For the past two years, the market has treated Costco like a company that had cracked the retail code.

Renewal rates above 90%. Membership growth every quarter. A subscriber base so loyal it barely noticed a fee increase. The narrative wrote itself: Costco is untouchable.

Then last Thursday, Costco posted strong Q3 results, beat on revenue, beat on earnings, 11.6% sales growth, and the stock fell anyway.

Here is the thing. That drop was not a surprise. It was the only logical outcome for a stock priced at 50 times forward earnings.

And honestly? When the market punishes a great quarter, it is not telling you something went wrong with the business. It is telling you what the price already assumed had to go right.

Today in This Week's Focus, we are getting into the real story: what the numbers say, what the market is actually reacting to, and whether this pullback to the 200-day moving average is the entry long-term investors have been waiting for.

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Costco just delivered one of the best retail quarters in recent memory.

Revenue up 11.6% to $70.53 billion. Earnings per share up 15.2%. Comparable sales up 9.8%. Every number the street cares about moved in the right direction.

The stock fell anyway. That gap between the result and the reaction is exactly what this newsletter is here to examine.

82.9 million paid members. 148.5 million total cardholders. A worldwide renewal rate of 89.7%, and 92.2% in the US and Canada.

That renewal rate is not a vanity metric. It is a revenue floor.

Membership fee income hit $1.37 billion for the quarter, up from $1.24 billion a year ago. Because that money lands before Costco sells a single item, it funds the low-price model that keeps members renewing year after year.

That is the flywheel. And it is still spinning.

Digitally enabled comparable sales grew 21.5% in Q3, with app and website traffic up 37% year over year. Operating cash flow for the first 36 weeks sits at $11.13 billion. This is not a retailer muddling through. It is a cash machine with a subscription engine underneath it.

One detail most coverage missed: Costco's gas stations just had their five highest volume weeks ever in the final stretch of the quarter. Because consumers have been hunting for cheaper fuel amid Middle East tensions, Costco's below-market prices pulled in record traffic. That boosted comp sales but also skewed the gross margin line, which matters for understanding the bear case.

Heading into earnings, COST was trading at roughly 50 times forward earnings. Walmart sits closer to 30 times. The S&P 500 as a whole is around 22 times.

Not a slight premium. A structural one.

At 50x, the market is not paying for what Costco is today. It is paying for what Costco has to become over the next several years, without a stumble, without a quarter that misses, without a margin that slips.

The Q3 revenue beat was real. But gross margin fell 0.21% to 11.04%. Management made the deliberate call to absorb cost pressure on everyday fresh items like beef and eggs rather than pass it on to members. That is the right long-term decision. It is not the margin expansion story the market was pricing in.

That is the Costco paradox. The same discipline that makes this business resilient is what keeps compressing the margin line quarter after quarter.

Paid memberships grew 4.1% for the quarter. Healthy in absolute terms. But the year-over-year growth rate in new sign-ups has edged lower, with management attributing the softness to a temporary lull in new warehouse openings in major markets.

Not every slowdown is structural. But at 50x earnings, even a temporary softening in a key growth metric gives the market permission to sell.

The tariff picture adds a second layer. CEO Ron Vachris confirmed Costco has submitted tariff refund claims following the Supreme Court ruling and expects refunds to arrive on a rolling basis. He said the company plans to return a portion of savings to members. That is a member-first message. It is also margin uncertainty on the income statement until the refunds actually show up.

Two friction points sitting on top of a stock that had zero room for friction priced in. That is why the quarter got sold.

Down roughly 13% from the all-time high of $1,096.50 hit on May 19, 2026.

Support: $952 (200-day MA), then $940 and $927 below. Resistance: $983 to $998, then $1,015 above.

COST broke below its 50-day MA on earnings and is now testing the 200-day. That level held during the April selloff. It is the line that matters most right now.

A clean bounce off the 200-day with volume is constructive. A daily close below $940 changes the setup entirely.

At current levels, the forward P/E compresses to roughly 46 to 47 times. Still demanding. But the most reasonable entry point this stock has offered in over a year.

The membership line holds the valuation together. If annual fee revenue growth stays above 10%, the premium has a foundation. Because membership income is the highest-margin line Costco runs, it subsidises the low-price model that drives renewals. Any deceleration here is the one signal that genuinely challenges the entire bull case.

Management cited slower sign-up growth due to a lull in new warehouse openings. The Q4 earnings call in late July is the next moment to listen for pipeline updates. Because each new warehouse is not just a store. It is a membership acquisition engine dropped into a market that has not yet been touched.

Costco expects tariff refunds to arrive on a rolling basis through the rest of the fiscal year. If those land in Q4 and the company retains even a portion, margin compression partially reverses. That is the upside the current price does not reflect. That is the number to watch when Q4 results come out.

Digitally enabled comparable sales grew 21.5% in Q3. If that rate continues to accelerate, the valuation story shifts from "expensive retailer" to "omnichannel subscription platform growing at tech-company rates." Because at that growth rate, 50x starts to look less like a stretched multiple and more like a platform premium.

COST is sitting right on the 200-day MA at approximately $952. This level held in April. If it holds again, the technical setup for a recovery toward $998 to $1,015 is clean. A close below $940 brings the next support at $927 into play, representing roughly a 15% drawdown from the all-time high and a forward P/E closer to 43 to 44 times. That is where the long-term entry case gets genuinely hard to argue against.

The cruelest thing the market can do to a great company is price it perfectly. That is exactly what happened to Costco last Thursday.

The business did not disappoint. The valuation did.

Costco runs one of the most defensible models in retail. 82.9 million paying members. A 92.2% renewal rate in the US and Canada. A low-price flywheel that gets stronger when consumers are under pressure, not weaker. These are not marketing lines. They are structural advantages that took decades to build and would take decades to dismantle.

But none of that saves you when the stock is at 50 times forward earnings and gross margin comes in 0.21% light.

At that multiple, "very good" gets sold. Only flawless gets rewarded.

Here is what I think is really happening. The market is not re-rating Costco as a worse business. It is re-rating the price investors were willing to pay for certainty. In an environment with Middle East tensions, tariff uncertainty, and a consumer whose savings rate is falling, paying 50x for a retailer with 11% gross margins starts to feel like too much faith in too straight a line.

The pullback to the 200-day MA is the first time in over a year that the price and the business have started to make sense together.

Not a screaming buy at $945. The most interesting entry this stock has offered in twelve months, in a business that has earned the right to be held for the next decade.

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Most investors assume a earnings beat means the stock goes up.

Sometimes it does. But at high enough valuations, earnings can only do two things: confirm what was already priced in, or fall short of it.

Costco confirmed a strong business. It could not confirm a perfect one.

There is a broader principle in that. Every stock has a price at which even great execution is not enough. The question is never just whether the company is good. It is whether the price already assumes it is.

When you pay for perfection, you do not get rewarded for excellent. You get punished for anything less.