Vault-13

PRO-DEX INC COLO PDEX

COM NEW · Common Stock · CUSIP 74265M205

67 institutional holders +9 vs Q1 2026
734,401734.4k shares reported held*
23.0% of all shares outstanding*
$43.0mreported value*
16 new 23 added 19 reduced 7 sold out net sold ≈ $854.2k (-14.6k 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: 3.2m as of 2026-04-28, 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 ≈ $58.54.

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0255075Q3 22: 22Q4 22: 23Q1 23: 23Q2 23: 24Q3 23: 22Q4 23: 25Q1 24: 25Q2 24: 26Q3 24: 25Q4 24: 43Q1 25: 43Q2 25: 53Q3 25: 57Q4 25: 56Q1 26: 58Q2 26: 6767Q3 22Q3 23Q3 24Q3 25Q2 26
Numbers
QuarterHolders
Q3 202222
Q4 202223
Q1 202323
Q2 202324
Q3 202322
Q4 202325
Q1 202425
Q2 202426
Q3 202425
Q4 202443
Q1 202543
Q2 202553
Q3 202557
Q4 202556
Q1 202658
Q2 202667

Buyers vs sellers

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

Bought or addedCut or sold out
40040Q3 24: 9 bought or addedQ3 24: 8 cut or sold outQ4 24: 26 bought or addedQ4 24: 9 cut or sold outQ4 24Q1 25: 24 bought or addedQ1 25: 22 cut or sold outQ2 25: 38 bought or addedQ2 25: 21 cut or sold outQ2 25Q3 25: 30 bought or addedQ3 25: 26 cut or sold outQ4 25: 22 bought or addedQ4 25: 27 cut or sold outQ4 25Q1 26: 21 bought or addedQ1 26: 26 cut or sold outQ2 26: 39 bought or addedQ2 26: 26 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 202498
Q4 2024269
Q1 20252422
Q2 20253821
Q3 20253026
Q4 20252227
Q1 20262126
Q2 20263926

Biggest buyers

Pekin Hardy Strauss, Inc. New +16,500+16.5k
JANE STREET GROUP, LLC New +13,638+13.6k
HRT FINANCIAL LP New +9,514+9.5k
GOLDMAN SACHS GROUP INC Added +8,570+8.6k
XTX Topco Ltd New +7,950+8.0k
NAVELLIER & ASSOCIATES INC New +5,496+5.5k
MARSHALL WACE, LLP New +5,156+5.2k
BAILARD, INC. New +4,955+5.0k
MILLENNIUM MANAGEMENT LLC New +4,777+4.8k
Nuveen, LLC Added +4,250+4.2k

Biggest sellers

NORTHERN TRUST CORP Reduced -31,076-31.1k
VANGUARD CAPITAL MANAGEMENT LLC Reduced -29,047-29.0k
Quadrature Capital Ltd Sold out -14,986-15.0k
PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. Reduced -9,000-9.0k
CITADEL ADVISORS LLC Sold out -8,986-9.0k
UBS Group AG Reduced -6,229-6.2k
MORGAN STANLEY Reduced -5,549-5.5k
OSAIC HOLDINGS, INC. Reduced -2,514-2.5k
STATE STREET CORP Reduced -1,804-1.8k
CITIGROUP INC Reduced -1,430-1.4k

