[Form 4] Mesa Laboratories Inc Insider Trading Activity

Rhea-AI Filing Summary

Mesa Laboratories Inc. (MLAB) – Form 4 insider transaction dated 06/18/2025

Senior Vice-President of Operations Brian D. Archbold reported the automatic conversion of 2,556 restricted stock units (RSUs) into common shares (Transaction Code M) at a reference price of $92.99 per share. To cover tax obligations, he simultaneously disposed of 1,166 shares via a tax-withholding transaction (Code F) at the same price.

Post-transaction direct holdings changed as follows:

• Common stock: 1,948 shares now held directly (down from 3,114 immediately after the RSU conversion).
• Unvested/remaining RSUs: 4,960 units retained, scheduled to vest one-third on 18 June 2025 and on each of the next two anniversaries.

The activity reflects routine equity compensation vesting rather than an open-market purchase or sale; no cash was exchanged for the share acquisition portion.

Insights

Securities Analyst

TL;DR: Routine RSU vesting; neutral signal, limited market impact.

The filing shows a standard equity-compensation event. Archbold converted 2,556 RSUs and withheld 1,166 shares for taxes, netting 1,390 new shares. His remaining 4,960 RSUs keep future alignment with shareholders. Because the shares were not bought on the open market and were paired with an automatic tax sale, the transaction does not suggest a discretionary bullish or bearish view. Overall float impact is immaterial for Mesa Labs’ ~5 million-share base, so I view the disclosure as neutral.

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Archbold Brian David

(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)
	SVP Operations

3. Date of Earliest Transaction (Month/Day/Year)
06/18/2025

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	06/18/2025		M		2,556	A	$92.99	3,114	D
Common Stock	06/18/2025		F		1,166	D	$92.99	1,948	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
Restricted Stock Units - 8	(1)	06/18/2025		M			2,556	(2)	(3)	Common Stock	2,556	$0	4,960	D

Explanation of Responses:

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

2. RSUs that vest 1/3 on June 18, 2025 and each of the next two anniversary dates

3. Not Applicable

	John Sakys under Power of Attorney from Brian Archbold	06/20/2025
	** 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 insider activity was reported for MLAB on 06/18/2025?

SVP Operations Brian Archbold converted 2,556 RSUs to common shares and disposed of 1,166 shares for taxes.

How many Mesa Laboratories shares does Brian Archbold now hold?

After the transactions he holds 1,948 common shares directly and 4,960 unvested RSUs.

Was cash used to purchase the shares?

No. The shares came from RSU vesting (Code M), a non-cash conversion.

Does the filing indicate open-market buying or selling?

No. Both actions are automatic: RSU conversion and tax-withholding sale, not discretionary market trades.

What is the vesting schedule for the remaining RSUs?

The RSUs vest one-third on 18 June 2025 and on each of the next two annual anniversaries.