Mesa Laboratories Inc. (MLAB) Insider Trading

Last 12 months

Insiders bought $1.35M and sold $1.57M on the open market.

32% of the selling was scheduled in advance under 10b5-1 plans. Director John James Sullivan sold $800k on Aug 13, 10% of their stake, outside a plan.

Net open-market

−$216k

5 buys · 7 sales

Under a 10b5-1 plan

32%

of the value sold

Insiders who bought / sold

4 / 4

executives and directors

Last open-market buy

Aug 2026

Aug 13, 2026

Get an email when MLAB's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Aug 13	John James Sullivan Director	SoldNo plan	7,093	$112.80	$800k	10%	Form 4
Aug 13	Siddhartha Kadia President and CEO	Bought	7,093	$112.80	$800k	New	Form 4
Aug 13	R Tony Tripeny Director	Bought	900	$113.69	$102k	17%	Form 4
Jun 22	Lyndsey Elizabeth Crennen CAO	SoldNo plan	442	$89.50	$40k	18%	Form 4
Jun 22	Brian David Archbold SVP Operations	SoldNo plan	2,516	$89.50	$225k	28%	Form 4
Jun 22	John Sakys CFO	Sold10b5-1 plan	2,827	$89.50	$253k	12%	Form 4
Jun 16	Brian David Archbold SVP Operations	Sold10b5-1 plan	1,151	$101.27	$117k	24%	Form 4
Jun 16	Lyndsey Elizabeth Crennen CAO	Sold10b5-1 plan	118	$101.27	$12k	7.4%	Form 4
Jun 16	John Sakys CFO	Sold10b5-1 plan	1,223	$101.27	$124k	6.9%	Form 4
Mar 10	Shiraz Shabanali Ladiwala Director	Bought	3,500	$72.23	$253k	70%	Form 4
Mar 10	Mark Christopher Capone Director	Bought	1,301	$76.35	$99k	61%	Form 4
Mar 10	R Tony Tripeny Director	Bought	1,315	$76.00	$100k	32%	Form 4
Jun 16, 2025	Gary M Owens President and CEO	SoldNo plan	1,939	$97.12	$188k	4.1%	Form 4
Jun 16, 2025	Brian David Archbold SVP Operations	SoldNo plan	472	$97.12	$46k	46%	Form 4
Jun 16, 2025	John Sakys CFO	SoldNo plan	642	$97.12	$62k	4.8%	Form 4
Mar 19, 2025	Gary M Owens President and CEO	Sold10b5-1 plan	21,000	$123.91	$2.6M	33%	Form 4
Oct 28, 2024 – Oct 29, 2024	Gary M Owens President and CEO	SoldNo plan 2 parts	5,069	$112.79 average	$572k	10%	Form 4

Aug 13No plan
John James Sullivan
Director · sold 7,093 at $112.80
$800k
10% of stake
Aug 13
Siddhartha Kadia
President and CEO · bought 7,093 at $112.80
$800k
New position
Aug 13
R Tony Tripeny
Director · bought 900 at $113.69
$102k
17% of stake
Jun 22No plan
Lyndsey Elizabeth Crennen
CAO · sold 442 at $89.50
$40k
18% of stake
Jun 22No plan
Brian David Archbold
SVP Operations · sold 2,516 at $89.50
$225k
28% of stake
Jun 2210b5-1 plan
John Sakys
CFO · sold 2,827 at $89.50
$253k
12% of stake
Jun 1610b5-1 plan
Brian David Archbold
SVP Operations · sold 1,151 at $101.27
$117k
24% of stake
Jun 1610b5-1 plan
Lyndsey Elizabeth Crennen
CAO · sold 118 at $101.27
$12k
7.4% of stake
Jun 1610b5-1 plan
John Sakys
CFO · sold 1,223 at $101.27
$124k
6.9% of stake
Mar 10
Shiraz Shabanali Ladiwala
Director · bought 3,500 at $72.23
$253k
70% of stake
Mar 10
Mark Christopher Capone
Director · bought 1,301 at $76.35
$99k
61% of stake
Mar 10
R Tony Tripeny
Director · bought 1,315 at $76.00
$100k
32% of stake
Jun 16, 2025No plan
Gary M Owens
President and CEO · sold 1,939 at $97.12
$188k
4.1% of stake
Jun 16, 2025No plan
Brian David Archbold
SVP Operations · sold 472 at $97.12
$46k
46% of stake
Jun 16, 2025No plan
John Sakys
CFO · sold 642 at $97.12
$62k
4.8% of stake
Mar 19, 202510b5-1 plan
Gary M Owens
President and CEO · sold 21,000 at $123.91
$2.6M
33% of stake
Oct 28, 2024 – Oct 29, 2024No plan
Gary M Owens
President and CEO · sold 5,069 at avg $112.79
$572k
10% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch MLAB, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in MLAB's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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