APT · Alpha Pro Tech Ltd

$5.25 -0.01 (-0.19%) At close · Sep 2

Market Cap

$53.58M

10.21M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Quarter:

Holders: 42

Total Value: $22,255,356

Total Shares: 3,960,032

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 42 13F filers · Δ vs Mar 31, 2026

Top Holder

16.2%

−2.8 pts

Top 5

72.1%

+0.6 pts

Top 10

89.9%

+0.6 pts

HHI

1,138

Broadly held−13

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +4

Institutional value: +21.6%

Shares held: -3.9%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	+205,673	625,799
Mega GEODE CAPITAL MANAGEMENT, LLC	+28,467	96,853
Large RENAISSANCE TECHNOLOGIES LLC	+17,500	561,572
Mega BlackRock, Inc.	+6,887	278,687
Mega NORTHERN TRUST CORP	+2,623	20,697

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mega CITADEL ADVISORS LLC	−273,500	511,800
Mid GROUP ONE TRADING LLC	−110,992	2,079
Mega VANGUARD CAPITAL MANAGEMENT LLC	−41,198	512,476
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC	−14,000	64,525
Mega JANE STREET GROUP, LLC	−12,983	27,147

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Large MARSHALL WACE, LLP	52,113	$292,874
Mid SIMPLEX TRADING, LLC	16,772	$94,258
Mega UBS Group AG	5,761	$32,376
Mega FMR LLC	400	$2,248
Large NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO	50	$281

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Small CALDWELL SUTTER CAPITAL, INC.	16,236	$72,087
Large JONES FINANCIAL COMPANIES LLLP	150	$666
Large CWM, LLC	100	$444
Mega CITIGROUP INC	1	$4

Filter: New 8 Increased 9 Reduced 13 Sold out 4 Unchanged 12

Showing 46 of 46

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

NEEDHAM INVESTMENT MANAGEMENT LLC

$3,610,850

16.22%

642,500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Needham Aggressive Growth Fund	642,500	$3,610,850	100.0%	Defined

RENAISSANCE TECHNOLOGIES LLC

$3,156,034

14.18%

561,572

VANGUARD CAPITAL MANAGEMENT LLC

$2,880,115

12.94%

512,476

BlackRock, Inc.

$1,566,219

7.04%

278,687

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	44,060	$247,617	15.8%	Sole
BlackRock Investment Management, LLC	2,098	$11,790	0.8%	Sole
BlackRock Fund Advisors	29,567	$166,166	10.6%	Sole
BlackRock Institutional Trust Company, N.A.	202,962	$1,140,646	72.8%	Sole

CITADEL ADVISORS LLC

$1,530,326

6.88%

272,300

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	272,300	$1,530,326	100.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$1,363,968

6.13%

242,699

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	242,699	$1,363,968	100.0%	Other

CITADEL ADVISORS LLC

$1,345,990

6.05%

239,500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	239,500	$1,345,990	100.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$1,304,964

5.86%

232,200

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	232,200	$1,304,964	100.0%	Other

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$848,058

3.81%

150,900

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	150,900	$848,058	100.0%	Other

DIMENSIONAL FUND ADVISORS LP

$770,517

3.46%

137,103

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
DFA Australia Ltd.	1,717	$9,649	1.3%	Defined
Dimensional Ireland Ltd	10,137	$56,969	7.4%	Defined
Held directly	125,249	$703,899	91.4%	Sole

ACADIAN ASSET MANAGEMENT LLC

$712,986

3.20%

126,866

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Acadian Inc	126,866	$712,986	100.0%	Defined

GEODE CAPITAL MANAGEMENT, LLC

$544,313

2.45%

96,853

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	20,134	$113,153	20.8%	Defined
Held directly	76,719	$431,160	79.2%	Defined

