Why Is Marvell Stock Rising? S&P 500 Entry, Nvidia Deal and AI Growth Explained

Marvell Technology shares jumped 10.4% at the opening bell on June 8, 2026, pushing its year-to-date gain past 210%. That looks like the story. But the number is almost a distraction from what was really happening. Marvell had been the largest company eligible for S&P 500 inclusion for over a year, sitting outside the world's most tracked index while its stock nearly tripled. 

Most people never asked why. The answer sits in a technical accounting rule, and understanding it explains a lot about what happened this past week and what comes next.

Let's break down every trigger behind the sharp rally in MRVL stock, the structural reason Marvell was kept out of the S&P 500 for so long, why the index entry is a bigger deal than it sounds, and what investors should do now.

Why is Market Stock Rising?

To understand Monday's move in Marvell, you need the full week.

On Tuesday, June 3, Nvidia CEO Jensen Huang took the stage at Computex 2026 in Taipei alongside Marvell CEO Matt Murphy. Huang looked at the crowd and said: "Ladies and gentlemen, the next trillion-dollar company." He was pointing at Marvell. The stock surged 32.52% that session alone, its biggest single-day gain in its trading history. Marvell's market cap was roughly $254 billion at the time, so Huang's forecast implied a roughly fourfold rise from where the company stood.

By Thursday, the mood shifted. Rival chipmaker Broadcom reported earnings that beat estimates but declined to raise its AI revenue outlook. Investors, who had been sitting on enormous gains across the semiconductor sector, took that as a signal to book profits. Marvell fell 16.7% on Friday. The broader semiconductor index dropped 10%, and the Nasdaq Composite fell 4.18%, its steepest single-day drop since April 2025. The sector shed roughly $1.4 trillion in market value in that one session, per Bloomberg.

Then, after Friday's close, S&P Dow Jones Indices announced that Marvell would join the S&P 500 effective June 22. Shares jumped 6% in after-hours trading. Monday morning brought another 10.4% gain at the open.

Sources: CNBC, Yahoo Finance, Bloomberg

That Friday dip is worth flagging. The stock had gained over 50% in a week on Jensen Huang's comments. When Broadcom's guidance came in flat, investors who had ridden the wave decided Monday's session after Computex was a good time to ring the cash register. Monday's bounce was partly fundamental news, and partly a recovery from that technical selloff.

Why Marvell Was Kept Out of the S&P 500 Until Now

Here is what almost nobody is covering properly. Marvell was the largest eligible company not in the S&P 500 for most of 2025. At certain points, its market cap was more than three times that of the next eligible candidate. So why wasn't it added during earlier rebalancing cycles? To enter the S&P 500, a company must be profitable under GAAP accounting. It needs to report positive GAAP earnings in its latest quarter and also across the last four quarters combined. Marvell struggled with this requirement because of its acquisition-heavy strategy. 

Between 2021 and early 2026, it bought Inphi, Cavium, Celestial AI for $3.25 billion, and XConn Technologies. These deals helped Marvell grow in data infrastructure and AI chips. But they also came with large accounting charges. In simple terms, Marvell had to record extra costs from these acquisitions on its books. That pulled down its reported profit, even though the main business was still bringing in strong cash.

It is like a person applying for a home loan in India with strong income and good cash flow, but a tax return that shows a loss because of large business expenses. The money may be coming in, but the bank follows the paperwork. Marvell’s case was similar. The business was doing well, but its reported profits were hit by acquisition costs. That paper loss kept it from meeting the S&P 500 rule. 

In Q1 FY2027, ended May 2, 2026, the company finally posted GAAP net income of $34.5 million, clearing the index's test. The S&P 500 committee apparently waited for exactly this. Within weeks of that earnings report, the inclusion announcement came.

What Marvell’s S&P 500 Entry Means for Investors

The S&P 500 is the benchmark for roughly $8 trillion in passive investment. When a company joins the index, every fund and ETF tracking the S&P 500 must buy that stock in proportion to its weight.

Indian investors know this concept well. When a stock gets added to the Nifty 50 or the Sensex, every index mutual fund tracking that benchmark automatically buys shares. The same mechanism applies here, just at a far larger scale.

Marvell is expected to have a 0.3% to 0.4% weight in the S&P 500. That looks small, but in an index as large as the S&P 500, it can still mean billions of dollars of demand. The main buying is likely to happen around the June 22 inclusion date, though some funds may buy earlier to position ahead of the change.

Here’s how some other recent AI-infrastructure-adjacent additions fared after joining the index.

