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/ZBIO/capital-change-brief"
Use Arkolith's capital_change_brief for ZBIO. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | FMR LLC | $177.6M | 9.1M | ▲+18% Added · +1.4M sh | Q1 2026 | |
| 2 | NEA Management Company, LLC | $78.7M | 4.0M | ▲+14% Added · +500K sh | Q1 2026 | |
| 3 | Enavate Sciences GP, LLC | $76.6M | 3.9M | —Held | Q1 2026 | |
| 4 | FEDERATED HERMES, INC. | $61.1M | 3.1M | ▲+15% Added · +411K sh | Q1 2026 | |
| 5 | Polar Capital Holdings Plc | $49.8M | 2.5M | ▲+141% Added · +1.5M sh | Q1 2026 | |
| 6 | Fairmount Funds Management LLC | $46.1M | 2.4M | ▲+6.8% Added · +150K sh | Q1 2026 | |
| 7 | BlackRock, Inc. | $39.8M | 2.0M | ▲+15% Added · +270K sh | Q1 2026 | |
| 8 | NVP Associates, LLC | $35.9M | 1.8M | —Held | Q1 2026 | |
| 9 | STATE STREET CORP | $28.8M | 1.5M | ▲+236% Added · +1.0M sh | Q1 2026 | |
| 10 | VANGUARD CAPITAL MANAGEMENT LLC | $24.3M | 1.2M | ▲New +1.2M sh | Q1 2026 | |
| 11 | ALLIANCEBERNSTEIN L.P. | $32.6M | 897K | ▲49× Added · +879K sh | Q1 2026 | |
| 12 | EcoR1 Capital, LLC | $15.4M | 790K | —Held | Q1 2026 | |
| 13 | BALYASNY ASSET MANAGEMENT L.P. | $13.0M | 667K | ▲+245% Added · +474K sh | Q1 2026 | |
| 14 | ArrowMark Colorado Holdings LLC | $12.9M | 659K | ▼−12% Reduced · −92K sh | Q1 2026 | |
| 15 | GEODE CAPITAL MANAGEMENT, LLC | $12.8M | 656K | ▲+11% Added · +67K sh | Q1 2026 | |
| 16 | Woodline Partners LP | $11.5M | 591K | ▲New +591K sh | Q1 2026 | |
| 17 | GREAT POINT PARTNERS LLC | $10.2M | 524K | ▲New +524K sh | Q1 2026 | |
| 18 | Rock Springs Capital Management LP | $9.8M | 502K | —Held | Q1 2026 | |
| 19 | MARSHALL WACE, LLP | $9.8M | 502K | ▲71× Added · +495K sh | Q1 2026 | |
| 20 | MILLENNIUM MANAGEMENT LLC | $9.3M | 477K | ▲+870% Added · +428K sh | Q1 2026 | |
| 21 | BANK OF AMERICA CORP /DE/ | $7.6M | 388K | ▲+723% Added · +341K sh | Q1 2026 | |
| 22 | GOLDMAN SACHS GROUP INC | $7.5M | 381K | ▲+192% Added · +251K sh | Q1 2026 | |
| 23 | UBS Group AG | $7.2M | 367K | ▲+429% Added · +298K sh | Q1 2026 | |
| 24 | PRICE T ROWE ASSOCIATES INC /MD/ | $7.0M | 357K | ▼−3.2% Reduced · −12K sh | Q1 2026 | |
| 25 | TWO SIGMA INVESTMENTS, LP | $5.4M | 275K | ▲18× Added · +260K 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 |
|---|---|---|---|---|---|
| Jun 15, 2026 | Lu Hongbo | Director | Grant (A) | 19K | $0 |
| Jun 15, 2026 | Farmer Joseph L | See Remarks | Grant (A) | 175K | $0 |
| Jun 15, 2026 | MOULDER LEON O JR | See Remarks, Director | Grant (A) | 500K | $0 |
| Jun 15, 2026 | ORLOFF JOHN J | Director | Grant (A) | 19K | $0 |
| Jun 15, 2026 | von Moltke Lisa | See Remarks | Grant (A) | 150K | $0 |
| Jun 15, 2026 | Allen Patricia L | Director | Grant (A) | 19K | $0 |
| Jun 15, 2026 | Boylan James P | Director | Grant (A) | 19K | $0 |
| Jun 15, 2026 | ENRIGHT PATRICK G | Director | Grant (A) | 19K | $0 |
| Jun 15, 2026 | Fox Jennifer A. | See Remarks | Grant (A) | 125K | $0 |
| Jun 15, 2026 | Nunn Jason Raleigh | Director | Grant (A) | 19K | $0 |
| May 18, 2026 | MOULDER LEON O JR | Chief Executive Officer, Director | Buy (P) | 60K | $1.0M |
| Apr 29, 2026 | MOULDER LEON O JR | Chief Executive Officer, Director | Buy (P) | 35K | $617K |
| Company | Co-held by | Combined value |
|---|---|---|
| ELI LILLY & COLLY | 38 funds | $3.4B |
| MICROSOFT CORPMSFT | 37 funds | $14.1B |
| AMAZON.COM INCAMZN | 37 funds | $11.6B |
| NVIDIA CORPNVDA | 36 funds | $24.5B |
| BROADCOM INCAVGO | 36 funds | $9.6B |
| MICRON TECHNOLOGY INCMU | 36 funds | $5.4B |
| ADVANCED MICRO DEVICESAMD | 36 funds | $2.9B |
| COSTCO WHOLESALE CORPCOST | 36 funds | $2.5B |
| VISA INC-CLASS A SHARESV | 36 funds | $2.4B |
| LAM RESEARCH CORPLRCX | 36 funds | $2.3B |
| INTUITIVE SURGICAL INCISRG | 36 funds | $1.5B |
| UNITEDHEALTH GROUP INCUNH | 36 funds | $1.5B |
Ranked by how many of ZBIO'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 ZBIO. 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.