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 ZWS 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/ZWS"
Use Arkolith to show who owns ZWS, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | $1.1B | 24.0M | ▲+1.2% Added · +293K sh | Q1 2026 | |
| 2 | VANGUARD GROUP INC | $777.7M | 16.7M | ▼−1.1% Reduced · −187K sh | Q4 2025 | |
| 3 | KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC | $486.5M | 10.9M | ▼−10% Reduced · −1.2M sh | Q1 2026 | |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | $397.1M | 8.9M | ▲New +8.9M sh | Q1 2026 | |
| 5 | STATE STREET CORP | $252.7M | 5.6M | ▲+3.4% Added · +185K sh | Q1 2026 | |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | $163.5M | 3.6M | ▲+2.9% Added · +104K sh | Q1 2026 | |
| 7 | Impax Asset Management Group plc | $117.0M | 2.6M | ▼−11% Reduced · −313K sh | Q1 2026 | |
| 8 | FULLER & THALER ASSET MANAGEMENT, INC. | $79.6M | 1.8M | ▲+6.0% Added · +101K sh | Q1 2026 | |
| 9 | VANGUARD FIDUCIARY TRUST CO | $46.6M | 1.0M | ▲New +1.0M sh | Q1 2026 | |
| 10 | FMR LLC | $30.1M | 671K | ▲+36% Added · +178K sh | Q1 2026 | |
| 11 | PUBLIC SECTOR PENSION INVESTMENT BOARD | $23.8M | 531K | ▲+3.0% Added · +16K sh | Q1 2026 | |
| 12 | Trexquant Investment LP | $16.9M | 376K | ▲+218% Added · +258K sh | Q1 2026 | |
| 13 | OBERWEIS ASSET MANAGEMENT INC/ | $15.8M | 352K | ▲+32% Added · +86K sh | Q1 2026 | |
| 14 | TUDOR INVESTMENT CORP ET AL | $14.0M | 312K | ▲+7.8% Added · +23K sh | Q1 2026 | |
| 15 | MAI Capital Management | $13.2M | 294K | ▲~0% Added · +69 sh | Q1 2026 | |
| 16 | Verition Fund Management LLC | $11.3M | 252K | ▲+48% Added · +82K sh | Q1 2026 | |
| 17 | Perpetual Ltd | $10.9M | 243K | ▼−27% Reduced · −90K sh | Q1 2026 | |
| 18 | PEREGRINE CAPITAL MANAGEMENT LLC | $8.5M | 189K | ▼−24% Reduced · −60K sh | Q1 2026 | |
| 19 | Fiera Capital Corp | $8.2M | 183K | ▲+28% Added · +40K sh | Q1 2026 | |
| 20 | Zurcher Kantonalbank (Zurich Cantonalbank) | $7.9M | 175K | ▼−39% Reduced · −111K sh | Q1 2026 | |
| 21 | HUNTINGTON NATIONAL BANK | $7.7M | 171K | ▼−25% Reduced · −56K sh | Q1 2026 | |
| 22 | MIROVA | $7.5M | 167K | ▲New +167K sh | Q1 2026 | |
| 23 | CITADEL ADVISORS LLC | $7.4M | 166K | ▼−12% Reduced · −23K sh | Q1 2026 | |
| 24 | Candriam S.C.A. | $7.2M | 160K | ▲+3.4% Added · +5K sh | Q1 2026 | |
| 25 | Universal- Beteiligungs- und Servicegesellschaft mbH | $6.9M | 154K | ▲+85% Added · +71K 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 | JAHNKE TIMOTHY J | Director | Sell (S) | 25K | $1.3M |
| Feb 17, 2026 | Chhabra Sudhanshu | VP-Zurn Business Systems | Sell (S) | 2K | $103K |
| Feb 17, 2026 | Troutman Michael | Chief Information Officer | Sell (S) | 448 | $23K |
| Feb 17, 2026 | PETERSON MARK W | Chief Administrative Officer | Sell (S) | 2K | $102K |
| Feb 17, 2026 | LaValle Jeffrey J. | VP, General Counsel & Sec'y | Sell (S) | 447 | $23K |
| Feb 11, 2026 | PETERSON MARK W | Chief Administrative Officer | Sell (S) | 4K | $195K |
| Feb 11, 2026 | Schoon Jeffrey A | President | Sell (S) | 1K | $66K |
| Feb 11, 2026 | Troutman Michael | Chief Information Officer | Sell (S) | 919 | $47K |
| Feb 11, 2026 | LaValle Jeffrey J. | VP, General Counsel & Sec'y | Sell (S) | 946 | $49K |
| Feb 11, 2026 | Pauli David J | Chief Financial Officer | Sell (S) | 812 | $42K |
| Feb 10, 2026 | Schoon Jeffrey A | President | Sell (S) | 12K | $623K |
| Feb 10, 2026 | Troutman Michael | Chief Information Officer | Sell (S) | 6K | $307K |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 144 funds | $61.4B |
| ELI LILLY & COLLY | 144 funds | $15.8B |
| ALPHABET INC-CL AGOOGL | 142 funds | $41.3B |
| MASTERCARD INC - AMA | 142 funds | $12.0B |
| VISA INC-CLASS A SHARESV | 142 funds | $11.6B |
| NVIDIA CORPNVDA | 141 funds | $83.8B |
| AMAZON.COM INCAMZN | 141 funds | $43.9B |
| BROADCOM INCAVGO | 141 funds | $32.1B |
| COSTCO WHOLESALE CORPCOST | 141 funds | $9.8B |
| META PLATFORMS INC-CLASS AMETA | 140 funds | $26.0B |
| ALPHABET INC-CL CGOOG | 140 funds | $25.0B |
| WALMART INCWMT | 140 funds | $10.5B |
Ranked by how many of ZWS'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 ZWS. 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.