Comparable stake leader
AO Partners I, LP
SEC ownership of PRO DEX INC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000788920.
Disclosed value leader
AO Partners I, LP
Comparable rows
50/50
Latest evidence
21 May 2026
- Public ticker
- PDEX on Nasdaq
- Parsed ownership sources
- 13D/G, 3/4/5, and 13F
- Largest SEC-reported holder
- AO Partners I, LP
- Latest 13D/G holder
- AO Partners I, LP
- Latest parsed ownership date
- 21 May 2026
- Issuer CIK
- 0000788920
- Issuer location
- Irvine, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of PRO DEX INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
AO Partners I, LP
Disclosed value leader
AO Partners I, LP
Comparable rows
50/50
Latest evidence
21 May 2026
13D/G
3/4/5
13F
Lead comparable stake: 31%
13D/G row: AO Partners I, LP
Showing 1-8 of 50 holder rows.
Quick read
AO Partners I, LP leads the comparable SEC ownership view at 31%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens AO Partners I, LP's linked filing trail.
Comparable ownership
Top 5
AO Partners I, LP
31%
FARNAM STREET PARTNERS LP /MN
8.8%
Nicholas J. Swenson
31%
Raymond E. Cabillot
8.4%
Richard Lee van Kirk Jr.
2.7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| AO Partners I, LP |
13D/G
Swenson Nicholas John
|
31%
|
$66,046,145
1,017,817 shares
|
$0 | 02 Apr 2025 |
| FARNAM STREET PARTNERS LP /MN |
13D/G
CABILLOT RAYMOND E
|
8.8%
|
$18,544,718
285,787 shares
|
-$2,203,989 | 25 Mar 2025 |
| Nicholas J. Swenson |
3/4/5
Director, 10%+ Owner
|
31%
|
$31,375,625
1,024,343 shares
|
— | 20 Nov 2025 |
| Raymond E. Cabillot |
3/4/5
Director, 10%+ Owner
|
8.4%
|
$8,357,272
272,846 shares
|
— | 20 Nov 2025 |
| Richard Lee van Kirk Jr. |
3/4/5
Chief Executive Officer, Director
|
2.7%
|
$5,708,056
89,707 shares
|
-$626,248 | 21 May 2026 |
| Katrina Marie Kramer Philp |
3/4/5
Director
|
0.61%
|
$647,415
19,796 shares
|
— | 21 Nov 2025 |
| Alisha Charlton |
3/4/5
Chief Financial Officer
|
0.53%
|
$528,888
17,267 shares
|
— | 20 Nov 2025 |
| Angelita Rebamontan Domingo |
3/4/5
Director
|
0.47%
|
$531,377
15,465 shares
|
— | 22 Jan 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$626,248.
Buys
$0
Insiders: 0
Sells
$626,248
Insiders: 1
Net
-$626,248
Shares: -10,000
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 10,000
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 10,000 | $0 | $626,248 | -$626,248 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-9 of 9 reporting-owner rows connected to PRO DEX INC. Open a relationship link for the CIK-to-CIK filing trail.
Rows
9
Largest Forms 3/4/5 holder
Nicholas J. Swenson
Net 12M change
-$626,248
Latest report
21 May 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Nicholas J. Swenson | Director, 10%+ Owner | $31,375,625 | Mixed | 20 Nov 2025 | ||
| Raymond E. Cabillot | Director, 10%+ Owner | $8,357,272 | Mixed | 20 Nov 2025 | ||
| Haeg Peter O | 10%+ Owner | $5,756,044 | Mixed | 10 Sep 2021 | ||
| Richard Lee van Kirk Jr. | Chief Executive Officer, Director | $5,708,056 | -$626,248 | -9.9% | Filing P/S | 21 May 2026 |
| Katrina Marie Kramer Philp | Director | $647,415 | Mixed | 21 Nov 2025 | ||
| Angelita Rebamontan Domingo | Director | $531,377 | Mixed | 22 Jan 2026 | ||
| Alisha Charlton | Chief Financial Officer | $528,888 | Mixed | 20 Nov 2025 | ||
| William James Farrell III | Director | $217,473 | Mixed | 20 Nov 2025 | ||
| David C. Hovda | Director | $131,709 | Mixed | 20 Nov 2025 |
Recent insider transactions for PRO DEX INC
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Richard Lee van Kirk Jr. | PDEX | Common Stock | Sale | -4.4% | $257,438 | $62.36 | -4,128 | 89,707 | 22 May 2026 | Direct |
| Richard Lee van Kirk Jr. | PDEX | Common Stock | Sale | -5.89% | $368,810 | $62.81 | -5,872 | 93,835 | 21 May 2026 | Direct |
| Angelita Rebamontan Domingo | PDEX | Common Stock | Award | 0.12% | 18 | 15,465 | 22 Jan 2026 | Direct | ||
| Katrina Marie Kramer Philp | PDEX | Common Stock | Award | 15% | 2,200 | 16,896 | 21 Nov 2025 | By Spouse | ||
| Katrina Marie Kramer Philp | PDEX | Common Stock | Award | 45% | 900 | 2,900 | 21 Nov 2025 | Direct | ||
| Richard Lee van Kirk Jr. | PDEX | Common Stock | Tax liability | -0.07% | -72 | 99,707 | 20 Nov 2025 | Direct | ||
| Nicholas John Swenson | PDEX | Common Stock | Award | 1.04% | 1,000 | 97,613 | 20 Nov 2025 | Direct | ||
| Katrina Marie Kramer Philp | PDEX | Common Stock | Award | 100% | 1,000 | 2,000 | 20 Nov 2025 | Direct | ||
| David C. Hovda | PDEX | Common Stock | Award | 30.3% | 1,000 | 4,300 | 20 Nov 2025 | Direct | ||
| William James Farrell III | PDEX | Common Stock | Award | 100% | 1,000 | 2,000 | 20 Nov 2025 | Direct | ||
| Angelita Rebamontan Domingo | PDEX | Common Stock | Award | 6.92% | 1,000 | 15,447 | 20 Nov 2025 | Direct | ||
| Angelita Rebamontan Domingo | PDEX | Common Stock | Tax liability | -0.5% | -72 | 14,447 | 20 Nov 2025 | Direct | ||
| Alisha Charlton | PDEX | Common Stock | Award | -5.47% | -1,000 | 17,267 | 20 Nov 2025 | Direct | ||
| Alisha Charlton | PDEX | Common Stock | Tax liability | -0.44% | -72 | 16,267 | 20 Nov 2025 | Direct | ||
| Raymond E. Cabillot | PDEX | Common Stock | Award | 100% | 1,000 | 2,000 | 20 Nov 2025 | Direct | ||
| Angelita Rebamontan Domingo | PDEX | Common Stock | Award | 0.1% | 15 | 14,519 | 24 Jul 2025 | Direct |
* marks a reported price that did not pass the local price check.