Mattson Technology Inc

ESSEX INVESTMENT MANAGEMENT CO LLC

Report date

6/30/2014

Quarter

2014 Q2

Filed

7/23/2014

Shares

406,584

Value ($000)

890

Weight

0.1%

2013 Q4 - 2014 Q2 (3 filings)

Shares History

History scope: non-option holdings only (PUT/CALL rows excluded).

All 13F Holders	Filing date	Value ($000s)	% of Holdings	Shares	Reporting period
2014 Q2	7/23/2014	890	0.1%	406,584	6/30/2014
2014 Q1	4/28/2014	859	0.1%	370,394	3/31/2014
2013 Q4	1/28/2014	911	0.1%	332,590	12/31/2013