Berkshire Hathaway (BRK.A, $323,700.06) Took a $4 Billion Stake in JPMorgan (JPM, $107.33)

Berkshire Hathaway has made a $4 billion investment in JPMorgan Chase last quarter, as revealed by regulatory filings posted Wednesday.

Berkshire’s CEO Warren Buffett had expressed his keen interest in JPMorgan earlier this year in an interview with Yahoo Finance, when he indicated that he felt he should’ve invested sooner. "I should've [invested]," Buffett said. "Very obviously. I mean, it's been a terrifically run operation. And it was very cheap, just like a number of others were."

As per latest reports, Berkshire also grew its investment in several banks such as Bank of America, BNY Mellon, US Bancorp and Goldman Sachs.

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Sergey Savastiouk|Expert

Sergey Savastiouk, Ph.D. has a degree in Applied Mathematics from Moscow University and has extensive experience as an entrepreneur, investor, manager, and mathematician. His professional expertise is in applied mathematics, mathematical modeling, system and pattern analysis, and software and hardware system integration. He has served as the CEO of several hi-tech start-up companies and nonprofit organizations, which has given him proven capabilities in business strategy for high-tech start-up companies, market assessment, company formation, team building, product development, marketing, and sales. He has published numerous articles in journals and magazines on related fields. As a retail investor, he spent 15 years developing his proprietary trading and quantitative algorithms (now Tickeron’s A.I.), which brought him significant returns in trading the stock market. His current work and goal in founding Tickeron is to bring professional, sophisticated stock market analysis capabilities to retail investors via an easy-to-use interface.