PDF SOLUTIONS INC

Ticker: PDFS CUSIP: 693282105 Class: Common Stock

Parallax Volatility Advisers, L.P.'s Holding History (CIK: 0001521001)

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

Q4 2017

Shares 4,200 Value ($000) $66 Avg Close $16.06 Range $14.12 - $18.48

Q1 2017

Shares 3,941 Value ($000) $89 Avg Close $22.28 Range $21.03 - $23.40

Q4 2016

Shares 3,019 Value ($000) $68 Avg Close $20.91 Range $17.45 - $24.44

Q3 2014

Shares 897 Value ($000) $11 Avg Close $19.84 Range $12.26 - $22.66

Q2 2014

Shares 571 Value ($000) $12 Avg Close $19.12 Range $16.60 - $21.77

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2017	4,200	$66	$16.06	$14.12 - $18.48
Q1 2017	3,941	$89	$22.28	$21.03 - $23.40
Q4 2016	3,019	$68	$20.91	$17.45 - $24.44
Q3 2014	897	$11	$19.84	$12.26 - $22.66
Q2 2014	571	$12	$19.12	$16.60 - $21.77