Vault-13

ALPHA PRO TECH LTD APT

COM · Common Stock · CUSIP 020772109

41 institutional holders +4 vs Q1 2026
3,051,0713.1m shares reported held*
29.9% of all shares outstanding*
$17.1mreported value*
8 new 10 added 12 reduced 3 sold out net bought ≈ $46.0k (+8.2k shares)

* 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

0204060Q3 22: 37Q4 22: 36Q1 23: 31Q2 23: 31Q3 23: 30Q4 23: 37Q1 24: 40Q2 24: 38Q3 24: 35Q4 24: 31Q1 25: 36Q2 25: 36Q3 25: 40Q4 25: 35Q1 26: 37Q2 26: 4141Q3 22Q3 23Q3 24Q3 25Q2 26
Numbers
QuarterHolders
Q3 202237
Q4 202236
Q1 202331
Q2 202331
Q3 202330
Q4 202337
Q1 202440
Q2 202438
Q3 202435
Q4 202431
Q1 202536
Q2 202536
Q3 202540
Q4 202535
Q1 202637
Q2 202641

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
20020Q3 24: 9 bought or addedQ3 24: 20 cut or sold outQ4 24: 7 bought or addedQ4 24: 18 cut or sold outQ4 24Q1 25: 17 bought or addedQ1 25: 9 cut or sold outQ2 25: 10 bought or addedQ2 25: 15 cut or sold outQ2 25Q3 25: 16 bought or addedQ3 25: 14 cut or sold outQ4 25: 6 bought or addedQ4 25: 19 cut or sold outQ4 25Q1 26: 10 bought or addedQ1 26: 11 cut or sold outQ2 26: 18 bought or addedQ2 26: 15 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 2024920
Q4 2024718
Q1 2025179
Q2 20251015
Q3 20251614
Q4 2025619
Q1 20261011
Q2 20261815

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$2m$4m$6mQ3 25 calls: $1.3mQ3 25 puts: $1.1mQ3 25P/C 0.83Q4 25 calls: $1.2mQ4 25 puts: $712.2kQ4 25P/C 0.62Q1 26 calls: $2.3mQ1 26 puts: $2.8mQ1 26P/C 1.18Q2 26 calls: $4.3mQ2 26 puts: $2.3mQ2 26P/C 0.53
Numbers
QuarterCallsPutsP/C
Q3 2025$1.3m$1.1m0.83
Q4 2025$1.2m$712.2k0.62
Q1 2026$2.3m$2.8m1.18
Q2 2026$4.3m$2.3m0.53

Biggest buyers

SUSQUEHANNA INTERNATIONAL GROUP, LLP Added +101,473+101.5k
MARSHALL WACE, LLP New +52,113+52.1k
GEODE CAPITAL MANAGEMENT, LLC Added +28,467+28.5k
RENAISSANCE TECHNOLOGIES LLC Added +17,500+17.5k
SIMPLEX TRADING, LLC New +16,772+16.8k
BlackRock, Inc. Added +6,887+6.9k
UBS Group AG New +5,761+5.8k
NORTHERN TRUST CORP Added +2,623+2.6k
XTX Topco Ltd Added +2,500+2.5k
FMR LLC New +400+400

Biggest sellers

GROUP ONE TRADING LLC Reduced -110,992-111.0k
VANGUARD CAPITAL MANAGEMENT LLC Reduced -41,198-41.2k
CALDWELL SUTTER CAPITAL, INC. Sold out -16,236-16.2k
BRIDGEWAY CAPITAL MANAGEMENT, LLC Reduced -14,000-14.0k
Pinnacle Financial Partners, Inc. Reduced -12,600-12.6k
JANE STREET GROUP, LLC Reduced -12,583-12.6k
NewEdge Advisors, LLC Reduced -7,635-7.6k
ACADIAN ASSET MANAGEMENT LLC Reduced -6,486-6.5k
WELLS FARGO & COMPANY/MN Reduced -3,000-3.0k
OSAIC HOLDINGS, INC. Reduced -1,000-1.0k

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.

HolderStakeChangeShares Last filed
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% 1.3m≈ $7.2m 2025-02-12
NEEDHAM INVESTMENT MANAGEMENT LLC 13G · passive investor filed 2026-02-13 6.2% 642.5k≈ $3.6m 2026-02-13
VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-28 6.0% new 609.1k≈ $3.4m 2026-04-28

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)

BuyingSelling
202Q4 24: 0 buyingQ4 24: 0 sellingQ1 25: 0 buyingQ1 25: 1 sellingQ1 25Q2 25: 0 buyingQ2 25: 0 sellingQ3 25: 0 buyingQ3 25: 1 sellingQ3 25Q4 25: 0 buyingQ4 25: 1 sellingQ1 26: 0 buyingQ1 26: 1 sellingQ1 26Q2 26: 0 buyingQ2 26: 2 sellingQ3 26: 0 buyingQ3 26: 2 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20240—0——
Q1 20250—1$48.5k—
Q2 20250—0——
Q3 20250—1$45.7k—
Q4 20250—1$21.9k—
Q1 20260—1$34.1k—
Q2 20260—2$215.5k—
Q3 20260—2$145.7k—
DateInsiderTradeSharesPrice ValueTheir holding
2026-09-28 MONTGOMERY CHARLES D Director Sold 21,943 $5.04 $110.6k21.9k shares -46%
2026-09-28 Millar Donna Director Sold 6,971 $5.04 $35.1k7.0k shares -0%
2026-05-15 Garcia David R Director Sold 6,186 $5.56 $34.4k6.2k shares -24%
2026-05-14 Garcia David R Director Sold 4,900 $5.88 $28.8k4.9k shares -20%
2026-05-12 MONTGOMERY CHARLES D Director Sold 20,000 $6.25 $125.0k20.0k shares -25%
2026-05-11 MONTGOMERY CHARLES D Director Sold 3,886 $7.03 $27.3k3.9k shares -5%

