43 institutions reported holding $18.5M of ALPHA PRO (APT) in SEC 13F filings for 2026-03-31. Largest institutional holders: CITADEL ADVISORS LLC ($3.5M), NEEDHAM INVESTMENT MANAGEMENT LLC ($2.9M), VANGUARD CAPITAL MANAGEMENT LLC ($2.5M), RENAISSANCE TECHNOLOGIES LLC ($2.4M), SUSQUEHANNA INTERNATIONAL GROUP, LLP ($1.9M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | CITADEL ADVISORS LLC | $3.5M | 785,300 | Added |
| 2 | NEEDHAM INVESTMENT MANAGEMENT LLC | $2.9M | 642,500 | Hold |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | $2.5M | 553,674 | New |
| 4 | RENAISSANCE TECHNOLOGIES LLC | $2.4M | 544,072 | Added |
| 5 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1.9M | 420,126 | Added |
| 6 | BlackRock, Inc. | $1.2M | 271,800 | Added |
| 7 | GROUP ONE TRADING LLC | $641,007 | 144,371 | Added |
| 8 | DIMENSIONAL FUND ADVISORS LP | $609,767 | 137,335 | Hold |
| 9 | ACADIAN ASSET MANAGEMENT LLC | $591,000 | 133,352 | Hold |
| 10 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $348,651 | 78,525 | Hold |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | $304,142 | 68,386 | Trimmed |
| 12 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $258,892 | 58,309 | Hold |
| 13 | VANGUARD FIDUCIARY TRUST CO | $228,358 | 51,432 | New |
| 14 | STATE STREET CORP | $208,489 | 46,957 | Hold |
| 15 | JANE STREET GROUP, LLC | $178,176 | 40,130 | Trimmed |
| 16 | SIMPLEX TRADING, LLC | $173,160 | 39,000 | Added |
| 17 | ESSEX INVESTMENT MANAGEMENT CO LLC | $152,625 | 34,375 | Hold |
| 18 | Pinnacle Financial Partners, Inc. | $111,000 | 25,000 | Hold |
| 19 | NORTHERN TRUST CORP | $80,249 | 18,074 | Hold |
| 20 | CALDWELL SUTTER CAPITAL, INC. | $72,088 | 16,236 | Hold |
| 21 | PRICE T ROWE ASSOCIATES INC /MD/ | $72,000 | 16,000 | Hold |
| 22 | XTX Topco Ltd | $65,343 | 14,717 | New |
| 23 | JAMES INVESTMENT RESEARCH, INC. | $49,062 | 11,050 | Hold |
| 24 | MORGAN STANLEY | $38,921 | 8,766 | Hold |
| 25 | OSAIC HOLDINGS, INC. | $21,223 | 4,780 | Trimmed |
Source: SEC Form 13F filings · as of 2026-03-31