SEC Form 4 · accession 0000724004-26-000065

· MLAB

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Officer — CAO

Period of report

Jun 18, 2026

Accepted (ET)

Jun 23, 2026 · 1:34 pm EDT

Rule 10b5-1 plan

box not checked

Issuer CIK

0000724004

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I
Common Stock	Jun 18, 2026	M	125	$95.10	A	1,598	D
Common Stock	Jun 18, 2026	M	233	$95.10	A	1,831	D
Common Stock	Jun 18, 2026	M	368	$95.10	A	2,199	D
Common Stock^F6	Jun 18, 2026	A	263	$95.10	A	2,462	D
Common Stock^F7	Jun 22, 2026	S	442	$89.502	D	2,020	D

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Restricted Stock Unit - 1^F1,F2,F3	—	Jun 18, 2026	M	125	D	Jun 21, 2024	—	Common Stock	125	0	D
Restricted Stock Units - 2^F1,F4,F3	—	Jun 18, 2026	M	233	D	Jun 18, 2025	—	Common Stock	233	232	D
Restricted Stock Units - 3^F1,F5,F3	—	Jun 18, 2026	M	368	D	Jun 19, 2025	—	Common Stock	368	367	D

F1Each RSU represents a contingent right to receive one share of the Issuer's common stock
F2RSUs that vested 1/3 on June 21, 2024 and each of the next two anniversary dates
F3Not Applicable
F4RSUs that vest 1/3 on June 18, 2025 and each of the next two anniversary dates
F5RSUs that vest 1/3 on June 19, 2025 and each of the next 2 anniversary dates
F6Shares represent common stock of Mesa Labs issued upon release of performance share units issued under the FY24-FY26 performance share unit program
F7Shares sold to cover taxes related to the vesting of RSUs and PSUs on June 18, 2026. Transaction was executed under a 10b-1 plan.