While the S&P 500 Index fell 1 percent last week, stocks with the highest hedge fund or exchanged-traded fund ownership posted losses that were four times larger, a study from UBS Group AG showed. Broadly, equity returns have been inversely tied to their popularity with funds. That is, the more loved by hedge funds or ETFs, the bigger the drop. Shares remained under pressure Monday, with the S&P 500 down 0.6 percent for its biggest three-day drop since June. The Nasdaq 100 fell 1.5 percent, pushing its loss since Thursday past 5 percent.