<SEC-DOCUMENT>0000912562-18-000010.txt : 20180412
<SEC-HEADER>0000912562-18-000010.hdr.sgml : 20180412
<ACCEPTANCE-DATETIME>20180412163612
ACCESSION NUMBER:		0000912562-18-000010
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20180412
DATE AS OF CHANGE:		20180412
EFFECTIVENESS DATE:		20180412

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GIBRALTAR INDUSTRIES, INC.
		CENTRAL INDEX KEY:			0000912562
		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES & ROLLING & FINISHING MILLS [3310]
		IRS NUMBER:				161445150
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-22462
		FILM NUMBER:		18752433

	BUSINESS ADDRESS:	
		STREET 1:		3556 LAKE SHORE ROAD
		STREET 2:		P O BOX 2028
		CITY:			BUFFALO
		STATE:			NY
		ZIP:			14219-0228
		BUSINESS PHONE:		7168266500

	MAIL ADDRESS:	
		STREET 1:		GATEWAY EXECUTIVE PARK
		STREET 2:		3556 LAKE SHORE ROAD PO BOX 2028
		CITY:			BUFFALO
		STATE:			NY
		ZIP:			14219-0228

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GIBRALTAR STEEL CORP
		DATE OF NAME CHANGE:	19930924
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>a2018supplementtoproxystat.htm
<DESCRIPTION>DEFA14A
<TEXT>
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<div><a name="s4a5a0a152c394f44a82c2b71eb18968b"></a></div><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">UNITED STATES</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">SECURITIES AND EXCHANGE COMMISSION</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">WASHINGTON,&#160;D.C. 20549</font></div><div style="line-height:120%;padding-top:6px;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">SCHEDULE 14A</font></div><div style="line-height:120%;padding-top:6px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">EXCHANGE ACT OF 1934 (Amendment No.&#160;&#160;&#160;&#160;)</font></div><div style="line-height:120%;padding-top:6px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Filed by the Registrant&#160;&#160;</font><font style="font-family:Wingdings;font-size:10pt;">&#254;</font></div><div style="line-height:120%;padding-top:6px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Filed by a Party other than the Registrant&#160;&#160;</font><font style="font-family:Wingdings;font-size:10pt;">&#168;</font></div><div style="line-height:120%;padding-top:6px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Check the appropriate box:</font></div><div style="line-height:120%;padding-top:6px;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:99.609375%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:4%;"></td><td style="width:96%;"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:Wingdings;font-size:10pt;">&#168;</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Preliminary Proxy Statement</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:Wingdings;font-size:10pt;">&#168;</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:Wingdings;font-size:10pt;">&#168;</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Definitive Proxy Statement</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:Wingdings;font-size:10pt;">&#254;</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Definitive Additional Materials</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:Wingdings;font-size:10pt;">&#168;</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Soliciting Material under&#160;&#167;240.14a-12</font></div></td></tr></table></div></div><div style="line-height:120%;padding-top:6px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;text-decoration:underline;">Gibraltar Industries, Inc.</font></div><div style="line-height:120%;text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">(Name of Registrant as Specified In Its Charter)</font></div><div style="line-height:120%;text-align:justify;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">_________________________________________________________________________________________________________________</font></div><div style="line-height:120%;padding-bottom:2px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div><div style="line-height:120%;text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</font></div><div style="line-height:120%;padding-top:6px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Payment of Filing Fee (Check the appropriate box):</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:5%;"></td><td style="width:95%;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:6px;text-align:justify;font-size:10pt;"><font style="font-family:Wingdings;font-size:10pt;">&#254;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">No fee required</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:left;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:5%;"></td><td style="width:95%;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:Wingdings;font-size:10pt;">&#168;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Fee computed on table below per Exchange Act Rules&#160;14a-6(i)(1) and 0-11</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:left;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:6%;"></td><td style="width:5%;"></td><td style="width:89%;"></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(1)</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Title of each class of securities to which transaction applies:</font></div></td></tr><tr><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(2)</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Aggregate number of securities to which transaction applies:</font></div></td></tr><tr><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(3)</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule&#160;0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):</font></div></td></tr><tr><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(4)</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Proposed maximum aggregate value of transaction:</font></div></td></tr><tr><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">&#160;&#160;&#160;&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(5)</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Total fee paid:</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:left;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:5%;"></td><td style="width:95%;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:Wingdings;font-size:10pt;">&#168;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Fee paid previously with preliminary materials.