New Positions
7 managers initiated
Top five by reported value
Atara Biotherapeutics Inc NASDAQ NMS - GLOBAL MARKET:ATRA
Institutional holders, quarter-over-quarter share deltas, and new and closed positions disclosed in Form 13F. Period 2025-12-31 · prior 2025-09-30.
7 new12 added23 reduced3 exited
Total Institutional Holders
42
as of 2025-12-31
Top Holder
EcoR1 Capital, LLC
$10.4M
Largest QoQ Increase
GLOBEFLEX CAPITAL L P
+61,766 sh
Largest QoQ Decrease
GSA CAPITAL PARTNERS LLP
-26,213 sh
New Positions(7)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| Point72 Asset Management, L.P. | 18,296 | +18,296 | $331.0K | +$331.0K | — |
| CITADEL ADVISORS LLC | 15,577 | +15,577 | $281.8K | +$281.8K | — |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 14,018 | +14,018 | $253.6K | +$253.6K | — |
| Walleye Capital LLC | 12,169 | +12,169 | $220.1K | +$220.1K | — |
| Connor, Clark & Lunn Investment Management Ltd. | 10,446 | +10,446 | $189.0K | +$189.0K | — |
| DIMENSIONAL FUND ADVISORS LP | 10,028 | +10,028 | $181.4K | +$181.4K | — |
| FEDERATED HERMES, INC. | 130 | +130 | $2.4K | +$2.4K | — |
Added To(12)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| GLOBEFLEX CAPITAL L P | 77,224 | +61,766 | $1.4M | +$1.2M | 399.6% |
| VANGUARD GROUP INC | 225,940 | +22,502 | $4.1M | +$1.2M | 11.1% |
| MARSHALL WACE, LLP | 148,632 | +32,836 | $2.7M | +$1.0M | 28.4% |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 32,691 | +18,691 | $591.4K | +$390.8K | 133.5% |
| RENAISSANCE TECHNOLOGIES LLC | 30,040 | +11,104 | $543.4K | +$272.1K | 58.6% |
| GEODE CAPITAL MANAGEMENT, LLC | 62,381 | +1,855 | $1.1M | +$261.6K | 3.1% |
| Quadrature Capital Ltd | 20,321 | +3,779 | $367.6K | +$130.7K | 22.8% |
| STATE STREET CORP | 26,453 | +1,200 | $478.5K | +$116.7K | 4.8% |
| BANK OF AMERICA CORP /DE/ | 10,387 | +4,542 | $187.9K | +$104.1K | 77.7% |
| NORTHERN TRUST CORP | 12,340 | +1,307 | $223.2K | +$65.1K | 11.8% |
| Tower Research Capital LLC (TRC) | 1,737 | +1,395 | $31.4K | +$26.5K | 407.9% |
| Cambridge Investment Research Advisors, Inc. | 22,864 | +5,755 | $414 | +$169 | 33.6% |
Reduced(23)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC | 573,183 | 0 | $10.4M | +$2.2M | 0.0% |
| Redmile Group, LLC | 441,701 | 0 | $8.0M | +$1.7M | 0.0% |
| MORGAN STANLEY | 15,991 | -19,947 | $289.3K | -$225.7K | -55.5% |
| UBS Group AG | 1,397 | -15,871 | $25.3K | -$222.2K | -91.9% |
| BlackRock, Inc. | 67,108 | -2,725 | $1.2M | +$213.3K | -3.9% |
| STALEY CAPITAL ADVISERS INC | 50,000 | 0 | $904.5K | +$188.0K | 0.0% |
| MACKENZIE FINANCIAL CORP | 58,668 | -5,148 | $1.0M | +$132.4K | -8.1% |
| FMR LLC | 17,156 | 0 | $310.4K | +$64.5K | 0.0% |
| JANE STREET GROUP, LLC | 13,990 | -8,070 | $253.1K | -$63.0K | -36.6% |
| SBI Securities Co., Ltd. | 1,404 | 0 | $25.4K | +$5.3K | 0.0% |
| Private Wealth Asset Management, LLC | 900 | 0 | $16.3K | +$3.4K | 0.0% |
| JONES FINANCIAL COMPANIES LLLP | 703 | 0 | $12.7K | +$3.1K | 0.0% |
| Royal Bank of Canada | 850 | -1,450 | $15.0K | -$2.0K | -63.0% |
| WELLS FARGO & COMPANY/MN | 251 | 0 | $4.5K | +$944 | 0.0% |
| JPMORGAN CHASE & CO | 216 | 0 | $3.9K | +$812 | 0.0% |