BRIDGEWAY CAPITAL MANAGEMENT, LLC

$362,630

1.63%

64,525

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

$327,696

1.47%

58,309

MARSHALL WACE, LLP

$292,874

1.32%

52,113

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Marshall Wace North America L.P. joint	52,113	$292,874	100.0%	Other

VANGUARD FIDUCIARY TRUST CO

$291,048

1.31%

51,788

STATE STREET CORP

$263,898

1.19%

46,957

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS TRUST COMPANY	46,957	$263,898	100.0%	Defined

ESSEX INVESTMENT MANAGEMENT CO LLC

$192,563

0.87%

34,264

NORTHERN TRUST CORP

$116,317

0.52%

20,697

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	20,697	$116,317	100.0%	Defined

XTX Topco Ltd

$96,759

0.43%

17,217

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	17,217	$96,759	100.0%	Defined

SIMPLEX TRADING, LLC

$94,258

0.42%

16,772

PRICE T ROWE ASSOCIATES INC /MD/

$89,920

0.40%

16,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
T. Rowe Price International Ltd	16,000	$89,920	100.0%	Defined

JANE STREET GROUP, LLC

$79,242

0.36%

14,100

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	14,100	$79,242	100.0%	Defined

JANE STREET GROUP, LLC

$73,323

0.33%

13,047

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	9,727	$54,665	74.6%	Defined
Jane Street Global Trading, LLC	3,320	$18,658	25.4%	Defined

Pinnacle Financial Partners, Inc.

$69,688

0.31%

12,400

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SYNOVUS TRUST CO NA	12,400	$69,688	100.0%	Defined

NewEdge Advisors, LLC

$62,134

0.28%

11,056

JAMES INVESTMENT RESEARCH, INC.

$62,101

0.28%

11,050

MORGAN STANLEY

$45,329

0.20%

8,066

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY CAPITAL SERVICES, LLC	1,732	$9,733	21.5%	Defined
MORGAN STANLEY SMITH BARNEY LLC	6,334	$35,596	78.5%	Defined

UBS Group AG

$32,376

0.15%

5,761

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Switzerland AG	1,512	$8,497	26.2%	Defined
UBS Securities LLC	4,249	$23,879	73.8%	Defined

Vanguard Global Advisers, LLC

$22,260

0.10%

3,961

OSAIC HOLDINGS, INC.

$21,243

0.10%

3,780

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	3,780	$21,243	100.0%	Defined

GROUP ONE TRADING LLC

$11,683

0.05%

2,079

Tower Research Capital LLC (TRC)

$3,844

0.02%

684

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	684	$3,844	100.0%	Defined

BARCLAYS PLC

$2,394

0.01%

426

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS BANK PLC	426	$2,394	100.0%	Defined

FMR LLC

$2,248

0.01%

400

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STRATEGIC ADVISERS LLC	400	$2,248	100.0%	Defined

Farther Finance Advisors, LLC

$2,040

0.01%

363

SBI Securities Co., Ltd.

$1,416

0.01%

252

JPMORGAN CHASE & CO

$735

0.00%

131

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JPMorgan Chase Bank, N.A.	91	$511	69.5%	Defined
J.P. Morgan Securities plc	40	$224	30.5%	Defined

NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO

$281

0.00%

TD Waterhouse Canada Inc.

$224

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TORONTO DOMINION BANK	40	$224	100.0%	Defined

Archer Investment Corp

$219

0.00%

Caitong International Asset Management Co., Ltd

$123

0.00%

BNP PARIBAS ARBITRAGE, SA

$73

0.00%

SIGNATUREFD, LLC

$56

0.00%

CVA Family Office, LLC

$16

0.00%

WELLS FARGO & COMPANY/MN

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO CLEARING SERVICES, LLC	1	$5	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Edward D. Jones & Co., L.P.	150	$666	100.0%	Sole

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	1	$4	100.0%	Defined

Key facts CIK 884269 CUSIP 020772109 13F (30d) 37 filings 37 filers Visit website Investor relations