PDF SOLUTIONS INC

Ticker: PDFS CUSIP: 693282105 Class: Common Stock

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

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

Q3 2019

Shares 13,136 Value ($000) $172 Avg Close $12.62 Range $11.16 - $13.84

Q2 2019

Shares 9,723 Value ($000) $128 Avg Close $12.83 Range $11.77 - $14.00

Q2 2017

Shares 5,181 Value ($000) $85 Avg Close $18.56 Range $16.07 - $23.93

Q2 2016

Shares 800 Value ($000) $11 Avg Close $13.59 Range $12.09 - $15.25

Q4 2015

Shares 800 Value ($000) $9 Avg Close $10.84 Range $9.68 - $11.76

Q3 2015

Shares 13,200 Value ($000) $132 Avg Close $12.57 Range $9.91 - $16.45

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2019	13,136	$172	$12.62	$11.16 - $13.84
Q2 2019	9,723	$128	$12.83	$11.77 - $14.00
Q2 2017	5,181	$85	$18.56	$16.07 - $23.93
Q2 2016	800	$11	$13.59	$12.09 - $15.25
Q4 2015	800	$9	$10.84	$9.68 - $11.76
Q3 2015	13,200	$132	$12.57	$9.91 - $16.45