As of November 6, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of Mesa Laboratories Inc. The largest reported stake is Long Path Smaller Companies Fund, LP's, at 8.6%. 9 filings are on record since July 18, 2025 (Schedule 13G/A, July 7, 2026).
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Key facts
- · Reporting person: BlackRock, Inc. · Sole voting: 436,324 · Shared voting: 0 · Sole dispositive: 443,662 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-27
- · Reporting person: Wasatch Advisors LP · Sole voting: 261,101 · Shared voting: 0 · Sole dispositive: 387,129 · Shared dispositive: 0 · SCHEDULE 13G, 2026-10-09
- · Reporting person: Long Path Smaller Companies Fund, LP · Sole voting: 0 · Shared voting: 477,126 · Sole dispositive: 0 · Shared dispositive: 477,126 · SCHEDULE 13G/A, 2026-07-07
- · Holder: Long Path Smaller Companies Fund, LP · Percent: 7.3% · SCHEDULE 13G/A
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
Mesa Laboratories Inc has 9 Schedule 13D or 13G filings on record since 2025-07-18. 3 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Layoffs on record: about 40 jobs, latest 2026-10-13 (layoff filings and notices).
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Long Path Smaller Companies Fund, LP | 8.6% | 477,126 | SCHEDULE 13G/A, 2026-07-07 | 2026-06-30 |
| BlackRock, Inc. | 7.9% | 443,662 | SCHEDULE 13G/A, 2026-10-27 | 2026-09-30 |
| Wasatch Advisors LP | 6.9% | 387,129 | SCHEDULE 13G, 2026-10-09 | 2026-09-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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More on Mesa Laboratories Inc and the records around it.
Mesa Laboratories Inc elsewhere on the record
Companies that share a holder
- Wasatch Advisors LP also filed stake reports on 72 other companies: Smith Douglas Homes Corp (Oct 2026), Amtech Systems Inc (Oct 2026), BBB Foods Inc (Oct 2026)
- BlackRock, Inc. also filed stake reports on 1596 other companies: AvePoint, Inc. (Nov 2026), BIOMARIN PHARMACEUTICAL INC (Nov 2026), MSG RANGERS CORP (Nov 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
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What the Full Report on Mesa Laboratories Inc covers
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Long Path Smaller Companies Fund, LP | 0 | 477,126 | 0 | 477,126 | SCHEDULE 13G/A, 2026-07-07 |
| Long Path Fund GP, LLC | 0 | 477,126 | 0 | 477,126 | SCHEDULE 13G/A, 2026-07-07 |
| Long Path Partners, LP | 0 | 477,126 | 0 | 477,126 | SCHEDULE 13G/A, 2026-07-07 |
| Long Path Holdings LLC | 0 | 477,126 | 0 | 477,126 | SCHEDULE 13G/A, 2026-07-07 |
| William Thomas Brennan | 0 | 477,126 | 0 | 477,126 | SCHEDULE 13G/A, 2026-07-07 |
| Brian Paul Nelson | 0 | 477,126 | 0 | 477,126 | SCHEDULE 13G/A, 2026-07-07 |
| BlackRock, Inc. | 436,324 | 0 | 443,662 | 0 | SCHEDULE 13G/A, 2026-10-27 |
| Wasatch Advisors LP | 261,101 | 0 | 387,129 | 0 | SCHEDULE 13G, 2026-10-09 |
The latest filing identifies Mesa Laboratories Inc by CUSIP 59064R109 and gives its principal executive office as 12100 W 6TH AVE, Lakewood, CO 80228 (SCHEDULE 13G/A, 2026-10-27).
What the percentages are based on
The information required by this paragraph is set forth in the cover pages to this Schedule 13G/A and is incorporated herein by reference. Percentage ownership is based on 5,524,931 shares of Common Stock outstanding as of May 21, 2026, as reported in the Issuer's Report on Form 10-K for the fiscal year ended March 31, 2026 filed with the Securities and Exchange Commission on June 3, 2026.Long Path Smaller Companies Fund, LP, SCHEDULE 13G/A, 2026-07-07
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-18 | BlackRock, Inc. | 14.4% | SCHEDULE 13G/A |
| 2025-10-02 | BlackRock, Inc. | 6.9% | SCHEDULE 13G/A |
| 2025-10-31 | The Vanguard Group | 5.84% | SCHEDULE 13G/A |
| 2026-03-13 | Long Path Smaller Companies Fund, LP | 5.6% | SCHEDULE 13G |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-15 | Long Path Smaller Companies Fund, LP | 7.3% | SCHEDULE 13G/A |
| 2026-07-07 | Long Path Smaller Companies Fund, LP | 8.6% | SCHEDULE 13G/A |
| 2026-10-09 | Wasatch Advisors LP | 6.9% | SCHEDULE 13G |
| 2026-10-27 | BlackRock, Inc. | 7.9% | SCHEDULE 13G/A |
Questions about who owns Mesa Laboratories Inc
Who owns Mesa Laboratories Inc?
On this page, 3 holders' latest ownership filings report 5% or more of Mesa Laboratories Inc: Long Path Smaller Companies Fund, LP (8.6%, Schedule 13G/A, filed 2026-07-07), BlackRock, Inc. (7.9%, Schedule 13G/A, filed 2026-10-27) and Wasatch Advisors LP (6.9%, Schedule 13G, filed 2026-10-09).
Who are the largest shareholders of Mesa Laboratories Inc?
By the share each holder's latest filing reports, the largest holders of Mesa Laboratories Inc on this page are Long Path Smaller Companies Fund, LP (8.6%), BlackRock, Inc. (7.9%) and Wasatch Advisors LP (6.9%).
When did Long Path Smaller Companies Fund, LP buy into Mesa Laboratories Inc?
The filings give report dates, not purchase dates. The earliest filing from Long Path Smaller Companies Fund, LP on this page is the Schedule 13G, filed 2026-03-13, reporting 5.6%; its latest, Schedule 13G/A filed 2026-07-07, reports 8.6%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 9 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for Mesa Laboratories Inc
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| June 15, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.