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/PRTA/capital-change-brief"
Use Arkolith's capital_change_brief for PRTA. 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 | $73.4M | 7.6M | —Held | Q1 2026 | |
| 2 | Rubric Capital Management LP | $48.6M | 5.0M | ▲+36% Added · +1.3M sh | Q1 2026 | |
| 3 | BlackRock, Inc. | $45.1M | 4.6M | ▲+13% Added · +537K sh | Q1 2026 | |
| 4 | STATE STREET CORP | $18.8M | 1.9M | ▼−15% Reduced · −329K sh | Q1 2026 | |
| 5 | D. E. Shaw & Co., Inc. | $17.1M | 1.8M | ▲+4.9% Added · +82K sh | Q1 2026 | |
| 6 | ADAR1 Capital Management, LLC | $15.4M | 1.6M | ▲+8.5% Added · +124K sh | Q1 2026 | |
| 7 | VANGUARD PORTFOLIO MANAGEMENT LLC | $14.1M | 1.4M | ▲New +1.4M sh | Q1 2026 | |
| 8 | MORGAN STANLEY | $12.0M | 1.2M | ▼−1.3% Reduced · −16K sh | Q1 2026 | |
| 9 | Palo Alto Investors LP | $11.7M | 1.2M | ▼−8.5% Reduced · −112K sh | Q1 2026 | |
| 10 | TWO SIGMA INVESTMENTS, LP | $11.7M | 1.2M | ▲+80% Added · +536K sh | Q1 2026 | |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | $10.7M | 1.1M | ▲+3.3% Added · +35K sh | Q1 2026 | |
| 12 | FEDERATED HERMES, INC. | $10.3M | 1.1M | ▲+8.8% Added · +85K sh | Q1 2026 | |
| 13 | JACOBS LEVY EQUITY MANAGEMENT, INC | $9.4M | 972K | ▼−0.6% Reduced · −6K sh | Q1 2026 | |
| 14 | GOLDMAN SACHS GROUP INC | $8.0M | 819K | ▼−12% Reduced · −116K sh | Q1 2026 | |
| 15 | DIMENSIONAL FUND ADVISORS LP | $7.6M | 783K | ▲+0.9% Added · +7K sh | Q1 2026 | |
| 16 | Nuveen, LLC | $7.4M | 759K | ▲~0% Added · +261 sh | Q1 2026 | |
| 17 | Qube Research & Technologies Ltd | $6.0M | 615K | ▲+51% Added · +207K sh | Q1 2026 | |
| 18 | RENAISSANCE TECHNOLOGIES LLC | $5.9M | 608K | ▲+39% Added · +172K sh | Q1 2026 | |
| 19 | Mariner, LLC | $5.5M | 563K | ▼−2.6% Reduced · −15K sh | Q1 2026 | |
| 20 | MONIMUS CAPITAL MANAGEMENT, LP | $4.7M | 486K | ▲+91% Added · +231K sh | Q1 2026 | |
| 21 | VANGUARD CAPITAL MANAGEMENT LLC | $4.7M | 484K | ▲New +484K sh | Q1 2026 | |
| 22 | Rangeley Capital, LLC | $4.4M | 449K | ▼−14% Reduced · −75K sh | Q1 2026 | |
| 23 | Birchview Capital, LP | $4.4M | 449K | ▲+1.8% Added · +8K sh | Q1 2026 | |
| 24 | ARMISTICE CAPITAL, LLC | $4.3M | 439K | ▼−71% Reduced · −1.1M sh | Q1 2026 | |
| 25 | CITADEL ADVISORS LLC | $4.2M | 436K | ▼−52% Reduced · −477K 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 16, 2026 | SCULLY WILLIAM P | 10% Owner | Buy (P) | 20K | $158K |
| Jun 15, 2026 | SCULLY WILLIAM P | 10% Owner | Gift (G) | 325K | $0 |
| Jun 11, 2026 | SCULLY WILLIAM P | 10% Owner | Buy (P) | 125K | $1.0M |
| Jun 4, 2026 | SCULLY WILLIAM P | 10% Owner | Buy (P) | 50K | $465K |
| Jun 2, 2026 | SCULLY WILLIAM P | 10% Owner | Buy (P) | 50K | $471K |
| May 22, 2026 | SCULLY WILLIAM P | 10% Owner | Buy (P) | 100K | $981K |
| May 15, 2026 | Ekman Lars | Director | Grant (A) | 27K | $0 |
| May 15, 2026 | COLLIER RICHARD T | Director | Grant (A) | 27K | $0 |
| May 15, 2026 | Cooke Shane | Director | Grant (A) | 27K | $0 |
| May 15, 2026 | Dunn William H. Jr. | Director | Grant (A) | 27K | $0 |
| May 15, 2026 | Selkoe Dennis J. | Director | Grant (A) | 27K | $0 |
| May 15, 2026 | WELCH DANIEL G | Director | Grant (A) | 27K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 57 funds | $24.7B |
| BROADCOM INCAVGO | 57 funds | $14.4B |
| AMAZON.COM INCAMZN | 56 funds | $19.1B |
| META PLATFORMS INC-CLASS AMETA | 56 funds | $11.5B |
| ELI LILLY & COLLY | 56 funds | $6.0B |
| VISA INC-CLASS A SHARESV | 56 funds | $4.6B |
| COSTCO WHOLESALE CORPCOST | 56 funds | $4.4B |
| MICRON TECHNOLOGY INCMU | 55 funds | $6.8B |
| PALANTIR TECHNOLOGIES INC-APLTR | 55 funds | $3.6B |
| UNITEDHEALTH GROUP INCUNH | 55 funds | $2.8B |
| CITIGROUP INCC | 55 funds | $2.4B |
| BOSTON SCIENTIFIC CORPBSX | 55 funds | $2.2B |
Ranked by how many of PRTA'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 PRTA. 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.