Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 258

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 258
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 to additional credit risks besides the issuer’s default, such as links to the defaults of other issuers, or has other structural features that warrant a different rating. In some circumstances, no rating may be assigned to a drawdown. Moody’s encourages market participants to contact Moody’s Ratings Desks or visit www.moodys.com directly if they have questions regarding ratings for specific notes issued under a medium-term note program. Unrated notes issued under an MTN program may be assigned an NR (not rated) symbol. Global Short-Term Rating Scale Ratings assigned on Moody’s global short-term rating scales are forward-looking opinions of the relative credit risks of financial obligations issued by non-financial corporates, financial institutions, structured finance vehicles, project finance vehicles, and public sector entities. Short-term ratings are assigned to obligations with an original maturity of thirteen months or less 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. Moody’s employs the following designations to indicate the relative repayment ability of rated issuers:

September 28, 2023 | Base Prospectus A-1

PIMCO Corporate & Income Opportunity Fund

P-1: Issuers (or supporting institutions) rated Prime-1 have a superior ability to repay short-term debt obligations. P-2: Issuers (or supporting institutions) rated Prime-2 have a strong ability to repay short-term debt obligations. P-3: Issuers (or supporting institutions) rated Prime-3 have an acceptable ability to repay short-term obligations. NP: Issuers (or supporting institutions) rated Not Prime do not fall within any of the Prime rating categories. National Scale Long-Term Ratings Moody’s long-term National Scale Ratings (NSRs) are opinions of the relative creditworthiness of issuers and financial obligations within a particular country. NSRs are not designed to be compared among countries; rather, they address relative credit risk within a given country. Moody’s assigns national scale ratings in certain local capital markets in which investors have found the global rating scale provides inadequate differentiation among credits or is inconsistent with a rating scale already in common use in the country. In each specific country, the last two characters of the rating indicate the country in which the issuer is located (e.g., Aaa.br for Brazil). Aaa.n: Issuers or issues rated Aaa.n demonstrate the strongest creditworthiness relative to other domestic issuers. Aa.n: Issuers or issues rated Aa.n demonstrate very strong