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
Swenson Nicholas John 13D · may seek influence filed 2026-06-26
Stated purposeThe AO Partners Group acquired shares of Common Stock because it believes that the Common Stock is undervalued. The AO Partners Group's intent is to influence the policies of the Issuer and assert shareholder rights, with a goal of maximizing the value of the Common Stock. The Reporting Persons previously reported the transfer of shares of Common Stock to Groveland DST. This transfer was effected solely for tax and estate planning purposes, and for income tax purposes was a transfer between Mr. Swenson, individually, and an entity owned by Mr. Swenson. The Reporting Persons may make further purchases of shares of Common Stock. The Reporting Persons may dispose of any or all the shares of Common Stock held by them. To the extent the actions described herein may be deemed to constitute… Full filing
31.9% 1.0m≈ $59.6m 2026-06-26
AO Partners I, LP 13D · may seek influence filed 2025-04-04
Stated purposeThe AO Partners Group acquired shares of Common Stock because it believes that the Common Stock is undervalued. The AO Partners Group's intent is to influence the policies of the Issuer and assert shareholder rights, with a goal of maximizing the value of the Common Stock. The Reporting Persons previously reported the transfer of shares of Common Stock to Groveland DST. This transfer was effected solely for tax and estate planning purposes, and for income tax purposes was a transfer between Mr. Swenson, individually, and an entity owned by Mr. Swenson. The Reporting Persons may make further purchases of shares of Common Stock. The Reporting Persons may dispose of any or all the shares of Common Stock held by them. To the extent the actions described herein may be deemed to con… Full filing
31.2% 1.0m≈ $59.6m 2025-04-04
FARNAM STREET PARTNERS LP /MN 13D · may seek influence -1.0 pts · filed 2025-03-27
Stated purposeAll of the shares of the Company owned by the Farnam Fund were, at the time of their purchase, acquired for investment purposes in the ordinary course of business. Farnam Capital may from time to time purchase additional shares of the Company's stock or dispose of all or some of the shares. Except as noted in this Schedule 13D, none of the Reporting Persons has any plans or proposals, which relate to, or would result in, any of the matters referred to in paragraphs (b) through (j), inclusive of Item (4) of Schedule 13D. Mr. Cabillot, individually, beneficially owns the 6,000 shares of Common Stock issuable upon the exercise of options that are exercisable as of the date of this Schedule 13D/A; these stock options were granted to Mr. Cabillot for his service on the Board of Directors of th… Full filing
8.8% -1.0 pts 285.8k≈ $16.7m 2025-03-27

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: 1 sellingQ1 25: 0 buyingQ1 25: 1 sellingQ1 25Q2 25: 0 buyingQ2 25: 2 sellingQ3 25: 0 buyingQ3 25: 0 sellingQ3 25Q4 25: 0 buyingQ4 25: 0 sellingQ1 26: 0 buyingQ1 26: 1 sellingQ1 26Q2 26: 0 buyingQ2 26: 1 sellingQ3 26: 0 buyingQ3 26: 2 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20240—1$40.0k—
Q1 20250—1$3.8m$3.8m
Q2 20250—2$363.2k$363.2k
Q3 20250—0——
Q4 20250—0——
Q1 20260—1$47.1k—
Q2 20260—1$626.2k$626.2k
Q3 20260—2$1.4m$1.2m
DateInsiderTradeSharesPrice ValueTheir holding
2026-09-11 Van Kirk Richard Lee Jr Chief Executive Officer, director Sold plan 765 $59.36 $45.4k765 shares -1%
2026-09-09 Van Kirk Richard Lee Jr Chief Executive Officer, director Sold plan 19,235 $60.58 $1.2m19.2k shares -19%
2026-09-09 Charlton Alisha Chief Financial Officer Sold 2,300 $61.30 $141.0k2.3k shares -10%
2026-05-22 Van Kirk Richard Lee Jr Chief Executive Officer, director Sold plan 4,128 $62.36 $257.4k4.1k shares -4%
2026-05-21 Van Kirk Richard Lee Jr Chief Executive Officer, director Sold plan 5,872 $62.81 $368.8k5.9k shares -6%

