30 tracked 13F filers disclose a position in ATRA as of the latest SEC 13F filings, a combined $10.0M in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $3.3M | 700K | ▲New +700K sh | Q1 2026 | |
| 2 | Redmile Group, LLC | $2.1M | 442K | —Held | Q1 2026 | |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | $1.0M | 218K | →First observed position No prior filed position | Q1 2026 | |
| 4 | Point72 Asset Management, L.P. | $919K | 194K | ▲11× Added · +176K sh | Q1 2026 | |
| 5 | EcoR1 Capital, LLC | $471K | 100K | ▼−83% Reduced · −474K sh | Q1 2026 | |
| 6 | BlackRock, Inc. | $374K | 79K | ▲+18% Added · +12K sh | Q1 2026 | |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | $313K | 66K | ▲+6.0% Added · +4K sh | Q1 2026 | |
| 8 | UBS Group AG | $237K | 50K | ▲36× Added · +49K sh | Q1 2026 | |
| 9 | STALEY CAPITAL ADVISERS INC | $237K | 50K | —Held | Q1 2026 | |
| 10 | MILLENNIUM MANAGEMENT LLC | $226K | 48K | ▲New +48K sh | Q1 2026 | |
| 11 | JANE STREET GROUP, LLC | $160K | 34K | ▲+142% Added · +20K sh | Q1 2026 | |
| 12 | VANGUARD FIDUCIARY TRUST CO | $159K | 34K | →First observed position No prior filed position | Q1 2026 | |
| 13 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $155K | 33K | —Held | Q1 2026 | |
| 14 | STATE STREET CORP | $125K | 26K | —Held | Q1 2026 | |
| 15 | FMR LLC | $77K | 16K | ▼−5.3% Reduced · −918 sh | Q1 2026 | |
| 16 | NORTHERN TRUST CORP | $58K | 12K | —Held | Q1 2026 | |
| 17 | MORGAN STANLEY | $43K | 9K | ▼−43% Reduced · −7K sh | Q1 2026 | |
| 18 | ROYAL BANK OF CANADA | $20K | 4K | ▲+408% Added · +3K sh | Q1 2026 | |
| 19 | SBI Securities Co., Ltd. | $7K | 2K | ▲+12% Added · +170 sh | Q1 2026 | |
| 20 | Vanguard Global Advisers, LLC | $7K | 1K | →First observed position No prior filed position | Q1 2026 | |
| 21 | JONES FINANCIAL COMPANIES LLLP | $3K | 703 | —Held | Q1 2026 | |
| 22 | WELLS FARGO & COMPANY/MN | $1K | 251 | —Held | Q1 2026 | |
| 23 | JPMORGAN CHASE & CO | $933 | 216 | —Held | Q1 2026 | |
| 24 | Banque Transatlantique SA | $906 | 176 | —Held | Q1 2026 | |
| 25 | RHUMBLINE ADVISERS | $827 | 175 | —Held | Q1 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
Last quarter, 2 funds opened a new position in ATRA and 2 added to an existing one, while 1 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Combined value |
|---|---|---|
| AMAZON.COM INCAMZN | 10 funds | $5.3B |
| MICROSOFT CORPMSFT | 10 funds | $4.4B |
| BROADCOM INCAVGO | 10 funds | $3.2B |
| ALPHABET INC-CL CGOOG | 10 funds | $2.3B |
| COSTCO WHOLESALE CORPCOST | 10 funds | $1.5B |
| VISA INC-CLASS A SHARESV | 10 funds | $1.4B |
| ELI LILLY & COLLY | 10 funds | $1.2B |
| CHEVRON CORPCVX | 10 funds | $1.2B |
| MASTERCARD INC - AMA | 10 funds | $1.1B |
| ADVANCED MICRO DEVICESAMD | 10 funds | $993.5M |
| PROCTER & GAMBLE CO/THEPG | 10 funds | $775.1M |
| EXXON MOBIL CORPXOM | 10 funds | $723.9M |
Ranked by how many of ATRA's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| May 18, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell (S) | 2K | $22K |
| May 18, 2026 | Nguyen AnhCo | President and CEO, Director | Sell (S) | 5K | $48K |
| May 7, 2026 | EcoR1 Capital, LLC | 10% Owner | Buy (P) | 507K | $4.7M |
| May 7, 2026 | Panacea Innovation Ltd | 10% Owner | Sell (S) | 313K | $3.2M |
| Mar 2, 2026 | Nguyen AnhCo | President and CEO, Director | Sell (S) | 58 | $295 |
| Mar 2, 2026 | Nguyen AnhCo | President and CEO, Director | Sell (S) | 1K | $7K |
| Mar 2, 2026 | Nguyen AnhCo | President and CEO, Director | Sell (S) | 198 | $1K |
| Mar 2, 2026 | Nguyen AnhCo | President and CEO, Director | Sell (S) | 1K | $7K |
| Mar 2, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell (S) | 377 | $2K |
| Mar 2, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell (S) | 2K | $8K |
| Mar 2, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell (S) | 24 | $122 |
| Mar 2, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell (S) | 100 | $508 |
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/ATRA/capital-change-brief"
Use Arkolith's capital_change_brief for ATRA. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for ATRA. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.