From mr7.ru, March 2015 (Google auto-translate from Russian):

“LLC “Internet Research” (TIN 7813585038) was founded in March 2014. The company acts as the successor to LLC “Internet Research Agency” (INN 7805627478), which was based in Olgino. The legal address of “Internet research”, according to commercial registers, is Bolshaya Raznochinnaya street, 17, room 1-N. The founder and general director is Michael Bystrov born in 1958, retired colonel of militia, former chief of the Ministry of Internal Affairs in Moscow district of St. Petersburg. According to Kommersant , in the 1990s, Mikhail Ivanovich stood at the origins of the Regional Office for Combating Organized Crime.

Wired, September 2017:

According to Russia researchers at the liberal advocacy group Center for American Progress, there’s reason to believe the Internet Research Agency is operating under a new name: Glavset.

A Russian tax filing reveals that Glavset, which launched in February 2015, operates out of the same office building—55 Savushkin Street in St. Petersburg—that once housed the Internet Research Agency. The filing lists Mikhail Ivanovich Bystrov, former head of the Internet Research Agency, as its general director.

Wikipedia IRA page:

“As of October 2014, the company belonged to Mikhail Bystrov, who had been the head of the police station at Moscow district of Saint Petersburg.[11]”

Masterandmargarita.eu (still don’t know what that site is):

The modern office building with four floors at the Savushkina ulitsa no. 55 in Saint Petersburg houses two similar companies. Besides the aforementioned Internet Research Agency, it also houses the Интернет исследования [Internet issledovaniya] or Internet Research, a company ran by Mikhail Bystrov, a former police officer from Saint Petersburg. This company also belongs to Yevgeny Prigoshin’s holding company Concord.