John Brennan co-founded Sirios Capital Management in 1999, a Boston-based hedge fund. John Brennan's track record at MFS Investment Management, where he pushed MFS's Opportunities Fund to a 5-star ranking, in addition to the sheer size of the $2.3 billion Sirios Capital, makes him a fund manager worth watching.
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John Brennan Bio, Returns, AUM, Net Worth
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