"Billionaire Igor Makarov is also the largest shareholder in Calgary-based natural gas producer Spartan Delta Corp., a company with a C$1.3-billion ($1 billion) market value. "

Read More

"This measurement of concentration most likely is an understatement since we cannot rule out that some of the largest addresses are controlled by the same entity," researchers Igor Makarov and Antoinette Schoar wrote."

Read More