The case comes amid a year-long probe into former President Yoon Suk Yeol's brief imposition of martial law last year and related scandals linked to the once-powerful couple.
The Seoul Central District Court is due to deliver its verdict on January 28.
At a trial held on the first anniversary of Yoon's martial law declaration, prosecutors delivered their final arguments on Kim's charges including stock manipulation, violating political fundraising laws by asking a power broker to carry out free opinion polling, as well as accepting bribes from the Unification Church.
Kim, dressed in a black suit, apologised to the public for causing concerns. She has denied wrongdoing.
(Reporting by Heejin Kim; Writing by Joyce LeeEditing by Ed Davies)
SSouth Korea's former first lady Kim Keon Hee (L) enters a courtroom at the Seoul Central District Court in Seoul, South Korea, 24 September 2025, to attend the first hearing of her corruption trial following her indictment on charges of stock manipulation, bribery and other corruption. EPA/YONHAP / POOL SOUTH KOREA OUT