Sergey Solonin, CEO of large payment service provider QIWI, has recently revealed in a lecture at Moscow Advanced Communication School that his CTO had mined 500,000 bitcoins back in 2011. The employee used QIWI terminals that were idle at night to make more than $5 mln in three months.
Read the details in the article of Coinidol dot com, the world blockchain news outlet: https://coinidol.com/cto-of-qiwi-controlled-2-4-of-worlds-bitcoin-emission/