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 XXI 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/XXI"
Use Arkolith to show who owns XXI, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | VANGUARD FIDUCIARY TRUST CO | $11.7M | 1.8M | ▲New +1.8M sh | Q1 2026 | |
| 2 | STATE STREET CORP | $10.3M | 1.6M | ▲New +1.6M sh | Q1 2026 | |
| 3 | Alyeska Investment Group, L.P. | $1.6M | 250K | ▲New +250K sh | Q1 2026 | |
| 4 | Weiss Asset Management LP | $913K | 143K | ▲New +143K sh | Q1 2026 | |
| 5 | CITADEL ADVISORS LLC | $502K | 78K | ▲+36% Added · +21K sh | Q1 2026 | |
| 6 | Summit Trail Advisors, LLC | $400K | 63K | ▼−1.9% Reduced · −1K sh | Q1 2026 | |
| 7 | Marex Group plc | $284K | 44K | ▲+54% Added · +16K sh | Q1 2026 | |
| 8 | Vontobel Holding Ltd. | $210K | 33K | ▲New +33K sh | Q1 2026 | |
| 9 | PINNACLE ASSOCIATES LTD | $148K | 23K | —Held | Q1 2026 | |
| 10 | FOUNDATIONS INVESTMENT ADVISORS, LLC | $136K | 21K | ▲+35% Added · +6K sh | Q1 2026 | |
| 11 | BOKF, NA | $113K | 18K | ▲+57% Added · +6K sh | Q1 2026 | |
| 12 | Kovack Advisors, Inc. | $70K | 11K | ▼−23% Reduced · −3K sh | Q1 2026 | |
| 13 | CAPSTONE INVESTMENT ADVISORS, LLC | $68K | 11K | ▲New +11K sh | Q1 2026 | |
| 14 | GROUP ONE TRADING LLC | $23K | 4K | ▼−95% Reduced · −71K sh | Q1 2026 | |
| 15 | NewEdge Advisors, LLC | $5K | 833 | ▲+102% Added · +420 sh | Q1 2026 | |
| 16 | CWM, LLC | $4K | 693 | —Held | Q1 2026 | |
| 17 | Sound Income Strategies, LLC | $3K | 564 | —Held | Q1 2026 | |
| 18 | AdvisorNet Financial, Inc | $1K | 181 | ▲+2.3% Added · +4 sh | Q1 2026 | |
| 19 | MAI Capital Management | $640 | 100 | —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.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Jan 2, 2026 | Meehan Steven | Chief Financial Officer | Grant (A) | 797K | $0 |
| Jan 2, 2026 | Nguyen James Cong Hoan | General Counsel | Grant (A) | 297K | $0 |
| Dec 8, 2025 | Mallers Jack | Chief Executive Officer, Director | Grant (A) | 6.1M | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| CITIGROUP INCC | 23 funds | $1.1B |
| UBER TECHNOLOGIES INCUBER | 23 funds | $760.1M |
| NVIDIA CORPNVDA | 22 funds | $13.5B |
| AMAZON.COM INCAMZN | 22 funds | $7.7B |
| MICROSOFT CORPMSFT | 22 funds | $7.0B |
| BROADCOM INCAVGO | 22 funds | $4.5B |
| META PLATFORMS INC-CLASS AMETA | 22 funds | $4.5B |
| ALPHABET INC-CL AGOOGL | 22 funds | $4.0B |
| MICRON TECHNOLOGY INCMU | 22 funds | $3.6B |
| JPMORGAN CHASE & COJPM | 22 funds | $2.9B |
| HOME DEPOT INCHD | 22 funds | $1.8B |
| MASTERCARD INC - AMA | 22 funds | $1.7B |
Ranked by how many of XXI'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 XXI. 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.