ALPHA PRO TECH LTD APT
COM · Common Stock · CUSIP 020772109
- SectorHealth care
- IndustryOrthopedic, Prosthetic & Surgical Appliances & Supplies
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Shares outstanding: 10.2m as of 2026-08-03, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $5.62. Options: 5 managers hold calls ($4.3m notional), 4 hold puts ($2.3m).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 37 |
| Q4 2022 | 36 |
| Q1 2023 | 31 |
| Q2 2023 | 31 |
| Q3 2023 | 30 |
| Q4 2023 | 37 |
| Q1 2024 | 40 |
| Q2 2024 | 38 |
| Q3 2024 | 35 |
| Q4 2024 | 31 |
| Q1 2025 | 36 |
| Q2 2025 | 36 |
| Q3 2025 | 40 |
| Q4 2025 | 35 |
| Q1 2026 | 37 |
| Q2 2026 | 41 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 9 | 20 |
| Q4 2024 | 7 | 18 |
| Q1 2025 | 17 | 9 |
| Q2 2025 | 10 | 15 |
| Q3 2025 | 16 | 14 |
| Q4 2025 | 6 | 19 |
| Q1 2026 | 10 | 11 |
| Q2 2026 | 18 | 15 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $1.3m | $1.1m | 0.83 |
| Q4 2025 | $1.2m | $712.2k | 0.62 |
| Q1 2026 | $2.3m | $2.8m | 1.18 |
| Q2 2026 | $4.3m | $2.3m | 0.53 |
Biggest buyers
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | +101.5k |
| MARSHALL WACE, LLP | New | +52.1k |
| GEODE CAPITAL MANAGEMENT, LLC | Added | +28.5k |
| RENAISSANCE TECHNOLOGIES LLC | Added | +17.5k |
| SIMPLEX TRADING, LLC | New | +16.8k |
| BlackRock, Inc. | Added | +6.9k |
| UBS Group AG | New | +5.8k |
| NORTHERN TRUST CORP | Added | +2.6k |
| XTX Topco Ltd | Added | +2.5k |
| FMR LLC | New | +400 |
Biggest sellers
| GROUP ONE TRADING LLC | Reduced | -111.0k |
| VANGUARD CAPITAL MANAGEMENT LLC | Reduced | -41.2k |
| CALDWELL SUTTER CAPITAL, INC. | Sold out | -16.2k |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | Reduced | -14.0k |
| Pinnacle Financial Partners, Inc. | Reduced | -12.6k |
| JANE STREET GROUP, LLC | Reduced | -12.6k |
| NewEdge Advisors, LLC | Reduced | -7.6k |
| ACADIAN ASSET MANAGEMENT LLC | Reduced | -6.5k |
| WELLS FARGO & COMPANY/MN | Reduced | -3.0k |
| OSAIC HOLDINGS, INC. | Reduced | -1.0k |
Biggest calls
| CITADEL ADVISORS LLC | Added | $1.5m272.3k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $1.3m232.2k shares |
| GROUP ONE TRADING LLC | Added | $1.2m210.2k shares |
| SIMPLEX TRADING, LLC | Reduced | $206.8k36.8k shares |
| JANE STREET GROUP, LLC | Reduced | $79.2k14.1k shares |
Biggest puts
| CITADEL ADVISORS LLC | Reduced | $1.3m239.5k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $848.1k150.9k shares |
| SIMPLEX TRADING, LLC | Added | $66.9k11.9k shares |
| GROUP ONE TRADING LLC | Added | $21.4k3.8k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
Millar Donna
13D · may seek influence
filed 2025-02-12
Stated purposeThe Reporting Person acquired 1,380,921 Shares on December 13, 2018 upon settlement of the estate of her husband, the former President and Chairman of the Issuer. The Reporting Person serves on the Issuer's board of directors and, as a result, may be asked to vote on or discuss matters related to items (a) through (j) of Schedule 13D with representatives of the Issuer and others. Except as may be set forth herein, the Reporting Person has no current intention, plan or proposal with respect to items (a) through (j) of Item 4 of Schedule 13D. Full filing |
11.7% |
| NEEDHAM INVESTMENT MANAGEMENT LLC 13G · passive investor filed 2026-02-13 | 6.2% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-28 | 6.0% |
Fell to 5% or below in the last year: VANGUARD GROUP INC (0.0%, 2026-03-26; now reported by VANGUARD CAPITAL MANAGEMENT LLC)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 0 | — | 1 | $48.5k | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 0 | — | 1 | $45.7k | — |
| Q4 2025 | 0 | — | 1 | $21.9k | — |
| Q1 2026 | 0 | — | 1 | $34.1k | — |
| Q2 2026 | 0 | — | 2 | $215.5k | — |
