Exhibit a.9

PIMCO CORPORATE & INCOME OPPORTUNITY FUND

NOTICE OF CHANGE OF TRUSTEES

WHEREAS, PIMCO Corporate & Income Opportunity Fund (the “Trust”) is organized as a trust under the laws of the Commonwealth of Massachusetts; and

WHEREAS, the Board nominated and appointed Joseph B. Kittredge, Jr. as a Trustee of the Trust, effective as of June 11, 2020;

NOW, THEREFORE, as a result of the foregoing Trustee nomination and appointment, the nine (9) Trustees of the Trust are:

Sarah E. Cogan	1633 Broadway
	New York, New York 10019
Deborah A. DeCotis	1633 Broadway
	New York, New York 10019
David N. Fisher	650 Newport Center Drive Newport Beach, CA 92660
James A. Jacobson	1633 Broadway
	New York, New York 10019
Hans W. Kertess	1633 Broadway
	New York, New York 10019
Joseph B. Kittredge, Jr.	1633 Broadway
	New York, New York 10019
John C. Maney	650 Newport Center Drive
	Newport Beach, CA 92660
William B. Ogden, IV	1633 Broadway
	New York, New York 10019
Alan Rappaport	1633 Broadway
	New York, New York 10019

IN WITNESS WHEREOF, this Notice has been subscribed this 9^th day of July, 2020, by the undersigned who affirms that the statements made herein are true under the penalties of perjury.

/s/ Ryan Leshaw

Ryan Leshaw, Chief Legal Officer

Signature Page – PIMCO Corporate & Income Opportunity Fund (PTY)