Costco Stock's Premium Rests On A Visit Rate That Keeps Slowing
The comp still looks strong, but the part of it that comes from members actually walking in has more than halved in a year, and that visit rate is what a growth-stock multiple on a warehouse retailer is really underwriting.
Costco Wholesale (COST) grew net sales by 11.6% in fiscal Q3 2026, faster than its own trailing four-quarter pace, and the stock has gone nowhere for a year. Both facts point to the same number, and it is not on the income statement. It is how often members actually walk into a warehouse.
Traffic, or shopping frequency, rose 2.4% worldwide in fiscal Q3 2026, after 3.1% in fiscal Q2 2026 and 5.2% in fiscal Q3 2025. Visit growth has more than halved over the past year. Management does not dispute the path, calling it a normalization from a stretch a year or so earlier when visits grew mid-single digits, and says traffic is still growing healthily.
Revenue is not the scare. Costco compounded revenue at about 9.5% a year over five years and 7.6% over three, and grew 9.2% over the past twelve months, so the multi-year pace has stayed in a narrow band. Growth that steady is one of the properties the Trefis High Quality Portfolio favors in its holdings. Costco's growth rate has held, but the mix inside it has not: management says basket size was flat to slightly negative a year or so ago and has since risen. Comparable sales rose 9.8% in fiscal Q3 2026, and 6.6% adjusted for gas price inflation and currency.
Split that 6.6%: worldwide visits contributed 2.4 points, and a larger average ticket contributed 4.2 points excluding gas price inflation and currency; that ticket was up 7.3% worldwide before those adjustments. Roughly two-thirds of the comp came from members spending more per trip rather than coming more often.
By the company's own account, the fix is physical, not merchandising: land bought beside existing sites to widen parking lots, more capacity at gas stations, faster checkout so a parking space turns over sooner, and infill locations that relieve pressure on nearby clubs. Costco ended fiscal Q3 2026 with 928 warehouses, and it now expects 26 net new openings, two fewer than planned, with those two now landing in fiscal 2027, against a stated target of 30-plus a year. Record gas volumes drove many members to use the gas stations for the very first time, and gas visits are not counted in the traffic figure, though management says it has not seen a dramatic change in third-quarter traffic overall as a result.
Costco trades at 46.9 times trailing earnings , within a ten-year range of 26.8 to 56.0, on a 3.0% net margin that is its own best in at least five years. That is a growth-stock multiple on a consumer staples retailer. The stock's flat twelve months came while the S&P 500 returned 20.5%, and the shares sit about 14% below the 52-week high. This is a risk to weigh, not an exit: the multiple is high but still inside its own ten-year range, near the top of it. The open question is whether worldwide traffic growth stops falling once the widened parking lots and infill openings arrive. For now, whether this counts as a dip worth buying is the question a dip-buyer's screen is built to answer.
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