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STALEY CAPITAL ADVISERS INC

Position in ATRA — Atara Biotherapeutics, Inc.

CIK 1106565 PITTSBURGH, PA

Position in ATRA

as of Jun 30, 2026 · filed Aug 11, 2026
Position Value
$574,000
+$337,500 QoQ
Shares Held
50,000
0.0% QoQ
Ownership
0.498%
of shares outstanding
% of Portfolio
0.03%
of 13F equity value
Holder Rank
#9
of 36 holders
Holding Since
Mar 2021
22 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in ATRA Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Jun 30, 2026

STALEY CAPITAL ADVISERS INC holds $882,920 across 4 Biotechnology names. ATRA ranks #1 (65.0% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 ATRA
Atara Biotherapeutics, Inc.
This page
50,000 $574,000

All Filings in ATRA

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22 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $574,000 50,000
2026-03-31 $236,500 50,000
2025-12-31 $904,500 50,000
2025-09-30 $716,500 50,000
2025-06-30 $579,000 75,000
2025-03-31 $475,200 80,000
2024-12-31 $665,500 50,000
2024-09-30 $325,200 40,000
2024-06-30 $340,000 40,000
2024-03-31 $694,000 1,000,000
2023-12-31 $513,000 1,000,000
2023-09-30 $1,480,000 1,000,000
2023-06-30 $1,207,500 750,000
2023-03-31 $1,305,000 450,000
2022-12-31 $1,476,000 450,000
2022-09-30 $1,701,000 450,000
2022-06-30 $3,310,750 425,000
2022-03-31 $2,787,000 300,000
2021-12-31 $3,940,000 250,000
2021-09-30 $4,475,000 250,000
2021-06-30 $3,887,500 250,000
2021-03-31 $3,590,000 250,000