Information Technology sector reaches record 39% of S&P 500 market cap
The share has more than doubled since the 2020 pandemic and now exceeds the roughly 33% peak seen during the 2000 Dot-Com Bubble.
Fact Check
The claim faithfully restates the original Kobeissi Letter post (39% record, more than doubled since 2020, above the ~33% dot-com peak). Independent analysis by Charlie Bilello (June 16, 2026) confirms tech's S&P 500 weighting reached ~40%, a record high exceeding the ~35% March 2000 peak. An earlier Kobeissi post (May 2026) cited 37% as an all-time high, consistent with a steady rise to 39%. The only minor discrepancy across sources is the exact dot-com peak (~33% to ~35%) due to differing index-classification methods, but all sources agree current tech concentration exceeds the 2000 peak, which is the core of the claim.
Summary
The Information Technology sector has grown to a record 39% of the S&P 500's total market capitalization, marking the largest index concentration for any sector cited in the source. That share has more than doubled since the 2020 pandemic and now stands above the roughly 33% peak reached during the 2000 Dot-Com Bubble. The reading underscores how strongly equity market leadership has consolidated in technology, leaving the benchmark increasingly dependent on a single sector's performance.
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