Mesa Labs CAO sells 118 shares for tax on RSUs

Mesa Laboratories Chief Accounting Officer Lyndsey Elizabeth Crennen reported an open-market sale of common stock.

Rhea-AI Filing Summary

Mesa Laboratories Chief Accounting Officer Lyndsey Elizabeth Crennen reported an open-market sale of common stock. On June 16, 2026, she sold 118 shares of Mesa Laboratories common stock at an average price of $101.267 per share. According to the footnote, the shares were sold to cover taxes due on restricted stock units (RSUs) that vested on June 15, 2026, indicating a tax-related transaction rather than a discretionary portfolio move. Following this sale, Crennen directly holds 1,473 shares of Mesa Laboratories common stock.

Insider Trade Summary 10b5-1

Net Seller: 118 shares

Net Sell 1 txn

Insider Crennen Lyndsey Elizabeth

Role CAO

Sold 118 shs ($12K)

Type	Security	Shares	Price	Value
Sale	Common Stock	118	$101.267	$12K

Holdings After Transaction: Common Stock — 1,473 shares (Direct)

Footnotes (1)

1. F1. Shares sold to cover taxes due on RSU which vested on June 15, 2026

Key Figures

Shares sold: 118 shares Sale price per share: $101.267 per share Shares held after transaction: 1,473 shares

3 metrics

Shares sold 118 shares Open-market sale on June 16, 2026

Sale price per share $101.267 per share Average price for the 118 shares sold

Shares held after transaction 1,473 shares Direct ownership after the June 16, 2026 sale

Key Terms

open-market sale, restricted stock units (RSUs), Common Stock, Chief Accounting Officer

4 terms

open-market sale financial

"transaction_action: "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

restricted stock units (RSUs) financial

"Shares sold to cover taxes due on RSU which vested on June 15, 2026"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

Common Stock financial

"security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Chief Accounting Officer financial

"officer_title: "CAO""

A chief accounting officer is a senior executive responsible for overseeing a company's financial records and ensuring all accounting practices are accurate and compliant with regulations. They play a key role in preparing financial reports that help investors understand the company's financial health, much like a trusted navigator guiding a ship through complex waters. Their work ensures transparency and trust in the company's financial information.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Mesa Laboratories (MLAB) report in this Form 4?

Mesa Laboratories reported that CAO Lyndsey Elizabeth Crennen sold 118 shares of common stock. The sale occurred on June 16, 2026, and was tied to tax obligations arising from RSUs that vested the previous day.

At what price did the Mesa Laboratories (MLAB) insider shares sell?

The 118 Mesa Laboratories shares sold at an average price of $101.267 per share. This price reflects an open-market sale executed on June 16, 2026, as disclosed in the Form 4 filing.

Why did Mesa Laboratories (MLAB) CAO sell shares in June 2026?

The filing states the shares were sold to cover taxes due on RSUs that vested on June 15, 2026. This indicates a tax-driven transaction rather than a purely discretionary sale of Mesa Laboratories stock.

How many Mesa Laboratories (MLAB) shares does the insider hold after the sale?

After selling 118 shares, CAO Lyndsey Elizabeth Crennen directly holds 1,473 shares of Mesa Laboratories common stock. This post-transaction holding is disclosed in the Form 4 as the insider’s remaining direct ownership.

What role does the reporting person hold at Mesa Laboratories (MLAB)?

The reporting person, Lyndsey Elizabeth Crennen, serves as Chief Accounting Officer (CAO) of Mesa Laboratories. Her officer status and title are explicitly identified in the insider ownership information within the Form 4 filing.

Was the Mesa Laboratories (MLAB) insider transaction an open-market sale?

Yes. The Form 4 describes the transaction as an open-market sale of common stock. However, the footnote clarifies that the sale’s purpose was to cover tax obligations from recently vested RSUs.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/17/2026 - 12:19 PM EDT Learn about SEC filing 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

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).

X

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^*

Crennen Lyndsey Elizabeth

(Last) (First) (Middle)

2850 S CLARKSON CIRCLE

(Street)

ENGLEWOOD COLORADO 80113

(City) (State) (Zip)

UNITED STATES

(Country)

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)
	CAO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/16/2026

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

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

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

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	06/16/2026		S		118(1)	D	$101.267	1,473	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 sold to cover taxes due on RSU which vested on June 15, 2026

	John Sakys under Power of Attorney by Lyndsey Crennen	06/17/2026
	** 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.
* Form 4: SEC 1474 (03-26)