X0306 4 2019-12-17 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 STOCK 2019-12-17 4 P 0 3000 27.602 A 23379 D The price reported in Column 4 is a weighted average price. The shares purchased in multiple transactions at prices ranging from $27.59 to $27.62, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this Form 4. Includes approximately 1,368 shares acquired on various dates under a qualified dividend reinvestment plan since the last Form 4 filed by the Reporting Person. 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 2019-12-19