Mesa Laboratories director sells 7,093 shares

Mesa Laboratories director John James Sullivan reported selling 7,093 shares of common stock of MLAB on 2026-08-13 at $112.80 per share in a private transaction to President and CEO Siddhartha Kadia.

Rhea-AI Filing Summary

Mesa Laboratories director John James Sullivan reported selling 7,093 shares of common stock of MLAB on 2026-08-13 at $112.80 per share in a private transaction to President and CEO Siddhartha Kadia. After this sale, Sullivan directly holds 17,834 shares and is also reported as having an indirect interest in 45,110 shares held by the Sullivan Family Trust, for which his spouse is trustee; he disclaims beneficial ownership of those trust shares except to the extent of his pecuniary interest.

Insider Trade Summary

Net Seller: 7,093 shares

Net Sell 2 txns

Insider Sullivan John James

Role Director

Sold 7,093 shs ($800K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	7,093	$112.80	$800K
holding	Common Stock F1, F2	--	--	--

Holdings After Transaction: Common Stock — 17,834 shares (Direct); Common Stock — 45,110 shares (Indirect, By Trust)

Footnotes (2)

1. F1. Represents shares sold directly in a private transaction to Siddhartha Kadia, Mesa President and CEO
2. F2. 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.

Key Figures

Shares sold: 7,093 shares Sale price per share: $112.80 Direct holdings after transaction: 17,834 shares +2 more

5 metrics

Shares sold 7,093 shares Common Stock sale reported for 2026-08-13

Sale price per share $112.80 Per-share price for 7,093-share private sale on 2026-08-13

Direct holdings after transaction 17,834 shares Direct Common Stock held by John James Sullivan after reported sale

Indirect trust holdings 45,110 shares Common Stock held by Sullivan Family Trust, reported as indirect interest

Net shares sold 7,093 shares Net sell volume in this Form 4 per transaction summary

Key Terms

private transaction, beneficial ownership, pecuniary interest, indirect

4 terms

private transaction financial

"Represents shares sold directly in a private transaction to Siddhartha Kadia"

A private transaction is the sale or transfer of securities, assets, or ownership stakes carried out directly between a small number of parties rather than on a public exchange. For investors it matters because these deals are less visible and often less liquid than public trades, so pricing can be harder to verify, the investment can be harder to sell quickly, and buyers or sellers may gain strategic advantages not available in open markets — like negotiated terms similar to a private garage sale versus a crowded marketplace.

beneficial ownership financial

"The reporting person disclaims beneficial ownership of the securities held"

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.

pecuniary interest financial

"except to the extent of his pecuniary interest therein"

indirect financial

"Represents 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 sale did MLAB director John James Sullivan report on August 13, 2026?

MLAB director John James Sullivan reported selling 7,093 shares of common stock on 2026-08-13 at $112.80 per share in a private transaction to President and CEO Siddhartha Kadia. The transaction was reported as a sale of directly held shares.

How many MLAB shares does John James Sullivan directly own after this Form 4 transaction?

After the reported sale, John James Sullivan directly owns 17,834 MLAB common shares. This figure reflects his direct holdings only and excludes shares held indirectly through the Sullivan Family Trust.

What is the reported indirect MLAB shareholding related to John James Sullivan?

An additional 45,110 MLAB shares are held by the Sullivan Family Trust, where Sullivan’s spouse serves as trustee. Sullivan disclaims beneficial ownership of these shares except for his pecuniary interest, so they are reported as indirect holdings.

Who purchased the MLAB shares sold by John James Sullivan in the reported transaction?

The 7,093 MLAB shares were sold in a private transaction to Siddhartha Kadia, Mesa’s President and CEO. The footnote specifies this direct sale, distinguishing it from open-market trades.

Was John James Sullivan’s August 2026 MLAB share sale under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked as being under a plan, and no footnote states that the sale occurred pursuant to a 10b5-1 trading plan. The transaction is therefore reported without plan status.

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

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Available on EDGAR 08/17/2026 - 12:18 PM Accepted by SEC EDGAR 08/17/2026 - 12:18 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^*

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)
08/13/2026

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	08/13/2026		S(1)		7,093	D	$112.8	17,834	D
Common Stock								45,110(1)	I	By Trust(2)

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. Represents shares sold directly in a private transaction to Siddhartha Kadia, Mesa President and CEO

2. 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.

	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)