93 tracked 13F filers disclose a position in ZLAB as of the latest SEC 13F filings, a combined $490.5M in reported value. 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.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | RTW INVESTMENTS, LP | $124.9M | 6.6M | —Held | Q2 2026 | |
| 2 | RA CAPITAL MANAGEMENT, L.P. | $107.4M | 5.7M | ▲New +5.7M sh | Q1 2026 | |
| 3 | Frazier Life Sciences Management, L.P. | $36.1M | 1.9M | —Held | Q2 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 | $15.5M | 815K | —Held | Q2 2026 | |
| 9 | UBS Group AG | $9.5M | 504K | ▼−72% Reduced · −1.3M sh | Q1 2026 | |
| 10 | B Group, Inc. | $8.6M | 451K | —Held | Q2 2026 | |
| 11 | SCHRODER INVESTMENT MANAGEMENT GROUP | $7.0M | 393K | ▲+31% Added · +93K sh | Q1 2026 | |
| 12 | NAN FUNG TRINITY | $6.6M | 346K | —Held | Q2 2026 | |
| 13 | TWO SIGMA INVESTMENTS, LP | $5.8M | 310K | ▲10× Added · +280K sh | Q1 2026 | |
| 14 | PRICE T ROWE ASSOCIATES INC /MD/ | $5.5M | 292K | ▼−52% Reduced · −311K sh | Q1 2026 | |
| 15 | Spruce Street Capital LP | $5.3M | 279K | ▲New +279K sh | Q2 2026 | |
| 16 | JANE STREET GROUP, LLC | $5.0M | 268K | ▼−30% Reduced · −114K sh | Q1 2026 | |
| 17 | AMERIPRISE FINANCIAL INC | $4.6M | 244K | ▲+34% Added · +62K sh | Q1 2026 | |
| 18 | Aberdeen Group plc | $4.5M | 238K | ▲New +238K sh | Q1 2026 | |
| 19 | Hennion & Walsh Asset Management, Inc. | $4.4M | 230K | ▲+7.5% Added · +16K sh | Q2 2026 | |
| 20 | Nantahala Capital Management, LLC | $3.8M | 200K | ▲New +200K sh | Q2 2026 | |
| 21 | DIMENSIONAL FUND ADVISORS LP | $3.3M | 174K | ▲+0.2% Added · +288 sh | Q1 2026 | |
| 22 | SUPERSTRING CAPITAL MANAGEMENT LP | $3.0M | 156K | ▼−44% Reduced · −120K sh | Q2 2026 | |
| 23 | Tidal Investments LLC | $2.9M | 154K | ▼−16% Reduced · −30K sh | Q2 2026 | |
| 24 | Privium Fund Management B.V. | $2.3M | 122K | ▼−7.6% Reduced · −10K sh | Q2 2026 | |
| 25 | STATE STREET CORP | $2.3M | 121K | ▲+1.7% Added · +2K sh | Q2 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.
Last quarter, 15 funds opened a new position in ZLAB and 13 added to an existing one, while 12 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Combined value |
|---|---|---|
| NVIDIA CORPNVDA | 44 funds | $138.0B |
| ELI LILLY & COLLY | 43 funds | $25.7B |
| ADVANCED MICRO DEVICESAMD | 42 funds | $15.5B |
| UNITEDHEALTH GROUP INCUNH | 42 funds | $10.9B |
| MICROSOFT CORPMSFT | 41 funds | $91.3B |
| INTUITIVE SURGICAL INCISRG | 41 funds | $10.9B |
| AMAZON.COM INCAMZN | 40 funds | $59.7B |
| META PLATFORMS INC-CLASS AMETA | 40 funds | $37.8B |
| MICRON TECHNOLOGY INCMU | 40 funds | $13.4B |
| INTEL CORPINTC | 40 funds | $8.2B |
| BOSTON SCIENTIFIC CORPBSX | 40 funds | $5.7B |
| BROADCOM INCAVGO | 39 funds | $54.1B |
Ranked by how many of ZLAB's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 19, 2026 | Chen Yajing | Chief Financial Officer | Sell (S) | 260 | $7K |
| Aug 12, 2026 | Lis William | Director | Sell (S) | 9K | $213K |
| Aug 11, 2026 | Chen Yajing | Chief Financial Officer | Sell (S) | 619 | $15K |
| Jul 1, 2026 | GAYNOR RICHARD | Director | Buy (P) | 2K | $33K |
| Jun 30, 2026 | Du Ying | Chairperson & CEO, Director | Sell (S) | 7K | $130K |
| Jun 26, 2026 | Edmondson Frazor Titus III | Chief Legal Officer | Sell (S) | 4K | $72K |
| Jun 26, 2026 | Du Ying | Chairperson & CEO, Director | Sell (S) | 25K | $429K |
| Jun 26, 2026 | Chen Yajing | Chief Financial Officer | Sell (S) | 2K | $40K |
| Jun 22, 2026 | Lis William | Director | Sell (S) | 7K | $127K |
| May 18, 2026 | Du Ying | Chairperson & CEO, Director | Sell (S) | 50K | $950K |
| May 15, 2026 | Du Ying | Chairperson & CEO, Director | Sell (S) | 50K | $1.0M |
| May 14, 2026 | Edmondson Frazor Titus III | Chief Legal Officer | Sell (S) | 4K | $71K |
Connected entities for ZLAB
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.
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.