<SEC-DOCUMENT>0001104659-15-015451-index.html : 20150302
<SEC-HEADER>0001104659-15-015451.hdr.sgml : 20150302
<ACCEPTANCE-DATETIME>20150302070035
ACCESSION NUMBER:		0001104659-15-015451
CONFORMED SUBMISSION TYPE:	425
PUBLIC DOCUMENT COUNT:		17
FILED AS OF DATE:		20150302
DATE AS OF CHANGE:		20150302

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SQUARE 1 FINANCIAL INC
		CENTRAL INDEX KEY:			0001329799
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		425
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36372
		FILM NUMBER:		15662260

	BUSINESS ADDRESS:	
		STREET 1:		406 BLACKWELL STREET
		STREET 2:		SUITE 240
		CITY:			DURHAM
		STATE:			NC
		ZIP:			27701
		BUSINESS PHONE:		919-314-3040

	MAIL ADDRESS:	
		STREET 1:		406 BLACKWELL STREET
		STREET 2:		SUITE 240
		CITY:			DURHAM
		STATE:			NC
		ZIP:			27701

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Square 1 Financial Inc
		DATE OF NAME CHANGE:	20050609

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PACWEST BANCORP
		CENTRAL INDEX KEY:			0001102112
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		IRS NUMBER:				330885320
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		425

	BUSINESS ADDRESS:	
		STREET 1:		6110 EL TORDO
		CITY:			RANCHO SANTA FE
		STATE:			CA
		ZIP:			92067
		BUSINESS PHONE:		8587563023

	MAIL ADDRESS:	
		STREET 1:		275 NORTH BREA BLVD
		CITY:			BREA
		STATE:			CA
		ZIP:			92821

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FIRST COMMUNITY BANCORP /CA/
		DATE OF NAME CHANGE:	19991229
</SEC-HEADER>
<DOCUMENT>
<TYPE>425
<SEQUENCE>1
<FILENAME>a15-5665_18k.htm
<DESCRIPTION>8-K
<TEXT>
Document 1 - file: a15-5665_18k.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>a15-5665_1ex99d1.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 2 - file: a15-5665_1ex99d1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.2
<SEQUENCE>3
<FILENAME>a15-5665_1ex99d2.htm
<DESCRIPTION>EX-99.2
<TEXT>
Document 3 - file: a15-5665_1ex99d2.htm

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<SEQUENCE>4
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<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g56651moi001.gif

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Document 5 - file: g56651moi002.gif

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Document 6 - file: g56651moi003.jpg

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<TEXT>
Document 7 - file: g56651moi004.jpg

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Document 8 - file: g56651moi005.gif

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Document 9 - file: g56651moi006.gif

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<SEQUENCE>10
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Document 10 - file: g56651moi007.gif

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Document 11 - file: g56651moi008.jpg

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Document 12 - file: g56651moi009.gif

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Document 13 - file: g56651moi010.gif

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<SEQUENCE>14
<FILENAME>g56651moi011.gif
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<TEXT>
Document 14 - file: g56651moi011.gif

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<TYPE>GRAPHIC
<SEQUENCE>15
<FILENAME>g56651moi012.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 15 - file: g56651moi012.gif

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<SEQUENCE>16
<FILENAME>g56651moi013.gif
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Document 16 - file: g56651moi013.gif

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Document 17 - file: g56651moi014.gif

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