| Banque Transatlantique SA | 176 | 0 | $3.2K | +$664 | 0.0% |
| RHUMBLINE ADVISERS | 175 | 0 | $3.2K | +$658 | 0.0% |
| KERR FINANCIAL PLANNING Corp | 24 | 0 | $112 | -$210 | 0.0% |
| ACADIAN ASSET MANAGEMENT LLC | 54,048 | -2,368 | $976 | +$169 | -4.2% |
| Raiffeisen Bank International AG | 200 | 0 | $3.0K | +$141 | 0.0% |
| BNP PARIBAS ARBITRAGE, SNC | 46 | -4 | $832 | +$116 | -8.0% |
| ADVISOR GROUP HOLDINGS, INC. | 10 | 0 | $180 | +$42 | 0.0% |
| Rockefeller Capital Management L.P. | 8 | 0 | $145 | +$30 | 0.0% |
Sold Out(3)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| GROUP ONE TRADING, L.P. | 0 | -148 | $0 | -$2.1K | — |
| GSA CAPITAL PARTNERS LLP | 0 | -26,213 | $0 | -$376 | — |
| NEW YORK STATE COMMON RETIREMENT FUND | 0 | -32 | $0 | -$272 | — |
Top Holders by reported value
Ranked by the dollar value reported on the latest Form 13F. Share counts reflect long positions as of 2025-12-31.
| Manager | Shares | $ Value | Δ Shares | QoQ % |
|---|---|---|---|---|
| EcoR1 Capital, LLC | 573,183 | $10.4M | 0 | 0.0% |
| Redmile Group, LLC | 441,701 | $8.0M | 0 | 0.0% |
| VANGUARD GROUP INC | 225,940 | $4.1M | +22,502 | 11.1% |
| MARSHALL WACE, LLP | 148,632 | $2.7M | +32,836 | 28.4% |
| GLOBEFLEX CAPITAL L P | 77,224 | $1.4M | +61,766 | 399.6% |
| BlackRock, Inc. | 67,108 | $1.2M | -2,725 | -3.9% |
| GEODE CAPITAL MANAGEMENT, LLC | 62,381 | $1.1M | +1,855 | 3.1% |
| MACKENZIE FINANCIAL CORP | 58,668 | $1.0M | -5,148 | -8.1% |
| STALEY CAPITAL ADVISERS INC | 50,000 | $904.5K | 0 | 0.0% |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 32,691 | $591.4K | +18,691 | 133.5% |
| RENAISSANCE TECHNOLOGIES LLC | 30,040 | $543.4K | +11,104 | 58.6% |
| STATE STREET CORP | 26,453 | $478.5K | +1,200 | 4.8% |
| Quadrature Capital Ltd | 20,321 | $367.6K | +3,779 | 22.8% |
| Point72 Asset Management, L.P. | 18,296 | $331.0K | +18,296 | — |
| FMR LLC | 17,156 | $310.4K | 0 | 0.0% |
| MORGAN STANLEY | 15,991 | $289.3K | -19,947 | -55.5% |
| CITADEL ADVISORS LLC | 15,577 | $281.8K | +15,577 | — |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 14,018 | $253.6K | +14,018 | — |
| JANE STREET GROUP, LLC | 13,990 | $253.1K | -8,070 | -36.6% |
| NORTHERN TRUST CORP | 12,340 | $223.2K | +1,307 | 11.8% |
New & Closed Positions this quarter
Closed Positions
3 managers exited
Top five by prior-quarter value
Methodology
Form 13F is the SEC's quarterly disclosure for institutional investment managers exercising discretion over $100 million or more in qualifying U.S. equity securities. Managers must file within 45 days of each calendar quarter end, which is why holdings shown here reflect a snapshot at the period date — not real-time positioning.
Quarter-over-quarter deltas compare each manager's most recently reported share count for ATRA against its prior-quarter count. New positions are entries where the prior count was zero; closed positions are entries where the current count is zero. Amendments (13F-HR/A) replace prior filings for the same period.
Source: SEC EDGAR Form 13F (XML information tables). Dollar values are as reported by the manager and may use mid-quarter pricing conventions. CUSIP-to-ticker resolution is best-effort.