[3] For his sophomore season, he transferred to Our Savior New American School in Centereach, New York and averaged 25 points, five rebounds, and five assists per game.

[4] In January 2019, Kuminga was named most valuable player of the Slam Dunk to the Beach showcase after scoring 40 points, a single-game record at the event, in a loss to Gonzaga College High School.

[4] After the season, Kuminga averaged 20.8 points, 5.2 rebounds and 3.3 assists per game for the NY Rens at the Nike Elite Youth Basketball League, facing many players older than him.

He scored 43 points, shooting 7 of 11 from three-point range, against the Texas Titans, a team featuring top recruits Cade Cunningham and Greg Brown.

[20] On October 30, Kuminga made his NBA debut, putting up three points and one steal in a 103–82 win over the Oklahoma City Thunder.

[30] In August 2022, Kuminga joined the DR Congo men's national basketball team for the African 2023 World Cup qualifiers.

[32] Kuminga's older brother, Joel Ntambwe, played college basketball for UNLV before transferring to Texas Tech in 2019.

[1][33] Two of his cousins play professional basketball: Emmanuel Mudiay in Puerto Rico,[34] and Omari Gudul in Europe.