MESA LABS INC

Ticker: MLAB CUSIP: 59064R109 Class: Common Stock

Artisan Partners Limited Partnership's Holding History (CIK: 0001466153)

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

Q4 2020

Shares 130,892 Value ($000) $37,519 Avg Close $268.73 Range $247.92 - $285.33

Q3 2020

Shares 127,906 Value ($000) $32,585 Avg Close $231.93 Range $202.54 - $252.24

Q2 2020

Shares 131,870 Value ($000) $28,589 Avg Close $224.85 Range $197.47 - $262.51

Q1 2020

Shares 89,386 Value ($000) $20,209 Avg Close $240.43 Range $177.40 - $264.58

Q4 2019

Shares 89,617 Value ($000) $22,350 Avg Close $228.21 Range $201.87 - $248.54

Q3 2019

Shares 69,652 Value ($000) $16,561 Avg Close $225.06 Range $200.11 - $261.29

Q2 2019

Shares 65,896 Value ($000) $16,101 Avg Close $226.56 Range $176.37 - $256.07

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2020	130,892	$37,519	$268.73	$247.92 - $285.33
Q3 2020	127,906	$32,585	$231.93	$202.54 - $252.24
Q2 2020	131,870	$28,589	$224.85	$197.47 - $262.51
Q1 2020	89,386	$20,209	$240.43	$177.40 - $264.58
Q4 2019	89,617	$22,350	$228.21	$201.87 - $248.54
Q3 2019	69,652	$16,561	$225.06	$200.11 - $261.29
Q2 2019	65,896	$16,101	$226.56	$176.37 - $256.07