Are Stitch Fix's Sales Secretly Soaring?

Stitch Fix (NASDAQ: SFIX) has mostly missed out on the market rally in recent weeks.

After a disappointing earnings report in March, shares of the personalized online styling service hovered near all-time lows for several weeks, but the stock has suddenly picked up momentum over the past couple of weeks. Shares rose as much as 58% from May 4, peaking at $24.10 on May 15.

There's been no clear reason for the gains. Stitch Fix hasn't made any announcements. It hasn't gotten any analyst upgrades, and there's been little macroeconomic news that would affect it, other than the slow reopening of states.