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Ownership Document
|
| Schema Version: X0508 |
| Document Type: 4 |
| Period of Report: 4/2/24 |
| Not Subject to Section 16: 0 |
| Issuer: |
| Issuer CIK: 724004 |
| Issuer Name: MESA LABORATORIES INC /CO/ |
| Issuer Trading Symbol: MLAB |
| Reporting Owner: |
| Reporting Owner ID: |
| | Owner CIK: 1305784 |
| | Owner Name: Sullivan John James |
| Reporting Owner Address: |
| | Owner Street 1: 12100 W. 6TH AVENUE |
| | Owner Street 2: |
| | Owner City: LAKEWOOD |
| | Owner State: CO |
| | Owner ZIP Code: 80228 |
| | Owner State Description: |
| Reporting Owner Relationship: |
| | Is Director? Yes |
| | Is Officer? No |
| | Is Ten Percent Owner? No |
| | Is Other? No |
| Aff 10b5 One: 0 |
| Derivative Table: |
| Derivative Transaction: |
| | Security Title: |
| | | Value: Non Qualified Stock Option |
| | Conversion or Exercise Price: |
| | | Value: 142.4 |
| | Transaction Date: |
| | | Value: 4/2/24 |
| | Transaction Coding: |
| | | Transaction Form Type: 4 |
| | | Transaction Code: E |
| | | Equity Swap Involved? No |
| | Transaction Timeliness: |
| | | Value: |
| | Transaction Amounts: |
| | | Transaction Shares: |
| Value: 450 |
| | | Transaction Price Per Share: |
| Value: 0 |
| | | Transaction Acquired-Disposed Code: |
| Value: D |
| | Exercise Date: |
| | | Value: 4/2/19 |
| | | Footnote ID: F1 |
| | Expiration Date: |
| | | Value: 4/2/24 |
| | | Footnote ID: F2 |
| | Underlying Security: |
| | | Underlying Security Title: |
| Value: Common Stock |
| | | Underlying Security Shares: |
| Value: 450 |
| | Post-Transaction Amounts: |
| | | Shares Owned Following Transaction: |
| Value: 0 |
| | Ownership Nature: |
| | | Direct or Indirect Ownership: |
| Value: D |
| Footnotes: |
| Footnote - F1: NSOs that vest 1/5 on each anniversary date of the April 2, 2018 grant date |
| Footnote - F2: NSOs that expired on April 2, 2024 |
| Owner Signature: |
| Signature Name: John Sakys under Power of Attorney by John Sullivan |
| Signature Date: 4/3/24 |
