ECOR1 CAPITAL, LLC purchased 48.6% of their position (507.41K shares) of ATARA BIOTHERAPEUTICS, INC. on the open market
Open‑market purchase worth $4.74M — a major conviction buy. The strongest form of insider conviction signal.
P · 1 purchase
Filed: 5/11/2026ACC: 0000935836-26-000239
10% Owner
Since May 2026
+507.41K
Net shares
Net buyer
$4.74M
Total acquired
1
Open market trades
1B · 0S
1
Total transactions
507.41K acquired
Non-Derivative Transactions1
Common Stock
Indirect
Shares
+507.41K
Price / share
$9.35
Trade value
$4.74M
% of position
48.6%
5/7/2026
1.04M→1.55M
Total
Net shares
+507.41K
Net value
$4.74M
| Security | Date | Type | Shares | Price / Share | Trade Value | % of Position | Held Before | Held After |
|---|---|---|---|---|---|---|---|---|
| Common Stock Indirect | 5/7/2026 | P · Purchase | +507.41K | $9.35 | $4.74M | 48.6% | 1.04M | 1.55M |
| Total | +507.41K | $4.74M | ||||||
Derivative Transactions0
No derivative transactions reported