BHP is a $152 billion market-cap resources company with operations in Australia, Europe, China, Japan, India, South Korea, the rest of Asia, North America, and South America.

Source: https://seekingalpha.com/article/4591460-pick-undervalued-metals-miners-etf-yields-6-7-percent?source=feed_all_articles

Even though it ignores small and mid caps, the S&P 500 is a reasonable passive benchmark within the US (because of the market-cap weighting, long-term returns on the S&P 500 and broader benchmarks like the Russell 3000 are fairly close).

Source: https://seekingalpha.com/article/4567756-voo-one-of-the-best-s-and-p-500-etfs-but-far-from-truly-passive?source=feed_all_articles

It currently holds about 115 stocks in its market-cap weighted portfolio.

Source: https://247wallst.com/investing/2023/06/22/leading-indian-etf-could-be-a-short-squeeze-candidate/

The company has a market-cap of $36.2 million.

Source: https://www.dailypolitical.com/2023/02/04/bullfrog-ai-holdings-inc-bfrg-to-raise-8-million-in-ipo.html

“These index providers also implement buffers to limit deletions and additions along the lower market-cap bound, further reducing turnover.

Source: https://www.etftrends.com/esg-channel/education-mid-caps-could-be-fruitful-investors/