PDF SOLUTIONS INC

Ticker: PDFS CUSIP: 693282105 Class: Common Stock

MARTINGALE ASSET MANAGEMENT L P's Holding History (CIK: 0000936944)

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

Q4 2015

Shares 43,569 Value ($000) $473 Avg Close $10.84 Range $9.68 - $11.76

Q3 2015

Shares 36,891 Value ($000) $369 Avg Close $12.57 Range $9.91 - $16.45

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2015	43,569	$473	$10.84	$9.68 - $11.76
Q3 2015	36,891	$369	$12.57	$9.91 - $16.45