<SEC-DOCUMENT>0001387131-18-002478-index.html : 20180531
<SEC-HEADER>0001387131-18-002478.hdr.sgml : 20180531
<ACCEPTANCE-DATETIME>20180531163951
ACCESSION NUMBER:		0001387131-18-002478
CONFORMED SUBMISSION TYPE:	40-17G
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20180531
DATE AS OF CHANGE:		20180531
EFFECTIVENESS DATE:		20180531

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Flaherty & Crumrine PREFERRED INCOME OPPORTUNITY FUND INC
		CENTRAL INDEX KEY:			0000882071
		IRS NUMBER:				954355600
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1130

	FILING VALUES:
		FORM TYPE:		40-17G
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-06495
		FILM NUMBER:		18872168

	BUSINESS ADDRESS:	
		STREET 1:		301 E COLORADO BLVD STE 720
		STREET 2:		C/O FLAHERTY & CRUMRINE INC
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101
		BUSINESS PHONE:		(626) 795-7300

	MAIL ADDRESS:	
		STREET 1:		301 COLORADO BLVD STE 720
		STREET 2:		C/O FLAHERTY & CRUMRINE INC
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PREFERRED INCOME OPPORTUNITY FUND INC
		DATE OF NAME CHANGE:	19920929
</SEC-HEADER>
<DOCUMENT>
<TYPE>40-17G
<SEQUENCE>1
<FILENAME>pfo-4017g_051518.htm
<DESCRIPTION>FIDELITY BOND
<TEXT>
Document 1 - file: pfo-4017g_051518.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>pfo-cover_img001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: pfo-cover_img001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>p82302720001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: p82302720001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>p82302720002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: p82302720002.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>p82302720003.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: p82302720003.jpg

</DOCUMENT>
</SEC-DOCUMENT>