During the COVID-19 lockdown, the
Deutsche Kammerphilharmonie Bremen invited Peltokoski for a guest-conducting engagement in late 2020, at the suggestion of
Pekka Kuusisto and Iiro Rantala. Peltokoski first guest-conducted the orchestra in a public concert in June 2021. In January 2022, the orchestra appointed Peltokoski its principal guest conductor, the first conductor to be granted that title in the orchestra's history. In January 2022, Peltokoski first guest-conducted the
Latvian National Symphony Orchestra (LNSO). In May 2022, the LNSO announced the appointment of Peltokoski as its next music director and artistic director, effective with the 2022–2023 season. In May 2022, Peltokoski first guest-conducted the
Rotterdam Philharmonic Orchestra (RPhO). On the basis of this appearance, the RPhO announced the appointment of Peltokoski as its next principal guest conductor, effective with the 2023–2024 season, with an initial contract of 4 years. In September 2022, Peltokoski first guest-conducted the
Orchestre national du Capitole de Toulouse. He returned for an additional guest-conducting appearance in October 2022. In December 2022, the Orchestre national du Capitole de Toulouse announced the appointment of Peltokoski as its next music director, effective with the 2025-2026 season, with an initial contract of four seasons. He held the title of music director-designate for the 2024-2025 season. In January 2023, Peltokoski made his guest-conducting debuts in North America with the
San Diego Symphony In October 2023, Peltokoski signed a recording contract with
Deutsche Grammophon (DG). His debut album for DG was released in May 2024, with the Deutsche Kammerphilharmonie Bremen, in recordings of Mozart symphonies. Peltokoski first guest-conducted the
Hong Kong Philharmonic Orchestra in June 2023. In July 2024, the orchestra announced the appointment of Peltokoski as its next music director, effective with the 2026-2027 season, with an initial contract of four years. He is to hold the title of music director-designate for the 2025-2026 season. In March 2024,
Classic FM selected Peltokoski as one of their 30 'Rising Stars' of the year. ==Selected compositions==