Key facts
- This page summarizes Shannon Hall's Form 4 filing for MESA LABORATORIES INC /CO/ (MLAB).
- 2 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 17 Aug 2026, 17:46.
Shannon Hall - 15 Aug 2026 Form 4 Insider Report for MESA LABORATORIES INC /CO/ (MLAB)
- Reporting relationship
- Director
- Issuer ticker
- MLAB
- Reported as of
- 15 Aug 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 17 Aug 2026, 17:46:25 UTC
- Prior SEC filing
- 18 Aug 2025
- Source filing
- View source filing
- Reporting owner signature
- John Sakys under Power of Attorney by Shannon Hall
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Shannon Hall filed Form 4 for MESA LABORATORIES INC /CO/ (MLAB) on 17 Aug 2026.
Change
- Previous filing in this sequence was filed on 18 Aug 2025.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001621222
Primary reporting owner
Hall Shannon
- Relationship
- Director
- Address
- 123 CLEARFIELD DRIVE, SAN FRANCISCO
- Signature
- John Sakys under Power of Attorney by Shannon Hall
- Signature date
- 17 Aug 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
MLAB
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +2,784
- Change %
- +66%
- Price
- $0.000000*
- Shares after
- 6,973
- Date
- 15 Aug 2026
- Ownership
- Direct
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
MLAB
transaction
Derivative
Restricted Stock Units - 8
Options Exercise
- Transaction value
- Shares
- -2,784
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 15 Aug 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 2,784
- Exercise price
- Footnotes
- F1, F2, F3
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 3 footnotes
Footnote F1
Each RSU represents a contingent right to receive one share of the Issuer's common stock
Footnote F2
RSUs that vested on August 15, 2026
Footnote F3
Not Applicable