Broadcom's AI Revenue Tripled, but Its Margins Slipped

Broadcom reported its fiscal third quarter after the US close on September 2.

What it earned from AI chips alone exceeds the $15.9B the entire company earned a year earlier.

One product line, bigger than all of last year's company.

LSEG consensus called for $29.52B in revenue and $3.25 per share; Broadcom delivered $3.32.

Operating profit rose 92% year over year. 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 useful information sits in the margin. And there the number is moving down.

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

Semiconductor revenue reached $20.8B in the quarter, up 127% year over year. The software business came in at $8.8B, up 29%.

The Only Business Growing Is the Thinnest One

Gross margin moved the other way:

Broadcom runs four businesses; each leaves a different profit per dollar sold. Infrastructure software the most, custom accelerators the least.

When the thinnest line grows fastest, the average falls — even if no business gets worse.

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

For three quarters gross margin fell while operating margin did not. Operating expense was the reason.

Non-GAAP R&D expense was $1.55B, total operating expense roughly $2.09B, capital expenditure just $0.5B.

While expenses stay flat, a thinning gross margin never surfaces in operating profit.

The fourth-quarter guide is where that cushion runs out.

August private payrolls added 38,000 jobs — the slowest month since January.

The 10-year Treasury yield hit 4.81%, its highest since late 2023.

Tan said on the June call:

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

In that quarter, more than $30B of orders came in against $10.8B shipped — a book-to-bill of roughly 2.8. The order book fills faster than product goes out.

The Other Side: The Ratio Falls, the Money Rises

Broadcom gave no gross-margin guidance for the fourth quarter. The revenue and profit guidance imply around 72% — a calculation, not a company statement.

Meanwhile operating profit climbs from $14.93B to $22.97B in two quarters.

Ratio-watchers and dollar-watchers draw different conclusions from the same report. More: What Is Valuation?

What Is Left Open

First, concentration. AI is now 56% of revenue, and behind it sits a handful of customers — Google, Meta, OpenAI.

Each is large enough to move work to a rival such as Marvell.

Second, how far the margin goes. If AI's share climbs past 62%, nothing in the arithmetic stops it.

The cushion is not infinite.

The stock's 25% retreat from $495 to around $370 reads 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.

Correction (September 13, 2026): prose tightened for rhythm; figures and sources unchanged.