Costco Wholesale (NASDAQ: COST) has been a great stock for shareholders, delivering a market-beating return of 150% over the past five years -- and the giant retailer is still winning fans on Wall Street following its latest earnings results in May.

Goldman Sachs and a few other top Wall Street companies have maintained buy ratings on the shares. Most analysts are bullish, with a price target as high as $635. Goldman sees the stock trading up to $545 in the short term.

Costco is seeing growing customer traffic and memberships, but the level of sales growth doesn't seem to justify a 20-year-high valuation. Let's take a closer look.

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Source Fool.com