If you’ve chosen a target asset allocation—the mix of stocks, bonds, and cash in your portfolio— you’re probably ahead of many investors. But unless you’re investing in a set-and-forget investment option like a target-date fund, your portfolio’s asset mix will shift as the market fluctuates. In a bull market you might get more equity exposure […] If you’ve chosen a target asset allocation—the mix of stocks, bonds, and cash in your portfolio— you’re probably ahead of many investors. But unless you’re investing in a set-and-forget investment option like a target-date fund, your portfolio’s asset mix will shift as the market fluctuates. In a bull market you might get more equity exposure than you planned, or the reverse if the market declines.