Company · Ownership research

ALPHA PRO TECH LTD APT

CIK 0000884269 · CUSIP 020772109

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 020772109 (APT), not CUSIP 020772909 (APT), CUSIP 020772959 (APT), CUSIP 09258M101 (APT), and does not merge CUSIPs.

This page lists the top 20 of 36 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	VANGUARD GROUP INC CIK 102909 · View history	$3.30M 659,531 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ May 9, 2025	▾
02	NEEDHAM INVESTMENT MANAGEMENT LLC CIK 1167212 · View history	$3.06M 612,500 shares	0.29%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2025	▾
03	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$2.70M 539,559 shares	0.00%	-25.92K(-4.60%)Reduced	SEC filing ↗ May 14, 2025	▾
04	BlackRock, Inc. CIK 2012383 · View history	$1.36M 272,944 shares	0.00%	+48(0.00%)Added	SEC filing ↗ May 2, 2025	▾
05	Linden Thomas Advisory Services, LLC CIK 1965702 · View history	$938.05K 187,610 shares	0.12%	+27.46K(+17.10%)Added	SEC filing ↗ Apr 30, 2025	▾
06	ACADIAN ASSET MANAGEMENT LLC CIK 916542 · View history	$741.00K 148,573 shares	0.00%	-5.71K(-3.70%)Reduced	SEC filing ↗ May 21, 2025	▾
07	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$719.13K 143,825 shares	0.00%	+2.36K(+1.70%)Added	SEC filing ↗ May 13, 2025	▾
08	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$487.22K 97,411 shares	0.00%	+722(+0.70%)Added	SEC filing ↗ May 13, 2025	▾
09	BRIDGEWAY CAPITAL MANAGEMENT, LLC CIK 1107261 · View history	$385.13K 77,025 shares	0.01%	+1(0.00%)Added	SEC filing ↗ May 15, 2025	▾
10	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 1164508 · View history	$291.55K 58,309 shares	0.00%	-2.42K(-4.00%)Reduced	SEC filing ↗ May 14, 2025	▾
11	CITADEL ADVISORS LLC CIK 1423053 · View history	$274.57K 54,915 shares	0.00%	+25.49K(+86.60%)Added	SEC filing ↗ May 15, 2025	▾
12	STATE STREET CORP CIK 93751 · View history	$234.78K 46,957 shares	0.00%	-500(-1.10%)Reduced	SEC filing ↗ May 15, 2025	▾
13	ESSEX INVESTMENT MANAGEMENT CO LLC CIK 201772 · View history	$173.91K 34,782 shares	0.04%	-11(0.00%)Reduced	SEC filing ↗ May 7, 2025	▾
14	MORGAN STANLEY CIK 895421 · View history	$119.96K 23,992 shares	0.00%	+5.23K(+27.90%)Added	SEC filing ↗ May 15, 2025	▾
15	JANE STREET GROUP, LLC CIK 1595888 · Amended · View history	$116.57K 23,314 shares	0.00%	+23.31KNew	SEC filing ↗ May 19, 2025	▾
16	NORTHERN TRUST CORP CIK 73124 · View history	$112.53K 22,507 shares	0.00%	-383(-1.70%)Reduced	SEC filing ↗ May 13, 2025	▾
17	SUSQUEHANNA INTERNATIONAL GROUP, LLP CIK 1446194 · View history	$105.25K 21,049 shares	0.00%	+21.05KNew	SEC filing ↗ May 14, 2025	▾
18	OSAIC HOLDINGS, INC. CIK 1677044 · View history	$101.90K 20,380 shares	0.00%	+1.10K(+5.70%)Added	SEC filing ↗ May 12, 2025	▾
19	O'SHAUGHNESSY ASSET MANAGEMENT, LLC CIK 1423442 · View history	$94.00K 18,799 shares	0.00%	-32.76K(-63.50%)Reduced	SEC filing ↗ May 13, 2025	▾
20	CALDWELL SUTTER CAPITAL, INC. CIK 702007 · View history	$81.18K 16,236 shares	0.04%	0(0.00%)Unchanged	SEC filing ↗ Apr 16, 2025	▾

Showing 20 / 36 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

Cancelled or null records excluded

Disclosed shares

3,136,549

Not deduplicated across managers

Disclosed value

$15.68M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

ALPHA PRO TECH LTD · Q1 2025

Explore all 36 reporting institutions.

This page includes 20 of 36 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.