APT Alpha Pro Tech Ltd
Alpha Pro Tech Ltd (APT) Institutional Ownership
What the institutions did with APT last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| NEEDHAM INVESTMENT MANAGEMENT LLC | 642.5K | 21.1% |
| RENAISSANCE TECHNOLOGIES LLC | 561.6K | 18.4% |
| VANGUARD CAPITAL MANAGEMENT LLC | 512.5K | 16.8% |
| BlackRock, Inc. | 278.7K | 9.1% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 242.7K | 8.0% |
| DIMENSIONAL FUND ADVISORS LP | 137.1K | 4.5% |
| ACADIAN ASSET MANAGEMENT LLC | 126.9K | 4.2% |
| GEODE CAPITAL MANAGEMENT, LLC | 96.9K | 3.2% |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 64.5K | 2.1% |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 58.3K | 1.9% |
| MARSHALL WACE, LLP | 52.1K | 1.7% |
| VANGUARD FIDUCIARY TRUST CO | 51.8K | 1.7% |
| STATE STREET CORP | 47.0K | 1.5% |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 34.3K | 1.1% |
| NORTHERN TRUST CORP | 20.7K | 0.7% |
| XTX Topco Ltd | 17.2K | 0.6% |
| SIMPLEX TRADING, LLC | 16.8K | 0.5% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 16.0K | 0.5% |
| JANE STREET GROUP, LLC | 13.0K | 0.4% |
| Pinnacle Financial Partners, Inc. | 12.4K | 0.4% |
| NewEdge Advisors, LLC | 11.1K | 0.4% |
| JAMES INVESTMENT RESEARCH, INC. | 11.1K | 0.4% |
| MORGAN STANLEY | 8.1K | 0.3% |
| UBS Group AG | 5.8K | 0.2% |
| Vanguard Global Advisers, LLC | 4.0K | 0.1% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| GROUP ONE TRADING LLC | Reduced | 113.1K | 2.1K | -111.0K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 141.2K | 242.7K | +101.5K |
| MARSHALL WACE, LLP | New | 0 | 52.1K | +52.1K |
| VANGUARD CAPITAL MANAGEMENT LLC | Reduced | 553.7K | 512.5K | -41.2K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 68.4K | 96.9K | +28.5K |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 544.1K | 561.6K | +17.5K |
| SIMPLEX TRADING, LLC | New | 0 | 16.8K | +16.8K |
| CALDWELL SUTTER CAPITAL, INC. | Sold Out | 16.2K | 0 | -16.2K |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | Reduced | 78.5K | 64.5K | -14.0K |
| Pinnacle Financial Partners, Inc. | Reduced | 25.0K | 12.4K | -12.6K |
| JANE STREET GROUP, LLC | Reduced | 25.6K | 13.0K | -12.6K |
| NewEdge Advisors, LLC | Reduced | 18.7K | 11.1K | -7.6K |
| BlackRock, Inc. | Increased | 271.8K | 278.7K | +6.9K |
| ACADIAN ASSET MANAGEMENT LLC | Reduced | 133.4K | 126.9K | -6.5K |
| UBS Group AG | New | 0 | 5.8K | +5.8K |
| WELLS FARGO & COMPANY/MN | Reduced | 3.0K | 1 | -3.0K |
| NORTHERN TRUST CORP | Increased | 18.1K | 20.7K | +2.6K |
| XTX Topco Ltd | Increased | 14.7K | 17.2K | +2.5K |
| OSAIC HOLDINGS, INC. | Reduced | 4.8K | 3.8K | -1.0K |
| MORGAN STANLEY | Reduced | 8.8K | 8.1K | -700 |
| FMR LLC | New | 0 | 400 | +400 |
| VANGUARD FIDUCIARY TRUST CO | Increased | 51.4K | 51.8K | +356 |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 137.3K | 137.1K | -232 |
| JONES FINANCIAL COMPANIES LLLP | Sold Out | 150 | 0 | -150 |
| ESSEX INVESTMENT MANAGEMENT CO LLC | Reduced | 34.4K | 34.3K | -111 |
| JPMORGAN CHASE & CO | Increased | 40 | 131 | +91 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | New | 0 | 50 | +50 |
| Tower Research Capital LLC (TRC) | Increased | 642 | 684 | +42 |
| Archer Investment Corp | Increased | 39 | 78 | +39 |
| Caitong International Asset Management Co., Ltd | New | 0 | 22 | +22 |
| SIGNATUREFD, LLC | New | 0 | 10 | +10 |
| CVA Family Office, LLC | New | 0 | 3 | +3 |
| CITIGROUP INC | Sold Out | 1 | 0 | -1 |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.