SEC EDGAR Submission 0001104659-15-060098

<SEC-DOCUMENT>0001104659-15-060098-index.html : 20150814
<SEC-HEADER>0001104659-15-060098.hdr.sgml : 20150814
<ACCEPTANCE-DATETIME>20150814164601
ACCESSION NUMBER:		0001104659-15-060098
CONFORMED SUBMISSION TYPE:	425
PUBLIC DOCUMENT COUNT:		63
FILED AS OF DATE:		20150814
DATE AS OF CHANGE:		20150814

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:		151056637

	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>a15-17661_18k.htm
<DESCRIPTION>8-K
<TEXT>
Document 1 - file: a15-17661_18k.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>a15-17661_1ex99d1.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 2 - file: a15-17661_1ex99d1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g176611mmi001.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g176611mmi001.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g176611mmi002.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g176611mmi002.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g176611mmi003.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g176611mmi003.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g176611mmi004.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g176611mmi004.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g176611mmi005.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g176611mmi005.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g176611mmi006.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g176611mmi006.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g176611mmi007.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g176611mmi007.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>g176611mmi008.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: g176611mmi008.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>g176611mmi009.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: g176611mmi009.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>12
<FILENAME>g176611mmi010.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 12 - file: g176611mmi010.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>13
<FILENAME>g176611mmi011.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 13 - file: g176611mmi011.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>14
<FILENAME>g176611mmi012.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 14 - file: g176611mmi012.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>15
<FILENAME>g176611mmi013.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 15 - file: g176611mmi013.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>16
<FILENAME>g176611mmi014.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 16 - file: g176611mmi014.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>17
<FILENAME>g176611mmi015.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 17 - file: g176611mmi015.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>18
<FILENAME>g176611mmi016.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 18 - file: g176611mmi016.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>19
<FILENAME>g176611mmi017.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 19 - file: g176611mmi017.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>20
<FILENAME>g176611mmi018.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 20 - file: g176611mmi018.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>21
<FILENAME>g176611mmi019.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 21 - file: g176611mmi019.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>22
<FILENAME>g176611mmi020.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 22 - file: g176611mmi020.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>23
<FILENAME>g176611mmi021.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 23 - file: g176611mmi021.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>24
<FILENAME>g176611mmi022.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 24 - file: g176611mmi022.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>25
<FILENAME>g176611mmi023.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 25 - file: g176611mmi023.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>26
<FILENAME>g176611mmi024.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 26 - file: g176611mmi024.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>27
<FILENAME>g176611mmi025.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 27 - file: g176611mmi025.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>28
<FILENAME>g176611mmi026.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 28 - file: g176611mmi026.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>29
<FILENAME>g176611mmi027.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 29 - file: g176611mmi027.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>30
<FILENAME>g176611mmi028.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 30 - file: g176611mmi028.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>31
<FILENAME>g176611mmi029.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 31 - file: g176611mmi029.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>32
<FILENAME>g176611mmi030.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 32 - file: g176611mmi030.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>33
<FILENAME>g176611mmi031.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 33 - file: g176611mmi031.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>34
<FILENAME>g176611mmi032.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 34 - file: g176611mmi032.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>35
<FILENAME>g176611mmi033.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 35 - file: g176611mmi033.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>36
<FILENAME>g176611mmi034.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 36 - file: g176611mmi034.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>37
<FILENAME>g176611mmi035.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 37 - file: g176611mmi035.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>38
<FILENAME>g176611mmi036.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 38 - file: g176611mmi036.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>39
<FILENAME>g176611mmi037.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 39 - file: g176611mmi037.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>40
<FILENAME>g176611mmi038.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 40 - file: g176611mmi038.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>41
<FILENAME>g176611mmi039.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 41 - file: g176611mmi039.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>42
<FILENAME>g176611mmi040.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 42 - file: g176611mmi040.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>43
<FILENAME>g176611mmi041.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 43 - file: g176611mmi041.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>44
<FILENAME>g176611mmi042.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 44 - file: g176611mmi042.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>45
<FILENAME>g176611mmi043.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 45 - file: g176611mmi043.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>46
<FILENAME>g176611mmi044.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 46 - file: g176611mmi044.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>47
<FILENAME>g176611mmi045.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 47 - file: g176611mmi045.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>48
<FILENAME>g176611mmi046.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 48 - file: g176611mmi046.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>49
<FILENAME>g176611mmi047.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 49 - file: g176611mmi047.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>50
<FILENAME>g176611mmi048.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 50 - file: g176611mmi048.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>51
<FILENAME>g176611mmi049.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 51 - file: g176611mmi049.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>52
<FILENAME>g176611mmi050.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 52 - file: g176611mmi050.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>53
<FILENAME>g176611mmi051.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 53 - file: g176611mmi051.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>54
<FILENAME>g176611mmi052.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 54 - file: g176611mmi052.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>55
<FILENAME>g176611mmi053.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 55 - file: g176611mmi053.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>56
<FILENAME>g176611mmi054.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 56 - file: g176611mmi054.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>57
<FILENAME>g176611mmi055.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 57 - file: g176611mmi055.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>58
<FILENAME>g176611mmi056.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 58 - file: g176611mmi056.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>59
<FILENAME>g176611mmi057.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 59 - file: g176611mmi057.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>60
<FILENAME>g176611mmi058.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 60 - file: g176611mmi058.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>61
<FILENAME>g176611mmi059.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 61 - file: g176611mmi059.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>62
<FILENAME>g176611mmi060.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 62 - file: g176611mmi060.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>63
<FILENAME>g176611mmi061.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 63 - file: g176611mmi061.gif

</DOCUMENT>
</SEC-DOCUMENT>