Mesa Laboratories director granted 1,774 RSUs

A company director received a new grant of 1,774 Restricted Stock Units that vest in 2027.

Rhea-AI Filing Summary

MESA LABORATORIES INC (symbol: MLAB) is the issuer of record for a Form 4 filing submitted to the SEC. Sullivan John James reported acquisition or exercise transactions in this Form 4 filing.

MESA LABORATORIES INC (MLAB) reported that director John James Sullivan received a grant of 1,774 Restricted Stock Units (RSUs) on September 9, 2026. Each RSU represents a contingent right to receive one share of common stock and is scheduled to vest on September 9, 2027, resulting in direct holdings of 1,774 RSUs.

Insider Trade Summary

Grant/Award: 1,774 shares

Grant/Award 1 txn

Insider Sullivan John James

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units - 11 F1, F2, F3	1,774	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units - 11 — 1,774 contracts (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 vest September 9, 2027
3. F3. Not Applicable

Key Figures

RSUs granted: 1,774 units RSU vesting date: September 9, 2027 RSUs held after transaction: 1,774 units

3 metrics

RSUs granted 1,774 units Grant to director on September 9, 2026

RSU vesting date September 9, 2027 Scheduled vesting for granted RSUs

RSUs held after transaction 1,774 units Director’s directly held RSUs following the grant

Key Terms

Restricted Stock Units, contingent right, vest

3 terms

Restricted Stock Units financial

"The security is described as Restricted Stock Units - 11"

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.

contingent right financial

"Each RSU represents a contingent right to receive one share"

vest financial

"RSUs that vest September 9, 2027"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

FAQ

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

What insider transaction did MLAB report for John James Sullivan?

MLAB reported that director John James Sullivan received a grant of 1,774 Restricted Stock Units on September 9, 2026, each representing a contingent right to one share of common stock, with all units scheduled to vest on September 9, 2027.

How many Restricted Stock Units did the MLAB director acquire?

The director acquired 1,774 Restricted Stock Units (RSUs). Following this grant, his directly held derivative position reported in this filing totals 1,774 RSUs linked to MLAB common stock.

When do the granted MLAB RSUs vest?

The RSUs are scheduled to vest on September 9, 2027. Upon vesting, each RSU entitles the holder to receive one share of MLAB common stock, subject to the award’s terms.

Was the MLAB RSU grant to the director made under a Rule 10b5-1 plan?

No. The filing indicates that the Rule 10b5-1 checkbox is not affirmed, and there is no footnote stating that this RSU grant was made pursuant to a Rule 10b5-1 trading plan.

What does each MLAB RSU granted to the director represent?

Each RSU represents a contingent right to receive one share of MLAB common stock. The units convert into shares only upon vesting under the terms of the award.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 09/11/2026 - 01:42 PM EDT Accepted by SEC EDGAR 09/11/2026 - 01:42 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).

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^*

Sullivan John James

(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)
09/09/2026

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

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 - 11	(1)	09/09/2026		A		1,774		(2)	(3)	Common Stock	1,774	$0	1,774	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 September 9, 2027

3. Not Applicable

	John Sakys under Power of Attorney by John Sullivan	09/11/2026
	** 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)