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 SIGI 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/SIGI"
Use Arkolith to show who owns SIGI, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | VANGUARD PORTFOLIO MANAGEMENT LLC | $260.8M | 3.5M | ▲New +3.5M sh | Q1 2026 | |
| 2 | FMR LLC | $188.6M | 2.5M | ▼−49% Reduced · −2.4M sh | Q1 2026 | |
| 3 | STATE STREET CORP | $175.4M | 2.3M | ▼−1.1% Reduced · −25K sh | Q1 2026 | |
| 4 | GEODE CAPITAL MANAGEMENT, LLC | $128.8M | 1.7M | ▲+2.9% Added · +48K sh | Q1 2026 | |
| 5 | FRONTIER CAPITAL MANAGEMENT CO LLC | $55.0M | 730K | ▲+19% Added · +115K sh | Q1 2026 | |
| 6 | JACOBS LEVY EQUITY MANAGEMENT, INC | $41.4M | 550K | ▼−19% Reduced · −126K sh | Q1 2026 | |
| 7 | Verition Fund Management LLC | $36.5M | 484K | ▲+9.9% Added · +44K sh | Q1 2026 | |
| 8 | VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. | $35.0M | 464K | ▼−57% Reduced · −613K sh | Q1 2026 | |
| 9 | VANGUARD FIDUCIARY TRUST CO | $31.4M | 416K | ▲New +416K sh | Q1 2026 | |
| 10 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | $27.9M | 370K | ▲+3.6% Added · +13K sh | Q1 2026 | |
| 11 | SYSTEMATIC FINANCIAL MANAGEMENT LP | $24.8M | 329K | ▲+0.5% Added · +2K sh | Q1 2026 | |
| 12 | MetLife Investment Management, LLC | $19.8M | 263K | ▼−12% Reduced · −34K sh | Q1 2026 | |
| 13 | VOLORIDGE INVESTMENT MANAGEMENT, LLC | $14.5M | 192K | ▼−8.1% Reduced · −17K sh | Q1 2026 | |
| 14 | Lighthouse Investment Partners, LLC | $12.0M | 159K | ▲New +159K sh | Q1 2026 | |
| 15 | Trexquant Investment LP | $11.4M | 151K | ▲+164% Added · +94K sh | Q1 2026 | |
| 16 | CITADEL ADVISORS LLC | $9.1M | 121K | ▲+146% Added · +72K sh | Q1 2026 | |
| 17 | EULAV Asset Management | $8.3M | 110K | —Held | Q1 2026 | |
| 18 | Schonfeld Strategic Advisors LLC | $6.9M | 91K | ▲+388% Added · +73K sh | Q1 2026 | |
| 19 | Dana Investment Advisors, Inc. | $6.8M | 90K | ▼−0.2% Reduced · −203 sh | Q1 2026 | |
| 20 | PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO | $5.7M | 76K | ▲~0% Added · +31 sh | Q1 2026 | |
| 21 | Vest Financial, LLC | $5.0M | 66K | ▲+66% Added · +26K sh | Q1 2026 | |
| 22 | New Age Alpha Advisors, LLC | $4.4M | 58K | ▼−3.6% Reduced · −2K sh | Q1 2026 | |
| 23 | PEREGRINE CAPITAL MANAGEMENT LLC | $3.8M | 51K | ▼−8.8% Reduced · −5K sh | Q1 2026 | |
| 24 | Man Group plc | $3.7M | 50K | ▲+27% Added · +10K sh | Q1 2026 | |
| 25 | PANAGORA ASSET MANAGEMENT INC | $3.4M | 46K | ▲18× Added · +43K 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 |
|---|---|---|---|---|---|
| Feb 17, 2026 | Harnett Anthony D. | SVP, Chief Accounting Officer | Sell (S) | 1K | $93K |
| Feb 6, 2026 | Marchioni John J. | President and CEO, Director | Grant (A) | 22K | $0 |
| Feb 6, 2026 | Marchioni John J. | President and CEO, Director | Tax withholding (F) | 9K | $852K |
| Feb 6, 2026 | Harnett Anthony D. | SVP, Chief Accounting Officer | Grant (A) | 2K | $0 |
| Feb 6, 2026 | Harnett Anthony D. | SVP, Chief Accounting Officer | Tax withholding (F) | 711 | $64K |
| Feb 6, 2026 | Eppers Joseph | EVP, Chief Investment Officer | Tax withholding (F) | 938 | $85K |
| Feb 6, 2026 | Eppers Joseph | EVP, Chief Investment Officer | Grant (A) | 3K | $0 |
| Feb 6, 2026 | Kamrowski Jeffrey F. | EVP, MUSIC | Grant (A) | 3K | $0 |
| Feb 6, 2026 | Kamrowski Jeffrey F. | EVP, MUSIC | Tax withholding (F) | 1K | $102K |
| Feb 6, 2026 | Lanza Michael H | EVP and General Counsel | Tax withholding (F) | 2K | $144K |
| Feb 6, 2026 | Lanza Michael H | EVP and General Counsel | Grant (A) | 4K | $0 |
| Feb 2, 2026 | Harnett Anthony D. | SVP, Chief Accounting Officer | Sell (S) | 955 | $81K |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 126 funds | $55.5B |
| APPLE INCAAPL | 124 funds | $68.0B |
| AMAZON.COM INCAMZN | 123 funds | $43.6B |
| ALPHABET INC-CL AGOOGL | 123 funds | $37.0B |
| ELI LILLY & COLLY | 123 funds | $14.3B |
| SERVICENOW INCNOW | 123 funds | $4.1B |
| BROADCOM INCAVGO | 122 funds | $28.7B |
| META PLATFORMS INC-CLASS AMETA | 122 funds | $24.9B |
| NETFLIX INCNFLX | 122 funds | $7.3B |
| NVIDIA CORPNVDA | 121 funds | $80.5B |
| TESLA INCTSLA | 121 funds | $17.5B |
| VISA INC-CLASS A SHARESV | 121 funds | $10.7B |
Ranked by how many of SIGI'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 SIGI. 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.