KEY POINTS
  • Former Goldman Sachs Asset Management Chairman Jim O'Neill says volatility is doing something it hasn't done for 10 years.
  • O'Neill says the extreme movement is a sign that an almost 10-year clear run of gains for stocks could end.

Former Goldman Sachs Asset Management Chairman Jim O'Neill told CNBC on Thursday that there are signs that a 10-year bull market in stocks is set to end.

Speaking at the Ambrosetti Workshop on the shores of Lake Como, near Milan, O'Neill told CNBC's Steve Sedgwick that the U.S. market was "definitely not cheap" and "very sensitive" to any bad news.