Walmart's Profit Engine Isn't the Aisle Anymore. It's the Ad Behind the Aisle.

Walmart moved roughly $674 billion of merchandise in the fiscal year that ended in January 2025 - groceries, televisions, tires, a billion gallons of milk.¹ It is the largest pile of physical commerce in the world, and it is also one of the least profitable per dollar. Margins on a head of lettuce are punishing by design. So here is the question worth sitting with: if the merchandise barely makes money, where is the profit growth coming from? Not the aisle. It's coming from the ad behind the aisle, and the membership behind the cart.

The official story is that Walmart is a retailer - the everyday-low-price champion, winning on tonnage and operational grind. That story is no longer where the money is bending. The thing reshaping Walmart's economics is not how much it sells. It's a far smaller, far richer business sitting on top of the selling.

State it plainly: Walmart's advertising and membership businesses, not its retail tonnage, are now the primary engine of operating-income expansion. In the second quarter of fiscal 2025, the company's CFO told investors those two lines together drove more than half of operating-income growth for the quarter.⁷ More than half. From businesses you'd never find on a shelf.

A rounding error that does the heavy lifting

Walmart's global advertising generated about $4.4 billion in fiscal 2025.¹ Against $681 billion in total revenue, that's 0.65% - a rounding error.⁶ But look at how it moves. Walmart Connect, the U.S. retail-media arm, has grown between 22% and 33% in every quarter it's disclosed, outpacing both retail sales and e-commerce by a wide margin - advertising compounding roughly six times faster than the merchandise underneath it.⁶ Then the whole global ad business jumped again, to $6.4 billion in fiscal 2026, up 37% globally and 41% for Walmart Connect in the U.S.⁸

The reason a tiny line item can swing the profit picture is margin. A dollar of advertising and a dollar of milk are not the same dollar. The milk dollar carries the cost of the cow, the truck, the cold case, the cashier. The ad dollar is a fee charged for showing a brand to shoppers who were already coming - traffic Walmart had already paid for, sold a second time. The marginal cost of one more sponsored listing is close to nothing. So a small ad business, growing fast, can contribute outsized profit growth while staying a rounding error on revenue. That is the entire mechanism, and it's the same one that quietly made Amazon a software company wearing a warehouse.

Why Walmart paid $2.3 billion for a TV brand

On December 3, 2024, Walmart closed a $2.3 billion acquisition of Vizio.⁴ On its face, this is strange. Walmart already sells more televisions than almost anyone; why buy a struggling TV maker? Because Walmart wasn't buying televisions. It was buying the operating system inside them - the screen that decides which app glows when you turn the set on, and which ad runs while you decide what to watch. Vizio is, beneath the hardware, an advertising surface that sits in living rooms. It folded into the Walmart U.S. segment as a wholly owned subsidiary.⁴

The logic is the logic of the whole shift. Walmart's retail-media business has been confined to where people shop - the app, the site, the screen above the deli counter. Vizio extends it to where people sit afterward. Sell a brand a sponsored search result and the TV ad that follows the shopper home, and you start to look less like a retailer with a side hustle and more like a media platform with a warehouse attached. That is the destination. Whether Walmart reaches it is a separate question.

Isn't this just the Amazon story with a worse hand?

The fair objection is that the whole 'Walmart is becoming a platform' thesis rests on numbers Walmart won't show you. And it largely does. Walmart does not disclose how many people pay for Walmart+ - the figures you read, 25 million here, 30 million there, all come from outside survey firms estimating membership users, and those firms openly flag that confirmed paid subscribers are presumably lower.⁵ There is no Walmart-reported subscriber count at all. The 'membership and other income' line on the income statement - $6.447 billion in fiscal 2025¹ - isn't even pure membership; it bundles in unrelated corporate income. And Walmart files no standalone P&L for advertising, so the margin claims rest on what the CFO chooses to say on a call, not on anything you can recompute from the filing.⁸ The Amazon comparison flatters: advertising is roughly 10% of Amazon's revenue and 0.65% of Walmart's.⁶

All true - and none of it kills the thesis; it just constrains how loudly you can state it. The direction is not in dispute. The growth rates are real, disclosed, and consistent for nine straight quarters.⁶ By fiscal 2026 the CFO was saying advertising and membership together made up fully a third of profit in the most recent quarter.⁸ The honest position is this: the margin mix is genuinely shifting toward high-margin platform income, and the disclosure is thin enough that you should trust the trend and distrust any precise number anyone hangs on it. The story is true and unverifiable at the same time - which is exactly the kind of story a careful reader should hold loosely and watch closely.

Walmart spent fifty years winning the one game everyone could see: move more stuff, cheaper, than anyone alive. It is still winning that game, and that game still barely makes money. The quieter move is the one reshaping the company - selling the shopper's attention back to the brands competing for it, at margins the lettuce could never dream of. The merchandise was never the point of the merchandise. It was always the bait. The profit is in the ad, not the aisle - and Walmart just bought a few million living-room screens to prove it can keep collecting once the cart is empty.