Nvidia Ends Q3 on the Right Side of the AI Split

Artificial-intelligence stocks diverged sharply in the third quarter of 2026, with software names and Nvidia rebounding while Ciena, CoreWeave, Broadcom and Alphabet's Google lagged, according to Investor's Business Daily; Nvidia closed the Sept. 28 session up 1.68% at 228.86 while the Nasdaq 100 fell 1.07%.

The artificial-intelligence trade stopped moving as one block in the third quarter. What had been a single directional bet for most of the past two years split into winners and laggards, and the dividing line was not "AI" versus "not AI" — it ran straight through the middle of the AI complex itself.

Software names and Nvidia (NVDA) rebounded over the quarter, while Ciena (CIEN), CoreWeave (CRWV), Broadcom (AVGO) and Alphabet's Google (GOOGL) lagged, according to Investor's Business Daily. That is a meaningful reshuffle: three of the four laggards are infrastructure plays — optical networking, rented GPU capacity, custom accelerator silicon — the exact layer that led the market in earlier phases of the buildout.

The final session of the quarter kept the pattern intact

Monday, Sept. 28 was a red day for the broad market, and the split held anyway. The Nasdaq 100 tracker (QQQ) closed at 736.53, down 1.07% from its prior close of 744.50, with a day range of 731.63 to 741.42. The S&P 500 proxy (SPY) finished at 765.61, off 0.74%, and the Dow tracker (DIA) at 514.02, down 0.67%.

Against that, Nvidia closed at 228.86, up 1.68% from 225.07 — a swing of roughly 2.75 percentage points better than the Nasdaq 100 on the day, an illustrative gap calculated from the two quoted moves. Nvidia's intraday band ran 228.04 to 233.21, meaning the stock spent the session above its previous close even as the index sank.

The four laggards all closed lower:

• Ciena: 344.19, down 3.56% from 356.91, with a day range of 339.33 to 356.99 — the widest swing of the group.
• CoreWeave: 85.07, down 2.88% from 87.59, range 83.53 to 88.22.
• Broadcom: 349.57, down 0.92% from 352.81, range 347.32 to 355.86.
• Google parent Alphabet: 342.75, down 0.34% from 343.92, range 339.56 to 343.59 — the mildest decline, and a stock that closed below the low end of where it opened the prior session's range.

None of that is a quarter's worth of evidence on its own. But a single session in which the quarter's leader gains and all four of the quarter's laggards fall is a reasonable snapshot of a trade that has not yet reversed itself.

Why the infrastructure layer stopped leading

The common thread among the four names that lagged is that each sells into the physical buildout rather than the application layer sitting on top of it. Ciena supplies the optical transport gear that links data centers to each other and to the wider network. CoreWeave rents out GPU compute by the hour. Broadcom designs custom AI accelerators and the switching silicon that moves data inside a cluster. Google both buys and builds — it is a hyperscaler spending heavily on its own capacity while also selling cloud services against Amazon and Microsoft.

Infrastructure businesses share a structural problem once a buildout matures: their revenue is lumpy, tied to order cycles and to a small number of very large customers, and their margins get scrutinised the moment investors start asking when the capital spending stops. Equity markets tend to pay a premium for that exposure early in a cycle and demand a discount later, when the question shifts from "how fast can they ship" to "what happens when the orders pause."

CoreWeave is the purest version of that risk. A company whose entire model is owning depreciating hardware and leasing it out is exposed on both sides — to the price of GPUs it buys and to the rental rate it can charge. When capacity is scarce, that is a very good business. When capacity catches up with demand, it is a commodity one.

What a software rebound actually signals

The other half of the divergence — software plays recovering — is the more interesting half, because software was the part of the AI trade investors spent most of 2025 and early 2026 doubting. The bear case was straightforward: if large models get good enough, they eat the application layer rather than enrich it, and incumbent software vendors find their products commoditised by the same technology they are trying to sell.