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 BlackRock, Inc. 0.00% of their portfolio New York, NY 153,178153.2k $9.0m $9.0m 0.00% Added +663 +663
2 VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio MALVERN, PA 82,28382.3k $4.8m $4.8m 0.00% Reduced -29.0k -29,047
3 DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio AUSTIN, TX 57,06157.1k $3.3m $3.3m 0.00% Added +120 +120
4 PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. 0.15% of their portfolio EDINA, MN 52,73552.7k $3.1m $3.1m 0.15% Reduced -9.0k -9,000
5 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 49,63649.6k $2.9m $2.9m 0.00% Added +1.3k +1,289
6 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 32,28732.3k $1.9m $1.9m 0.00% Added +251 +251
7 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 31,31031.3k $1.8m $1.8m 0.00% Reduced -1.8k -1,804
8 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 18,71118.7k $1.1m $1.1m 0.00% Added +8.6k +8,570
9 Pekin Hardy Strauss, Inc. 0.09% of their portfolio CHICAGO, IL 16,50016.5k $966.1k $966.1k 0.09% New
10 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 15,94515.9k $933.6k $933.6k 0.00% Added +2.7k +2,711
11 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 15,61515.6k $914.3k $914.3k 0.00% Reduced -31.1k -31,076
12 VANGUARD PORTFOLIO MANAGEMENT LLC 0.00% of their portfolio MALVERN, PA 14,33214.3k $839.1k $839.1k 0.00% Added +1.9k +1,895
13 LPL Financial LLC 0.00% of their portfolio FORT MILL, SC 14,29714.3k $837.1k $837.1k 0.00% Added +1.2k +1,237
14 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 13,63813.6k $798.5k $798.5k 0.00% New
15 VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio MALVERN, PA 13,30013.3k $778.7k $778.7k 0.00% Added +232 +232
16 Bank of New York Mellon Corp 0.00% of their portfolio NEW YORK, NY 11,58711.6k $678.4k $678.4k 0.00% Added +528 +528
17 CORSAIR CAPITAL MANAGEMENT, L.P. 0.08% of their portfolio NEW YORK, NY 10,83510.8k $634.4k $634.4k 0.08% Unchanged
18 BARD ASSOCIATES INC 0.13% of their portfolio CHICAGO, IL 9,7999.8k $573.7k $573.7k 0.13% Reduced -767 -767
19 HRT FINANCIAL LP 0.00% of their portfolio NEW YORK, NY 9,5149.5k $557.0k $557.0k 0.00% New
20 Nuveen, LLC 0.00% of their portfolio CHARLOTTE, NC 9,2479.2k $541.4k $541.4k 0.00% Added +4.2k +4,250
21 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 9,0609.1k $530.5k $530.5k 0.00% Reduced -2.5k -2,514
22 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 8,6648.7k $507.3k $507.3k 0.00% Reduced -5.5k -5,549
23 XTX Topco Ltd 0.01% of their portfolio LONDON, X0 7,9508.0k $465.5k $465.5k 0.01% New
24 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio SAN FRANCISCO, CA 7,0817.1k $414.6k $414.6k 0.00% Added +588 +588
25 MORGAN DEMPSEY CAPITAL MANAGEMENT LLC 0.17% of their portfolio MILWAUKEE, WI 6,7166.7k $393.7k $393.7k 0.17% Added +908 +908
26 FIRST TRUST ADVISORS LP 0.00% of their portfolio Wheaton, IL 5,9345.9k $347.4k $347.4k 0.00% Added +225 +225
27 NAVELLIER & ASSOCIATES INC 0.03% of their portfolio Reno, NV 5,4965.5k $321.8k $321.8k 0.03% New
28 MARSHALL WACE, LLP 0.00% of their portfolio LONDON, X0 5,1565.2k $301.9k $301.9k 0.00% New
29 O'SHAUGHNESSY ASSET MANAGEMENT, LLC 0.00% of their portfolio Stamford, CT 5,0815.1k $297.5k $297.5k 0.00% Reduced -1.2k -1,245
30 BAILARD, INC. 0.01% of their portfolio Foster City, CA 4,9555.0k $290.1k $290.1k 0.01% New
31 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 4,7774.8k $279.7k $279.7k 0.00% New
32 UBS Group AG 0.00% of their portfolio ZURICH, V8 4,6324.6k $271.2k $271.2k 0.00% Reduced -6.2k -6,229
33 RITHOLTZ WEALTH MANAGEMENT 0.00% of their portfolio NEW YORK, NY 4,6204.6k $270.5k $270.5k 0.00% Reduced -784 -784
