ON Media (known until November 25, 2025 as MTS Media) is a Russian entertainment holding created in February 2024 to consolidate the entertainment businesses of the digital ecosystem operated by MTS (Mobile TeleSystems), Russia’s largest mobile operator. The holding includes the KION streaming platform, the KIONFILM studio, the MTS Music streaming service, the Строки (Stroki) book service, the MTS Label record company, and the MTS Live events and ticketing division. ON Media briefly operated under a broader non-telecom holding structure called Erion, itself a late-2025 rebrand of what had been known as “MTS Ecosystem,” though that holding structure was reported to be under dissolution as of February 2026, with ON Media continuing to operate as an individual business. ON Media is led by general director Sofya Mitrofanova, who previously held senior roles at Gazprom-Media Holding, Okko, Ivi, and Premier.