Extract the dates of change of ownership and who the new owner was

Context: The company was founded in 2006. The aim of the company is to develop Synterra's media projects. In September, 2009 Synterra Group of Companies got operational control of Synterra Media as GC bought 40,01% stocks. GC "Synterra" owns 60% of "Synterra Media". That gives GC the right to make decisions on further development of this project.

In 2010, Megafon under the leadership of Sergey Soldatenkov gained control of Synterra Media with a 60% stake and spun off to Rostelecom several assets including RTKomm.ru, Telecom-Center and Globus-Telecom.

On 22 October 2020, PJSC Rostelecom agreed to buy a 100% stake in ZAO Synterra Media from MTT for 1.5 billion rubles which allows MTT to focus on the integration of real-time telecom services or Unified Communications and Telecom API. Synterra delivers and distributes media content from the event venues to the television broadcasting companies such as Channel One, VGTRK, NTV, Russia Today, TV Center, Match TV. Both directly and through its subsidiaries, MTT had consolidated its 100% stake in Synterra Media in 2013. As of 2014, MTT, which has 25 million subscribers, competes with Inoventika for cloud computing.

Answer: 2009 - Synterra Group of Companies
2010 - Megafon
October 22, 2020 - PJSC Rostelecom