The question this number answers
A company can announce record sales and still leave its owners no better off. Revenue per share exists to catch that. It takes everything the business sold in a year and divides it by the number of shares that exist, so you see how much of that selling sits behind the single share in your account.
Think of a pizza. Total revenue is the size of the pizza. Share count is how many slices it has been cut into. A bigger pizza cut into far more slices can leave you holding less pizza than before, and revenue per share is the number that tells you which happened.
Working it out with Costco
Costco recently reported around $254 billion of annual revenue with roughly 444 million shares in existence. Divide one by the other: 254,000,000,000 divided by 444,000,000 gives about $572 of sales per share.
On its own that figure means very little. It becomes useful the moment you line it up against previous years. If revenue per share climbed from roughly $520 to $572, sales grew and the growth reached shareholders. If revenue had grown while revenue per share stood still, you would know the company had quietly issued more shares to fund that growth.
These are rounded recent figures used to show the arithmetic, not live data. The method is what matters, and Stax runs it on current filings for you.
How the figure gets flattered
Share count is the moving part most beginners miss. When a company buys back its own shares, the slice count falls, and revenue per share rises even though the business sold not one extra item. That is not automatically bad, but it is not sales growth either, and reading it as sales growth is a mistake.
The reverse also happens. Companies that pay staff heavily in shares, or that issue shares to fund an acquisition, quietly increase the slice count every year. Sales can grow a respectable 8% while revenue per share barely moves, because the extra sales were bought by handing out more ownership.
What it stays silent about
Revenue per share says nothing at all about profit. A company can sell more every year, growing this number handsomely, while losing cash on every sale. Plenty of businesses have gone bankrupt with a beautiful revenue chart.
It also flatters nothing about quality. Selling $572 of low-margin goods per share is a different business from selling $572 of software subscriptions per share, and this number cannot tell them apart. Pair it with a profitability measure before you draw any conclusion.
Putting it to work in Stax
Used alone it is weak. Used as a growth filter next to a profitability filter it earns its place: ask for companies whose revenue per share has grown steadily and whose operating margin is healthy, and you have described a business that is selling more and keeping some of it.
Once your filter produces a list, the useful step is not to admire it. Build a plan around those companies and test it against five or more years of real market prices. Stax fills every simulated trade at the next trading day’s open and charges fees, so the result reflects what the rule would have cost you, not a flattering sketch of it.