The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
This stock page is the Follow view. The Build view lets your agent query XFOR owners, fund changes, insider filings, and source links through REST or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/XFOR"
Use Arkolith to show who owns XFOR, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | PERCEPTIVE ADVISORS LLC | $27.8M | 6.7M | ▲+6.7% Added · +423K sh | Q1 2026 | |
| 2 | BRAIDWELL LP | $13.5M | 3.3M | ▼−2.8% Reduced · −96K sh | Q1 2026 | |
| 3 | Nantahala Capital Management, LLC | $10.1M | 2.4M | —Held | Q1 2026 | |
| 4 | BVF INC/IL | $9.2M | 2.2M | —Held | Q1 2026 | |
| 5 | Woodline Partners LP | $4.1M | 1.0M | ▲~0% Added · +240 sh | Q1 2026 | |
| 6 | VANGUARD FIDUCIARY TRUST CO | $2.0M | 481K | ▲New +481K sh | Q1 2026 | |
| 7 | STATE STREET CORP | $1.7M | 404K | ▲+104% Added · +205K sh | Q1 2026 | |
| 8 | Venrock Adviser, LLC | $1.4M | 331K | ▲New +331K sh | Q1 2026 | |
| 9 | Hudson Bay Capital Management LP | $208K | 50K | ▲+56% Added · +18K sh | Q1 2026 | |
| 10 | Schonfeld Strategic Advisors LLC | $81K | 20K | ▲New +20K sh | Q1 2026 | |
| 11 | Jefferies Financial Group Inc. | $80K | 19K | ▼−25% Reduced · −7K sh | Q1 2026 | |
| 12 | Vanguard Personalized Indexing Management, LLC | $48K | 12K | ▲New +12K sh | Q1 2026 | |
| 13 | WINTON GROUP Ltd | $44K | 11K | ▲New +11K sh | Q1 2026 | |
| 14 | GROUP ONE TRADING LLC | $3K | 712 | ▼−82% Reduced · −3K sh | Q1 2026 | |
| 15 | Blue Trust, Inc. | $1K | 284 | —Held | Q1 2026 | |
| 16 | QUADRANT CAPITAL GROUP LLC | $529 | 128 | ▲New +128 sh | Q1 2026 | |
| 17 | SBI Securities Co., Ltd. | $223 | 54 | ▲+8.0% Added · +4 sh | 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.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Jan 1, 2026 | Bridger Gary | Director | Grant (A) | 110K | $0 |
| Jan 1, 2026 | de Craecker Francoise | Director | Grant (A) | 110K | $0 |
| Jan 1, 2026 | Stewart Murray | Director | Grant (A) | 110K | $0 |
| Jan 1, 2026 | WYZGA MICHAEL S | Director | Grant (A) | 110K | $0 |
| Oct 29, 2025 | Volpone John | President | Grant (A) | 2.3M | $0 |
| Oct 29, 2025 | KIRSKE DAVID | Chief Financial Officer | Grant (A) | 1.6M | $0 |
| Oct 29, 2025 | Craig Adam R | Executive Chairman, Director | Grant (A) | 2.3M | $0 |
| Oct 23, 2025 | Craig Adam R | Executive Chairman, Director | Buy (P) | 86K | $250K |
| Aug 14, 2025 | Volpone John | President | Grant (A) | 290K | $0 |
| Aug 14, 2025 | KIRSKE DAVID | Chief Financial Officer | Grant (A) | 193K | $0 |
| Aug 14, 2025 | KIRSKE DAVID | Chief Financial Officer | Grant (A) | 353K | $0 |
| Aug 14, 2025 | Craig Adam R | Executive Chairman, Director | Grant (A) | 290K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| INTUITIVE SURGICAL INCISRG | 16 funds | $1.3B |
| BOSTON SCIENTIFIC CORPBSX | 16 funds | $940.6M |
| AMAZON.COM INCAMZN | 15 funds | $6.3B |
| MICROSOFT CORPMSFT | 15 funds | $5.4B |
| BROADCOM INCAVGO | 15 funds | $4.0B |
| ALPHABET INC-CL AGOOGL | 15 funds | $4.0B |
| META PLATFORMS INC-CLASS AMETA | 15 funds | $3.4B |
| MICRON TECHNOLOGY INCMU | 15 funds | $2.6B |
| REVOLUTION MEDICINES INCRVMD | 15 funds | $736.7M |
| BIOGEN INCBIIB | 15 funds | $311.4M |
| NVIDIA CORPNVDA | 14 funds | $10.5B |
| TAIWAN SEMICONDUCTOR-SP ADRTSM | 14 funds | $3.0B |
Ranked by how many of XFOR's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for XFOR. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes. Every panel above is one call to the Arkolith API & MCP server.