39 institutions reported holding $3.3M of PIONEER POWER SO (PPSI) in SEC 13F filings for 2026-03-31. Largest institutional holders: VANGUARD CAPITAL MANAGEMENT LLC ($637,445), Spectrum Investment Advisors, Inc. ($446,875), GEODE CAPITAL MANAGEMENT, LLC ($375,053), DIMENSIONAL FUND ADVISORS LP ($250,975), Squarepoint Ops LLC ($219,564). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | VANGUARD CAPITAL MANAGEMENT LLC | $637,445 | 196,137 | New |
| 2 | Spectrum Investment Advisors, Inc. | $446,875 | 137,500 | Hold |
| 3 | GEODE CAPITAL MANAGEMENT, LLC | $375,053 | 115,381 | Added |
| 4 | DIMENSIONAL FUND ADVISORS LP | $250,975 | 77,223 | Added |
| 5 | Squarepoint Ops LLC | $219,564 | 67,558 | New |
| 6 | RENAISSANCE TECHNOLOGIES LLC | $208,650 | 64,200 | Added |
| 7 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $180,671 | 55,591 | Added |
| 8 | VANGUARD FIDUCIARY TRUST CO | $115,674 | 35,592 | New |
| 9 | STATE STREET CORP | $110,591 | 34,028 | Hold |
| 10 | BlackRock, Inc. | $93,191 | 28,674 | Hold |
| 11 | JAMES INVESTMENT RESEARCH, INC. | $70,805 | 21,786 | Hold |
| 12 | XTX Topco Ltd | $70,636 | 21,734 | Added |
| 13 | Sage Capital Management, LLC | $68,250 | 21,000 | Hold |
| 14 | Stratos Wealth Advisors, LLC | $56,225 | 17,300 | Hold |
| 15 | CITADEL ADVISORS LLC | $53,300 | 16,400 | Trimmed |
| 16 | Legacy Advisors, LLC | $52,081 | 16,025 | Hold |
| 17 | MARSHALL WACE, LLP | $50,225 | 15,454 | New |
| 18 | NORTHERN TRUST CORP | $47,024 | 14,469 | Trimmed |
| 19 | GSA CAPITAL PARTNERS LLP | $44,000 | 13,388 | New |
| 20 | SMITH, MOORE & CO. | $42,250 | 13,000 | Hold |
| 21 | Rockefeller Capital Management L.P. | $32,500 | 10,000 | New |
| 22 | GROUP ONE TRADING LLC | $29,016 | 8,928 | Added |
| 23 | MORGAN STANLEY | $25,155 | 7,740 | Trimmed |
| 24 | NewEdge Advisors, LLC | $21,786 | 21,786 | Hold |
| 25 | Tower Research Capital LLC (TRC) | $6,120 | 1,883 | Added |
Source: SEC Form 13F filings · as of 2026-03-31