• Morningstar completed the third-quarter reconstitution for Morningstar Market Indexes, which underpin more than $3 trillion in investor assets.
• More than $2 trillion is linked to the Morningstar US Total Market Index, the parent benchmark for the index suite.
• SpaceX entered the indexes five days post-IPO; it reached a $2 trillion market cap on day one, yet was 0.1% of the total-market index.
• Morningstar US Micro Cap Index rose nearly 22% year-to-date through Sept. 4, outperforming other size segments over the past year.
• Top 10 stocks held 35% of total market cap; down from 36% in December 2025, while mega-cap constituents fell to 165.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Morningstar Inc. published the original content used to generate this news brief via Business Wire (Ref. ID: 20260923900015) on September 23, 2026, and is solely responsible for the information contained therein.