Alpha Pro Tech, Ltd.
US ˙ NYSEAM ˙ US0207721095

SecurityAPT / Alpha Pro Tech, Ltd.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership137,335 shares
Latest Disclosed Value $ 609,767
Dimensional Fund Advisors Lp ownership in APT / Alpha Pro Tech, Ltd.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 137,335 shares of Alpha Pro Tech, Ltd. (US:APT) valued at $609,767 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 137,335 shares of Alpha Pro Tech, Ltd.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $733,369 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F ALPHA PRO TECH COM 020772109 137,335 0 0.00 610 0.00 0.0000
2026-02-12 2025-12-31 13F ALPHA PRO TECH COM 020772109 137,335 -10,530 -7.12 610 -13.86 0.0001
2025-11-12 2025-09-30 13F ALPHA PRO TECH COM 020772109 147,865 0 0.00 708 2.02 0.0002
2025-08-12 2025-06-30 13F ALPHA PRO TECH COM 020772109 147,865 4,040 2.81 693 -3.62 0.0002
2025-05-13 2025-03-31 13F ALPHA PRO TECH COM 020772109 143,825 2,358 1.67 719 -3.88 0.0002
2025-02-13 2024-12-31 13F ALPHA PRO TECH COM 020772109 141,467 1,109 0.79 748 -6.50 0.0002
2024-11-07 2024-09-30 13F ALPHA PRO TECH COM 020772109 140,358 15,340 12.27 800 16.45 0.0002
2024-08-09 2024-06-30 13F ALPHA PRO TECH COM 020772109 125,018 33,782 37.03 688 20.74 0.0002
2024-05-10 2024-03-31 13F ALPHA PRO TECH COM 020772109 91,236 12,694 16.16 569 37.11 0.0002
2024-02-07 2023-12-31 13F ALPHA PRO TECH COM 020772109 78,542 2,631 3.47 415 26.14 0.0001
2023-11-09 2023-09-30 13F ALPHA PRO TECH COM 020772109 75,911 0 0.00 329 8.94 0.0001
2023-08-09 2023-06-30 13F ALPHA PRO TECH COM 020772109 75,911 0 0.00 302 -4.13 0.0001
2023-05-12 2023-03-31 13F ALPHA PRO TECH COM 020772109 75,911 0 0.00 316 0.0001
2023-02-09 2022-12-31 13F ALPHA PRO TECH COM 020772109 75,911 8 0.01 0 -100.00 0.0001
2022-11-10 2022-09-30 13F ALPHA PRO TECH COM 020772109 75,903 0 0.00 307 -9.44 0.0001
2022-08-12 2022-06-30 13F ALPHA PRO TECH COM 020772109 75,903 0 0.00 339 6.27 0.0001
2022-05-13 2022-03-31 13F ALPHA PRO TECH COM 020772109 75,903 0 0.00 319 -29.58 0.0001
2022-02-09 2021-12-31 13F ALPHA PRO TECH COM 020772109 75,903 0 0.00 453 -11.35 0.0001
2021-11-12 2021-09-30 13F ALPHA PRO TECH COM 020772109 75,903 0 0.00 511 -21.38 0.0002
2021-08-12 2021-06-30 13F ALPHA PRO TECH COM 020772109 75,903 -1,800 -2.32 650 -14.25 0.0002
2021-05-14 2021-03-31 13F ALPHA PRO TECH COM 020772109 77,703 0 0.00 758 -12.47 0.0003
2021-03-08 2020-12-31 13F/A-2 ALPHA PRO TECH COM 020772109 77,703 0 0.00 866 -24.56 0.0003
2021-02-11 2020-12-31 13F ALPHA PRO TECH COM 020772109 77,703 0 866 312.7532
