As the stock market continues to rise this year, investors are increasingly concerned that their ability to sell shares will vanish, according to firms listed in Institutional Investor’s 2017 All-America Trading Team rankings. II spotlights the top electronic, high-touch, and portfolio trading teams along with the best firms providing unique market color to the buy side. Rankings were determined by tallying more than 15,700 votes cast by some of the most influential institutional investors.