35 institutions reported holding $6.4M of Flexible Solutions International Inc (FSI) in SEC 13F filings for 2026-03-31. Largest institutional holders: RENAISSANCE TECHNOLOGIES LLC ($1.8M), VANGUARD CAPITAL MANAGEMENT LLC ($1.5M), DIMENSIONAL FUND ADVISORS LP ($498,359), North Star Investment Management Corp. ($486,045), Beartown Capital Management, LLC ($403,709). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | RENAISSANCE TECHNOLOGIES LLC | $1.8M | 340,945 | Added |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | $1.5M | 278,155 | New |
| 3 | DIMENSIONAL FUND ADVISORS LP | $498,359 | 92,280 | Added |
| 4 | North Star Investment Management Corp. | $486,045 | 90,000 | New |
| 5 | Beartown Capital Management, LLC | $403,709 | 74,754 | Hold |
| 6 | Regal Investment Advisors LLC | $233,221 | 43,185 | Added |
| 7 | CITADEL ADVISORS LLC | $201,098 | 37,237 | Added |
| 8 | ESSEX INVESTMENT MANAGEMENT CO LLC | $141,774 | 26,252 | Hold |
| 9 | Crestwood Advisors Group, LLC | $135,990 | 25,181 | New |
| 10 | Quantinno Capital Management LP | $135,990 | 25,181 | New |
| 11 | O'SHAUGHNESSY ASSET MANAGEMENT, LLC | $116,046 | 21,488 | Trimmed |
| 12 | BlackRock, Inc. | $106,822 | 19,780 | Added |
| 13 | Rothschild Wealth LLC | $100,989 | 18,700 | Trimmed |
| 14 | JAMES INVESTMENT RESEARCH, INC. | $98,829 | 18,300 | Hold |
| 15 | Strait & Sound Wealth Management LLC | $76,838 | 14,228 | Added |
| 16 | RITHOLTZ WEALTH MANAGEMENT | $74,986 | 13,885 | Trimmed |
| 17 | XTX Topco Ltd | $71,071 | 13,160 | Added |
| 18 | TWO SIGMA INVESTMENTS, LP | $59,946 | 11,100 | New |
| 19 | VANGUARD FIDUCIARY TRUST CO | $36,262 | 6,714 | New |
| 20 | Covestor Ltd | $33,000 | 6,162 | Hold |
| 21 | Founders Capital Management | $32,403 | 6,000 | Added |
| 22 | Federation des caisses Desjardins du Quebec | $12,726 | 2,525 | Hold |
| 23 | MORGAN STANLEY | $8,101 | 1,500 | New |
| 24 | WELLS FARGO & COMPANY/MN | $6,724 | 1,245 | Hold |
| 25 | Tower Research Capital LLC (TRC) | $4,337 | 803 | Added |
Source: SEC Form 13F filings · as of 2026-03-31