As of November 10, 2026, Mesa Laboratories Inc. is a publicly traded company (Nasdaq: MLAB); its largest reported holder is Long Path Smaller Companies Fund, LP, with 8.6% on Schedule 13G/A of July 7, 2026, then BlackRock (7.9%). The largest insider holding is Sullivan John James, a director, with 64,528 shares (1.1% of shares outstanding), per Form 4 of October 29, 2026 (Schedule 13G/A, July 7, 2026).
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Is Mesa Laboratories Inc. a real, registered company?
- Mesa Laboratories Inc files with the SEC under CIK 724004 (its SEC filings).
- Its shares are listed under the ticker MLAB on Nasdaq (SEC company record).
- Incorporated in Colorado; business address in Lakewood, Colorado, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under MESA LABORATORIES INC in our court records and SEC 8-K records (as of 2026-11-10).
- Layoffs: 1 exit or restructuring plan reported on Form 8-K, Item 2.05 (latest filed 2026-10-13, about 40 jobs).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names BlackRock (filed 2026-10-27).
Who are Mesa Laboratories Inc.'s owners and officers?
Mesa Laboratories Inc.: incorporated in Colorado; business address in Lakewood, Colorado; industry Industrial Instruments For Measurement, Display, and Control (Schedule 13G/A, 2026-10-27).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-10-27 | Blackrock, Inc. | 7.9% |
| Schedule 13G, 2026-10-09 | Wasatch Advisors LP | 6.9% |
| Schedule 13G/A, 2026-07-07 | Long Path Smaller Companies Fund, LP | 8.6% |
| Schedule 13G/A, 2026-04-15 | Long Path Smaller Companies Fund, LP | 7.3% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
| Schedule 13G, 2026-03-13 | Long Path Smaller Companies Fund, LP | 5.6% |
| Schedule 13G/A, 2025-10-31 | The Vanguard Group | 5.84% |
| Schedule 13G/A, 2025-10-02 | Blackrock, Inc. | 6.9% |
| Schedule 13G/A, 2025-07-18 | Blackrock, Inc. | 14.4% |
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.
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What the Full Report on Mesa Laboratories Inc. covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
16 cited sources found
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Which insiders own Mesa Laboratories Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , a director: 64,528 shares (1.1% of shares outstanding), 19,418 held directly and 45,110 indirectly (Form 4, 2026-10-29).
- , the chief executive and president: 64,135 shares (1.1% of shares outstanding) (Form 4, 2025-10-28).
- , the chief financial officer: 19,835 shares (0.35% of shares outstanding), 19,785 held directly and 50 indirectly (Form 4, 2026-06-23).
- , a director: 12,333 shares (0.22% of shares outstanding) (Form 4, 2026-08-17).
- , a director: 9,082 shares (0.16% of shares outstanding) (Form 4, 2026-08-17).
Shares outstanding: 5,620,520 as of 2026-11-02, from the company's latest SEC cover page.
How much has Mesa Laboratories Inc. raised?
No fundraising or offering filing from Mesa Laboratories Inc. is on file with us.
Red flags found
1 exit or restructuring plan on Form 8-K (latest Form 8-K, 2026-10-13).
Keep reading
More on Mesa Laboratories Inc. and the records around it.
Mesa Laboratories Inc. elsewhere on the record
- 5%+ stake filings Oct 2026
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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