[Form 4] MESA LABORATORIES INC /CO/ Insider Trading Activity

Rhea-AI Filing Summary

Mesa Laboratories (MLAB) reported an insider equity change: the President and CEO acquired 11,558 shares of common stock on 10/27/2025 via a transaction coded M, reflecting settlement of performance share units at a reported price of $0.

Following this transaction, the officer directly holds 64,135 shares. The shares relate to performance share units granted on 10/28/2021 as a special award intended to encourage continued performance and long-term retention, vesting one-third on 10/27/2024 and on each of the next two anniversary dates.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Owens Gary M

(Last) (First) (Middle)

12100 W. 6TH AVENUE

(Street)

LAKEWOOD CO 80228

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MESA LABORATORIES INC /CO/ [ MLAB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
10/27/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/27/2025		M		11,558(1)	A	$0	64,135	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Shares represent common stock of Mesa Labs release of performance share units that were issued on October 28,2021 as a special grant to encourage continued performance and long-term retention. The PSUs vest 1/3 on October 27, 2024 and each of the next two anniversary dates.

	John Sakys under Power of Attorney by Gary Owens	10/28/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did MLAB disclose in this Form 4?

The President and CEO acquired 11,558 common shares on 10/27/2025 through a transaction coded M tied to PSU vesting at a reported price of $0.

How many MLAB shares does the officer hold after the transaction?

The officer directly holds 64,135 shares after the reported transaction.

What is the source of the acquired MLAB shares?

They are from the release of performance share units granted on 10/28/2021 as a special award for retention and performance.

What is the vesting schedule for the MLAB PSUs?

The PSUs vest 1/3 on 10/27/2024 and on each of the next two anniversary dates.

What does transaction code M indicate on a Form 4?

Code M indicates the acquisition or conversion of a derivative security, here reflecting the settlement of PSUs into common shares.

Was a purchase price reported for the MLAB share acquisition?

Yes. The reported price was $0, consistent with PSU settlements that convert into shares without cash paid by the insider.