price context	Filed
50Moderate	ATRAbuy Atara Biotherapeutics, Inc.	$1000k 104,166 shares	+167%	-	38 d ago

Transactions

Every row this insider has filed, newest first.

Date	Company	Transaction	Shares	Price	Value	Holdings after	Filed
Sep 4, 2026	ATRA Atara Biotherapeutics, Inc.	POpen-market purchase Common Stock	+104,166	$9.60	$1000k	166,486	38 d ago

Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.