Flaherty & Crumrine PREFERRED & INCOME OPPORTUNITY FUND INC

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Flaherty & Crumrine PREFERRED & INCOME OPPORTUNITY FUND INC

PFO·NYSE·Unknown·CIK 0000882071

Flaherty & Crumrine Preferred Income Opportunity Fund Inc. is a closed-ended equity mutual fund. The fund is managed by Flaherty & Crumrine Incorporated and invests in the public equity markets of the United States. It focuses on stocks of companies within the financial services sector, primarily investing in preferred securities. The fund benchmarks its performance against the S&P 500 Index and the Barclays Capital U.S. Aggregate Index. Flaherty & Crumrine Preferred Income Opportunity Fund Inc. was formed on December 10, 1991, and is domiciled in the United States.

Flaherty & Crumrine PREFERRED & INCOME OPPORTUNITY FUND INC (NYSE:PFO) is a publicly traded company in the Unknown sector.

Short Interest & Short Volume

2.47 days to cover

FINRA reported short interest of 53,204 shares in PFO as of the September 15, 2026 settlement, a 225.4% increase from the prior period — about 2.5 days to cover at its recent average daily volume. On October 2, 2026, 11.6% of PFO volume reported to FINRA trade-reporting facilities was marked short.

Short interest (bi-monthly positions)53,204 shares as of September 15, 2026

Change vs prior period▲ 225.4%

Days to cover2.47 at avg daily volume of 21,556

Daily short volume (FINRA facilities)11.6% of 24,442 shares on October 2, 2026

5-day average short volume29.9%

Daily short sale volume covers trades reported to FINRA trade-reporting facilities and is not the same as short interest (bi-monthly reported positions). Source: FINRA — FINRA is the owner and source of this short interest and short sale volume data; it may not be redistributed.

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