MESA LABS INC

Ticker: MLAB CUSIP: 59064R109 Class: Common Stock

Walleye Trading LLC's Holding History (CIK: 0001388391)

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

Q3 2018

Shares 80 Value ($000) $15 Avg Close $195.39 Range $165.11 - $218.31

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2018	80	$15	$195.39	$165.11 - $218.31