How We Analyze Costco

How we analyze Costco: the business first

How we analyze Costco is the way we analyze any company: business quality first, then the balance sheet, then valuation, then the long-term record. None of those four steps is optional, and the order is deliberate. Costco Wholesale runs membership warehouses across the United States and a dozen other countries, selling a tightly edited range of goods in bulk at prices most rivals cannot match. You can follow along in the live Costco report on Tenet, which pulls the same figures we use below.

The first thing to understand is that Costco is not really trying to make money on the products it sells. In fiscal 2025 it reported gross margin near 12.8 percent of total revenue, and closer to 11 percent measured against merchandise sales alone. A typical retailer would consider that unsurvivable. For Costco it is the entire point, and the reason it works is the membership card.

The membership model and why thin margins are the moat

Costco makes most of its profit from membership fees, not from a markup on goods. In fiscal 2025 membership fee income was roughly $5.3 billion, according to the company's 10-K. Set that against operating income of about $10.4 billion for the year and the picture is stark: membership fees supply about half of operating profit, and the entire warehouse operation runs at close to break-even on the merchandise itself.

That structure creates a loop that is hard for competitors to break. Costco buys in enormous volume, keeps its markups deliberately low, and passes the savings to members as low prices. Low prices bring members back often, and frequent visits make the annual fee feel worth paying again. The renewal is where the profit lives.

The evidence that the loop is working is the renewal rate. Costco has reported renewal rates around 90 percent in the United States and Canada, and in the low 90s worldwide, sustained for years. When nine of every ten members choose to pay again, you are looking at a business whose customers believe they are getting more back than they put in. That is the moat, and it shows up as a number rather than a slogan.

Thin margins protect that moat in a way fat margins never could. A retailer earning a rich markup invites competitors to undercut it. Costco has almost no markup left to compete away, so a rival trying to win on price has to lose money to do it. The narrow margin is not a weakness to be fixed. It is the wall around the business. This is the kind of durable edge covered in identifying competitive advantages (moats), and Costco is close to a textbook case of it.

Two more features reinforce the model. The private-label brand, Kirkland Signature, gives Costco a high-quality product it controls end to end, which deepens member loyalty and improves buying power. And the limited selection, a few thousand items rather than tens of thousands, means each product sells in huge volume, which lowers costs further. The retail question of how a warehouse like this compares with a conventional store is worked through in how to analyze a retail business.

Balance-sheet strength: a fortress that funds itself

Costco carries one of the sturdiest balance sheets in retail, which matters because it lets the company expand and pay members' trust forward without leaning on lenders. At the end of fiscal 2025 it held about $15.3 billion in cash and short-term investments against roughly $8.2 billion of total debt, a net cash position of about $7 billion. A retailer that owes less than it holds in cash has enormous freedom in a downturn.

The quality of the balance sheet also shows in what the business earns on the capital it uses. Return on equity was about 28 percent in fiscal 2025, and return on invested capital was roughly 19 percent, per Tenet data. Those are high figures for any company and unusual for a grocer. High returns on capital, sustained over years, are the fingerprint of a business with a real advantage rather than a lucky season. If you want the mechanics of that gauge, see return on equity (ROE).

There is a subtlety worth naming. Costco funds a large part of its operations with money that is not its own. It collects membership fees up front and pays suppliers on a delay, so cash from members and inventory financing sits on the balance sheet before the bills come due. The result is a business that generates cash before it consumes it, which is the opposite of most capital-hungry retailers and a quiet part of why the returns stay high.

Valuation discipline: a wonderful business at a demanding price

Business quality is only half of an investment decision. The other half is price, and this is where Costco asks the most of a buyer. In July 2026 the shares traded around $950, giving a market value near $421 billion and a trailing price-to-earnings multiple of about 52 based on fiscal 2025 diluted earnings of $18.21 a share.

To see how demanding that is, look at Costco's own history rather than at other companies. For much of the last decade the stock carried a multiple in the high 30s. It sat near 38 times earnings in fiscal 2020 and again in fiscal 2023, then re-rated sharply higher. A move from the high 30s to the low 50s is not a small shift. It means buyers today are paying meaningfully more for each dollar of Costco's earnings than buyers did a few years ago, for a business growing at a broadly similar pace.

A 52 multiple carries an earnings yield near 1.9 percent, which is the flip side of the same coin: at today's price, one year of Costco's current earnings equals under two cents on the dollar invested. That can still work out well if earnings keep compounding for a long time, but the price already assumes they will. There is little margin for disappointment built in. The distinction between a great company and a great investment, and when the two part ways, is exactly the question taken up in is Costco worth the premium?.

Our discipline here is simple to state and hard to follow. We separate the judgment "this is a wonderful business" from the judgment "this is a sensible price," and we never let the first quietly answer the second. Costco clears the quality bar with room to spare. Whether it clears the price bar depends on assumptions about the next ten years that each investor has to make and own.

The long-term record: steady compounding

Costco's track record is the reason the market pays up, and it is worth looking at directly. Over the five fiscal years from 2020 through 2025, revenue grew from about $166.8 billion to roughly $275.2 billion, a compound annual growth rate near 10 percent. Net income roughly doubled over the same span, from about $4.0 billion to $8.1 billion, a compound rate near 15 percent. Diluted earnings per share climbed from $9.02 to $18.21.

The pattern in the table below is the one value investors look for: growth that is unspectacular in any single year and powerful when stacked across many.

Figures are from Costco's fiscal 2025 10-K and Tenet data as of July 2026. Past results do not predict future returns; a decade of steady growth tells you what a business has done, not what it will do. What the record does show is consistency. Costco grew through a pandemic, an inflation spike, and a normalization afterward without a down year in revenue or earnings, which is rare and speaks to the durability of the model. The longer arc of that compounding is the subject of Costco as a long-term compounder.

It also helps to see Costco next to a peer to keep the numbers honest. The same lens applied to a very different high-quality business appears in how we analyze Apple, and to a fellow specialty retailer with its own moat in how we analyze AutoZone.

Where to go from here

Costco is a clear example of the Tenet lens in action: a business whose thin margins are its strength, backed by a fortress balance sheet and a decade of steady compounding, offered at a price that leaves little room for error. If you want to pressure-test the valuation question, read is Costco worth the premium?, then open the live Costco report on Tenet and check the current multiple against the history above for yourself.