SEOUL, South Korea (AP) -- South Korea's top court Thursday upheld the acquittal of Samsung Electronics Chairman Lee Jae-yong on financial criminal charges, ending years of legal disputes over the 2015 merger between Samsung affiliates that solidified his control over the company.

In 2024, the Seoul Central District Court acquitted Lee of charges like stock price manipulation and accounting fraud by ruling that prosecutors failed to sufficiently prove the merger was unlawfully conducted with an aim to strengthen Lee's control over Samsung.

The Seoul High Court upheld the district court's ruling in February, and the Supreme Court dismissed prosecutors' appeal of the high court's decision Thursday. Its ruling is final and cannot be appealed.

Samsung's lawyers said in a statement that they "sincerely thank" the Supreme Court for "wisely" ruling on the case. They said the ruling confirmed the 2015 merger was legitimate.

Lee, a third-generation corporate heir who was officially appointed chairman of Samsung Electronics in 2022, has led the Samsung group of companies since 2014, when his late father, Lee Kun-hee, suffered a heart attack. The senior Lee died in 2020.

Lee Jae-yong served 18 months in prison after being convicted in 2017 on separate bribery charges related to the 2015 merger.

He was originally sentenced to five years in prison for offering bribes to then-President Park Geun-hye and her close confidante to win government support for the merger, which was key to strengthening his control over the Samsung business empire and solidifying the father-to-son leadership succession.

Lee was paroled in 2021 and pardoned by then-President Yoon Suk Yeol in 2022.

Some shareholders opposed the 2015 merger, saying it unfairly benefited the Lee family while hurting minority shareholders.