MESA LABORATORIES INC /CO/ — Director's Dealing 2012

Mar 21, 2012

SEC Form 4/A — Form 4/A

Issuer: MESA LABORATORIES INC /CO (MLAB)
CIK: 0000724004
Period of Report: 2012-03-09

Reporting Person: Sullivan John James (President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-03-13	Common Stock	M	9030	$12.56	Acquired	29992	Direct
2012-03-13	Common Stock	S	9030	$58.54	Disposed	20962	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-03-13	Non-Qualified Stock Option	$12.56	X	9030	Disposed	2014-10-10	Common Stock (9030)	Direct

Footnotes

F1: Transactions Between 3/9/2012 and 3/13/2012

F2: One-third exercisable on each date: 10/11/2006, 10/11/2007, and 10/11/2008