(MLAB)

Reporting relationship: Director
Issuer ticker: MLAB
Reported as of: 15 Aug 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 18 Aug 2025, 14:20:16 UTC
Prior SEC filing: 25 Nov 2024
Next SEC filing: 05 Dec 2025
Source filing: View source filing
Reporting owner signature: John Sakys under Power of Attorney by John Sullivan

Key filing fact

John James Sullivan filed Form 4 for MESA LABORATORIES INC /CO/ (MLAB) on 18 Aug 2025.

Key facts

This page summarizes John James Sullivan's Form 4 filing for MESA LABORATORIES INC /CO/ (MLAB).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 18 Aug 2025, 14:20.

Change

Previous filing in this sequence was filed on 25 Nov 2024.
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: 15 Aug 2025

Reported non-derivative transactions

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

MLAB transaction

Common Stock

Options Exercise

Transaction value: $0
Shares: +1,404
Change %: +5.4%
Price: $0.000000
Shares after: 27,282
Date: 15 Aug 2025
Ownership: Direct

MLAB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 44,780
Date: 15 Aug 2025
Ownership: By Trust
Footnotes: F5

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MLAB transaction Derivative

Restricted Stock Units - 9

Options Exercise

Transaction value: $0
Shares: -1,404
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 15 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,404
Exercise price
Footnotes: F1, F2, F3

MLAB transaction Derivative

Restricted Stock Units - 10

Award

Transaction value: $0
Shares: +2,784
Change %
Price: $0.000000
Shares after: 2,784
Date: 15 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,784
Exercise price
Footnotes: F1, F3, F4

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

Each RSU represents a contingent right to receive one share of the Issuer's common stock

Footnote F2

RSUs that vested on August 15, 2025

Footnote F3

Not Applicable

Footnote F4

RSUs that vest on August 15, 2026

Footnote F5

Represents shares held in a spousal lifetime access trust