Why Costco stock tumbled over 4% despite strong June sales

Costco shares fell more than 4 percent despite reporting June net sales of about 29.24 billion dollars, up 10.6 percent year on year. Investors focused on the slowest monthly growth since February and easing comparable sales, compounded by the stock's premium valuation and fading fuel-price tailwinds. Analysts noted that while fundamentals remain solid, elevated expectations leave little margin for any moderation in growth.