Mesa Laboratories grants director 1,774 RSUs

Director Shannon Hall received a grant of 1,774 time-vested RSUs tied to Mesa Laboratories common stock.

Rhea-AI Filing Summary

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

MESA LABORATORIES INC (MLAB) reported that director Shannon Hall 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 ownership of 1,774 RSUs following the award.

Insider Trade Summary

Grant/Award: 1,774 shares

Grant/Award 1 txn

Insider Hall Shannon

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units - 9 F1, F2, F3	1,774	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units - 9 — 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 on September 9, 2027
3. F3. Not Applicable

Key Figures

RSUs granted: 1,774 units Price per RSU: $0.00 per unit RSUs following transaction: 1,774 units +2 more

5 metrics

RSUs granted 1,774 units Restricted Stock Units awarded to director Shannon Hall on September 9, 2026

Price per RSU $0.00 per unit Reported transaction price for the RSU grant

RSUs following transaction 1,774 units Total direct RSU holdings by Shannon Hall after the grant

Underlying common shares 1,774 shares Each RSU represents a contingent right to receive one share of common stock

RSU vesting date September 9, 2027 Date on which the RSUs are scheduled to vest

Key Terms

Restricted Stock Units, contingent right, vesting

3 terms

Restricted Stock Units financial

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

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"

vesting financial

"RSUs that vest on September 9, 2027"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

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

What insider transaction did MLAB disclose for Shannon Hall?

MLAB disclosed that director Shannon Hall received a grant of 1,774 Restricted Stock Units on September 9, 2026, as an equity award representing contingent rights to receive common shares, with no cash price per unit reported.

How many RSUs did Shannon Hall acquire in this MLAB Form 4 filing?

Shannon Hall acquired 1,774 Restricted Stock Units. Following this grant, Hall directly holds 1,774 RSUs, each representing a contingent right to receive one share of Mesa Laboratories common stock, subject to vesting conditions.

When do Shannon Hall’s MLAB RSUs vest?

The Form 4 states that the RSUs vest on September 9, 2027. Vesting is a condition that must be satisfied before the RSUs convert into shares of Mesa Laboratories common stock deliverable to the director.

What does each RSU granted to Shannon Hall by MLAB represent?

Each RSU granted to Shannon Hall represents a contingent right to receive one share of Mesa Laboratories common stock. The RSUs carry no exercise price and convert into shares if and when the vesting date and conditions are met.

Was Shannon Hall’s MLAB RSU grant made under a Rule 10b5-1 plan?

The filing’s Rule 10b5-1 checkbox is not marked as being under a trading plan. There is no footnote indicating that the RSU grant was made pursuant to a Rule 10b5-1 trading arrangement.

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

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Available on EDGAR 09/11/2026 - 01:57 PM Accepted by SEC EDGAR 09/11/2026 - 01:57 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^*

Hall Shannon

(Last) (First) (Middle)

123 CLEARFIELD DRIVE

(Street)

SAN FRANCISCO CALIFORNIA 94132

(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 - 9	(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 on September 9, 2027

3. Not Applicable

	John Sakys under Power of Attorney by Shannon Hall	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)