176 tracked 13F filers disclose a position in PRTA as of the latest SEC 13F filings, a combined $442.1M 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 | 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 | $23.4M | 2.4M | ▲+23% Added · +455K sh | Q2 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 | →First observed position No prior filed position | Q1 2026 | |
| 8 | MORGAN STANLEY | $12.0M | 1.2M | ▼−1.3% Reduced · −16K sh | Q1 2026 | |
| 9 | TWO SIGMA INVESTMENTS, LP | $11.7M | 1.2M | ▲+80% Added · +536K sh | Q1 2026 | |
| 10 | Palo Alto Investors LP | $11.2M | 1.1M | ▼−5.4% Reduced · −65K sh | Q2 2026 | |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | $11.0M | 1.1M | ▲+2.5% Added · +28K sh | Q2 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 | Man Group plc | $6.6M | 678K | ▲+78% Added · +297K sh | Q2 2026 | |
| 18 | Qube Research & Technologies Ltd | $6.0M | 615K | ▲+51% Added · +207K sh | Q1 2026 | |
| 19 | RENAISSANCE TECHNOLOGIES LLC | $5.9M | 608K | ▲+39% Added · +172K sh | Q1 2026 | |
| 20 | Mariner, LLC | $5.5M | 563K | ▼−2.6% Reduced · −15K sh | Q1 2026 | |
| 21 | MONIMUS CAPITAL MANAGEMENT, LP | $4.7M | 486K | ▲+91% Added · +231K sh | Q1 2026 | |
| 22 | VANGUARD CAPITAL MANAGEMENT LLC | $4.7M | 484K | →First observed position No prior filed position | Q1 2026 | |
| 23 | Rangeley Capital, LLC | $4.4M | 449K | ▼−14% Reduced · −75K sh | Q1 2026 | |
| 24 | Birchview Capital, LP | $4.4M | 449K | —Held | Q2 2026 | |
| 25 | ARMISTICE CAPITAL, LLC | $4.3M | 439K | ▼−71% Reduced · −1.1M 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.
Last quarter, 2 funds opened a new position in PRTA and 30 added to an existing one, while 14 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 |
|---|---|---|
| MICROSOFT CORPMSFT | 95 funds | $145.4B |
| NVIDIA CORPNVDA | 94 funds | $215.1B |
| AMAZON.COM INCAMZN | 93 funds | $102.9B |
| META PLATFORMS INC-CLASS AMETA | 92 funds | $59.6B |
| ALPHABET INC-CL AGOOGL | 91 funds | $82.7B |
| ELI LILLY & COLLY | 91 funds | $39.3B |
| APPLE INCAAPL | 89 funds | $163.7B |
| MICRON TECHNOLOGY INCMU | 89 funds | $20.9B |
| BRISTOL-MYERS SQUIBB COBMY | 89 funds | $7.1B |
| COSTCO WHOLESALE CORPCOST | 88 funds | $20.5B |
| ORACLE CORPORCL | 88 funds | $9.9B |
| VISA INC-CLASS A SHARESV | 87 funds | $34.3B |
Ranked by how many of PRTA's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 20, 2026 | SCULLY WILLIAM P | 10% Owner | Buy (P) | 50K | $439K |
| Aug 7, 2026 | SCULLY WILLIAM P | 10% Owner | Buy (P) | 4K | $30K |
| Aug 7, 2026 | SCULLY WILLIAM P | 10% Owner | Buy (P) | 34K | $293K |
| Jul 29, 2026 | Isaacs Michael John | General Counsel & Company Sec. | Sell (S) | 8K | $71K |
| Jul 29, 2026 | Kingston Anne Evans | Chief Strategy Officer | Sell (S) | 8K | $65K |
| Jun 16, 2026 | SCULLY WILLIAM P | 10% Owner | Buy (P) | 20K | $158K |
| 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 6, 2025 | EcoR1 Capital, LLC | 10% Owner | Sell (S) | 2.0M | $15.2M |
| May 5, 2025 | EcoR1 Capital, LLC | 10% Owner | Sell (S) | 978K | $7.9M |
Connected entities for PRTA
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.
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.