As of the week ending June 6, 2026, the S&P 500 is up approximately 4% for the year. Remove five stocks and the gain disappears entirely. NVIDIA, Broadcom, Amazon, Alphabet, and Intel have generated every point of the index’s advance, according to contribution-to-return data from S&P Dow Jones Indices. Collectively, those five names account for roughly 27% of the index by weight. The other 495 constituents, taken together, have added nothing on a net basis.
That makes this week’s earnings calendar unusually consequential. Alphabet reports on Tuesday, June 10. Amazon follows on Thursday, June 12. Broadcom closes the trio on Friday, June 13. A single disappointing print from any of them could erase weeks of index-level progress in a single session.
Why these five stocks and why now
The common thread is artificial intelligence spending. NVIDIA sells the data-center GPUs that train and run large AI models and has contributed an estimated 1.3 index points to the S&P 500’s year-to-date gain. Broadcom supplies custom accelerators and networking silicon to hyperscale cloud operators, adding roughly 0.7 points. Amazon’s AWS division is racing to expand AI-optimized compute capacity, contributing approximately 0.8 points. Alphabet is embedding generative AI across Search, Cloud, and its advertising stack, responsible for about 0.6 points. Intel, the most unexpected name on the list, has rallied more than 40% year to date on renewed investor confidence in its foundry turnaround and its Gaudi accelerator lineup, contributing roughly 0.4 points to the index.
Investors have piled into the companies they believe will capture AI-driven revenue growth fastest, and that conviction has widened the gap between the market’s winners and everyone else. The dynamic is not new. During 2023 and 2024, the so-called Magnificent Seven accounted for the bulk of S&P 500 returns, at times representing more than 30% of the index’s total market capitalization. What has changed in 2026 is that the leadership group has narrowed further: five names now do the work that seven used to share.
“We have not seen this degree of index-level concentration since the late 1990s,” noted Howard Silverblatt, senior index analyst at S&P Dow Jones Indices, in a June 2026 commentary. “When five stocks account for all of the year-to-date return, any earnings miss becomes a market-wide event.”
What the filings show heading into earnings
Alphabet’s most recent 10-Q, covering the quarter ended March 31, 2026, breaks out revenue across Google Services, Google Cloud, and Other Bets. Cloud revenue growth and the margin trajectory of Alphabet’s AI investments are the benchmarks Wall Street will use to judge the new quarter. The core question: is the company’s aggressive infrastructure spending translating into top-line acceleration, or is it mainly inflating costs?
Amazon’s 10-Q for the same period details AWS cloud revenue alongside retail segment margins and advertising growth. AWS remains the profit engine, but investors want to see how much operating leverage Amazon can wring from its e-commerce and ads businesses while simultaneously ramping AI-related capital expenditures.
Broadcom’s quarterly filing for its fiscal first quarter ended February 2, 2026, separates semiconductor revenue from infrastructure software and highlights the company’s growing exposure to custom AI accelerators and networking chips used in hyperscale data centers. Broadcom has become a bellwether for enterprise AI demand beyond NVIDIA, and its results will signal whether that demand is broadening or starting to plateau.
NVIDIA’s most recent 10-K, filed in late February 2026, confirmed the enormous scale of its data-center business and outlined capital commitments tied to next-generation GPU architectures. Intel’s 10-Q for the quarter ended March 29, 2026, disclosed progress on foundry services and client-computing segments. Intel’s presence among the top five contributors is the cycle’s biggest surprise: the stock is up more than 40% year to date, reflecting a market that is pricing in a successful turnaround before the financial results fully confirm one.
The risks of a market this narrow
When a handful of stocks carry an entire index, the math cuts both ways. The same concentration that has powered the S&P 500 higher means a guidance cut or margin miss from Alphabet, Amazon, or Broadcom this week could drag the index down by a magnitude that seems outsized relative to a single company’s report. For anyone holding a broad index fund, diversification offers less cushion than it appears on the label, because those funds are effectively leveraged bets on mega-cap AI winners.
Macro risks compound the picture. If the U.S. economy slows or if corporate customers begin stretching out data-center buildout timelines, the AI spending cycle that has justified these valuations could decelerate faster than current stock prices reflect. No SEC filing can answer whether today’s capital commitments will deliver the returns baked into current multiples, or whether rising competition will compress margins as more suppliers fight for share in AI chips, cloud services, and enterprise software.
Trade policy adds another variable. The Commerce Department’s Bureau of Industry and Security has tightened export controls on advanced semiconductors multiple times since 2022, and further restrictions remain possible. Tariff escalations could also disrupt supply chains for NVIDIA and Broadcom, both of which depend on global manufacturing partners and sell into markets worldwide.
Three numbers that will move the index this week
For investors watching this week’s reports, three data points matter most.
Forward guidance. Management commentary about second-half 2026 AI spending plans, cloud capacity expansion, and chip demand will move share prices more than backward-looking revenue beats. Markets have already priced in strong recent quarters; what they have not priced in is any slowdown.
Capital expenditure figures. Any sign that spending is accelerating without a corresponding revenue payoff will raise pointed questions about return on invested capital. Alphabet and Amazon have both flagged massive capex programs, and investors will want to see those dollars converting into bookings.
Margin trends. Gross and operating margins will reveal whether pricing power is holding or whether competition from AMD, custom silicon efforts at Meta and Microsoft, and emerging cloud rivals is beginning to erode it.
The S&P 500’s 2026 story so far has been written by five companies. This week, three of them step up to report. What they say about the months ahead will determine whether the index’s gains hold, widen, or start to come apart.
Warren Cohen is a finance writer based in Phoenix, Arizona, covering personal finance topics including credit, banking, and beginner investing. He earned his degree in business administration from Arizona State University and began his career working in consumer finance, where he gained direct experience with lending and credit systems. He now writes for personal finance websites and fintech platforms, focusing on clear, practical content that helps readers make informed financial decisions.
