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, 2026STALEY CAPITAL ADVISERS INC holds $882,920 across 4 Biotechnology names. ATRA ranks #1 (65.0% of the industry book) .
All Filings in ATRA
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22 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $574,000 | 50,000 | Shares | Sole | 2026-08-11 | |
| 2026-03-31 | $236,500 | 50,000 | Shares | Sole | 2026-04-29 | |
| 2025-12-31 | $904,500 | 50,000 | Shares | Sole | 2026-02-05 | |
| 2025-09-30 | $716,500 | 50,000 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $579,000 | 75,000 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $475,200 | 80,000 | Shares | Sole | 2025-05-12 | |
| 2024-12-31 | $665,500 | 50,000 | Shares | Sole | 2025-02-07 | |
| 2024-09-30 | $325,200 | 40,000 | Shares | Sole | 2024-11-08 | |
| 2024-06-30 | $340,000 | 40,000 | Shares | Sole | 2024-08-13 | |
| 2024-03-31 | $694,000 | 1,000,000 | Shares | Sole | 2024-05-06 | |
| 2023-12-31 | $513,000 | 1,000,000 | Shares | Sole | 2024-02-12 | |
| 2023-09-30 | $1,480,000 | 1,000,000 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $1,207,500 | 750,000 | Shares | Sole | 2023-08-15 | |
| 2023-03-31 | $1,305,000 | 450,000 | Shares | Sole | 2023-05-10 | |
| 2022-12-31 | $1,476,000 | 450,000 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $1,701,000 | 450,000 | Shares | Sole | 2022-11-10 | |
| 2022-06-30 | $3,310,750 | 425,000 | Shares | Sole | 2022-08-05 | |
| 2022-03-31 | $2,787,000 | 300,000 | Shares | Sole | 2022-05-12 | |
| 2021-12-31 | $3,940,000 | 250,000 | Shares | Sole | 2022-02-08 | |
| 2021-09-30 | $4,475,000 | 250,000 | Shares | Sole | 2021-11-05 | |
| 2021-06-30 | $3,887,500 | 250,000 | Shares | Sole | 2021-08-10 | |
| 2021-03-31 | $3,590,000 | 250,000 | Shares | Sole | 2021-05-06 | |
| No filing history on record for this holder in this stock. | ||||||