AlphaYouEC
Insider buying
Ecor1 Capital, Llc bought $4.7M of Atara Biotherapeutics, Inc. (ATRA) stock
Ecor1 Capital, Llc, 10% owner of Atara Biotherapeutics, Inc. (ATRA), bought 507,407 shares of ATRA stock worth $4.7M, per an SEC Form 4 filed May 11, 2026.
It was an open-market purchase.
The trade happened on May 7, 2026, 4 days before it was made public.
ATRA has moved -2.4% since the trade date, from $9.93 to $9.69 (Sep 18, 2026 close).
- Traded
- May 7, 2026
- Disclosed
- May 11, 2026
- Filing delay
- 4 days
- Price since
- -2.4%
- Role
- 10% owner
- Source
- SEC Form 4
More ATRA insider and Congress trades
From a public SEC Form 4, linked above. Not investment advice, and not a recommendation to buy or sell.