# Five Largest S&P 500 Companies Match Value of Bottom 434 By Enna Lee Canonical URL: https://www.tokenpost.com/news/investing/29106 Published: 2026-10-09T15:31:10.000Z Updated: 2026-10-09T15:31:10.000Z Section: Investing > The comparison highlights how market-cap weighting gives the biggest companies an outsized influence on the benchmark. The five largest S&P 500 companies had a combined market value equal to that of the index’s bottom 434 companies, highlighting the benchmark’s growing concentration in its biggest constituents. Michael Batnick said in a post that the concentration was unlike anything previously experienced. The S&P 500 uses market-cap weighting, which gives larger companies a greater influence on the index. Mega-cap technology companies and businesses tied to artificial-intelligence infrastructure have helped support the benchmark even as many lower-weighted constituents lagged. The comparison follows [weakness in S&P 500 breadth](), with market gains concentrated among a relatively small group of large companies. ## Links in this article - [weakness in S&P 500 breadth](https://www.tokenpost.com/news/investing/25629)