This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/ZLAB/capital-change-brief"
Use Arkolith's capital_change_brief for ZLAB. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | RTW INVESTMENTS, LP | $123.7M | 6.6M | ▼−5.5% Reduced · −385K sh | Q1 2026 | |
| 2 | RA CAPITAL MANAGEMENT, L.P. | $107.4M | 5.7M | ▲New +5.7M sh | Q1 2026 | |
| 3 | Frazier Life Sciences Management, L.P. | $35.8M | 1.9M | —Held | Q1 2026 | |
| 4 | CITADEL ADVISORS LLC | $31.8M | 1.7M | ▲~0% Added · +786 sh | Q1 2026 | |
| 5 | ADAR1 Capital Management, LLC | $26.8M | 1.4M | ▲+14% Added · +179K sh | Q1 2026 | |
| 6 | FMR LLC | $23.7M | 1.3M | ▼−12% Reduced · −178K sh | Q1 2026 | |
| 7 | BlackRock, Inc. | $16.3M | 865K | ▲+36% Added · +230K sh | Q1 2026 | |
| 8 | Rock Springs Capital Management LP | $15.3M | 815K | ▲+0.4% Added · +3K sh | Q1 2026 | |
| 9 | UBS Group AG | $9.5M | 504K | ▼−72% Reduced · −1.3M sh | Q1 2026 | |
| 10 | B Group, Inc. | $8.5M | 451K | ▲+13% Added · +51K sh | Q1 2026 | |
| 11 | SCHRODER INVESTMENT MANAGEMENT GROUP | $7.0M | 393K | ▲+31% Added · +93K sh | Q1 2026 | |
| 12 | TWO SIGMA INVESTMENTS, LP | $5.8M | 310K | ▲10× Added · +280K sh | Q1 2026 | |
| 13 | PRICE T ROWE ASSOCIATES INC /MD/ | $5.5M | 292K | ▼−52% Reduced · −311K sh | Q1 2026 | |
| 14 | JANE STREET GROUP, LLC | $5.0M | 268K | ▼−30% Reduced · −114K sh | Q1 2026 | |
| 15 | AMERIPRISE FINANCIAL INC | $4.6M | 244K | ▲+34% Added · +62K sh | Q1 2026 | |
| 16 | Aberdeen Group plc | $4.5M | 238K | ▲New +238K sh | Q1 2026 | |
| 17 | Hennion & Walsh Asset Management, Inc. | $4.4M | 230K | ▲+7.5% Added · +16K sh | Q2 2026 | |
| 18 | Tidal Investments LLC | $3.5M | 184K | ▲New +184K sh | Q1 2026 | |
| 19 | DIMENSIONAL FUND ADVISORS LP | $3.3M | 174K | ▲+0.2% Added · +288 sh | Q1 2026 | |
| 20 | STATE STREET CORP | $2.2M | 119K | ▼−13% Reduced · −18K sh | Q1 2026 | |
| 21 | BNP Paribas Asset Management Holding S.A. | $2.2M | 117K | ▲+77% Added · +51K sh | Q1 2026 | |
| 22 | GOLDMAN SACHS GROUP INC | $2.1M | 111K | ▼−26% Reduced · −39K sh | Q1 2026 | |
| 23 | Walleye Capital LLC | $1.8M | 95K | ▼−75% Reduced · −279K sh | Q1 2026 | |
| 24 | MORGAN STANLEY | $1.8M | 94K | ▼−67% Reduced · −195K sh | Q1 2026 | |
| 25 | ALPS ADVISORS INC | $1.7M | 91K | ▼−1.4% 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 |
|---|---|---|---|---|---|
| Jul 2, 2026 | Du Ying | Chairperson & CEO, Director | Option exercise (M) | 11K | — |
| Jul 2, 2026 | Du Ying | Chairperson & CEO, Director | Tax withholding (F) | 4K | $83K |
| Jul 2, 2026 | Du Ying | Chairperson & CEO, Director | Option exercise (M) | 11K | $0 |
| Jul 2, 2026 | Du Ying | Chairperson & CEO, Director | Grant (A) | 80K | $0 |
| Jul 1, 2026 | Du Ying | Chairperson & CEO, Director | Option exercise (M) | 18K | — |
| Jul 1, 2026 | Du Ying | Chairperson & CEO, Director | Tax withholding (F) | 7K | $136K |
| Jul 1, 2026 | Du Ying | Chairperson & CEO, Director | Option exercise (M) | 18K | $0 |
| Jul 1, 2026 | GAYNOR RICHARD | Director | Buy (P) | 2K | $33K |
| Jun 30, 2026 | Du Ying | Chairperson & CEO, Director | Sell (S) | 7K | $130K |
| Jun 29, 2026 | Du Ying | Chairperson & CEO, Director | Option exercise (M) | 18K | — |
| Jun 29, 2026 | Du Ying | Chairperson & CEO, Director | Option exercise (M) | 18K | $0 |
| Jun 26, 2026 | Edmondson Frazor Titus III | Chief Legal Officer | Sell (S) | 4K | $72K |
| Company | Co-held by | Combined value |
|---|---|---|
| INTUITIVE SURGICAL INCISRG | 38 funds | $2.0B |
| ELI LILLY & COLLY | 37 funds | $3.7B |
| UNITEDHEALTH GROUP INCUNH | 37 funds | $2.0B |
| MICROSOFT CORPMSFT | 36 funds | $15.3B |
| BROADCOM INCAVGO | 36 funds | $9.5B |
| META PLATFORMS INC-CLASS AMETA | 36 funds | $7.9B |
| MICRON TECHNOLOGY INCMU | 36 funds | $4.6B |
| TAIWAN SEMICONDUCTOR-SP ADRTSM | 36 funds | $4.1B |
| COSTCO WHOLESALE CORPCOST | 36 funds | $3.0B |
| APPLIED MATERIALS INCAMAT | 36 funds | $2.7B |
| ADVANCED MICRO DEVICESAMD | 36 funds | $2.5B |
| HOME DEPOT INCHD | 36 funds | $2.3B |
Ranked by how many of ZLAB'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 ZLAB. 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.