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Mesa Laboratories (MLAB) CFO reports grants, RSU conversions and tax-cover share sale

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Mesa Laboratories CFO John Sakys reported multiple equity transactions in Mesa Laboratories common stock. On June 18, 2026, he received a grant of 2,282 shares of common stock and exercised restricted stock units (RSUs) that converted into 2,756 and 1,036 shares of common stock.

On June 22, 2026, he sold 2,827 shares at an average price of $89.502 per share. A footnote states these shares were sold to cover taxes related to the vesting of RSUs and performance share units on June 18, 2026, and that the transaction was executed under a Rule 10b5-1 trading plan.

After these transactions, Sakys held 19,785 Mesa Laboratories shares directly, plus 50 shares indirectly as custodian for his children.

Positive

  • None.

Negative

  • None.
Insider Sakys John
Role CFO
Sold 2,827 shs ($253K)
Type Security Shares Price Value
Sale Common Stock 2,827 $89.502 $253K
Exercise Restricted Stock Units - 6 1,036 $0.00 --
Exercise Restricted Stock Units - 7 2,756 $0.00 --
Exercise Common Stock 1,036 $95.10 $99K
Exercise Common Stock 2,756 $95.10 $262K
Grant/Award Common Stock 2,282 $95.10 $217K
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 19,785 shares (Direct, null); Restricted Stock Units - 6 — 0 shares (Direct, null); Restricted Stock Units - 7 — 2,755 shares (Direct, null); Common Stock — 50 shares (Indirect, Custodian)
Footnotes (1)
  1. Each RSU represents a contingent right to receive one share of the Issuer's common stock. RSUs that vested June 21, 2024 and each of the next two anniversary dates Not Applicable RSUs that vest 1/3 on June 15, 2026 and each of the next 2 anniversary dates Shares represent common stock of Mesa Labs issued upon release of performance share units issued under the FY24-FY26 performance share unit program Shares sold to cover taxes related to the vesting of RSUs and PSUs on June 18, 2026. Transaction was executed under a 10b5-1 plan. Consists of 50 shares held by children of which Mr. Sakys is custodian
Shares sold 2,827 shares Open-market sale on June 22, 2026 at $89.502 per share
Sale price $89.502/share Average price for 2,827 shares sold on June 22, 2026
Direct holdings after sale 19,785 shares Common stock directly owned by CFO after reported transactions
Indirect custodian holdings 50 shares Shares held for children where CFO is custodian
Equity grant 2,282 shares Common stock grant/award on June 18, 2026 at $95.10
RSU conversion 1 2,756 shares Common shares issued from Restricted Stock Units - 7 on June 18, 2026
RSU conversion 2 1,036 shares Common shares issued from Restricted Stock Units - 6 on June 18, 2026
RSU exercise price $0.00/share Conversion or exercise price for RSU-derived shares
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.
performance share units financial
"Shares represent common stock of Mesa Labs issued upon release of performance share units issued under the FY24-FY26 performance share unit program"
Performance share units are a type of company stock award given to employees that depend on the company meeting specific goals or targets. If these goals are achieved, the employee receives shares or the value of shares; if not, they may receive little or no compensation. This aligns employees’ interests with the company's success and encourages performance that benefits investors.
Rule 10b5-1 plan regulatory
"Transaction was executed under a 10b5-1 plan."
A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.
custodian financial
"Consists of 50 shares held by children of which Mr. Sakys is custodian"
A custodian is a financial institution that holds and safeguards an investor's assets—such as stocks, bonds, or cash—and records transactions on the investor's behalf. Think of it as a trusted caretaker or safe-deposit box for investments; it helps prevent loss or theft, handles paperwork and transfers, and provides transparency and regulatory checks, so investors can focus on decisions rather than the mechanics or security of asset storage.
grant, award, or other acquisition financial
"Grant, award, or other acquisition"
Exercise or conversion of derivative security financial
"Exercise or conversion of derivative security"
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SEC Form 4
FORM 4UNITED 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*
Sakys John

(Last)(First)(Middle)
MESA LABORATORIES, INC.
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)
Director10% Owner
XOfficer (give title below)Other (specify below)
CFO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/18/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock06/18/2026M1,036A$95.117,574D
Common Stock06/18/2026M2,756A$95.120,330D
Common Stock06/18/2026A2,282(5)A$95.122,612D
Common Stock06/22/2026S2,827(6)D$89.50219,785D
Common Stock50ICustodian(7)
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units - 6(1)06/18/2026M1,03606/21/2024(2) (3)Common Stock1,036$00D
Restricted Stock Units - 7(1)06/18/2026M2,75606/18/2025(4) (3)Common Stock2,756$02,755D
Explanation of Responses:
1. Each RSU represents a contingent right to receive one share of the Issuer's common stock.
2. RSUs that vested June 21, 2024 and each of the next two anniversary dates
3. Not Applicable
4. RSUs that vest 1/3 on June 15, 2026 and each of the next 2 anniversary dates
5. Shares represent common stock of Mesa Labs issued upon release of performance share units issued under the FY24-FY26 performance share unit program
6. Shares sold to cover taxes related to the vesting of RSUs and PSUs on June 18, 2026. Transaction was executed under a 10b5-1 plan.
7. Consists of 50 shares held by children of which Mr. Sakys is custodian
John Sakys06/23/2026
** Signature of Reporting PersonDate
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)

FAQ

What insider transactions did Mesa Laboratories (MLAB) CFO John Sakys report?

John Sakys reported a mix of equity transactions. He received 2,282 common shares as a grant, exercised RSUs converting into 3,792 common shares, and then sold 2,827 shares. These moves reflect routine equity compensation and related tax-management activity.

How many Mesa Laboratories (MLAB) shares did the CFO sell and at what price?

The CFO sold 2,827 Mesa Laboratories shares at $89.502 each. This open-market sale occurred on June 22, 2026. A footnote notes that the sale’s purpose was to cover tax obligations arising from recently vested RSUs and performance share units.

Why did Mesa Laboratories (MLAB) CFO’s Form 4 show a share sale on June 22, 2026?

The June 22, 2026 sale was to cover taxes on equity vesting. The filing states the 2,827 shares sold were used to cover taxes related to RSU and PSU vesting on June 18, 2026, and were executed under a pre-arranged Rule 10b5-1 plan.

What is a Rule 10b5-1 plan in the context of Mesa Laboratories (MLAB) CFO’s trades?

A Rule 10b5-1 plan is a pre-arranged trading program. The filing notes the CFO’s tax-cover sale on June 22, 2026 was executed under such a plan, indicating trades were scheduled in advance rather than timed based on nonpublic information or short-term market conditions.

How many Mesa Laboratories (MLAB) shares does the CFO hold after these transactions?

After the reported transactions, the CFO holds 19,785 shares directly. The Form 4 also shows an additional 50 shares held indirectly, in an account for his children where he acts as custodian, giving a fuller picture of his reported equity position.

What RSU and PSU activity did Mesa Laboratories (MLAB) disclose for its CFO?

The CFO’s RSUs converted into common stock on June 18, 2026. The filing shows 2,756 and 1,036 RSU-related shares issued, plus 2,282 shares from a grant. A footnote adds that some shares came from performance share units under the FY24–FY26 program.