<SEC-DOCUMENT>0000940400-18-000103-index.html : 20180129 <SEC-HEADER>0000940400-18-000103.hdr.sgml : 20180129 <ACCEPTANCE-DATETIME>20180129154358 ACCESSION NUMBER: 0000940400-18-000103 CONFORMED SUBMISSION TYPE: NSAR-B PUBLIC DOCUMENT COUNT: 3 CONFORMED PERIOD OF REPORT: 20171130 FILED AS OF DATE: 20180129 DATE AS OF CHANGE: 20180129 EFFECTIVENESS DATE: 20180129 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: NSAR-B SEC ACT: 1940 Act SEC FILE NUMBER: 811-06495 FILM NUMBER: 18555388 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>NSAR-B <SEQUENCE>1 <FILENAME>pfoanwserfile.fil <TEXT> Document 1 - file: pfoanwserfile.fil
</DOCUMENT> <DOCUMENT> <TYPE>EX-99.77B ACCT LTTR <SEQUENCE>2 <FILENAME>FCNSARLetter77B.txt <TEXT> Document 2 - file: FCNSARLetter77B.txt
</DOCUMENT> <DOCUMENT> <TYPE>EX-99.77Q2 ITEM 405 <SEQUENCE>3 <FILENAME>PFO77Q2.txt <TEXT> Document 3 - file: PFO77Q2.txt
</DOCUMENT> </SEC-DOCUMENT>