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 PROK 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/PROK"
Use Arkolith to show who owns PROK, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | SUVRETTA CAPITAL MANAGEMENT, LLC | $22.1M | 12.3M | —Held | Q1 2026 | |
| 2 | MORGAN STANLEY | $16.0M | 9.0M | ▲+1.6% Added · +139K sh | Q1 2026 | |
| 3 | MILLENNIUM MANAGEMENT LLC | $4.1M | 2.3M | ▲+24% Added · +437K sh | Q1 2026 | |
| 4 | VANGUARD GROUP INC | $3.7M | 1.6M | ▲+5.4% Added · +84K sh | Q4 2025 | |
| 5 | Artia Global Partners LP | $3.2M | 1.8M | ▼−1.7% Reduced · −31K sh | Q1 2026 | |
| 6 | Hennion & Walsh Asset Management, Inc. | $2.9M | 1.6M | ▲+7.2% Added · +108K sh | Q1 2026 | |
| 7 | BlackRock, Inc. | $2.5M | 1.4M | ▼−1.2% Reduced · −17K sh | Q1 2026 | |
| 8 | RENAISSANCE TECHNOLOGIES LLC | $2.2M | 1.3M | ▲+40% Added · +355K sh | Q1 2026 | |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | $2.2M | 1.2M | ▲+2.7% Added · +33K sh | Q1 2026 | |
| 10 | VANGUARD CAPITAL MANAGEMENT LLC | $2.1M | 1.1M | ▲New +1.1M sh | Q1 2026 | |
| 11 | MARSHALL WACE, LLP | $1.8M | 1.0M | ▲+65% Added · +399K sh | Q1 2026 | |
| 12 | BANK OF AMERICA CORP /DE/ | $1.3M | 753K | ▲+6.7% Added · +47K sh | Q1 2026 | |
| 13 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $1.1M | 628K | ▲+0.7% Added · +5K sh | Q1 2026 | |
| 14 | STATE STREET CORP | $997K | 557K | ▲+16% Added · +77K sh | Q1 2026 | |
| 15 | VANGUARD FIDUCIARY TRUST CO | $964K | 538K | ▲New +538K sh | Q1 2026 | |
| 16 | Woodline Partners LP | $895K | 500K | —Held | Q1 2026 | |
| 17 | GOLDMAN SACHS GROUP INC | $755K | 422K | ▼−38% Reduced · −259K sh | Q1 2026 | |
| 18 | TWO SIGMA INVESTMENTS, LP | $620K | 346K | ▼−26% Reduced · −119K sh | Q1 2026 | |
| 19 | UBS Group AG | $599K | 335K | ▼−20% Reduced · −82K sh | Q1 2026 | |
| 20 | Amundi | $522K | 292K | ▲+7.2% Added · +19K sh | Q1 2026 | |
| 21 | JANE STREET GROUP, LLC | $473K | 264K | ▼−46% Reduced · −230K sh | Q1 2026 | |
| 22 | NORTHERN TRUST CORP | $432K | 242K | —Held | Q1 2026 | |
| 23 | Squarepoint Ops LLC | $378K | 211K | ▼−40% Reduced · −140K sh | Q1 2026 | |
| 24 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $366K | 204K | ▼−49% Reduced · −194K sh | Q1 2026 | |
| 25 | BARCLAYS PLC | $262K | 146K | ▼−14% Reduced · −24K 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 1, 2026 | Culleton Bruce | Chief Executive Officer, Director | Grant (A) | 3.0M | $0 |
| Mar 1, 2026 | Girolamo Todd C | Chief Legal Officer | Grant (A) | 600K | $0 |
| Mar 1, 2026 | Coulston James | Chief Financial Officer | Grant (A) | 600K | $0 |
| Mar 1, 2026 | Weber Darin J. | Chief Regulatory Officer | Grant (A) | 400K | $0 |
| Nov 13, 2025 | Pereira Brian JG | Director | Sell (S) | 54K | $129K |
| Nov 13, 2025 | Pereira Brian JG | Director | Sell (S) | 448K | $1.1M |
| Nov 12, 2025 | Pereira Brian JG | Director | Sell (S) | 227K | $619K |
| Nov 12, 2025 | Pereira Brian JG | Director | Sell (S) | 28K | $75K |
| Jul 8, 2025 | Weber Darin J. | Chief Regulatory Officer | Sell (S) | 103K | $313K |
| Jun 3, 2025 | Legorreta Pablo G. | Director, 10% Owner | Other (J) | 3.8M | $0 |
| Jun 3, 2025 | Legorreta Pablo G. | Director, 10% Owner | Conversion (C) | 3.8M | $0 |
| Jun 3, 2025 | Legorreta Pablo G. | Director, 10% Owner | Conversion (C) | 3.8M | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| AMAZON.COM INCAMZN | 15 funds | $3.1B |
| MICROSOFT CORPMSFT | 15 funds | $1.8B |
| META PLATFORMS INC-CLASS AMETA | 15 funds | $1.5B |
| HOME DEPOT INCHD | 15 funds | $708.3M |
| UNITEDHEALTH GROUP INCUNH | 15 funds | $499.9M |
| INTUITIVE SURGICAL INCISRG | 15 funds | $453.2M |
| BOSTON SCIENTIFIC CORPBSX | 15 funds | $401.9M |
| NVIDIA CORPNVDA | 14 funds | $5.0B |
| TESLA INCTSLA | 14 funds | $1.4B |
| ALPHABET INC-CL AGOOGL | 14 funds | $1.4B |
| TAIWAN SEMICONDUCTOR-SP ADRTSM | 14 funds | $1.2B |
| MICRON TECHNOLOGY INCMU | 14 funds | $1.1B |
Ranked by how many of PROK'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 PROK. 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.