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 XBIO 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/XBIO"
Use Arkolith to show who owns XBIO, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | RENAISSANCE TECHNOLOGIES LLC | $368K | 137K | ▼−23% Reduced · −41K sh | Q1 2026 | |
| 2 | GEODE CAPITAL MANAGEMENT, LLC | $57K | 21K | ▲+58% Added · +8K sh | Q1 2026 | |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | $18K | 7K | ▲New +7K sh | Q1 2026 | |
| 4 | Tower Research Capital LLC (TRC) | $2K | 806 | ▼−80% Reduced · −3K 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 |
|---|---|---|---|---|---|
| Apr 21, 2026 | PARSLOW JAMES F | Interim CEO and CFO | Grant (A) | 100K | $0 |
| Dec 31, 2025 | Borisenko Grigory G. | Director | Grant (A) | 3K | $0 |
| Dec 31, 2025 | Kornberg Roger D. | Director | Grant (A) | 3K | $0 |
| Dec 31, 2025 | Dastoor Firdaus J. | Director | Grant (A) | 3K | $0 |
| Dec 31, 2025 | VINOGRADOV ALEXEY ANDREEVICH | Director | Grant (A) | 3K | $0 |
| Dec 11, 2024 | VINOGRADOV ALEXEY ANDREEVICH | Director | Grant (A) | 3K | $0 |
| Dec 11, 2024 | Dastoor Firdaus J. | Director | Grant (A) | 3K | $0 |
| Dec 11, 2024 | Borisenko Grigory G. | Director | Grant (A) | 3K | $0 |
| Dec 11, 2024 | Kornberg Roger D. | Director | Grant (A) | 3K | $0 |
| Jun 18, 2024 | PARSLOW JAMES F | Interim CEO and CFO | Grant (A) | 20K | $0 |
| Dec 11, 2023 | EISENBERG JEFFREY F | Chief Executive Officer, Director | Grant (A) | 20K | $0 |
| Dec 11, 2023 | Lockshin Curtis | Chief Sciencific Officer | Grant (A) | 10K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 12 funds | $187.2B |
| APPLE INCAAPL | 12 funds | $185.3B |
| NVIDIA CORPNVDA | 12 funds | $165.9B |
| AMAZON.COM INCAMZN | 12 funds | $124.0B |
| META PLATFORMS INC-CLASS AMETA | 12 funds | $76.7B |
| BROADCOM INCAVGO | 12 funds | $69.2B |
| ALPHABET INC-CL AGOOGL | 12 funds | $63.4B |
| ALPHABET INC-CL CGOOG | 12 funds | $52.4B |
| TESLA INCTSLA | 12 funds | $48.9B |
| JPMORGAN CHASE & COJPM | 12 funds | $46.7B |
| VISA INC-CLASS A SHARESV | 12 funds | $38.6B |
| ELI LILLY & COLLY | 12 funds | $38.3B |
Ranked by how many of XBIO'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 XBIO. 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.