Flows into the biggest exchange-traded fund tracking the companies have been positive for six of the last seven weeks and totaled $238 million last month, the most since July.
ETF investors may help stabilize the market because they tend to hold assets longer than hedge funds and large speculators who are more likely to react faster to events.
Over the decades, active mutual funds have gotten fat on big fees, investor ignorance and a rising market that let people overlook the costs. That era is over.