Investor sentiment has been upbeat for months now, as markets are rebounding strongly from recent troughs. The gains are real, amounting to ~15% on the S&P 500 and 30% on the Nasdaq. A recent note from Wells Fargo, however, reminds investors to keep a disciplined stance – the bull, while real, may be more fragile than it looks. As the investment bank puts it, “Following the recent equity market rally, investors may have reason to be optimistic. On June 8, S&P 500 Index gains exceeded 20% from th