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Mesa Laboratories Inc. (MLAB)

Mesa Laboratories Inc. (MLAB) Insider Trading

Directors, officers and holders of more than 10% of MLAB report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.

Recent Form 4 transactions

The 50 most recent of 142 transactions on file: 2 with code P, 7 with code S and 41 with other codes.

DateInsiderCodeShares
Oct 13, 2026Sullivan John JamesG Gift1,200
Sep 9, 2026Sullivan John JamesA Award1,774
Sep 9, 2026Capone Mark ChristopherA Award2,423
Sep 9, 2026Tripeny R TonyA Award1,774
Sep 9, 2026Hall ShannonA Award1,774
Sep 9, 2026Ladiwala Shiraz ShabanaliA Award2,510
Aug 15, 2026Capone Mark ChristopherM Exercise2,784
Aug 15, 2026Tripeny R TonyM Exercise2,784
Aug 15, 2026Sullivan John JamesM Exercise2,784
Aug 15, 2026Alltoft Jennifer SadieM Exercise2,784
Aug 15, 2026Hall ShannonM Exercise2,784
Aug 15, 2026Hall ShannonM Exercise2,784
Aug 15, 2026Ladiwala Shiraz ShabanaliM Exercise3,810
Aug 15, 2026Sullivan John JamesM Exercise2,784
Aug 15, 2026Tripeny R TonyM Exercise2,784
Aug 15, 2026Capone Mark ChristopherM Exercise2,784
Aug 15, 2026Alltoft Jennifer SadieM Exercise2,784
Aug 15, 2026Ladiwala Shiraz ShabanaliM Exercise3,810
Aug 13, 2026Sullivan John JamesS Sale7,093
Aug 13, 2026Kadia SiddharthaP Purchase7,093
Aug 13, 2026Tripeny R TonyP Purchase900
Jun 22, 2026Crennen Lyndsey ElizabethS Sale442
Jun 22, 2026Archbold Brian DavidS Sale2,516
Jun 22, 2026Sakys JohnS Sale2,827
Jun 18, 2026Crennen Lyndsey ElizabethM Exercise233
Jun 18, 2026Crennen Lyndsey ElizabethM Exercise368
Jun 18, 2026Crennen Lyndsey ElizabethM Exercise368
Jun 18, 2026Crennen Lyndsey ElizabethM Exercise125
Jun 18, 2026Crennen Lyndsey ElizabethM Exercise233
Jun 18, 2026Archbold Brian DavidA Award1,859
Jun 18, 2026Archbold Brian DavidM Exercise844
Jun 18, 2026Sakys JohnA Award2,282
Jun 18, 2026Sakys JohnM Exercise2,756
Jun 18, 2026Archbold Brian DavidM Exercise2,480
Jun 18, 2026Sakys JohnM Exercise2,756
Jun 18, 2026Sakys JohnM Exercise1,036
Jun 18, 2026Archbold Brian DavidM Exercise844
Jun 18, 2026Archbold Brian DavidM Exercise2,480
Jun 18, 2026Crennen Lyndsey ElizabethM Exercise125
Jun 18, 2026Sakys JohnM Exercise1,036
Jun 18, 2026Crennen Lyndsey ElizabethA Award263
Jun 16, 2026Crennen Lyndsey ElizabethS Sale118
Jun 16, 2026Archbold Brian DavidS Sale1,151
Jun 16, 2026Sakys JohnS Sale1,223
Jun 15, 2026Sakys JohnE Expiration3,951
Jun 15, 2026Sakys JohnM Exercise2,717
Jun 15, 2026Sakys JohnA Award8,416
Jun 15, 2026Archbold Brian DavidE Expiration1,780
Jun 15, 2026Archbold Brian DavidM Exercise2,454
Jun 15, 2026Archbold Brian DavidA Award4,328

The full Form 4 history is on the MLAB company page (Insider Trades card, View all).

Questions about this data

Which insider transactions are open-market trades?

Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.

How quickly are insider trades reported?

A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.

Who has to file Form 4?

Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.

Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.