Source: Benzinga, S&P Global data

The pattern is clear: inclusion forces buying, not returns. Companies tied to physical AI infrastructure, power, and cooling, like EMCOR and Vertiv, have done well after joining. The Trade Desk, an ad-tech platform, ran into business headwinds that no amount of index buying could offset. Marvell's business case is closer to Vertiv and EMCOR than The Trade Desk. It supplies the plumbing of AI data centers.

How Nvidia Partnership Strengthens Marvell’s AI Chip Story

On March 31, 2026, Nvidia and Marvell announced a $2 billion equity investment and a strategic partnership through NVLink Fusion. For Marvell, this is a major validation. It places Marvell’s custom XPUs and networking chips inside Nvidia’s AI data center ecosystem, making them more relevant to hyperscalers building large AI clusters.

The biggest benefit is access. If a cloud company builds on NVLink Fusion, Marvell can supply the custom silicon, while Nvidia provides key parts of the stack such as Vera CPUs, ConnectX NICs, BlueField DPUs and Spectrum-X switches. That gives Marvell a stronger route into AI data center deals where Nvidia already has deep customer relationships.

The partnership also strengthens Marvell’s silicon photonics push. Marvell bought Celestial AI for $3.25 billion in February 2026 to build light-based data center connectivity. Working with Nvidia gives that technology a much larger platform and improves Marvell’s position in next-generation AI infrastructure.

Why Marvell Is Becoming the "Switzerland of AI Chips"

Most chip companies are in competition with each other. Marvell is doing something unusual: it is the primary chip designer for companies that are in direct competition with each other.

Marvell designs Amazon Web Services' Trainium chips, the custom AI accelerators that AWS is positioning as an alternative to Nvidia GPUs for training large models. Amazon has over $225 billion in Trainium revenue commitments. Amazon CEO Andy Jassy said on Amazon's Q1 earnings call that AWS's chip business annual run rate would be $50 billion if sold externally.

Marvell also designs Microsoft's Maia custom chips. And now, Marvell is formally embedded inside Nvidia's supply chain through NVLink Fusion. It is designing chips for the companies trying to reduce dependence on Nvidia, while simultaneously being paid and backed by Nvidia itself. That is an unusual position, and it is what Oppenheimer analysts meant when they called Marvell "the Switzerland of interconnect" in recent research.

What Marvell Earnings Numbers Show:

Sources: Marvell Technology Q1 FY2027 Earnings Release, SEC 8-K filing, Marvell Investor Relations

CEO Matt Murphy said on the earnings call: "We are seeing exceptional AI-related bookings." That phrase, combined with a Q2 guide that came in above consensus expectations, was what started the momentum that Jensen Huang then amplified.

What Should Investors Watch For With MRVL Stock?

For people interested in investing US Stocks like Marvell from India, the bull case is strong, but so is the valuation risk. Marvell now sits inside Nvidia’s ecosystem, Amazon’s chip supply chain and the S&P 500 inclusion trade. The question is whether future growth can justify how much optimism is already priced in.

Bull Case for Marvell Stock

• AI revenue momentum is improving: Revenue is accelerating, and management has raised guidance for two straight quarters.
• Nvidia partnership adds credibility: Marvell is now part of Nvidia’s NVLink Fusion ecosystem, giving it stronger relevance in custom AI chips and data center networking.
• Amazon exposure adds another demand driver: Marvell is also linked to Amazon’s chip supply chain, which strengthens its position in hyperscale AI infrastructure.
• S&P 500 inclusion can support near-term demand: Marvell’s expected 0.3% to 0.4% index weight could lead to billions of dollars of buying around June 22.
• Growth partly supports valuation: A PEG ratio of around 1.33 suggests the market is paying up, but not without a growth argument.

The S&P 500 inclusion adds a near-term technical tailwind. With Marvell expected to join the index on June 22, passive funds tracking the S&P 500 may need to buy billions of dollars worth of shares.

Bear Case for Marvell Stock

• Valuation is expensive: Marvell trades at around 99x trailing P/E and 58x forward P/E, far above its five-year median P/E of around 30x.
• Expectations are high: At these multiples, even one weak quarter or softer guidance could trigger a sharp pullback.
• Insider activity is not very encouraging: There have been around $32 million of insider sales in recent months, with no insider purchases. This is not conclusive, but worth noting.
• Index buying is a short-term support, not a business driver: S&P 500 inclusion may help near-term demand, but after June 22, the focus shifts back to earnings growth.

Marvell Stock Outlook: Key Takeaway for Investors

Near term, S&P 500 inclusion could support Marvell around the June 22 effective date. After that, the focus shifts back to fundamentals, especially Q2 results expected around late August or September.

There is no easy answer here. If Marvell keeps executing on AI infrastructure, today’s valuation may look more reasonable over the next two years. But if growth disappoints, a 40–50% pullback cannot be ruled out given how expensive the stock already is.