13D Filing: King Luther Capital Management Corp and CECO Environmental Corp (CECE)

---

This Amendment No. 1 to Schedule 13D amends and supplements the Schedule 13D filed by the Reporting Persons
with respect to the Common Stock, par value $0.01 per share (Common Stock), of CECO Environmental Corp., a Delaware corporation (the Issuer). Except as set forth below, all previous Items remain unchanged. Capitalized terms
used herein but not defined herein shall have the meanings given to them in the Schedule 13D, as amended, filed with the Securities and Exchange Commission. Each of the Reporting Persons hereby expressly disclaims membership in a group
under the Securities Exchange Act of 1934 with respect to the securities reported herein, and this Schedule 13D shall not be deemed to be an admission that any such Reporting Person is a member of such a group. Each of the Reporting Persons hereby
expressly disclaims beneficial ownership of the securities reported herein, other than to the extent of its pecuniary interest therein, and this Schedule 13D shall not be deemed to be an admission that any such Reporting Person is the beneficial
owner of the securities reported herein for purposes of the Securities Exchange Act of 1934 or for any other purpose.

Item 3. Source and
Amount of Funds or Other Consideration

Item 3 is hereby supplemented as follows:

PDP acquired additional 110,000 shares of Common Stock in open market transactions for an aggregate purchase price of approximately $1,034,000 using working
capital.

Item 5. Interest in Securities of the Issuer

Item 5 is hereby amended and restated as follows:

(a) As of October 13, 2017, the Reporting Persons may be deemed to beneficially own 1,701,689 shares of Common Stock (which represents approximately 4.9%
of the outstanding Common Stock based upon information contained in the Issuers Form 10-Q for the period ended June 30, 2017).

(b)

		Sole Voting Power				Shared Voting Power				Sole Dispositive Power				Shared Dispositive Power
PDP			1,622,887				0				1,622,887				0
Micro			51,939				0				51,939				0
Core			19,363				0				19,363				0
LIP			0				0				0				0
LIP2			0				0				0				0
LKCM			1,695,989				0				1,695,989				0
J. Luther King, Jr.			1,701,689				0				1,701,689				0
J. Bryan King			1,694,189				0				1,694,189				0

(c) During the past sixty days, the Reporting Persons sold the following shares of Common Stock in open market transactions.

Date		Reporting Person				Shares Sold				Price
8/29/2017			LIP2				1,210			$	7.1999
9/20/2017			LIP				10,230			$	8.1291
9/25/2017			LIP				20,000			$	8.4565

(d) Not applicable.

(e) As of
October 13, 2017, the Reporting Persons no longer are the beneficial owners of five percent of the outstanding Common Stock.