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Of the 8 tracked institutions holding ATRA, 4 have a 3-year clone track record — 4 of them beat the S&P. Average holder's clone alpha: +5.9pt. It's a gauge of who owns the name, not just how many.
Among the 8 tracked institutional investors we monitor, ATRA (ATARA BIOTHERAPEUTICS INC) is held with a combined value of $23.46M across 1,913,643 shares. The largest holder is ADAGE CAPITAL PARTNERS GP, L.L.C. with a position worth $9.76M (0.01% of their portfolio). CITADEL ADVISORS LLC opened a new position in the most recent quarter. 4 funds increased their holdings. 1 fund reduced its position.
Total Institutional Value
$23.46M
Total Shares Held
1,913,643
Institutional Holders
8
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $9.76M | 0.01% | +21.4% |
| 2 | Point72 Asset Management, L.P. | $7.90M | 0.01% | +254.0% |
| 3 | VANGUARD GROUP INC | $4.09M | 0.00% | +11.1% |
| 4 | BlackRock, Inc. | $969.54K | 0.00% | +6.9% |
| 5 | STATE STREET CORP | $303.68K | 0.00% | - |
| 6 | FMR LLC | $186.41K | 0.00% | - |
| 7 | MILLENNIUM MANAGEMENT LLC | $145.57K | 0.00% | -73.4% |
| 8 | CITADEL ADVISORS LLC | $116.63K | 0.00% | New |
SEC Schedule 13D (activist) and 13G (passive) filings for ATRA. Filed when an investor acquires 5%+ ownership.
As of the latest SEC 13F filings, ADAGE CAPITAL PARTNERS GP, L.L.C. is the largest institutional holder of ATRA with a position worth $9.76M, representing 0.01% of their portfolio. In total, 8 institutional investors hold ATRA with a combined value of $23.46M.
In the most recent quarter, 1 fund opened a new position in ATRA. Additionally, 4 increased their holdings and 1 reduced their positions.
Institutional investors hold $23.46M worth of ATRA stock across 8 positions. The largest institutional holder is ADAGE CAPITAL PARTNERS GP, L.L.C. with $9.76M in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For ATRA, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their ATRA positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
Last Close
$9.35
2026-10-21
YTD
-47.4%
37% of 52-week range
