Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 269

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 269
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 current principal and related interest. RR2: Superior recovery prospects given default . ‘RR2’ rated securities have characteristics consistent with securities historically recovering 71%-90% of current principal and related interest. RR3: Good recovery prospects given default . ‘RR3’ rated securities have characteristics consistent with securities historically recovering 51%-70% of current principal and related interest. RR4: Average recovery prospects given default . ‘RR4’ rated securities have characteristics consistent with securities historically recovering 31%-50% of current principal and related interest. RR5: Below average recovery prospects given default . ‘RR5’ rated securities have characteristics consistent with securities historically recovering 11%-30% of current principal and related interest. RR6: Poor recovery prospects given default . ‘RR6’ rated securities have characteristics consistent with securities historically recovering 0%-10% of current principal and related interest. Short-Term Credit Ratings A short-term issuer or obligation rating is based in all cases on the short-term vulnerability to default of the rated entity and relates to the capacity to meet financial obligations in accordance with the documentation governing the relevant obligation. Short-term deposit ratings may be adjusted for loss severity. Short-Term Ratings are assigned to obligations whose initial maturity is viewed as “short term”

A-6 Base Prospectus | PIMCO Corporate & Income Opportunity Fund

Base Prospectus

based on market convention. Typically, this means up to 13 months for corporate, sovereign, and structured obligations, and up to 36 months for obligations in U.S. public finance markets. F1: Highest short-term credit quality. Indicates the strongest intrinsic capacity for timely payment of financial commitments; may have an added “+” to denote any exceptionally strong credit feature. F2: Good short-term credit quality. Good intrinsic capacity for timely payment of financial commitments. F3: Fair short-term credit quality. The intrinsic capacity for timely payment of financial commitments is adequate. B: Speculative short-term credit quality. Minimal capacity for timely payment of financial commitments, plus heightened vulnerability to near term adverse changes in financial and economic conditions. C: High short-term default risk. Default is a real possibility. RD: Restricted default. Indicates an entity that has defaulted on one or more of its financial commitments, although it continues to meet other financial obligations. Typically applicable to entity ratings only. D: Default. Indicates a broad-based default event for an entity, or the default of a short-term obligation.

September 28, 2023 | Base Prospectus A-7

PIMCO Corporate