Nvidia And The AI Infrastructure Boom Just Hit A New Gear

Nvidia crossed into record territory Tuesday, and it didn't do it alone — the entire AI infrastructure trade moved with it. The chipmaker's stock closed at an all-time high, pushing its market cap toward the $6 trillion mark, while a broader rally lifted Ciena nearly 14% and Nebius more than 7% on the same session.

The real catalyst wasn't Nvidia's own news — it was Marvell. At its Investor Day, the chipmaker delivered guidance aggressive enough to pull the whole sector higher with it. A few figures from that announcement set the tone for Tuesday's rally:

• Marvell raised its fiscal 2028 revenue forecast to roughly $20 billion, up from $18 billion previously
• The company set a longer-term target of $70 billion to $90 billion in annual revenue by fiscal 2031, a figure framed around a roughly $400 billion total addressable market it now sees forming around AI infrastructure
• Marvell also raised its operating margin guidance to 44-46%, up from a prior 38-40% range

Worth flagging directly: that $70-90 billion figure is Marvell's own internal guidance to investors, not an independent market forecast — it reflects what the company's management believes it can capture, and ambitious long-range targets like these don't always play out as projected.

Notably, Marvell's own shares actually fell after the announcement even as it lifted peers like Nebius, a reminder that "raised guidance" and "beat expectations" aren't the same thing.

Some AI names were already giving back gains in Wednesday's pre-market trading, a pattern that's become familiar this year: infrastructure spending announcements keep arriving bigger than the last, but the stocks reacting to them have shown they can reverse just as quickly once investors start questioning whether the capital expenditure curve can actually keep climbing at this pace.