ALPHA PRO TECH LTD - APT
Detailed investor-level table based on 13F positions.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| CITADEL ADVISORS LLC | History | Added to | 785,300 | 3,486 | 0.0% | 0.0% | 1 | +550,449 | 234.38% | Q1 2026 | May 15, 2026 |
| NEEDHAM INVESTMENT MANAGEMENT LLC | History | No change | 642,500 | 2,852 | 0.15% | 0.18% | 2 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| VANGUARD GROUP INC | History | No change | 609,067 | 2,704 | 0.0% | 0.0% | 3 | 0 | 0.0% | Q4 2025 | Jan 29, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | History | New | 553,674 | 2,458 | 0.0% | — | 4 | +553,674 | New | Q1 2026 | May 15, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | Added to | 544,072 | 2,415 | 0.0% | 0.0% | 5 | +21,100 | 4.03% | Q1 2026 | May 14, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | History | Added to | 420,126 | 1,865 | 0.0% | 0.0% | 6 | +230,315 | 121.34% | Q1 2026 | May 15, 2026 |
| BlackRock, Inc. | History | Added to | 271,800 | 1,206 | 0.0% | 0.0% | 7 | +1,391 | 0.51% | Q1 2026 | May 13, 2026 |
| DIMENSIONAL FUND ADVISORS LP | History | No change | 137,335 | 609 | 0.0% | 0.0% | 8 | 0 | 0.0% | Q1 2026 | May 07, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | History | No change | 133,352 | 591 | 0.0% | 0.0% | 9 | 0 | 0.0% | Q1 2026 | May 13, 2026 |
| GROUP ONE TRADING LLC | History | Added to | 113,971 | 506 | 0.0% | 0.0% | 10 | +111,971 | 5598.55% | Q1 2026 | May 13, 2026 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | History | No change | 78,525 | 348 | 0.01% | 0.01% | 11 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Reduced | 68,386 | 304 | 0.0% | 0.0% | 12 | -24,486 | -26.37% | Q1 2026 | May 15, 2026 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | History | No change | 58,309 | 258 | 0.0% | 0.0% | 13 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| VANGUARD FIDUCIARY TRUST CO | History | New | 51,432 | 228 | 0.0% | — | 14 | +51,432 | New | Q1 2026 | May 08, 2026 |
| STATE STREET CORP | History | No change | 46,957 | 208 | 0.0% | 0.0% | 15 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| JANE STREET GROUP, LLC | History | Reduced | 40,130 | 178 | 0.0% | 0.0% | 16 | -29,570 | -42.42% | Q1 2026 | May 12, 2026 |
| ESSEX INVESTMENT MANAGEMENT CO LLC | History | No change | 34,375 | 152 | 0.02% | 0.02% | 17 | 0 | 0.0% | Q1 2026 | May 11, 2026 |
| Pinnacle Financial Partners, Inc. | History | No change | 25,000 | 111 | 0.0% | 0.0% | 18 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| NORTHERN TRUST CORP | History | No change | 18,074 | 80 | 0.0% | 0.0% | 19 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ | History | No change | 16,000 | 72 | 0.0% | 0.0% | 20 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| CALDWELL SUTTER CAPITAL, INC. | History | No change | 16,236 | 72 | 0.03% | 0.03% | 21 | 0 | 0.0% | Q1 2026 | May 05, 2026 |
| XTX Topco Ltd | History | New | 14,717 | 65 | 0.0% | — | 22 | +14,717 | New | Q1 2026 | May 15, 2026 |
| JAMES INVESTMENT RESEARCH, INC. | History | No change | 11,050 | 49 | 0.01% | 0.01% | 23 | 0 | 0.0% | Q1 2026 | Apr 24, 2026 |
| MORGAN STANLEY | History | No change | 8,766 | 38 | 0.0% | 0.0% | 24 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| OSAIC HOLDINGS, INC. | History | Reduced | 4,780 | 21 | 0.0% | 0.0% | 25 | -18,700 | -79.64% | Q1 2026 | May 15, 2026 |
| Vanguard Global Advisers, LLC | History | New | 3,961 | 17 | 0.0% | — | 26 | +3,961 | New | Q1 2026 | May 08, 2026 |
| WELLS FARGO & COMPANY/MN | History | Added to | 3,001 | 13 | 0.0% | 0.0% | 27 | +1 | 0.03% | Q1 2026 | May 11, 2026 |
| Tower Research Capital LLC (TRC) | History | Reduced | 642 | 2 | 0.0% | 0.0% | 28 | -504 | -43.98% | Q1 2026 | May 15, 2026 |
| Farther Finance Advisors, LLC | History | New | 363 | 1 | 0.0% | — | 31 | +363 | New | Q1 2026 | Apr 07, 2026 |
| SBI Securities Co., Ltd. | History | Added to | 252 | 1 | 0.0% | 0.0% | 30 | +1 | 0.4% | Q1 2026 | Apr 27, 2026 |
| BARCLAYS PLC | History | No change | 426 | 1 | 0.0% | 0.0% | 29 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| NewEdge Advisors, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -32,814 | -100.0% | Q1 2026 | May 15, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Closed out | 0 | 0 | — | 0.0% | — | -6,612 | -100.0% | Q1 2026 | May 15, 2026 |
| Federation des caisses Desjardins du Quebec | History | Closed out | 0 | 0 | — | 0.0% | — | -1,500 | -100.0% | Q1 2026 | May 13, 2026 |
| Garton & Associates Financial Advisors LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -1,000 | -100.0% | Q1 2026 | May 11, 2026 |
| JPMORGAN CHASE & CO | History | Reduced | 40 | 0 | — | 0.0% | — | -566 | -93.4% | Q1 2026 | May 13, 2026 |
| JONES FINANCIAL COMPANIES LLLP | History | New | 150 | 0 | — | — | — | +150 | New | Q1 2026 | May 15, 2026 |
| SIMPLEX TRADING, LLC | History | New | 100 | 0 | — | — | — | +100 | New | Q1 2026 | May 14, 2026 |
| CITIGROUP INC | History | Reduced | 1 | 0 | — | — | — | -75 | -98.68% | Q1 2026 | May 11, 2026 |
| UBS Group AG | History | Closed out | 0 | 0 | — | — | — | -11 | -100.0% | Q1 2026 | May 05, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | No change | 13 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 12, 2026 |
| CWM, LLC | History | No change | 100 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| Archer Investment Corp | History | No change | 39 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 04, 2026 |
| TD Waterhouse Canada Inc. | History | No change | 40 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 12, 2026 |