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 ARX 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/ARX"
Use Arkolith to show who owns ARX, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | GILDER GAGNON HOWE & CO LLC | $50.0M | 3.7M | ▲+1.1% Added · +40K sh | Q1 2026 | |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | $28.2M | 2.1M | ▲New +2.1M sh | Q1 2026 | |
| 3 | Cresset Asset Management, LLC | $24.6M | 1.8M | ▲New +1.8M sh | Q1 2026 | |
| 4 | ArrowMark Colorado Holdings LLC | $20.7M | 1.5M | ▼−5.8% Reduced · −96K sh | Q1 2026 | |
| 5 | CITADEL ADVISORS LLC | $15.3M | 1.1M | ▲+60% Added · +429K sh | Q1 2026 | |
| 6 | Woodline Partners LP | $4.9M | 367K | ▲+86% Added · +170K sh | Q1 2026 | |
| 7 | Point72 Asset Management, L.P. | $2.2M | 167K | ▲New +167K sh | Q1 2026 | |
| 8 | Trexquant Investment LP | $2.0M | 149K | ▲New +149K sh | Q1 2026 | |
| 9 | Schonfeld Strategic Advisors LLC | $1.5M | 114K | ▲+99% Added · +57K sh | Q1 2026 | |
| 10 | Jain Global LLC | $1.2M | 86K | ▲+72% Added · +36K sh | Q1 2026 | |
| 11 | Lighthouse Investment Partners, LLC | $1.1M | 85K | ▼−57% Reduced · −113K sh | Q1 2026 | |
| 12 | BOOTHBAY FUND MANAGEMENT, LLC | $1.1M | 79K | ▲+203% Added · +53K sh | Q1 2026 | |
| 13 | TIGER GLOBAL MANAGEMENT LLC | $1.0M | 75K | —Held | Q1 2026 | |
| 14 | Hudson Bay Capital Management LP | $738K | 55K | ▲+71% Added · +23K sh | Q1 2026 | |
| 15 | Interval Partners, LP | $662K | 50K | ▼−71% Reduced · −120K sh | Q1 2026 | |
| 16 | VANGUARD FIDUCIARY TRUST CO | $641K | 48K | ▲New +48K sh | Q1 2026 | |
| 17 | Engineers Gate Manager LP | $588K | 44K | ▲New +44K sh | Q1 2026 | |
| 18 | Jefferies Financial Group Inc. | $523K | 39K | ▼−13% Reduced · −6K sh | Q1 2026 | |
| 19 | Aquatic Capital Management LLC | $500K | 37K | ▲New +37K sh | Q1 2026 | |
| 20 | STATE STREET CORP | $498K | 37K | ▲+11% Added · +4K sh | Q1 2026 | |
| 21 | Zurcher Kantonalbank (Zurich Cantonalbank) | $432K | 32K | —Held | Q1 2026 | |
| 22 | Quadrature Capital Ltd | $374K | 28K | ▲+69% Added · +11K sh | Q1 2026 | |
| 23 | Centiva Capital, LP | $273K | 20K | ▼−84% Reduced · −107K sh | Q1 2026 | |
| 24 | Entropy Technologies, LP | $239K | 18K | ▲New +18K sh | Q1 2026 | |
| 25 | Man Group plc | $189K | 14K | ▲New +14K 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 23, 2026 | Green Jay Michael | Chief Financial Officer | Sell (S) | 50K | $639K |
| Mar 18, 2026 | Sternberg Matthew David | COO, Risk Exchange | Grant (A) | 181K | $0 |
| Mar 18, 2026 | Lee-Smith Christopher | Co-Founder, Head of Distrib., Director | Grant (A) | 129K | $0 |
| Mar 18, 2026 | ONeill Francis James | Co-Founder, Chief U/W Officer | Grant (A) | 129K | $0 |
| Mar 18, 2026 | RADKE JEFFREY L | Co-Founder, CEO, Director, 10% Owner | Grant (A) | 300K | $0 |
| Mar 17, 2026 | Green Jay Michael | Chief Financial Officer | Tax withholding (F) | 29K | $333K |
| Feb 2, 2026 | Green Jay Michael | Chief Financial Officer | Tax withholding (F) | 201K | $2.6M |
| Dec 8, 2025 | Meriwether Karen Sue | Director | Buy (P) | 542 | $8K |
| Nov 19, 2025 | Gaynor Samuel | Director | Buy (P) | 8K | $101K |
| Nov 19, 2025 | Lee-Smith Christopher | Co-Founder, Head of Distrib., Director | Buy (P) | 15K | $197K |
| Nov 18, 2025 | ONeill Francis James | Co-Founder, Chief U/W Officer | Buy (P) | 38K | $507K |
| Nov 17, 2025 | Sternberg Matthew David | COO, Risk Exchange | Buy (P) | 6K | $75K |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 34 funds | $10.4B |
| NVIDIA CORPNVDA | 33 funds | $19.5B |
| AMAZON.COM INCAMZN | 33 funds | $11.7B |
| COSTCO WHOLESALE CORPCOST | 33 funds | $2.3B |
| CITIGROUP INCC | 32 funds | $1.6B |
| SERVICENOW INCNOW | 32 funds | $1.1B |
| SCHWAB (CHARLES) CORPSCHW | 32 funds | $830.2M |
| TARGET CORPTGT | 32 funds | $755.2M |
| ALPHABET INC-CL AGOOGL | 31 funds | $9.8B |
| META PLATFORMS INC-CLASS AMETA | 31 funds | $7.5B |
| BROADCOM INCAVGO | 31 funds | $7.3B |
| TESLA INCTSLA | 31 funds | $4.5B |
Ranked by how many of ARX'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 ARX. 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.