</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:left;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:99.609375%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:5%;"></td><td style="width:95%;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:Wingdings;font-size:10pt;">&#168;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:4px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Check box if any part of the fee is offset as provided by Exchange Act Rule&#160;0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:left;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:7%;"></td><td style="width:5%;"></td><td style="width:88%;"></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(1)</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Amount Previously Paid:</font></div></td></tr><tr><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">&#160;&#160;&#160;&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(2)</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Form, Schedule or Registration Statement No.:</font></div></td></tr><tr><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">&#160;&#160;&#160;&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(3)</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Filing Party:</font></div></td></tr><tr><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">&#160;&#160;&#160;&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(4)</font></div></td><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:3pt;"><font style="font-family:inherit;font-size:3pt;">&#160;</font></div><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Date Filed:</font></div></td></tr><tr><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">&#160;&#160;&#160;&#160;</font></div></td></tr></table></div></div><div style="line-height:120%;"><hr></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><a name="sbd0db3985db04a0b904cf5f3a1f7f249"></a></div><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">GIBRALTAR INDUSTRIES, INC.</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">3556 Lake Shore Road</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">PO&#160;Box&#160;2028</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Buffalo, New York 14219-0228</font></div><div style="line-height:120%;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">&#160;</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">SUPPLEMENT TO THE PROXY STATEMENT</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">For the Annual Meeting of Stockholders</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">To be Held on May 4, 2018</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:9pt;">&#160;</font><font style="font-family:inherit;font-size:10pt;">&#160;</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following information relates to the proxy statement (the "Proxy Statement") of Gibraltar Industries, Inc. (the "Company"), dated March 27, 2018, furnished to stockholders of the Company in connection with the solicitation of proxies by the Board of Directors of the Company (the "Board") for the 2018 Annual Meeting of Stockholders and any adjournment or postponement thereof (the "Annual Meeting"), to be held at the Gateway Building, 3556 Lake Shore Road, Buffalo, NY 14219, on Friday, May 4, 2018, at 11:00 a.m. Eastern Time.  All capitalized terms used in this supplement to the Proxy Statement (the "Supplement") and not otherwise defined herein have the meaning ascribed to them in the Proxy Statement.</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><a name="sa926ad7e87e444ca880dc656156485fa"></a></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">THIS SUPPLEMENT SHOULD BE READ IN CONJUNCTION</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">WITH THE PROXY STATEMENT.</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Supplemental Disclosure Concerning Proposal 3</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">As disclosed in the Proxy Statement, the Company is seeking stockholder approval at the Annual Meeting to approve the Gibraltar Industries, Inc. 2018 Equity Incentive Plan (the "2018 Equity Incentive Plan") which provides for the issuance of up to 1,000,000 shares of Common Stock as described in Proposal 3.</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Eligible Participants</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The individuals that are eligible to receive awards under the 2018 Equity Incentive Plan are officers and other employees of the Company and its subsidiaries, non-employee Directors of the Company and other independent advisors of the Company.</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">As of April 12, 2018, we expect that 4 officers and approximately 100 employees of the Company and its subsidiaries will be eligible to receive awards under the 2018 Equity Incentive Plan.  We do not currently expect to issue awards to non-employee directors or other independent advisors of the Company.</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The basis for participation in the 2018 Equity Incentive Plan is the Committee's decision, in its sole discretion, that an award to an eligible participant will further the 2018 Equity Incentive Plan's purposes.  In exercising its discretion, the Committee will consider the recommendations of management and the purpose of the 2018 Equity Incentive Plan, which is to provide stock-based compensation to employees and non-employee directors to promote close alignment among the interest of employees, directors and stockholders.  Under the 2018 Equity Incentive Plan, awards are structured to vest either solely over time or, in the case of performance-based awards, over time but only upon achievement of one or more performance criteria, provided herein.  We believe the awards align employees interests with that of stockholders and will promote continuity in management and the employee base.</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Non-Qualified Options</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">There are currently no federal income tax consequences to either the participant or the Company upon the grant of a non-qualified option.  Upon the exercise of a non-qualified option, the participant will recognize ordinary compensation income in an amount equal to the excess of the fair market value of each share on the date of exercise over the option price, and the Company generally will be entitled to a federal income tax deduction in the same amount.  Special rules apply to a participant who exercises a non-qualified option by paying the exercise price, in whole or in part, by the transfer of shares of previously owned Gibraltar Industries, Inc. Common Stock.</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Any vote previously entered, either by mailing a proxy card, over the internet or by telephone, "FOR" or "AGAINST" the 2018 Equity Incentive Plan will be counted as a vote "FOR" or "AGAINST" the 2018 Equity Incentive Plan.  If you have already returned your proxy card or voted your proxy over the internet or by telephone, and would like to change your vote on any matter, you may revoke your proxy by (1) entering a new vote by mail, over the internet or by telephone before the Annual Meeting, or (2) attending the Annual Meeting and voting in person.  If you hold your shares through a broker, bank, or other nominee, you must contact them in order to find out how to change your vote.</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">THE BOARD OF DIRECTORS UNAMIOUSLY RECOMMENDS A VOTE "FOR" APPROVAL OF THE GIBRALTAR INDUSTRIES, INC. 2018 EQUITY INCENTIVE PLAN.</font></div><div><br></div><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><div><br></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">This Supplement is first being released to stockholders on or about April 12, 2018 and should be read together with the Proxy Statement.  The information contained in this Supplement to the Proxy Statement modifies or supersedes any inconsistent information contained in the Proxy Statement.</font></div><div><br></div><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div>	</body>
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