Mesa Labs director nets 2,784 shares from RSUs

Mesa Laboratories director Jennifer Sadie Alltoft reported the vesting and settlement of 2,784 Restricted Stock Units (RSUs) into common stock of Mesa Laboratories Inc. Each RSU represented one share of common stock and vested on August 15, 2026.

Rhea-AI Filing Summary

Mesa Laboratories director Jennifer Sadie Alltoft reported the vesting and settlement of 2,784 Restricted Stock Units (RSUs) into common stock of Mesa Laboratories Inc. Each RSU represented one share of common stock and vested on August 15, 2026. On that date, 2,784 RSUs were exercised and disposed of as derivatives, and 2,784 shares of common stock were acquired at a stated price of $0.00 per share. Following these transactions, Alltoft directly held 7,662 shares of common stock and had no remaining holdings in the reported RSU award. The filing’s Rule 10b5-1 checkbox was not marked as being under a trading plan.

Insider Trade Summary

2,784 shares exercised/converted

Exercise 2 txns

Insider Alltoft Jennifer Sadie

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units - 9 F1, F2, F3	2,784	$0.00	$0.00
Exercise	Common Stock	2,784	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units - 9 — 0 contracts (Direct); Common Stock — 7,662 shares (Direct)

Footnotes (3)

1. F1. Each RSU represents a contingent right to receive one share of the Issuer's common stock
2. F2. RSUs that vested on August 15, 2026
3. F3. Not Applicable

Key Figures

RSUs exercised/converted: 2,784 shares Common shares acquired: 2,784 shares Post-transaction common holdings: 7,662 shares +3 more

6 metrics

RSUs exercised/converted 2,784 shares Restricted Stock Units converted into Mesa Laboratories common stock on August 15, 2026

Common shares acquired 2,784 shares Common stock received from RSU settlement on August 15, 2026

Post-transaction common holdings 7,662 shares Direct common stock holdings of Jennifer Sadie Alltoft after the reported transactions

RSU-to-share ratio 1 RSU : 1 share Each RSU represents a contingent right to receive one share of common stock

Transaction price per share $0.00 Stated per-share price for common stock acquired in RSU conversion

Transaction date August 15, 2026 Vesting and settlement date for the reported RSUs and related share acquisition

Key Terms

Restricted Stock Units, derivative security, Rule 10b5-1, contingent right

4 terms

Restricted Stock Units financial

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

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

derivative security financial

"transaction_action: derivative exercise/conversion for the RSU derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

Rule 10b5-1 regulatory

"The filing’s Rule 10b5-1 checkbox was not marked as being under a trading plan"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

contingent right financial

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

FAQ

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

What insider transaction did MLAB director Jennifer Sadie Alltoft report on August 15, 2026?

Jennifer Sadie Alltoft reported vesting and settlement of 2,784 RSUs into Mesa Laboratories common stock on August 15, 2026. The derivative RSUs were exercised and converted into 2,784 common shares in a non-cash transaction at a stated price of $0.00 per share.

How many Mesa Laboratories (MLAB) RSUs vested for Jennifer Sadie Alltoft?

A total of 2,784 Restricted Stock Units (RSUs) vested for Jennifer Sadie Alltoft. Each RSU represented a contingent right to receive one share of Mesa Laboratories common stock and vested on August 15, 2026, triggering the reported exercise and conversion.

How many Mesa Laboratories (MLAB) common shares does Jennifer Sadie Alltoft hold after this Form 4?

After the reported transactions, Jennifer Sadie Alltoft directly holds 7,662 shares of Mesa Laboratories common stock. This reflects the acquisition of 2,784 shares from the settlement of vested RSUs and the absence of any remaining position in that RSU award.

Was the August 15, 2026 MLAB insider transaction under a Rule 10b5-1 trading plan?

The filing indicates the Rule 10b5-1 checkbox was not affirmed for these transactions. This means the reported RSU vesting and share acquisition on August 15, 2026 were not designated in the form as executed pursuant to a Rule 10b5-1 trading plan.

What type of securities did MLAB director Jennifer Sadie Alltoft exercise on August 15, 2026?

Jennifer Sadie Alltoft exercised 2,784 Restricted Stock Units (RSUs), reported as a derivative security titled “Restricted Stock Units - 9.” These RSUs each converted into one share of Mesa Laboratories common stock upon vesting and settlement on August 15, 2026.

Did Jennifer Sadie Alltoft sell or buy Mesa Laboratories (MLAB) shares in the market?

The Form 4 reports an exercise and conversion of RSUs, not an open-market purchase or sale. 2,784 RSUs were disposed of as derivatives and simultaneously 2,784 common shares were acquired at a stated price of $0.00 per share in a compensation-related event.

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

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Available on EDGAR 08/17/2026 - 07:33 PM Accepted by SEC EDGAR 08/17/2026 - 07:32 PM 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).

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^*

Alltoft Jennifer Sadie

(Last) (First) (Middle)

12100 W. 6TH AVENUE

(Street)

LAKEWOOD COLORADO 80228

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/15/2026

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	08/15/2026		M		2,784	A	$0	7,662	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 - 9	(1)	08/15/2026		M			2,784	(2)	(3)	Common Stock	2,784	$0	0	D

Explanation of Responses:

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

2. RSUs that vested on August 15, 2026

3. Not Applicable

	John Sakys under Power of Attorney by Jennifer Alltoft	08/17/2026
	** 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)