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 PESI 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/PESI"
Use Arkolith to show who owns PESI, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | $12.5M | 1.2M | ▼−2.3% Reduced · −28K sh | Q1 2026 | |
| 2 | VANGUARD GROUP INC | $12.2M | 968K | ▲+3.4% Added · +32K sh | Q4 2025 | |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | $8.1M | 759K | ▲New +759K sh | Q1 2026 | |
| 4 | GEODE CAPITAL MANAGEMENT, LLC | $4.6M | 433K | ▲+2.3% Added · +10K sh | Q1 2026 | |
| 5 | HEARTLAND ADVISORS INC | $4.3M | 400K | —Held | Q1 2026 | |
| 6 | DIAMOND HILL CAPITAL MANAGEMENT INC | $3.8M | 356K | ▼−8.0% Reduced · −31K sh | Q1 2026 | |
| 7 | STATE STREET CORP | $3.6M | 336K | ▲+7.5% Added · +23K sh | Q1 2026 | |
| 8 | GROUP ONE TRADING LLC | $2.6M | 248K | ▲62× Added · +244K sh | Q1 2026 | |
| 9 | DIMENSIONAL FUND ADVISORS LP | $1.8M | 164K | ▼−0.6% Reduced · −1K sh | Q1 2026 | |
| 10 | GOLDMAN SACHS GROUP INC | $1.5M | 143K | ▲+98% Added · +71K sh | Q1 2026 | |
| 11 | NORTHERN TRUST CORP | $1.4M | 130K | ▲+4.9% Added · +6K sh | Q1 2026 | |
| 12 | VANGUARD FIDUCIARY TRUST CO | $1.3M | 119K | ▲New +119K sh | Q1 2026 | |
| 13 | VANGUARD PORTFOLIO MANAGEMENT LLC | $1.1M | 100K | ▲New +100K sh | Q1 2026 | |
| 14 | CITADEL ADVISORS LLC | $741K | 69K | ▲+92% Added · +33K sh | Q1 2026 | |
| 15 | D. E. Shaw & Co., Inc. | $673K | 63K | ▼−34% Reduced · −33K sh | Q1 2026 | |
| 16 | UBS Group AG | $664K | 62K | ▲+114% Added · +33K sh | Q1 2026 | |
| 17 | Squarepoint Ops LLC | $555K | 52K | ▲+41% Added · +15K sh | Q1 2026 | |
| 18 | BANK OF AMERICA CORP /DE/ | $483K | 45K | ▲+3.5% Added · +2K sh | Q1 2026 | |
| 19 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $466K | 44K | ▼−10% Reduced · −5K sh | Q1 2026 | |
| 20 | Bank of New York Mellon Corp | $432K | 40K | ▼−8.3% Reduced · −4K sh | Q1 2026 | |
| 21 | SIMPLEX TRADING, LLC | $335K | 31K | ▲New +31K sh | Q1 2026 | |
| 22 | JANE STREET GROUP, LLC | $305K | 29K | ▼−80% Reduced · −116K sh | Q1 2026 | |
| 23 | MORGAN STANLEY | $286K | 27K | ▼−60% Reduced · −40K sh | Q1 2026 | |
| 24 | XTX Topco Ltd | $248K | 23K | ▲New +23K sh | Q1 2026 | |
| 25 | Nuveen, LLC | $240K | 22K | —Held | 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 |
|---|---|---|---|---|---|
| Jan 20, 2026 | Grondin Richard | EVP of Hanford & Int. Waste Op | Option exercise (M) | 6K | $0 |
| Jan 20, 2026 | Grondin Richard | EVP of Hanford & Int. Waste Op | Tax withholding (F) | 2K | $24K |
| Jan 20, 2026 | Grondin Richard | EVP of Hanford & Int. Waste Op | Option exercise (M) | 6K | $24K |
| Jan 20, 2026 | Grondin Richard | EVP of Hanford & Int. Waste Op | Tax withholding (F) | 3K | $35K |
| Jan 20, 2026 | Grondin Richard | EVP of Hanford & Int. Waste Op | Option exercise (M) | 5K | $35K |
| Jan 20, 2026 | Grondin Richard | EVP of Hanford & Int. Waste Op | Option exercise (M) | 5K | $0 |
| Jan 2, 2026 | ZWECKER MARK A | Director | Grant (A) | 1K | $13K |
| Jan 2, 2026 | Shelton Larry | Director | Grant (A) | 2K | $15K |
| Jan 2, 2026 | Duggan Kerry C | Director | Grant (A) | 929 | $9K |
| Jan 2, 2026 | Grumski Joseph Timothy | Director | Grant (A) | 2K | $17K |
| Jan 2, 2026 | Bostick Thomas | Director | Grant (A) | 1K | $12K |
| Jan 2, 2026 | Wamp Zach Paul | Director | Grant (A) | 964 | $9K |
| Company | Co-held by | Combined value |
|---|---|---|
| AMAZON.COM INCAMZN | 20 funds | $5.5B |
| ALPHABET INC-CL AGOOGL | 20 funds | $4.5B |
| VISA INC-CLASS A SHARESV | 20 funds | $1.6B |
| ABBOTT LABORATORIESABT | 20 funds | $1.1B |
| CHEVRON CORPCVX | 20 funds | $1.1B |
| UNION PACIFIC CORPUNP | 20 funds | $684.0M |
| MICROSOFT CORPMSFT | 19 funds | $6.6B |
| META PLATFORMS INC-CLASS AMETA | 19 funds | $3.2B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 19 funds | $2.4B |
| JOHNSON & JOHNSONJNJ | 19 funds | $1.5B |
| SALESFORCE INCCRM | 19 funds | $1.1B |
| BLACKROCK INCBLK | 19 funds | $1.1B |
Ranked by how many of PESI'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 PESI. 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.