Fed Chair Janet Yellen was the latest policy maker to comment, calling equity valuations "somewhat rich."

Low volatility has yet to stress the ETF market, Global Trading Systems' Ari Rubenstein says.

Investors in actively managed U.S. equity funds pulled money out for the 51st time in the past 52 weeks.

A 14-week streak continued while nearly $38 billion has been put toward emerging market equity funds this year.

Precious metals and commodities continue to lose popularity, as real estate and health care funds continue longest run of inflows since late last year.

After a 31-week high of $24.5 billion, equity funds failed to crack $1 billion in the week ending June 21.

The increased scrutiny of plan fees and the need to offer low-cost investment choices are making TDFs attractive.

Volatility gauges have collapsed as policy uncertainty spikes.

The higher stocks climb, the worse the fall can be, TIAA's Nick says.

One can easily draw the parallel between a roller coaster ride and the risk we experience in equity markets.