Company · Ownership research

MESA LABORATORIES INC /CO/ MLAB

CIK 0000724004

Form 4 transactions dated Nov 1, 2023 to Nov 10, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 41 rows; the complete set is available through the API.

Insider filings on file run through Oct 29, 2026.

Insider purchases & sales

Purchased: $1.35M
Sold: $5.40M

Nov 1, 2023 – Oct 29, 2026
Available records · partial months are marked ·

202610 of 12 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Aug 13, 2026	Sullivan John James Director	Sale	$800.09K 7,093 shares sold	28.46% sold Direct holding	▾
Aug 13, 2026	Kadia Siddhartha President and CEO	Purchase	$800.09K 7,093 shares bought	New holding Trust holding	▾
Aug 13, 2026	Tripeny R Tony Director	Purchase	$102.32K 900 shares bought	16.67% added Direct holding	▾
Jun 22, 2026	Crennen Lyndsey Elizabeth CAO	Sale	$39.56K 442 shares sold	17.95% sold Direct holding	▾
Jun 22, 2026	Archbold Brian David SVP Operations	Sale	$225.19K 2,516 shares sold	28.29% sold Direct holding	▾
Jun 22, 2026	Sakys John CFO	Sale10b5-1 footnote	$253.02K 2,827 shares sold	12.50% sold Direct holding	▾
Jun 16, 2026	Archbold Brian David SVP Operations	Sale	$116.56K 1,151 shares sold	23.68% sold Direct holding	▾
Jun 16, 2026	Crennen Lyndsey Elizabeth CAO	Sale	$11.95K 118 shares sold	7.42% sold Direct holding	▾
Jun 16, 2026	Sakys John CFO	Sale	$123.85K 1,223 shares sold	6.89% sold Direct holding	▾
Mar 10, 2026	Ladiwala Shiraz Shabanali Director	Purchase	$252.81K 3,500 shares bought	69.68% added Direct holding	▾

Showing 12 / 12 record groups in 2026. The complete set is available through the API.

MESA LABORATORIES INC /CO/ · MLAB

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 12 of 12 purchase / sale groups and 30 of 41 other groups; the totals and the monthly series cover the whole window.

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{"action":"list","ticker":"MLAB","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Share totals are on today's split-adjusted basis. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.