Broadcom Falls 6% as Soft Guidance Overshadows 221% AI Revenue Surge; NVIDIA Inches Higher, AMD Slips

Semiconductor investors got a split verdict this morning as Broadcom's fiscal third-quarter report landed as a guidance and margin story rather than an AI demand story. The sector fund is easing modestly while one large AI peer is pushing higher, which frames the reaction as company-specific rather than a broad rerating of AI infrastructure names.

Broadcom (NASDAQ:AVGO) stock is down 6% to $346.49 after a soft current-quarter revenue guide overshadowed triple-digit AI growth. Meanwhile, NVIDIA (NASDAQ:NVDA) stock is up 1% to $227.69 as the custom-silicon commentary from Broadcom reads as confirmation of the AI compute cycle rather than a warning on it. Advanced Micro Devices (NASDAQ:AMD) stock is down 2% to $448.68, and Marvell Technology (NASDAQ:MRVL) stock is down 0.6% to $205.20, both slipping on read-across concerns about custom-accelerator margins.

The iShares Semiconductor ETF (NASDAQ:SOXX) is down 1% to $494.04. That contained sector move reinforces the Broadcom-specific read on this session's action.

Guidance Miss and Margin Compression Overshadow AI Beat

Broadcom reported fiscal third-quarter revenue of $29.6 billion, up 86% year over year, with adjusted earnings of $3.32 per share. The AI semiconductor line at Broadcom reached $16.7 billion, up 221% year over year and up 54% from the prior quarter, and AI now represents 56% of Broadcom revenue, according to Broadcom Inc..

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The catch sits in the outlook. Broadcom guided current-quarter revenue to $34.8 billion versus consensus of $35.05 billion, and its Q4 2026 AI semiconductor guide of $21.7 billion, up 236% year over year, wasn't enough to offset margin worries, according to Broadcom Inc.. Broadcom's gross margin fell 210 basis points sequentially, and Q4 consolidated gross margin is guided to 73%, down from 78% a year earlier. That step-down is a mechanical result of custom accelerator and high-bandwidth memory content growing as a share of revenue, so Broadcom is converting spectacular top-line growth into thinner incremental profit.

Custom-Silicon Story Splits AI Chip Peers

Broadcom CEO Hock Tan stated, "Demand for our custom AI accelerators and networking continues to be very strong." Tan also told analysts Broadcom expects to ship $350 billion of AI semiconductors to six hyperscaler customers over two years, comprising $115 billion in fiscal 2027 and $230 billion in fiscal 2028. That two-year book is the bull case, and it's a big part of why NVIDIA shares are green in the same session that Broadcom shares are being sold.

Wall Street's read on Broadcom was split. StoneX analyst Cody Acree, who holds a Buy rating, stated, "The magnitude is not quite enough from a top and bottom line standpoint on the beat and raise when you have a company that is this levered to AI." JPMorgan analyst Harlan Sur called Broadcom's AI revenue outlook "strong and conservative," raised his estimates, and maintained an Overweight rating.

Sector Scorecard Frames the Reaction

The year-to-date picture explains a lot of Broadcom's tone. Broadcom was up 7% year to date through the prior close, well behind AMD, which was up 113%, and Marvell, which was up 143%. NVIDIA was up 20% over the same stretch, so Broadcom has been a laggard among the large AI chip names all year despite owning the custom-accelerator franchise.

Broadcom also sits well below its June peak of $495, as tracked by 24/7 Wall St. Marvell's own custom-silicon franchise, expanded through its multi-product agreement with Alphabet's (NASDAQ:GOOGL) Google, maps closer to Broadcom's business than to NVIDIA's GPU model, which is why Marvell shares are drifting alongside Broadcom rather than rallying alongside NVIDIA.

What to Watch

Broadcom is scheduled to present at the Goldman Sachs Communicopia and Technology Conference on September 8, which could give Hock Tan a stage to clarify the margin trajectory and the shape of the two-year hyperscaler book. The next hard data point is Broadcom's Q4 report, set for December 9, with the earnings call to follow.

Investors sizing their exposure to the AI chip complex could keep their positions moderate here, given how differently the same custom-silicon story is being priced across NVIDIA, AMD, Marvell, and Broadcom in this session. The unresolved question is whether Broadcom's margin normalization is the temporary cost of winning custom silicon share or the beginning of a structurally lower-margin business. For more on the valuation debate, see our earlier coverage: Broadcom is sitting at $370 and Wall Street suddenly has doubts about its AI business.

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