A rebound in those names suggests the market has at least partially retired that argument, or decided it was priced in. Software firms carry a different financial profile from the infrastructure suppliers: recurring revenue, lower capital intensity, and the ability to monetise AI by raising prices on an existing base rather than by winning new hardware orders. In a quarter when investors were plainly reassessing how long the capex wave runs, capital rotating from the picks-and-shovels layer toward the recurring-revenue layer is a coherent move rather than a random one.

Nvidia's presence on the winning side complicates the neat version of that story. It is the most infrastructure-exposed company in the entire complex. Its rebound alongside software, while Broadcom and CoreWeave lagged, points to something narrower than a sector rotation — a market willing to pay for the dominant merchant supplier while marking down everyone positioned one step away from it.

What to watch into the fourth quarter

Three things will settle whether this divergence is a rotation or a head-fake. First, hyperscaler capital-expenditure guidance: the infrastructure names live or die on those budgets, and any signal that spending growth is flattening hits Ciena, CoreWeave and Broadcom before it hits anyone else. Second, whether software vendors can show AI features converting into realised pricing rather than pilot programs. Third, Nvidia's ability to keep separating itself from the custom-silicon challenge that Broadcom represents.

For investors, the practical lesson from the quarter is that "AI exposure" is no longer a single risk factor. Owning Ciena and owning a software vendor with AI-priced upsells are now bets on different things, and the third quarter of 2026 was the period in which the market started charging different prices for them.

Key facts

• NVDA close, Sept. 28, 2026 (4:00 p.m. ET): 228.86, +1.68% (prev close 225.07)
• Q3 laggards named: Ciena (CIEN), CoreWeave (CRWV), Broadcom (AVGO), Google (GOOGL)
• Biggest single-day drop among the four: Ciena, -3.56% to 344.19
• Nasdaq 100 (QQQ) close: 736.53, -1.07% on the day

Frequently asked questions

Which AI stocks rebounded in the third quarter of 2026?

Investor's Business Daily reported that software-focused AI plays and Nvidia rebounded during the third quarter of 2026, while the infrastructure side of the trade lagged. Nvidia also outperformed on the final session of the quarter, closing Sept. 28 at 228.86, up 1.68%, on a day when the Nasdaq 100 tracker fell 1.07%.

Which AI names lagged in Q3 2026?

Ciena, CoreWeave, Broadcom and Alphabet's Google were identified as the laggards. All four closed lower on Sept. 28: Ciena at 344.19 (-3.56%), CoreWeave at 85.07 (-2.88%), Broadcom at 349.57 (-0.92%) and Google at 342.75 (-0.34%). Three of the four are infrastructure suppliers rather than application-layer businesses.

Why would AI infrastructure stocks underperform while software rebounds?

Infrastructure suppliers depend on lumpy, order-driven revenue from a small set of very large customers, and they are capital-intensive. Software vendors carry recurring revenue, lower capital needs, and can monetise AI by repricing an existing customer base. As investors question how long the capital-spending wave runs, that profile difference gets repriced.

What is CoreWeave's business model?

CoreWeave rents out GPU compute capacity by the hour to customers training and running AI models. That makes it exposed on both sides of the trade: to the cost of the hardware it buys and depreciates, and to the rental rate it can charge. It is a strong business when capacity is scarce and a commodity one when supply catches up.

How did the broad market close on Sept. 28, 2026?

It was a red session. The S&P 500 tracker closed at 765.61, down 0.74% from 771.35. The Nasdaq 100 tracker finished at 736.53, down 1.07% from 744.50. The Dow tracker ended at 514.02, down 0.67% from 517.49. All three closed near the lower end of their intraday ranges.

What should investors watch in the fourth quarter?

Three signals matter most: hyperscaler capital-expenditure guidance, which drives revenue for Ciena, CoreWeave and Broadcom; evidence that software vendors are converting AI features into realised pricing rather than unpaid pilots; and whether Nvidia can keep distancing itself from the custom-accelerator competition Broadcom represents.

Sources

• These AI Stocks Took Off Or Tumbled In Q3. Here's Why. — Investors Business Daily

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