<SEC-DOCUMENT>0000814375-15-000028-index.html : 20150203
<SEC-HEADER>0000814375-15-000028.hdr.sgml : 20150203
<ACCEPTANCE-DATETIME>20150202180518
ACCESSION NUMBER:		0000814375-15-000028
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20150203
DATE AS OF CHANGE:		20150202

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MATTSON TECHNOLOGY INC
		CENTRAL INDEX KEY:			0000928421
		STANDARD INDUSTRIAL CLASSIFICATION:	SPECIAL INDUSTRY MACHINERY, NEC [3559]
		IRS NUMBER:				770208119
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-46189
		FILM NUMBER:		15568599

	BUSINESS ADDRESS:	
		STREET 1:		47131 BAYSIDE PARKWAY
		CITY:			FREMONT
		STATE:			CA
		ZIP:			94538
		BUSINESS PHONE:		510 657 5900

	MAIL ADDRESS:	
		STREET 1:		47131 BAYSIDE PARKWAY
		CITY:			FREMONT
		STATE:			CA
		ZIP:			94538

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DONALD SMITH & CO., INC.
		CENTRAL INDEX KEY:			0000814375
		IRS NUMBER:				132807845
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		152 W. 57TH STREET
		STREET 2:		22ND FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019
		BUSINESS PHONE:		212-284-0990

	MAIL ADDRESS:	
		STREET 1:		152 W. 57TH STREET
		STREET 2:		22ND FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SMITH DONALD & CO INC /NJ/
		DATE OF NAME CHANGE:	19990329
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>mattsonless14.txt
<DESCRIPTION>DECEMBER 31, 2014 13-G FILING
<TEXT>
Document 1 - file: mattsonless14.txt

</DOCUMENT>
</SEC-DOCUMENT>