Josh Brown , one of Wall Street's most recognizable financial advisers, said the rise of passive investing has created demand for a different kind of product: a concentrated portfolio aimed at capturing the market's biggest winners. The CEO of Ritholtz Wealth Management and CNBC contributor recently launched Porterhouse, a separately managed account named after the premium cut of steak and built to hold what he considers the market's best opportunities. The rules-based momentum strategy, run in