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 VSTM 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/VSTM"
Use Arkolith to show who owns VSTM, 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 | $34.9M | 6.6M | —Held | Q1 2026 | |
| 2 | BlackRock, Inc. | $32.8M | 6.2M | ▲+30% Added · +1.4M sh | Q1 2026 | |
| 3 | VANGUARD GROUP INC | $32.1M | 4.2M | ▲+19% Added · +674K sh | Q4 2025 | |
| 4 | Deep Track Capital, LP | $30.4M | 5.7M | —Held | Q1 2026 | |
| 5 | ARMISTICE CAPITAL, LLC | $24.3M | 4.6M | ▲+30% Added · +1.1M sh | Q1 2026 | |
| 6 | Nantahala Capital Management, LLC | $19.0M | 3.6M | ▲+676% Added · +3.1M sh | Q1 2026 | |
| 7 | STATE STREET CORP | $18.6M | 3.5M | ▲+9.2% Added · +297K sh | Q1 2026 | |
| 8 | VANGUARD CAPITAL MANAGEMENT LLC | $17.6M | 3.3M | ▲New +3.3M sh | Q1 2026 | |
| 9 | MILLENNIUM MANAGEMENT LLC | $12.8M | 2.4M | ▲+334% Added · +1.9M sh | Q1 2026 | |
| 10 | CITADEL ADVISORS LLC | $12.2M | 2.3M | ▼−1.9% Reduced · −45K sh | Q1 2026 | |
| 11 | MORGAN STANLEY | $11.9M | 2.2M | ▲+20% Added · +376K sh | Q1 2026 | |
| 12 | Alyeska Investment Group, L.P. | $10.9M | 2.0M | ▲New +2.0M sh | Q1 2026 | |
| 13 | GEODE CAPITAL MANAGEMENT, LLC | $9.1M | 1.7M | ▲+23% Added · +325K sh | Q1 2026 | |
| 14 | J. Goldman & Co LP | $8.9M | 1.7M | ▲+77% Added · +733K sh | Q1 2026 | |
| 15 | GOLDMAN SACHS GROUP INC | $7.9M | 1.5M | ▼−0.8% Reduced · −11K sh | Q1 2026 | |
| 16 | Qube Research & Technologies Ltd | $7.8M | 1.5M | ▲+479% Added · +1.2M sh | Q1 2026 | |
| 17 | ACORN CAPITAL ADVISORS, LLC | $7.8M | 1.5M | —Held | Q1 2026 | |
| 18 | FRANKLIN RESOURCES INC | $5.9M | 1.1M | ▲+19% Added · +180K sh | Q1 2026 | |
| 19 | Logos Global Management LP | $5.3M | 1.0M | ▼−41% Reduced · −700K sh | Q1 2026 | |
| 20 | Longaeva Partners L.P. | $4.3M | 808K | ▲New +808K sh | Q1 2026 | |
| 21 | VANGUARD PORTFOLIO MANAGEMENT LLC | $4.0M | 757K | ▲New +757K sh | Q1 2026 | |
| 22 | TWO SIGMA INVESTMENTS, LP | $3.5M | 667K | ▲+40% Added · +190K sh | Q1 2026 | |
| 23 | BAKER BROS. ADVISORS LP | $3.1M | 585K | ▲New +585K sh | Q1 2026 | |
| 24 | JANE STREET GROUP, LLC | $3.0M | 571K | ▲+78% Added · +250K sh | Q1 2026 | |
| 25 | Jefferies Financial Group Inc. | $2.9M | 556K | ▼−0.2% Reduced · −1K 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 20, 2026 | Calkins Daniel | Chief Financial Officer | Grant (A) | 57 | $327 |
| Feb 4, 2026 | Paterson Dan | President and CEO, Director | Sell (S) | 970 | $6K |
| Jan 21, 2026 | Paterson Dan | President and CEO, Director | Grant (A) | 214K | $0 |
| Jan 21, 2026 | Calkins Daniel | Chief Financial Officer | Grant (A) | 17K | $0 |
| Jan 12, 2026 | Calkins Daniel | Chief Financial Officer | Sell (S) | 5K | $36K |
| Jan 12, 2026 | Paterson Dan | President and CEO, Director | Sell (S) | 10K | $74K |
| Jan 6, 2026 | Kauffman Michael | President of Development, Director | Grant (A) | 200K | $0 |
| Dec 24, 2025 | Calkins Daniel | Chief Financial Officer | Sell (S) | 80 | $629 |
| Dec 16, 2025 | Stuglik Brian M | Director | Sell (S) | 592 | $5K |
| Dec 16, 2025 | Paterson Dan | President and CEO, Director | Sell (S) | 393 | $4K |
| Dec 16, 2025 | Gagnon Robert E. | Director | Sell (S) | 283 | $3K |
| Dec 11, 2025 | Paterson Dan | President and CEO, Director | Sell (S) | 2K | $20K |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 45 funds | $13.8B |
| BROADCOM INCAVGO | 45 funds | $8.9B |
| META PLATFORMS INC-CLASS AMETA | 45 funds | $6.9B |
| ELI LILLY & COLLY | 45 funds | $3.8B |
| NVIDIA CORPNVDA | 44 funds | $23.4B |
| AMAZON.COM INCAMZN | 44 funds | $10.8B |
| MICRON TECHNOLOGY INCMU | 44 funds | $5.1B |
| MASTERCARD INC - AMA | 44 funds | $3.1B |
| VISA INC-CLASS A SHARESV | 44 funds | $2.4B |
| AMERICAN EXPRESS COAXP | 44 funds | $1.1B |
| SCHWAB (CHARLES) CORPSCHW | 44 funds | $951.9M |
| BOSTON SCIENTIFIC CORPBSX | 44 funds | $930.5M |
Ranked by how many of VSTM'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 VSTM. 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.