Prospectus [Rule 424(b)(3)]

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Filed Pursuant to Rule 424(b)(3 )
Registration No. 333-210467

The information contained in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to these securities has been declared effective by the Securities and Exchange Commission. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell the shares and are not soliciting an offer to buy the shares in any jurisdiction where the offer or sale is not permitted.

Subject to Completion, Dated December 11, 2017

PRELIMINARY PROSPECTUS SUPPLEMENT
To Prospectus dated April 8, 2016

7,150,000 Shares

[GRAPHIC MISSING]

NCI Building Systems, Inc.

Common Stock



All of the shares of common stock of NCI Building Systems, Inc., which we refer to in this prospectus supplement as “NCI” or the “Company,” being offered hereby are being sold by the selling stockholders identified in this prospectus supplement. NCI will not receive any of the proceeds from the sale of the shares being sold by the selling stockholders. We have agreed to bear all the expenses in connection with the registration of these shares. The selling stockholders will pay any applicable underwriting fees, discounts or commission and certain transfer taxes.

The common stock of NCI is listed on the New York Stock Exchange (the “NYSE”) under the symbol “NCS.” The last reported sale price of the common stock on December 11, 2017 was $20.60 per share.

Investing in our common stock involves risks. See “Risk Factors” on page S- 8 of this prospectus supplement and page 2 of the accompanying prospectus to read about factors you should consider before buying shares of the common stock.

Neither the U.S. Securities and Exchange Commission (the “SEC”) nor any other regulatory

The above information was disclosed in a filing to the SEC. To see the filing, click here.

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Other recent filings from the company include the following:

Major owner of NCI Building Systems just declared owning 18,981,188 shares of NCI Building Systems - Nov. 23, 2018
GGC Opportunity Fund Management GP, Ltd. just provided an update on activist position in NCI Building Systems - Nov. 23, 2018
Major owner of NCI Building Systems just declared owning 18,981,188 shares of NCI Building Systems - Nov. 23, 2018
President of NCI Building Systems just picked up 95,049 shares - Nov. 20, 2018
SVP of NCI Building Systems just picked up 30,408 shares - Nov. 20, 2018

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