Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 406

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 406
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. Government regulation may change frequently and may have significant adverse consequences. Moreover, government regulation may have unpredictable and unintended effects. Actions by governmental entities may also impact certain instruments in which a Fund invests. For example, certain instruments in which a Fund may invest have relied on or will continue to rely in some fashion upon the London Interbank Offered Rate (“LIBOR”). LIBOR was traditionally an average interest rate, determined by the ICE Benchmark Administration, that banks charge one another for the use of short-term money. On March 5, 2021, the Financial Conduct Authority (“FCA”), the United Kingdom’s financial regulatory body and regulator of LIBOR, publicly announced that all U.S. Dollar LIBOR settings will either cease to be provided by any administrator or will no longer be representative (i) immediately after December 31, 2021 for one-week and two-month U.S. Dollar LIBOR settings and (ii) immediately after June 30, 2023 for the remaining U.S. Dollar LIBOR settings. As of January 1, 2022, as a result of supervisory guidance from U.S. regulators, U.S. regulated entities have generally ceased entering into new LIBOR contracts with limited exceptions. Publication of all Japanese yen and the one- and six-month sterling LIBOR settings have ceased, and while publication of the three-month Sterling LIBOR setting will continue through at least the end of March 2024 on the basis of a changed methodology (known as “synthetic LIBOR”), this rate has been designated by the FCA as unrepresentative of the underlying market that it seeks to measure and is solely available for use in legacy transactions. Certain bank-sponsored committees in other jurisdictions, including Europe, the United Kingdom, Japan and Switzerland, have selected alternative reference rates denominated in other currencies. Although the transition process away from LIBOR for many instruments has been completed, some LIBOR use is continuing and there are potential effects related to the transition away from LIBOR or continued use of LIBOR on the Fund, or

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on certain instruments in which the Fund invests, which can be difficult to ascertain, and may vary depending on factors that include, but are not limited to: (i) existing fallback or termination provisions in individual contracts and (ii) whether, how, and when industry participants adopt new reference rates for affected instruments. So-called “tough legacy” contracts have LIBOR interest rate provisions with no fallback provisions contemplating a permanent discontinuation of LIBOR, inadequate fallback provisions or fallback