<SEC-DOCUMENT>0001387131-20-006927-index.html : 20200731 <SEC-HEADER>0001387131-20-006927.hdr.sgml : 20200731 <ACCEPTANCE-DATETIME>20200731102210 ACCESSION NUMBER: 0001387131-20-006927 CONFORMED SUBMISSION TYPE: N-CSRS PUBLIC DOCUMENT COUNT: 7 CONFORMED PERIOD OF REPORT: 20200531 FILED AS OF DATE: 20200731 DATE AS OF CHANGE: 20200731 EFFECTIVENESS DATE: 20200731 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-CSRS SEC ACT: 1940 Act SEC FILE NUMBER: 811-06495 FILM NUMBER: 201064190 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 800 STREET 2: C/O FLAHERTY & CRUMRINE INC CITY: PASADENA STATE: CA ZIP: 91101 FORMER COMPANY: FORMER CONFORMED NAME: Flaherty & Crumrine PREFERRED INCOME OPPORTUNITY FUND INC DATE OF NAME CHANGE: 20050708 FORMER COMPANY: FORMER CONFORMED NAME: PREFERRED INCOME OPPORTUNITY FUND INC DATE OF NAME CHANGE: 19920929 </SEC-HEADER> <DOCUMENT> <TYPE>N-CSRS <SEQUENCE>1 <FILENAME>pfo-ncsrs_053120.htm <DESCRIPTION>CERTIFIED SEMI-ANNUAL SHAREHOLDER REPORT <TEXT> Document 1 - file: pfo-ncsrs_053120.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>EX-99.906 CERT <SEQUENCE>3 <FILENAME>ex99-906cert.htm <DESCRIPTION>SECTION 906 CERTIFICATIONS <TEXT> Document 3 - file: ex99-906cert.htm
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>4 <FILENAME>pfo-ncsrs_053120img001.gif <DESCRIPTION>GRAPHIC <TEXT> Document 4 - file: pfo-ncsrs_053120img001.gif
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>5 <FILENAME>pfo-ncsrs_053120img002.gif <DESCRIPTION>GRAPHIC <TEXT> Document 5 - file: pfo-ncsrs_053120img002.gif
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>6 <FILENAME>pfo-ncsrs_053120img003.gif <DESCRIPTION>GRAPHIC <TEXT> Document 6 - file: pfo-ncsrs_053120img003.gif
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>7 <FILENAME>pfo-ncsrs_053120img004.gif <DESCRIPTION>GRAPHIC <TEXT> Document 7 - file: pfo-ncsrs_053120img004.gif
</DOCUMENT> </SEC-DOCUMENT>