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 ESTA 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/ESTA"
Use Arkolith to show who owns ESTA, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | RTW INVESTMENTS, LP | $150.8M | 2.7M | ▲+2.6% Added · +67K sh | Q1 2026 | |
| 2 | Nantahala Capital Management, LLC | $47.3M | 833K | ▼−16% Reduced · −155K sh | Q1 2026 | |
| 3 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | $39.1M | 689K | ▲+7.7% Added · +49K sh | Q1 2026 | |
| 4 | CITADEL ADVISORS LLC | $31.2M | 549K | ▲+175% Added · +350K sh | Q1 2026 | |
| 5 | RICE HALL JAMES & ASSOCIATES, LLC | $31.2M | 549K | ▼−16% Reduced · −103K sh | Q1 2026 | |
| 6 | BRAIDWELL LP | $26.3M | 464K | ▲New +464K sh | Q1 2026 | |
| 7 | SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | $22.3M | 393K | ▲+0.2% Added · +955 sh | Q1 2026 | |
| 8 | GILDER GAGNON HOWE & CO LLC | $15.2M | 269K | ▲+57% Added · +98K sh | Q1 2026 | |
| 9 | BOOTHBAY FUND MANAGEMENT, LLC | $13.2M | 232K | ▼−22% Reduced · −67K sh | Q1 2026 | |
| 10 | TUDOR INVESTMENT CORP ET AL | $9.7M | 171K | ▼−2.8% Reduced · −5K sh | Q1 2026 | |
| 11 | Trexquant Investment LP | $7.7M | 136K | ▲+13% Added · +16K sh | Q1 2026 | |
| 12 | CenterBook Partners LP | $7.7M | 135K | ▲+143% Added · +79K sh | Q1 2026 | |
| 13 | Hood River Capital Management LLC | $5.0M | 87K | ▲+50% Added · +29K sh | Q1 2026 | |
| 14 | Schonfeld Strategic Advisors LLC | $3.9M | 68K | ▲+356% Added · +53K sh | Q1 2026 | |
| 15 | Simplify Asset Management Inc. | $3.0M | 53K | ▼−27% Reduced · −20K sh | Q1 2026 | |
| 16 | VANGUARD PORTFOLIO MANAGEMENT LLC | $3.0M | 52K | ▲New +52K sh | Q1 2026 | |
| 17 | STATE STREET CORP | $2.6M | 45K | ▼−7.1% Reduced · −3K sh | Q1 2026 | |
| 18 | NorthRock Partners, LLC | $2.2M | 39K | ▼−4.9% Reduced · −2K sh | Q1 2026 | |
| 19 | Sofinnova Investments, Inc. | $1.9M | 34K | ▲+20% Added · +6K sh | Q1 2026 | |
| 20 | Engineers Gate Manager LP | $1.7M | 29K | ▲+64% Added · +11K sh | Q1 2026 | |
| 21 | POLEN CAPITAL MANAGEMENT LLC | $1.4M | 24K | ▲+39% Added · +7K sh | Q1 2026 | |
| 22 | Sigma Planning Corp | $1.2M | 20K | ▲+326% Added · +16K sh | Q1 2026 | |
| 23 | Hudson Bay Capital Management LP | $920K | 16K | ▲+56% Added · +6K sh | Q1 2026 | |
| 24 | AlTi Global, Inc. | $842K | 15K | ▲New +15K sh | Q1 2026 | |
| 25 | CAPITAL FUND MANAGEMENT S.A. | $778K | 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 25, 2026 | Chacon Quiros Juan Jose | Director | Sell (S) | 4K | $215K |
| Mar 23, 2026 | Chacon Quiros Juan Jose | Director | Other (J) | 179K | $0 |
| Mar 23, 2026 | Chacon Quiros Juan Jose | Director | Other (J) | 179K | $0 |
| Mar 23, 2026 | Chacon Quiros Juan Jose | Director | Sell (S) | 200 | $13K |
| Mar 23, 2026 | Chacon Quiros Juan Jose | Director | Sell (S) | 2K | $95K |
| Mar 23, 2026 | Chacon Quiros Juan Jose | Director | Sell (S) | 787 | $49K |
| Mar 23, 2026 | Chacon Quiros Juan Jose | Director | Sell (S) | 31K | $1.9M |
| Mar 9, 2026 | HARRIS CASSANDRA | Chief Financial Officer | Grant (A) | 13K | $0 |
| Mar 9, 2026 | HARRIS CASSANDRA | Chief Financial Officer | Grant (A) | 7K | $0 |
| Mar 6, 2026 | Mansbach Samuel Ross | Insider | Tax withholding (F) | 657 | $46K |
| Feb 18, 2026 | Caldini Filippo | Chief Executive Officer, Director | Grant (A) | 8K | $0 |
| Feb 18, 2026 | Caldini Filippo | Chief Executive Officer, Director | Grant (A) | 14K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| NVIDIA CORPNVDA | 48 funds | $24.5B |
| MICROSOFT CORPMSFT | 48 funds | $15.6B |
| AMAZON.COM INCAMZN | 48 funds | $13.7B |
| TAIWAN SEMICONDUCTOR-SP ADRTSM | 48 funds | $5.4B |
| BOSTON SCIENTIFIC CORPBSX | 47 funds | $1.6B |
| META PLATFORMS INC-CLASS AMETA | 46 funds | $7.9B |
| ELI LILLY & COLLY | 46 funds | $4.9B |
| APPLE INCAAPL | 45 funds | $18.3B |
| ALPHABET INC-CL AGOOGL | 45 funds | $9.3B |
| MICRON TECHNOLOGY INCMU | 45 funds | $4.6B |
| INTUITIVE SURGICAL INCISRG | 45 funds | $2.3B |
| SERVICENOW INCNOW | 45 funds | $2.3B |
Ranked by how many of ESTA'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 ESTA. 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.