The trial began on 6 December 2016. The Prosecution and the Defence have completed the presentation of their evidence. The Legal Representatives of Victims also called witnesses to appear before the Chamber. On 12 December 2019, the presiding judge declared the closure of the submission of evidence in the case. The closing briefs were filed on 24 February 2020. The closing statements took place from 10 to 12 March 2020. On 4 February 2021, Trial Chamber IX, composed of Judge Bertram Schmitt (Presiding), Judge Peter Kovacs and Judge Raul C. Pangalangan, found Dominic Ongwen guilty for a total of 61 crimes comprising crimes against humanity and war crimes, committed in Northern Uganda between 1 July 2002 and 31 December 2005. On 6 May 2021, Trial Chamber IX sentenced Dominic Ongwen to 25 years of imprisonment. 

On 15 December 2022, the Appeals Chamber confirmed the decisions of Trial Chamber IX on Dominic Ongwen’s guilt and sentence. On 18 December 2023, Mr Ongwen was transferred to Norway to serve his sentence of imprisonment. 

On 28 February 2024, Trial Chamber IX delivered its Order on Reparations to victims. On 7 April 2025, the Appeals Chamber rejected Mr Dominic Ongwen’s appeal against the Order on Reparations and confirmed the Trial Chamber’s decision.