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Mesa Laboratories

Mesa Laboratories (NASDAQ: MLAB) insider transactions

In the twelve months to 10 November 2026, executives and directors of Mesa Laboratories reported 7 open-market sales of 15,370 shares ($1.6m) and 5 open-market purchases of 14,109 shares ($1.4m), by 8 people, according to the Form 4 filings they submitted to the SEC.

Latest transactions

The 20 most recent transactions in Mesa Laboratories shares reported on Form 4
DateInsiderRoleTransactionSharesPriceHeld afterFiling
13 October 2026Sullivan John JamesDirectorGift−1,200—19,418Form 4
15 August 2026Sullivan John JamesDirectorOption exercise+2,784—20,618Form 4
15 August 2026Tripeny R TonyDirectorOption exercise+2,784—9,082Form 4
15 August 2026Hall ShannonDirectorOption exercise+2,784—6,973Form 4
15 August 2026Ladiwala Shiraz ShabanaliDirectorOption exercise+3,810—12,333Form 4
15 August 2026Alltoft Jennifer SadieDirectorOption exercise+2,784—7,662Form 4
15 August 2026Capone Mark ChristopherDirectorOption exercise+2,784—6,213Form 4
13 August 2026Tripeny R TonyDirectorOpen-market purchase+900$113.696,298Form 4
13 August 2026Kadia SiddharthaPresident and CEOOpen-market purchase+7,093$112.807,093Form 4
13 August 2026Sullivan John JamesDirectorOpen-market sale−7,093$112.8017,834Form 4
22 June 2026Sakys JohnCFOOpen-market sale−2,827$89.5019,785Form 4
22 June 2026Archbold Brian DavidSVP OperationsOpen-market sale−2,516$89.506,377Form 4
22 June 2026Crennen Lyndsey ElizabethCAOOpen-market sale−442$89.502,020Form 4
18 June 2026Sakys JohnCFOOption exercise+1,036$95.1017,574Form 4
18 June 2026Sakys JohnCFOOption exercise+2,756$95.1020,330Form 4
18 June 2026Sakys JohnCFOGrant or award+2,282$95.1022,612Form 4
18 June 2026Archbold Brian DavidSVP OperationsOption exercise+844$95.104,554Form 4
18 June 2026Archbold Brian DavidSVP OperationsOption exercise+2,480$95.107,034Form 4
18 June 2026Archbold Brian DavidSVP OperationsGrant or award+1,859$95.108,893Form 4
18 June 2026Crennen Lyndsey ElizabethCAOOption exercise+125$95.101,598Form 4

Names appear as in the filing, surname first. A dash in the price column means the filing reports none, as in grants and gifts.

How to read the table

Only open-market purchases and sales are trades the insider chose to make at the market price, and they are the ones counted in the summary above. Grants, option exercises and shares withheld for tax come from pay plans. A sale marked as a 10b5-1 plan was scheduled in advance under a written plan.

Where each row comes from

From the Form 4 that each executive, director or large shareholder must file with the SEC within two business days of a transaction, read up to 10 November 2026. Each row links to its filing on EDGAR. Only transactions in shares are listed, not derivatives, and amended filings are left out. The accounts of the company are on the Mesa Laboratories page; the method, in data sources.

Information prepared from the Form 4 filings submitted to the SEC, for information purposes only. It is not financial advice or a recommendation to buy or sell. Updated on 12 November 2026.