LYTIR

Company · MLAB

Mesa Laboratories, Inc.

Name as listed on its exchange; filed with the SEC as MESA LABORATORIES INC /CO/.

Nasdaq's symbol directory lists MLAB on Nasdaq as “Mesa Laboratories, Inc. - Common Stock”.

In the 12 months to Nov 8, 2026: insiders bought on 2 occasions ($902K); insiders sold on 7 occasions ($1.6M); 2 filings by holders of 5% or more; 1 company report (Form 8-K, since May 26, 2026).

All insider filings at the SEC

Insider purchases and sales, by month (last 12 months)Insider purchases: $902K in total; Insider sales: $1.6M in total.Jun: Insider sales $770KAug: Insider purchases $902KAug: Insider sales $800KDecJanFebMarAprMayJunJulAugSepOctNov
Insider purchases above the line: $902KInsider sales below: $1.6M
Dollar value of open-market purchases and sales reported on SEC Form 4, by the month traded. Sales include pre-arranged 10b5-1 plan sales.

Insider trades · SEC Form 4

Those inside the hall

Open-market purchases and sales only. Legs one person filed for one day are combined.

Who traded

  1. Sullivan John James sold on 1 day latest Aug 13, 2026 sold $800K
  2. Kadia Siddhartha, President and CEO bought on 1 day latest Aug 13, 2026 bought $800K
  3. Sakys John, CFO sold on 2 days all under a 10b5-1 plan latest Jun 22, 2026 sold $377K
  4. Archbold Brian David, SVP Operations sold on 2 days 1 of them under a 10b5-1 plan latest Jun 22, 2026 sold $342K
  5. Tripeny R Tony bought on 1 day latest Aug 13, 2026 bought $102K
  6. Crennen Lyndsey Elizabeth, CAO sold on 2 days 1 of them under a 10b5-1 plan latest Jun 22, 2026 sold $52K
Every trade (9)
  1. SELLSullivan John James sold Aug 13, 2026 7,093 shares filing $800K
  2. BUYKadia Siddhartha, President and CEO bought Aug 13, 2026 7,093 shares filing $800K
  3. BUYTripeny R Tony bought Aug 13, 2026 900 shares filing $102K
  4. SELLSakys John, CFO sold Jun 22, 2026 2,827 shares 10b5-1 plan (scheduled) filing $253K
  5. SELLArchbold Brian David, SVP Operations sold Jun 22, 2026 2,516 shares filing $225K
  6. SELLCrennen Lyndsey Elizabeth, CAO sold Jun 22, 2026 442 shares filing $40K
  7. SELLSakys John, CFO sold Jun 16, 2026 1,223 shares 10b5-1 plan (scheduled) filing $124K
  8. SELLArchbold Brian David, SVP Operations sold Jun 16, 2026 1,151 shares 10b5-1 plan (scheduled) filing $117K
  9. SELLCrennen Lyndsey Elizabeth, CAO sold Jun 16, 2026 118 shares 10b5-1 plan (scheduled) filing $12K

Large holders · SEC Schedules 13D and 13G

Five percent and over

Anyone who comes to hold more than 5% of a company's voting shares must tell the SEC. A Schedule 13D is filed by a holder who may seek to influence the company; a 13G by one who states it is a passive investor. An amendment updates an earlier filing, and a stake reported as 0% means the holder says it has sold all, or nearly all, of its shares. Every recent 13D and 13G

  1. BlackRock, Inc. filed Oct 27, 2026 Schedule 13G/A passive 443,662 shares filing 7.9%
  2. Wasatch Advisors LP filed Oct 9, 2026 Schedule 13G passive 387,129 shares filing 6.9%

Company reports · SEC Form 8-K

In its own words

Current reports the company filed with the SEC; most items are due within four business days of the event. Each line lists the report's items by the SEC's own titles; the filing says what happened. Reports collected since May 26, 2026; every 8-K at the SEC.

  1. Costs associated with exit or disposal activities; Regulation FD disclosure filing Oct 13, 2026

Sources: SEC EDGAR (Forms 4, 144 and 8-K) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.