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Public ownership evidence

Atara Biotherapeutics, Inc (ATRA) Ownership Disclosures

Read ATRA insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-11-07T14:03:26.246Z

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2026-09-052026-09-04Cherry Brian NP104,166Not reported

First displayed source row from Recent Form 4 activity. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-09-04 and its public availability date is 2026-09-05. Subtracting those calendar dates gives 1 day of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code P: a purchase. A purchase code is only one eligibility check. Confirm reporting-owner role, amendment lineage and coverage before treating it as a strategy input.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC 0000905148-26-004085 ↗SEC 0000905148-26-003960 ↗13F 0001828301-26-000005 ↗

Recent Form 4 activity

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2026-09-052026-09-04Cherry Brian NP104,166Not reported
2026-08-272026-08-17Nguyen AnhCoS5,062Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

Inspect all 39 displayed rows: Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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XTX Topco Ltd2026-06-302026-08-1515,303$175,678None
OSAIC HOLDINGS, INC.2026-06-302026-08-1510$114None
JANE STREET GROUP, LLC2026-06-302026-08-159$103None
JANE STREET GROUP, LLC2026-06-302026-08-1530,336$348,257None
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-1512,680$145,566None
JONES FINANCIAL COMPANIES LLLP2026-06-302026-08-15803$8,440None
ADAGE CAPITAL PARTNERS GP, L.L.C.2026-06-302026-08-15850,000$9,758,000None
ROYAL BANK OF CANADA2026-06-302026-08-153,650$42,000None
ROYAL BANK OF CANADA2026-06-302026-08-151,093$13,000None
BRIDGEWAY CAPITAL MANAGEMENT, LLC2026-06-302026-08-1514,000$160,720None
CITADEL ADVISORS LLC2026-06-302026-08-1510,123$116,212None
CITADEL ADVISORS LLC2026-06-302026-08-1536$413None
Redmile Group, LLC2026-06-302026-08-15441,701$5,070,727None
EcoR1 Capital, LLC2026-06-302026-08-151,552,000$17,816,960None
Point72 Asset Management, L.P.2026-06-302026-08-15687,718$7,895,003None
BARCLAYS PLC2026-06-302026-08-15304$3,490None
WELLS FARGO & COMPANY/MN2026-06-302026-08-15251$2,881None
VANGUARD CAPITAL MANAGEMENT LLC2026-06-302026-08-14247,047$2,836,100None
Vanguard Global Advisers, LLC2026-06-302026-08-141,456$16,715None
Rockefeller Capital Management L.P.2026-06-302026-08-148$92None
UBS Group AG2026-06-302026-08-14465$5,338None
UBS Group AG2026-06-302026-08-143,514$40,341None
BNP PARIBAS FINANCIAL MARKETS2026-06-302026-08-1446$528None
ACADIAN ASSET MANAGEMENT LLC2026-06-302026-08-1438,845$444,000None
MACKENZIE FINANCIAL CORP2026-06-302026-08-14233,249$2,677,699None
VANGUARD FIDUCIARY TRUST CO2026-06-302026-08-1443,036$494,053None
MORGAN STANLEY2026-06-302026-08-145$57None
MORGAN STANLEY2026-06-302026-08-141$16None
MORGAN STANLEY2026-06-302026-08-144$46None
MORGAN STANLEY2026-06-302026-08-149,002$103,343None
MORGAN STANLEY2026-06-302026-08-14166$1,906None
FMR LLC2026-06-302026-08-1416,238$186,412None
NORTHERN TRUST CORP2026-06-302026-08-1416,568$190,201None
NORTHERN TRUST CORP2026-06-302026-08-1423$264None
GEODE CAPITAL MANAGEMENT, LLC2026-06-302026-08-1312,364$141,938None
GEODE CAPITAL MANAGEMENT, LLC2026-06-302026-08-1362,764$720,986None
JPMORGAN CHASE & CO2026-06-302026-08-13116$1,296None
JPMORGAN CHASE & CO2026-06-302026-08-13100$1,117None
STALEY CAPITAL ADVISERS INC2026-06-302026-08-1250,000$574,000None

90-day public filing window, up to 50 source positions.

XTX Topco Ltd ↗OSAIC HOLDINGS, INC. ↗JANE STREET GROUP, LLC ↗JANE STREET GROUP, LLC ↗MILLENNIUM MANAGEMENT LLC ↗JONES FINANCIAL COMPANIES LLLP ↗ADAGE CAPITAL PARTNERS GP, L.L.C. ↗ROYAL BANK OF CANADA ↗ROYAL BANK OF CANADA ↗BRIDGEWAY CAPITAL MANAGEMENT, LLC ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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No records are available for this view.

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.