2020-11-12 2020-09-30 13F ALPHA PRO TECH COM 020772109 77,703 -135,257 -63.51 1,148 -69.54 0.0005
2020-08-13 2020-06-30 13F ALPHA PRO TECH COM 020772109 212,960 -7,400 -3.36 3,769 41.59 0.0017
2020-05-14 2020-03-31 13F ALPHA PRO TECH COM 020772109 220,360 0 0.00 2,662 252.12 0.0014
2020-02-14 2019-12-31 13F ALPHA PRO TECH COM 020772109 220,360 0 0.00 756 -4.91 0.0003
2019-11-12 2019-09-30 13F ALPHA PRO TECH COM 020772109 220,360 -4,132 -1.84 795 3.79 0.0003
2019-08-13 2019-06-30 13F ALPHA PRO TECH COM 020772109 224,492 0 0.00 766 -5.20 0.0003
2019-08-12 2019-03-31 13F/A-2 ALPHA PRO TECH COM 020772109 224,492 -11,841 -5.01 808 -7.87 0.0003
2019-05-10 2019-03-31 13F ALPHA PRO TECH COM 020772109 224,492 -11,841 808
2019-02-26 2018-12-31 13F/A-1 ALPHA PRO TECH COM 020772109 236,333 0 0.00 877 4.53 0.0004
2019-02-13 2018-12-31 13F ALPHA PRO TECH COM 020772109 236,333 0 877
2018-11-13 2018-09-30 13F ALPHA PRO TECH COM 020772109 236,333 0 0.00 839 5.93 0.0003
2018-08-10 2018-06-30 13F ALPHA PRO TECH COM 020772109 236,333 15,377 6.96 792 7.03 0.0003
2018-05-11 2018-03-31 13F ALPHA PRO TECH COM 020772109 220,956 0 0.00 740 -16.29 0.0003
2018-02-12 2017-12-31 13F ALPHA PRO TECH COM 020772109 220,956 16,800 8.23 884 12.47 0.0004
2017-11-13 2017-09-30 13F ALPHA PRO TECH COM 020772109 204,156 26,169 14.70 786 49.71 0.0003
2017-08-11 2017-06-30 13F ALPHA PRO TECH COM 020772109 177,987 0 0.00 525 7.36 0.0002
2017-05-12 2017-03-31 13F ALPHA PRO TECH COM 020772109 177,987 10,887 6.52 489 -16.41 0.0002
2017-02-09 2016-12-31 13F ALPHA PRO TECH COM 020772109 167,100 58,490 53.85 585 49.62 0.0003
2016-11-10 2016-09-30 13F ALPHA PRO TECH COM 020772109 108,610 31,781 41.37 391 124.71 0.0002
2016-08-09 2016-06-30 13F ALPHA PRO TECH COM 020772109 76,829 4,132 5.68 174 31.82 0.0001
2016-05-13 2016-03-31 13F ALPHA PRO TECH COM 020772109 72,697 0 0.00 132 3.94 0.0001
2016-02-10 2015-12-31 13F ALPHA PRO TECH COM 020772109 72,697 0 0.00 127 -12.41 0.0001
2015-11-13 2015-09-30 13F ALPHA PRO TECH COM 020772109 72,697 0 0.00 145 -11.04 0.0001
2015-08-14 2015-06-30 13F ALPHA PRO TECH COM 020772109 72,697 0 0.00 163 -1.21 0.0001
2015-05-14 2015-03-31 13F ALPHA PRO TECH COM 020772109 72,697 14,470 24.85 165 10.00 0.0001
2015-02-06 2014-12-31 13F ALPHA PRO TECH COM 020772109 58,227 23,515 67.74 150 32.74 0.0001
2014-11-13 2014-09-30 13F ALPHA PRO TECH COM 020772109 34,712 20,884 151.03 113 289.66 0.0001
2014-08-08 2014-06-30 13F ALPHA PRO TECH COM 020772109 13,828 9,359 209.42 29 190.00 0.0000
2014-05-14 2014-03-31 13F ALPHA PRO TECH COM 020772109 4,469 4,469 10 0.0000
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.