PDF SOLUTIONS INC

Ticker: PDFS CUSIP: 693282105 Class: Common Stock

ESSEX INVESTMENT MANAGEMENT CO LLC's Holding History (CIK: 0000201772)

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

Q2 2013

Shares 29,123 Value ($000) $537 Avg Close $17.41 Range $14.95 - $19.03

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2013	29,123	$537	$17.41	$14.95 - $19.03