Mesa Labs director gets 2,784 shares in vesting

Mesa Laboratories director John James Sullivan reported the vesting and settlement of 2,784 Restricted Stock Units, each converting into one share of common stock at $0.00 per share, on August 15, 2026.

Rhea-AI Filing Summary

Mesa Laboratories director John James Sullivan reported the vesting and settlement of 2,784 Restricted Stock Units, each converting into one share of common stock at $0.00 per share, on August 15, 2026. This exercise eliminated the RSU balance and increased his directly held common stock to 20,618 shares. He is also reported as having 45,110 shares of common stock held indirectly by the “Sullivan Family Trust,” for which his spouse serves as trustee, and he disclaims beneficial ownership of those trust shares except to the extent of his pecuniary interest.

Insider Trade Summary

2,784 shares exercised/converted

Exercise 3 txns

Insider Sullivan John James

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units - 10 F2, F4, F3	2,784	$0.00	$0.00
Exercise	Common Stock	2,784	$0.00	$0.00
holding	Common Stock F1	--	--	--

Holdings After Transaction: Restricted Stock Units - 10 — 0 contracts (Direct); Common Stock — 20,618 shares (Direct); Common Stock — 45,110 shares (Indirect, By Trust)

Footnotes (4)

1. F1. Represents shares held by the "Sullivan Family Trust" for which the reporting person's spouse serves as trustee. The reporting person disclaims beneficial ownership of the securities held by the trust except to the extent of his pecuniary interest therein
2. F2. Each RSU represents a contingent right to receive one share of the Issuer's common stock
3. F3. Not Applicable
4. F4. RSUs that vested on August 15, 2026

Key Figures

RSUs Exercised: 2,784 shares Exercise Price: $0.00 per share Direct Holdings After Transaction: 20,618 shares +3 more

6 metrics

RSUs Exercised 2,784 shares Restricted Stock Units converted into common stock on August 15, 2026

Exercise Price $0.00 per share Price per share for RSU conversion into common stock

Direct Holdings After Transaction 20,618 shares Common stock directly owned by Sullivan following the RSU conversion

Indirect Trust Holdings 45,110 shares Common stock held by the Sullivan Family Trust, with beneficial ownership disclaimed except for pecuniary interest

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

RSU Balance After Transaction 0 units Restricted Stock Units from this grant remaining after vesting and conversion

Key Terms

Restricted Stock Units, pecuniary interest, beneficial ownership, indirect ownership

4 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.

pecuniary interest financial

"except to the extent of his pecuniary interest therein"

beneficial ownership financial

"The reporting person disclaims beneficial ownership of the securities"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

indirect ownership financial

"shares held by the "Sullivan Family Trust" reported as indirect"

FAQ

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

What insider transaction did John James Sullivan report on Form 4 for MLAB?

John James Sullivan reported the vesting and conversion of 2,784 Restricted Stock Units into 2,784 shares of Mesa Laboratories (MLAB) common stock on August 15, 2026, at $0.00 per share, reflecting settlement of equity compensation rather than an open-market trade.

How many Mesa Laboratories (MLAB) shares does Sullivan hold directly after this Form 4?

After the reported transactions, Sullivan directly holds 20,618 shares of Mesa Laboratories (MLAB) common stock. These shares reflect his direct ownership position following the vesting and conversion of 2,784 RSUs into common stock on August 15, 2026.

What happened to John James Sullivan’s Restricted Stock Units in the MLAB filing?

Sullivan’s 2,784 Restricted Stock Units vested on August 15, 2026 and were converted into 2,784 shares of Mesa Laboratories common stock at $0.00 per share, reducing his RSU derivative position to 0 and increasing his common stock holdings.

How many Mesa Laboratories (MLAB) shares are held indirectly for Sullivan by a trust?

The filing reports 45,110 shares of Mesa Laboratories (MLAB) common stock held indirectly by the “Sullivan Family Trust.” His spouse serves as trustee, and Sullivan disclaims beneficial ownership except to the extent of his pecuniary interest in those trust-held shares.

Were Sullivan’s MLAB transactions reported as under a Rule 10b5-1 trading plan?

The Form 4 for Mesa Laboratories (MLAB) indicates the Rule 10b5-1 checkbox as not checked, meaning the reported RSU vesting and share issuance were not affirmatively identified as being executed under a pre-arranged Rule 10b5-1 trading plan.

What is the net effect of Sullivan’s reported MLAB transactions on his derivative and share positions?

The reported transactions show 2,784 RSUs exercised and converted into 2,784 common shares, leaving 0 RSUs from this grant outstanding and increasing his direct common stock holdings to 20,618 shares, with 45,110 shares reported as indirectly held by a trust.

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

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Accepted by SEC EDGAR 08/17/2026 - 05:01 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)
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	20,618	D
Common Stock								45,110	I	By Trust(1)

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 - 10	(2)	08/15/2026		M			2,784	(4)	(3)	Common Stock	2,784	$0	0	D

Explanation of Responses:

1. Represents shares held by the "Sullivan Family Trust" for which the reporting person's spouse serves as trustee. The reporting person disclaims beneficial ownership of the securities held by the trust except to the extent of his pecuniary interest therein

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

3. Not Applicable

4. RSUs that vested on August 15, 2026

	John Sakys under Power of Attorney by John Sullivan	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)