<SEC-DOCUMENT>0001193125-17-346944-index.html : 20171117
<SEC-HEADER>0001193125-17-346944.hdr.sgml : 20171117
<ACCEPTANCE-DATETIME>20171117160632
ACCESSION NUMBER:		0001193125-17-346944
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20171117
DATE AS OF CHANGE:		20171117
GROUP MEMBERS:		J. BRYAN KING
GROUP MEMBERS:		J. LUTHER KING, JR.
GROUP MEMBERS:		LKCM CORE DISCIPLINE, L.P.
GROUP MEMBERS:		LKCM MICRO-CAP PARTNERSHIP, L.P.
GROUP MEMBERS:		LKCM PRIVATE DISCIPLINE MASTER FUND, SPC

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CECO ENVIRONMENTAL CORP
		CENTRAL INDEX KEY:			0000003197
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL & COMMERCIAL FANS & BLOWERS & AIR PURIFYING EQUIP [3564]
		IRS NUMBER:				132566064
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-19763
		FILM NUMBER:		171211009

	BUSINESS ADDRESS:	
		STREET 1:		14651 NORTH DALLAS PARKWAY
		STREET 2:		SUITE 500
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75254
		BUSINESS PHONE:		(513) 458-2600

	MAIL ADDRESS:	
		STREET 1:		4625 RED BANK ROAD
		STREET 2:		SUITE 200
		CITY:			CINCINNATI
		STATE:			OH
		ZIP:			45227

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	API ENTERPRISES INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALARM PRODUCTS INTERNATIONAL INC
		DATE OF NAME CHANGE:	19851210

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KING LUTHER CAPITAL MANAGEMENT CORP
		CENTRAL INDEX KEY:			0000310051
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				75163030
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	BUSINESS ADDRESS:	
		STREET 1:		301 COMMERCE SUITE 1600
		CITY:			FORT WORTH
		STATE:			TX
		ZIP:			76102
		BUSINESS PHONE:		8173323235

	MAIL ADDRESS:	
		STREET 1:		301 COMMERCE SUITE 1600
		CITY:			FORT WORTH
		STATE:			TX
		ZIP:			76102
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>d497429dsc13da.htm
<DESCRIPTION>SC 13D/A
<TEXT>
Document 1 - file: d497429dsc13da.htm

</DOCUMENT>
</SEC-DOCUMENT>