Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 256

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 256
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2) of the 1940 Act and Sections 13 and 15(d) of the Exchange Act, as well as this Prospectus and the Statement of Additional Information, are available on the Fund’s website http://www.pimco.com/prospectuses. In addition, the SEC maintains a website at www.sec.gov, free of charge that contains these reports, the Fund’s proxy and information statements, and other information relating to the Fund.

100 Base Prospectus | PIMCO Corporate & Income Opportunity Fund

Base Prospectus

Appendix A Description of Securities Ratings The Fund‘s investments may range in quality from securities rated in the lowest category in which the Fund is permitted to invest to securities rated in the highest category (as rated by Moody’s, Standard & Poor’s or Fitch, or, if unrated, determined by PIMCO to be of comparable quality). The percentage of the Fund‘s assets invested in securities in a particular rating category will vary. The following terms are generally used to describe the credit quality of fixed income securities: High Quality Debt Securities are those rated in one of the two highest rating categories (the highest category for commercial paper) or, if unrated, deemed comparable by PIMCO. Investment Grade Debt Securities are those rated in one of the four highest rating categories, or if unrated deemed comparable by PIMCO. Below Investment Grade High Yield Securities (“Junk Bonds”), are those rated lower than Baa by Moody’s, BBB by Standard & Poor’s or Fitch, and comparable securities. They are deemed predominantly speculative with respect to the issuer’s ability to repay principal and interest. The following is a description of Moody’s, Standard & Poor’s and Fitch’s rating categories applicable to fixed income securities. Moody’s Investors Service, Inc. Global Long-Term Rating Scale Ratings assigned on Moody’s global long-term rating scales are forward-looking opinions of the relative credit risks of financial obligations issued by non-financial corporations, financial institutions, structured finance vehicles, project finance vehicles, and public sector entities. Long-term ratings are assigned to issuers or obligations with an original maturity of one year or more and reflect both on the likelihood of a default or impairment on contractual financial obligations and the expected financial loss suffered in the event of default or impairment. Aaa: Obligations rated Aaa are judged to be of the highest quality, subject to the lowest level of credit risk. Aa: Obligations rated Aa are judged to be of high quality and are subject to very low credit risk. A