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 SIEB 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/SIEB"
Use Arkolith to show who owns SIEB, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | STATE STREET CORP | $277K | 144K | —Held | Q1 2026 | |
| 2 | VANGUARD FIDUCIARY TRUST CO | $217K | 113K | ▲New +113K sh | Q1 2026 | |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | $155K | 81K | ▲New +81K sh | Q1 2026 | |
| 4 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $110K | 57K | ▼−11% Reduced · −7K sh | Q1 2026 | |
| 5 | PANAGORA ASSET MANAGEMENT INC | $63K | 33K | ▼−0.1% Reduced · −38 sh | Q1 2026 | |
| 6 | CITADEL ADVISORS LLC | $53K | 27K | ▲New +27K sh | Q1 2026 | |
| 7 | Ameritas Investment Partners, Inc. | $3K | 1K | —Held | Q1 2026 | |
| 8 | CWM, LLC | $1K | 735 | ▲57× Added · +722 sh | Q1 2026 | |
| 9 | Sterling Capital Management LLC | $826 | 430 | ▼−51% Reduced · −455 sh | Q1 2026 | |
| 10 | IFP Advisors, Inc | $21 | 11 | ▲New +11 sh | Q1 2026 | |
| 11 | MAI Capital Management | $4 | 2 | ▲New +2 sh | Q1 2026 | |
| 12 | ROTHSCHILD INVESTMENT LLC | $4 | 2 | ▲New +2 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 |
|---|---|---|---|---|---|
| Mar 9, 2026 | Gebbia Gloria E | Director, 10% Owner | Gift (G) | 6K | $0 |
| Mar 9, 2026 | Gebbia John J | CEO, Director, 10% Owner | Gift (G) | 6K | $0 |
| Jan 20, 2026 | Gebbia David | Insider | Gift (G) | 13K | $0 |
| Jan 20, 2026 | Gebbia Gloria E | Director, 10% Owner | Gift (G) | 140K | $0 |
| Jan 20, 2026 | Gebbia John M. | Insider | Other (J) | 26K | $0 |
| Jan 20, 2026 | Gebbia John J | CEO, Director, 10% Owner | Gift (G) | 140K | $0 |
| Jan 20, 2026 | Gebbia John M. | Insider | Gift (G) | 26K | $0 |
| Jan 20, 2026 | Gebbia Richard | Insider | Gift (G) | 13K | $0 |
| Jan 20, 2026 | Gebbia Richard | Insider | Other (J) | 13K | $0 |
| Jan 20, 2026 | Gebbia John M. | Insider | Gift (G) | 3K | $0 |
| Jan 20, 2026 | Gebbia David | Insider | Other (J) | 13K | $0 |
| Nov 20, 2025 | Gebbia Gloria E | Director, 10% Owner | Gift (G) | 128K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| NVIDIA CORPNVDA | 12 funds | $7.7B |
| APPLE INCAAPL | 12 funds | $5.4B |
| MICROSOFT CORPMSFT | 12 funds | $3.8B |
| AMAZON.COM INCAMZN | 12 funds | $3.7B |
| ALPHABET INC-CL AGOOGL | 12 funds | $2.8B |
| BROADCOM INCAVGO | 12 funds | $2.4B |
| META PLATFORMS INC-CLASS AMETA | 12 funds | $2.2B |
| TESLA INCTSLA | 12 funds | $1.7B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 12 funds | $1.3B |
| JOHNSON & JOHNSONJNJ | 12 funds | $1.2B |
| COSTCO WHOLESALE CORPCOST | 12 funds | $1.1B |
| MASTERCARD INC - AMA | 12 funds | $1.1B |
Ranked by how many of SIEB'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 SIEB. 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.