(MLAB)

Reporting relationship: Director
Issuer ticker: MLAB
Reported as of: 13 Oct 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 29 Oct 2026, 18:35:37 UTC
Prior SEC filing: 11 Sep 2026
Source filing: View source filing
Reporting owner signature: John Sakys under Power of Attorney by John Sullivan

Filing notes and source

Key filing fact

John James Sullivan filed Form 4 for MESA LABORATORIES INC /CO/ (MLAB) on 29 Oct 2026.

Key facts

This page summarizes John James Sullivan's Form 4 filing for MESA LABORATORIES INC /CO/ (MLAB).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 29 Oct 2026, 18:35.

Change

Previous filing in this sequence was filed on 11 Sep 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001305784 Primary reporting owner

Sullivan John James

Relationship: Director
Address: 12100 W. 6TH AVENUE, LAKEWOOD
Signature: John Sakys under Power of Attorney by John Sullivan
Signature date: 29 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MLAB transaction

Common Stock

Gift

Transaction value
Shares: -1,200
Change %: -5.8%
Price: $0.000000^*
Shares after: 19,418
Date: 13 Oct 2026
Ownership: Direct

MLAB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 45,110
Date: 13 Oct 2026
Ownership: By Trust
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Represents shares held by the "Sullivan Family Trust" for which the reporting person's spouse serves as Trustee. The reporting person disclaims beneficial ownership of the securities held by the trust except to the extent of his pecuniary interest therein