PDF SOLUTIONS INC

Ticker: PDFS CUSIP: 693282105 Class: Common Stock

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

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

Q1 2017

Shares 242,939 Value ($000) $5,495 Avg Close $22.28 Range $21.03 - $23.40

Q4 2016

Shares 232,043 Value ($000) $5,233 Avg Close $20.91 Range $17.45 - $24.44

Q4 2013

Shares 244,611 Value ($000) $6,267 Avg Close $22.99 Range $20.12 - $25.90

Q2 2013

Shares 204,225 Value ($000) $3,764 Avg Close $17.41 Range $14.95 - $19.03

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2017	242,939	$5,495	$22.28	$21.03 - $23.40
Q4 2016	232,043	$5,233	$20.91	$17.45 - $24.44
Q4 2013	244,611	$6,267	$22.99	$20.12 - $25.90
Q2 2013	204,225	$3,764	$17.41	$14.95 - $19.03