34 Greenhaven Road Investment Management, L.P. 0.14% of their portfolio GREENWICH, CT 3,5853.6k $209.9k $209.9k 0.14% New
35 Virtu Financial LLC 0.01% of their portfolio New York, NY 3,5163.5k $206.0k $206.0k 0.01% New
36 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 1,8911.9k $110.7k $110.7k 0.00% Added +1.1k +1,135
37 DEUTSCHE BANK AG\ 0.00% of their portfolio FRANKFURT AM MAIN, 2M 1,8311.8k $107.2k $107.2k 0.00% Added +17 +17
38 RHUMBLINE ADVISERS 0.00% of their portfolio BOSTON, MA 1,5021.5k $87.9k $87.9k 0.00% Added +97 +97
39 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 1,3101.3k $77.0k $77.0k 0.00% Reduced -132 -132
40 NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio ALBANY, NY 1,0901.1k $63.8k $63.8k 0.00% Reduced -810 -810
41 Vanguard Global Advisers, LLC 0.00% of their portfolio MALVERN, PA 1,0241.0k $60.0k $60.0k 0.00% Unchanged
42 Global Retirement Partners, LLC 0.00% of their portfolio San Rafael, CA 1,0001.0k $58.5k $58.5k 0.00% First filing
43 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 973973 $57.0k $57.0k 0.00% Reduced -1.4k -1,430
44 MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.00% of their portfolio CAUSEWAY BAY, K3 955955 $55.9k $55.9k 0.00% Reduced -41 -41
45 Russell Investments Group, Ltd. 0.00% of their portfolio Seattle, WA 725725 $42.4k $42.4k 0.00% Added +445 +445
46 Police & Firemen's Retirement System of New Jersey 0.00% of their portfolio TRENTON, NJ 637637 $37.3k $37.3k 0.00% Unchanged
47 Lavaca Capital LLC 0.00% of their portfolio HOUSTON, TX 353353 $20.7k $20.7k 0.00% New
48 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 350350 $20.5k $20.5k 0.00% Reduced -274 -274
49 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 305305 $17.9k $17.9k 0.00% Reduced -19 -19
50 ACADIAN ASSET MANAGEMENT LLC 0.00% of their portfolio Boston, MA 259259 $15.0k $15.0k 0.00% New
51 FMR LLC 0.00% of their portfolio BOSTON, MA 256256 $15.0k $15.0k 0.00% Added +14 +14
52 Ameritas Investment Partners, Inc. 0.00% of their portfolio LINCOLN, NE 216216 $12.6k $12.6k 0.00% Unchanged
53 Arax Advisory Partners 0.00% of their portfolio NEW YORK, NY 211211 $12.4k $12.4k 0.00% New
54 Legal & General Group Plc 0.00% of their portfolio London, X0 192192 $11.2k $11.2k 0.00% Unchanged
55 HARBOUR INVESTMENTS, INC. 0.00% of their portfolio MADISON, WI 100100 $5.9k $5.9k 0.00% Reduced -100 -100
56 Hurley Capital, LLC 0.00% of their portfolio NEW YORK, NY 6060 $3.5k $3.5k 0.00% Unchanged
57 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio WEST SACRAMENTO, CA 2929 $1.7k $1.7k 0.00% New
58 PNC Financial Services Group, Inc. 0.00% of their portfolio Pittsburgh, PA 2626 $1.5k $1.5k 0.00% Added +16 +16
59 GAMMA Investing LLC 0.00% of their portfolio FOSTER CITY, CA 1818 $1.1k $1.1k 0.00% Unchanged
60 Integrated Wealth Concepts LLC 0.00% of their portfolio WALTHAM, MA 1616 $937 $937 0.00% New
61 Farther Finance Advisors, LLC 0.00% of their portfolio SAN FRANCISCO, CA 1111 $644 $644 0.00% Reduced -140 -140
62 Sterling Capital Management LLC 0.00% of their portfolio CHARLOTTE, NC 77 $410 $410 0.00% Reduced -6 -6
63 Essential Partners LLC 0.00% of their portfolio RANCHO SANTA FE, CA 77 $410 $410 0.00% Added +3 +3
64 Allworth Financial LP 0.00% of their portfolio FOLSOM, CA 66 $352 $352 0.00% Added +4 +4
65 SJS Investment Consulting Inc. 0.00% of their portfolio SYLVANIA, OH 44 $235 $235 0.00% New
66 EverSource Wealth Advisors, LLC 0.00% of their portfolio BIRMINGHAM, AL 33 $176 $176 0.00% Added +2 +2
67 True Wealth Design, LLC 0.00% of their portfolio AKRON, OH 11 $59 $59 0.00% Unchanged