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 EFO 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/EFO"
Use Arkolith to show who owns EFO, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1.7M | 27K | ▲New +27K sh | Q1 2026 | |
| 2 | OSAIC HOLDINGS, INC. | $373K | 6K | ▲+504% Added · +5K sh | Q1 2026 | |
| 3 | CITADEL ADVISORS LLC | $294K | 5K | ▲New +5K sh | Q1 2026 | |
| 4 | JANE STREET GROUP, LLC | $241K | 4K | ▲New +4K sh | Q1 2026 | |
| 5 | Cassaday & Co Wealth Management LLC | $75K | 1K | ▲New +1K sh | Q1 2026 | |
| 6 | HARBOUR INVESTMENTS, INC. | $11K | 168 | ▲New +168 sh | Q1 2026 | |
| 7 | SIMPLEX TRADING, LLC | $1K | 21 | ▲New +21 sh | Q1 2026 | |
| 8 | MORGAN STANLEY | $105 | 1 | —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.
No Form 4 insider transactions on file yet.
| Class | 13F holders | Value held |
|---|---|---|
| TQQQcs | 157 funds | $462.3M |
| UPROcs | 68 funds | $60.4M |
| UYGULTRA FNCLS NEW | 47 funds | $17.8M |
| UDOWULTRPRO DOW30 | 39 funds | $26.4M |
| TBFSHRT 20+YR TRE | 24 funds | $11.7M |
| URTYULTR RUSSL2000 | 19 funds | $12.2M |
| UREULT R/EST NEW | 11 funds | $3.4M |
| EETMSCI EMRG ETF | 9 funds | $9.7M |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
| Company | Co-held by | Combined value |
|---|---|---|
| NVIDIA CORPNVDA | 16 funds | $112.0B |
| MICROSOFT CORPMSFT | 16 funds | $107.1B |
| APPLE INCAAPL | 16 funds | $96.5B |
| AMAZON.COM INCAMZN | 16 funds | $63.6B |
| SS SPDR S&P 500 ETF TRUST-USSPY | 16 funds | $57.7B |
| ALPHABET INC-CL AGOOGL | 16 funds | $50.9B |
| META PLATFORMS INC-CLASS AMETA | 16 funds | $48.5B |
| JPMORGAN CHASE & COJPM | 16 funds | $36.8B |
| ALPHABET INC-CL CGOOG | 16 funds | $30.8B |
| VISA INC-CLASS A SHARESV | 16 funds | $26.0B |
| ELI LILLY & COLLY | 16 funds | $19.4B |
| NETFLIX INCNFLX | 16 funds | $17.6B |
Ranked by how many of EFO's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
No filings captured for this ticker in the live stream yet.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for EFO. 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.