(MLAB)

Reporting relationship: CFO
Issuer ticker: MLAB
Reported as of: 18 Jun 2026
Net transaction value: -$253,022
SEC form: 4
Accepted by SEC: 23 Jun 2026, 12:23:10 UTC
Prior SEC filing: 17 Jun 2026
Source filing: View source filing
Reporting owner signature: John Sakys

Key filing fact

John Sakys filed Form 4 for MESA LABORATORIES INC /CO/ (MLAB) on 23 Jun 2026.

Key facts

This page summarizes John Sakys's Form 4 filing for MESA LABORATORIES INC /CO/ (MLAB).
6 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 23 Jun 2026, 12:23.

Change

Previous filing in this sequence was filed on 17 Jun 2026.
Current net transaction value: -$253,022.

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 0001197710 Primary reporting owner

Sakys John

Relationship: CFO
Address: MESA LABORATORIES, INC., 12100 W. 6TH AVENUE, LAKEWOOD
Signature: John Sakys
Signature date: 23 Jun 2026

Reported non-derivative transactions

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

MLAB transaction

Common Stock

Options Exercise

Transaction value
Shares: +1,036
Change %: +6.3%
Price: $95.10^*
Shares after: 17,574
Date: 18 Jun 2026
Ownership: Direct

MLAB transaction

Common Stock

Options Exercise

Transaction value
Shares: +2,756
Change %: +16%
Price: $95.10^*
Shares after: 20,330
Date: 18 Jun 2026
Ownership: Direct

MLAB transaction

Common Stock

Award

Transaction value
Shares: +2,282
Change %: +11%
Price: $95.10^*
Shares after: 22,612
Date: 18 Jun 2026
Ownership: Direct
Footnotes: F5

MLAB transaction

Common Stock

Sale

Transaction value: $253,022
Shares: -2,827
Change %: -13%
Price: $89.50
Shares after: 19,785
Date: 22 Jun 2026
Ownership: Direct
Footnotes: F6

MLAB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 50
Date: 18 Jun 2026
Ownership: Custodian
Footnotes: F7

Reported derivative securities

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

MLAB transaction Derivative

Restricted Stock Units - 6

Options Exercise

Transaction value
Shares: -1,036
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 18 Jun 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,036
Exercise price
Footnotes: F1, F2, F3

MLAB transaction Derivative

Restricted Stock Units - 7

Options Exercise

Transaction value
Shares: -2,756
Change %: -50%
Price: $0.000000^*
Shares after: 2,755
Date: 18 Jun 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,756
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 7 footnotes

Footnote F1

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

Footnote F2

RSUs that vested June 21, 2024 and each of the next two anniversary dates

Footnote F3

Not Applicable

Footnote F4

RSUs that vest 1/3 on June 15, 2026 and each of the next 2 anniversary dates

Footnote F5

Shares represent common stock of Mesa Labs issued upon release of performance share units issued under the FY24-FY26 performance share unit program

Footnote F6

Shares sold to cover taxes related to the vesting of RSUs and PSUs on June 18, 2026. Transaction was executed under a 10b5-1 plan.

Footnote F7

Consists of 50 shares held by children of which Mr. Sakys is custodian