Arkolith/Insider Trading/ATRA/Form 4

EcoR1 Capital, LLC

10% OwnerAtara Biotherapeutics, Inc. (ATRA) · full profile →Form 4 · filed May 11, 2026
Net Buying
Open-Market Buys
$4.7M
Open-Market Sells
$0
Net Open-Market Flow
$4.7M
Transactions
1
1 non-derivative · 0 derivative

Non-Derivative Transactions (Table I)

DateActionSharesPriceValueOwned After
May 7, 2026Buy(P)507K$9.35$4.7M1.6M

Transaction Codes

P
Open-market purchase

Data Source & Provenance

Parsed from a single SEC EDGAR Form 4 filing (accession 0000935836-26-000239) within minutes of acceptance. Every field above traces to the original document. Verify it directly:

View original filing on SEC.govRaw Form 4 XML