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Livermore
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Mesa Laboratories Inc

MLAB
Exchange
Nasdaq
Industry
Industrial Instruments For Measurement, Display, and Control
SEC CIK
0000724004

In the last 90 days, Mesa Laboratories Inc insiders filed 2 open-market purchases and 1 sale; 159 institutions reported holding it in 13F filings for Q2 2026, worth $500.8M in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Mesa Laboratories Inc insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
2 filings
2 insiders, $902.4K in total
Open-market sells
1 filing
1 insider, $800.1K in total
Insiders trading
3
Net value
+$102.3K
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Mesa Laboratories Inc, current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Mesa Laboratories Inc
NameTitleLast reported holdingLast filingFilings, past year
Capone Mark ChristopherDirector6,213Sep 11, 20263
Ladiwala Shiraz ShabanaliDirector12,333Sep 11, 20263
Alltoft Jennifer SadieDirector7,662Sep 11, 20262
Hall ShannonDirector6,973Sep 11, 20262
Sullivan John JamesDirector20,618Sep 11, 20264
Tripeny R TonyDirector9,082Sep 11, 20264
Kadia SiddharthaPresident and CEO7,093IndirectAug 17, 20262
Sakys JohnCFO19,785Jun 23, 20263
Archbold Brian DavidSVP Operations6,377Jun 23, 20263
Crennen Lyndsey ElizabethCAO2,020Jun 23, 20262
Owens Gary MPresident and CEO64,135Apr 2, 20262
Schmieder John BradleyDirector62,760Sep 19, 20230
Guillemin EvanDirector29,207Sep 2, 20220
Dinoia GregorySVP Commercial3,634Jun 22, 20220
Mesa Laboratories IncDirector29,788Jun 16, 20220
Kelly David MDirector2,600Nov 9, 20210

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Jun 18, 2025 (view filing)Jun 162 daysArchbold Brian DavidSVP OperationsSSale−472$97.12−$45.8K−45.8%558 after
Jun 18, 2025 (view filing)Jun 162 daysOwens Gary MPresident and CEOSSale−1.94K$97.12−$188.3K−4.1%45.8K after
Mar 10, 2026 (view filing)Mar 10Same dayTripeny R TonyDirectorPPurchase+1.31K$76.00+$99.9K+32.2%5.40K after
Mar 10, 2026 (view filing)Mar 10Same dayCapone Mark ChristopherDirectorPPurchase+1.30K$76.35+$99.3K+61.1%3.43K after
Mar 10, 2026 (view filing)Mar 10Same dayLadiwala Shiraz ShabanaliDirectorPPurchase+3.50K$72.23+$252.8K+69.7%8.52K after
Jun 17, 2026 (view filing)Jun 161 daySakys JohnCFOSSale−1.22K$101.27−$123.9K−6.9%16.5K after10b5-1
Jun 17, 2026 (view filing)Jun 161 dayCrennen Lyndsey ElizabethCAOSSale−118$101.27−$11.9K−7.4%1.47K after10b5-1
Jun 17, 2026 (view filing)Jun 161 dayArchbold Brian DavidSVP OperationsSSale−1.15K$101.27−$116.6K−23.7%3.71K after10b5-1
Jun 23, 2026 (view filing)Jun 221 daySakys JohnCFOSSale−2.83K$89.50−$253.0K−12.5%19.8K after
Jun 23, 2026 (view filing)Jun 221 dayArchbold Brian DavidSVP OperationsSSale−2.52K$89.50−$225.2K−28.3%6.38K after
Jun 23, 2026 (view filing)Jun 221 dayCrennen Lyndsey ElizabethCAOSSale−442$89.50−$39.6K−18.0%2.02K after
Aug 17, 2026 (view filing)11:27 AM ETAug 134 daysTripeny R TonyDirectorPPurchase+900$113.69+$102.3K+16.7%6.30K after
Aug 17, 2026 (view filing)11:49 AM ETAug 134 daysKadia SiddharthaPresident and CEOPPurchase+7.09K$112.80+$800.1KNew position7.09K after
Aug 17, 2026 (view filing)12:18 PM ETAug 134 daysSullivan John JamesDirectorSSale−7.09K$112.80−$800.1K−28.5%17.8K after