The S&P 500 has officially become a tech index wearing a trench coat. As of June 3, 2026, the Information Technology sector reached 39.4% of the index’s total market capitalization, a figure that eclipses even the frothiest days of the dot-com bubble.
To put that 39.4% figure in perspective, the previous record was roughly 35%, set in March 2000. The current number doesn’t just break that record. It obliterates it by more than four percentage points.
The Magnificent Seven are doing the heavy lifting
The usual suspects are driving this concentration. The so-called Magnificent Seven, Nvidia, Microsoft, Apple, Amazon, Alphabet, Meta, and Tesla, collectively account for approximately 32-35% of the entire S&P 500 in early June 2026. That means seven companies out of 500 represent roughly a third of the index’s value.
Zoom out slightly to the top 10 holdings, which includes names like Broadcom alongside the Mag Seven, and you’re looking at 38-40% of total index weight. In other words, the remaining 490-odd companies in the S&P 500 are splitting the leftover 60% among themselves.