| Q3 2026 | 0 | — | 2 | $145.7k | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-09-28 | MONTGOMERY CHARLES D Director | Sold | $110.6k21.9k shares |
| 2026-09-28 | Millar Donna Director | Sold | $35.1k7.0k shares |
| 2026-05-15 | Garcia David R Director | Sold | $34.4k6.2k shares |
| 2026-05-14 | Garcia David R Director | Sold | $28.8k4.9k shares |
| 2026-05-12 | MONTGOMERY CHARLES D Director | Sold | $125.0k20.0k shares |
| 2026-05-11 | MONTGOMERY CHARLES D Director | Sold | $27.3k3.9k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| NEEDHAM INVESTMENT MANAGEMENT LLC 0.11% of their portfolio | 642.5k $3.6m | Unchanged |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 561.6k $3.2m | Added +17.5k |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 512.5k $2.9m | Reduced -41.2k |
| BlackRock, Inc. 0.00% of their portfolio | 278.7k $1.6m | Added +6.9k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 242.7k $1.4m | Added +101.5k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 137.1k $770.5k | Reduced -232 |
| ACADIAN ASSET MANAGEMENT LLC 0.00% of their portfolio | 126.9k $712.0k | Reduced -6.5k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 96.9k $545.0k | Added +28.5k |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 64.5k $362.6k | Reduced -14.0k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.00% of their portfolio | 58.3k $327.7k | Unchanged |
| MARSHALL WACE, LLP 0.00% of their portfolio | 52.1k $292.9k | New |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 51.8k $291.0k | Added +356 |
| STATE STREET CORP 0.00% of their portfolio | 47.0k $263.9k | Unchanged |
| ESSEX INVESTMENT MANAGEMENT CO LLC 0.03% of their portfolio | 34.3k $192.6k | Reduced -111 |
| NORTHERN TRUST CORP 0.00% of their portfolio | 20.7k $116.3k | Added +2.6k |
| XTX Topco Ltd 0.00% of their portfolio | 17.2k $96.8k | Added +2.5k |
| SIMPLEX TRADING, LLC 0.00% of their portfolio | 16.8k $94.3k | New |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 16.0k $90.0k | Unchanged |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 13.0k $73.3k | Reduced -12.6k |
| Pinnacle Financial Partners, Inc. 0.00% of their portfolio | 12.4k $69.7k | Reduced -12.6k |
| NewEdge Advisors, LLC 0.00% of their portfolio | 11.1k $62.1k | Reduced -7.6k |
| JAMES INVESTMENT RESEARCH, INC. 0.01% of their portfolio | 11.1k $62.1k | Unchanged |
| MORGAN STANLEY 0.00% of their portfolio | 8.1k $45.3k | Reduced -700 |
| UBS Group AG 0.00% of their portfolio | 5.8k $32.4k | New |
| Vanguard Global Advisers, LLC 0.00% of their portfolio | 4.0k $22.3k | Unchanged |
| OSAIC HOLDINGS, INC. 0.00% of their portfolio | 3.8k $21.2k | Reduced -1.0k |
| GROUP ONE TRADING LLC 0.00% of their portfolio | 2.1k $11.7k | Reduced -111.0k |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 684 $3.8k | Added +42 |
| BARCLAYS PLC 0.00% of their portfolio | 426 $2.4k | Unchanged |
| FMR LLC 0.00% of their portfolio | 400 $2.2k | New |
| Farther Finance Advisors, LLC 0.00% of their portfolio | 363 $2.0k | Unchanged |
| SBI Securities Co., Ltd. 0.00% of their portfolio | 252 $1.4k | Unchanged |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 131 $727 | Added +91 |
| Archer Investment Corp 0.00% of their portfolio | 78 $438 | Added +39 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO 0.00% of their portfolio | 50 $281 | New |
| TD Waterhouse Canada Inc. 0.00% of their portfolio | 40 $230 | Unchanged |
| Caitong International Asset Management Co., Ltd 0.00% of their portfolio | 22 $124 | New |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 13 $73 | Unchanged |
| SIGNATUREFD, LLC 0.00% of their portfolio | 10 $56 | New |
| CVA Family Office, LLC 0.00% of their portfolio | 3 $17 | New |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 1 $3 | Reduced -3.0k |