MESA LABS INC

Ticker: MLAB CUSIP: 59064R109 Class: Common Stock

CASTLEARK MANAGEMENT LLC's Holding History (CIK: 0001106832)

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

Q1 2020

Shares 28,451 Value ($000) $6,432 Avg Close $240.43 Range $177.40 - $264.58

Q4 2019

Shares 27,321 Value ($000) $6,814 Avg Close $228.21 Range $201.87 - $248.54

Q3 2019

Shares 32,275 Value ($000) $7,674 Avg Close $225.06 Range $200.11 - $261.29

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2020	28,451	$6,432	$240.43	$177.40 - $264.58
Q4 2019	27,321	$6,814	$228.21	$201.87 - $248.54
Q3 2019	32,275	$7,674	$225.06	$200.11 - $261.29