<SEC-DOCUMENT>0001387131-18-005682-index.html : 20181026 <SEC-HEADER>0001387131-18-005682.hdr.sgml : 20181026 <ACCEPTANCE-DATETIME>20181026160454 ACCESSION NUMBER: 0001387131-18-005682 CONFORMED SUBMISSION TYPE: N-Q PUBLIC DOCUMENT COUNT: 4 CONFORMED PERIOD OF REPORT: 20180831 FILED AS OF DATE: 20181026 DATE AS OF CHANGE: 20181026 EFFECTIVENESS DATE: 20181026 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: N-Q SEC ACT: 1940 Act SEC FILE NUMBER: 811-06495 FILM NUMBER: 181141689 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>N-Q <SEQUENCE>1 <FILENAME>pfo-nq_083118.htm <DESCRIPTION>QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS <TEXT> Document 1 - file: pfo-nq_083118.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-99.CERT <SEQUENCE>2 <FILENAME>ex99-cert.htm <DESCRIPTION>CERTIFICATIONS <TEXT> Document 2 - file: ex99-cert.htm
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>3 <FILENAME>pfo-nq_083118img001.gif <DESCRIPTION>GRAPHIC <TEXT> Document 3 - file: pfo-nq_083118img001.gif
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>4 <FILENAME>pfo-nq_083118img002.gif <DESCRIPTION>GRAPHIC <TEXT> Document 4 - file: pfo-nq_083118img002.gif
</DOCUMENT> </SEC-DOCUMENT>