X0306 4 2021-12-10 0 0001412350 PIMCO Income Opportunity Fund PKO 0001694396 STRACKE THIBAULT CHRISTIAN C/O PIMCO 650 NEWPORT CENTER DRIVE NEWPORT BEACH CA 92660 0 0 0 1 SEE REMARKS COMMON SHARES 2021-12-10 4 D 0 36434.48 D 0 D 5,468.4867 shares were acquired under a qualified dividend reinvestment plan from March 12, 2020 to the filing of this Form 4. The shares of the Issuer were disposed of in exchange for shares of PIMCO Dynamic Income Fund ("PDI") in connection with the reorganization of the Issuer with and into PDI based on PDI's and the Issuer's respective net asset value per share at the time of the closing of such reorganization, which resulted in an exchange ratio of 0.949037. Pacific Investment Management Company LLC ("PIMCO") is the investment adviser of the Issuer. The Reporting Person is a Managing Director of this Issuer at PIMCO and a member of PIMCO's Executive Committee. /s/ Kevin Van Gorder, Attorney-in-Fact for Thibault Christian Stracke 2021-12-14