Broadcom's AI Revenue Tripled, but Its Margins Slipped

Broadcom reported its fiscal third quarter after the US close on September 2. One figure captures what the company has become over twelve months: the $16.7B it earned from AI chips alone in the quarter exceeds the $15.9B the entire company earned a year earlier.

In other words, one product line now brings in more in three months than every Broadcom business combined did in the same quarter last year.

The numbers cleared expectations. LSEG consensus called for $29.52B in revenue and $3.25 in adjusted earnings per share; Broadcom delivered $29.59B and $3.32. Operating profit rose 92% year over year and free cash flow reached $13.7B, or 46% of revenue.

CEO Hock Tan's line in the release was short:

"Demand for our custom AI accelerators and networking continues to be very strong."

But the more useful information sits in the margin, and there the number is moving down, not up.

What Broadcom Sells: Not a Shelf Product, a Commissioned One

You cannot read the margin without understanding the difference.

Broadcom's weight is shifting toward the second model. Semiconductor revenue reached $20.8B in the third quarter, up 127% year over year, and $16.7B of that was AI. The software business came in at $8.8B, up 29%.

The Only Business Growing Is the Thinnest One

Here is the second number. AI's share of total revenue has moved this way across three quarters:

Over the same stretch, gross margin — what is left of each sales dollar after the direct cost of making the product — moved the other way:

The two moves are not independent. Broadcom runs four businesses, each of which leaves a different amount of profit per dollar sold: infrastructure software the most, networking in the middle, custom accelerators the least. The reported margin is a weighted average of those four. When the lowest-margin line grows fastest, the average falls — even if no individual business gets worse.

This is one of the most frequently missed points in reading a set of accounts: a falling ratio does not necessarily mean the business is deteriorating; it can simply tell you which part is growing. More: How to Read an Earnings Report

What the Incremental Dollar Brings

Here is the arithmetic. For three quarters Broadcom held a curious balance: gross margin fell while operating margin did not. Operating expense was the reason.

What held the balance for three quarters was an expense line that did not grow. Broadcom's non-GAAP R&D expense in the third quarter was $1.55B, and total operating expense roughly $2.09B — 7% of $29.6B in revenue. Capital expenditure was just $0.5B for the quarter. The company sells to the people building data centers without building any itself; the capital burden sits with the customer.

As long as expenses stay flat, a thinning gross margin never surfaces in operating profit. The fourth-quarter guide is the first quarter in which that cushion runs out.

The chart above is live; it shows where the stock trades today, not the event itself. Results came after the US close on September 2, and post-market trading was still under way as this was written. The previous quarter also beat expectations and the stock still fell hard, so reading the first hours of trading as a verdict would be premature.

Markets were recovering from two straight losing days when the report landed. August private payrolls added 38,000 jobs — the slowest month since January — and the 10-year Treasury yield hit 4.81%, its highest since late 2023. For the broader AI trade, the index is the better gauge than any single name:

Timeline

That June bookings figure explains why today's picture surprised nobody. Tan said then:

"We reiterate our AI semiconductor revenue guidance to be in excess of $100 billion."

In the same quarter, more than $30B of orders came in against $10.8B shipped — a book-to-bill of roughly 2.8. The order book is filling far faster than product is going out the door.

The Other Side: The Ratio Falls, the Money Rises

A falling margin ratio is not a falling profit. Three quarters side by side make that plain.

Broadcom gave no gross-margin guidance for the fourth quarter. If operating expense stays near current levels, the revenue and operating-profit guidance imply a gross margin around 72% — that is a calculation, not a company statement.

Meanwhile operating profit climbs from $14.93B to $22.97B in two quarters. An investor watching the ratio and an investor watching the dollars will draw different conclusions from the same report. Neither is wrong; they answer different questions. More: What Is Valuation?

What Is Left Open

Two questions the report does not answer.

The first is concentration. AI is now 56% of revenue, and behind that revenue sits a small number of customers — Google, Meta, OpenAI and others who commission their own silicon. Each of them is also building out its own design teams and is large enough to move work to a rival such as Marvell. Broadcom's bargaining power runs inversely to how few those customers are.

The second is how far the margin goes. If AI's share keeps climbing past 62%, nothing in the arithmetic stops it: an average moves toward its lowest component as that component's weight rises. The cushion Broadcom has been using — an operating expense line that does not grow — is not infinite.

The stock's 25% retreat from $495 to around $370 can be read as those two questions being priced. On expected fiscal 2027 earnings the multiple has come down from 25 to 19.

This piece is based on Broadcom's third-quarter press release of September 2, 2026 and the financial statements published on the company's investor relations site; second-quarter comparisons come from the June 3, 2026 release. Analyst expectations are from the LSEG consensus, the bookings figure and the fiscal 2027 outlook from accounts of the June earnings call, and the share price and drawdown from the high from market summaries dated August 30, 2026. The fourth-quarter gross-margin figure is not a company statement but a calculation derived from the revenue and operating-profit guidance. Post-market price action had not settled at the hour of writing and is therefore not interpreted here.