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

#ManagerLocationShares Value% of their portfolioChangeShares change
1 NEEDHAM INVESTMENT MANAGEMENT LLC 0.11% of their portfolio NEW YORK, NY 642,500642.5k $3.6m $3.6m 0.11% Unchanged
2 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 561,572561.6k $3.2m $3.2m 0.00% Added +17.5k +17,500
3 VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio MALVERN, PA 512,476512.5k $2.9m $2.9m 0.00% Reduced -41.2k -41,198
4 BlackRock, Inc. 0.00% of their portfolio New York, NY 278,687278.7k $1.6m $1.6m 0.00% Added +6.9k +6,887
5 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 242,699242.7k $1.4m $1.4m 0.00% Added +101.5k +101,473
6 DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio AUSTIN, TX 137,103137.1k $770.5k $770.5k 0.00% Reduced -232 -232
7 ACADIAN ASSET MANAGEMENT LLC 0.00% of their portfolio Boston, MA 126,866126.9k $712.0k $712.0k 0.00% Reduced -6.5k -6,486
8 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 96,85396.9k $545.0k $545.0k 0.00% Added +28.5k +28,467
9 BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.01% of their portfolio HOUSTON, TX 64,52564.5k $362.6k $362.6k 0.01% Reduced -14.0k -14,000
10 ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.00% of their portfolio BOSTON, MA 58,30958.3k $327.7k $327.7k 0.00% Unchanged
11 MARSHALL WACE, LLP 0.00% of their portfolio LONDON, X0 52,11352.1k $292.9k $292.9k 0.00% New
12 VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio MALVERN, PA 51,78851.8k $291.0k $291.0k 0.00% Added +356 +356
13 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 46,95747.0k $263.9k $263.9k 0.00% Unchanged
14 ESSEX INVESTMENT MANAGEMENT CO LLC 0.03% of their portfolio BOSTON, MA 34,26434.3k $192.6k $192.6k 0.03% Reduced -111 -111
15 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 20,69720.7k $116.3k $116.3k 0.00% Added +2.6k +2,623
16 XTX Topco Ltd 0.00% of their portfolio LONDON, X0 17,21717.2k $96.8k $96.8k 0.00% Added +2.5k +2,500
17 SIMPLEX TRADING, LLC 0.00% of their portfolio CHICAGO, IL 16,77216.8k $94.3k $94.3k 0.00% New
18 PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio BALTIMORE, MD 16,00016.0k $90.0k $90.0k 0.00% Unchanged
19 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 13,04713.0k $73.3k $73.3k 0.00% Reduced -12.6k -12,583
20 Pinnacle Financial Partners, Inc. 0.00% of their portfolio ATLANTA, GA 12,40012.4k $69.7k $69.7k 0.00% Reduced -12.6k -12,600
21 NewEdge Advisors, LLC 0.00% of their portfolio NEW ORLEANS, LA 11,05611.1k $62.1k $62.1k 0.00% Reduced -7.6k -7,635
22 JAMES INVESTMENT RESEARCH, INC. 0.01% of their portfolio ALPHA, OH 11,05011.1k $62.1k $62.1k 0.01% Unchanged
23 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 8,0668.1k $45.3k $45.3k 0.00% Reduced -700 -700
24 UBS Group AG 0.00% of their portfolio ZURICH, V8 5,7615.8k $32.4k $32.4k 0.00% New
25 Vanguard Global Advisers, LLC 0.00% of their portfolio MALVERN, PA 3,9614.0k $22.3k $22.3k 0.00% Unchanged
26 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 3,7803.8k $21.2k $21.2k 0.00% Reduced -1.0k -1,000
27 GROUP ONE TRADING LLC 0.00% of their portfolio CHICAGO, IL 2,0792.1k $11.7k $11.7k 0.00% Reduced -111.0k -110,992
28 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 684684 $3.8k $3.8k 0.00% Added +42 +42
29 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 426426 $2.4k $2.4k 0.00% Unchanged
30 FMR LLC 0.00% of their portfolio BOSTON, MA 400400 $2.2k $2.2k 0.00% New
31 Farther Finance Advisors, LLC 0.00% of their portfolio SAN FRANCISCO, CA 363363 $2.0k $2.0k 0.00% Unchanged
32 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 252252 $1.4k $1.4k 0.00% Unchanged
33 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 131131 $727 $727 0.00% Added +91 +91
34 Archer Investment Corp 0.00% of their portfolio Carmel, IN 7878 $438 $438 0.00% Added +39 +39
35 NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO 0.00% of their portfolio MILWAUKEE, WI 5050 $281 $281 0.00% New
36 TD Waterhouse Canada Inc. 0.00% of their portfolio TORONTO, A6 4040 $230 $230 0.00% Unchanged
37 Caitong International Asset Management Co., Ltd 0.00% of their portfolio HONG KONG, K3 2222 $124 $124 0.00% New
38 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 1313 $73 $73 0.00% Unchanged
39 SIGNATUREFD, LLC 0.00% of their portfolio ATLANTA, GA 1010 $56 $56 0.00% New
40 CVA Family Office, LLC 0.00% of their portfolio DENVER, CO 33 $17 $17 0.00% New
41 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 11 $3 $3 0.00% Reduced -3.0k -3,000