MESA LABS INC

Ticker: MLAB CUSIP: 59064R109 Class: Common Stock

Mawer Investment Management Ltd.'s Holding History (CIK: 0001538449)

Note: Option positions (PUT/CALL) are excluded.

Q1 2014

Shares 42,501 Value ($000) $3,836 Avg Close $80.28 Range $67.42 - $90.75

Q4 2013

Shares 77,530 Value ($000) $6,092 Avg Close $68.72 Range $61.20 - $78.13

Q3 2013

Shares 77,325 Value ($000) $5,228 Avg Close $60.15 Range $50.50 - $68.22

Q2 2013

Shares 80,997 Value ($000) $4,384 Avg Close $48.72 Range $43.39 - $52.49

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2014	42,501	$3,836	$80.28	$67.42 - $90.75
Q4 2013	77,530	$6,092	$68.72	$61.20 - $78.13
Q3 2013	77,325	$5,228	$60.15	$50.50 - $68.22
Q2 2013	80,997	$4,384	$48.72	$43.39 - $52.49