>>How are companies chosen for the Nasdaq-100 index? I'm having difficulty finding out. Is it a rules-based system?<<

Well, I just asked Bard (it does seem smarter than me):

The Nasdaq 100 is an index of the 100 largest non-financial companies listed on the Nasdaq stock exchange. Companies are selected for the index based on the following criteria:

They must be listed exclusively on Nasdaq.
They must have been publicly traded for at least three months.
They must have an average daily trading volume of at least 200,000 shares.
They must be current in their quarterly and annual reporting.
They must not be in bankruptcy proceedings.

The index is rebalanced quarterly, and companies can be added or removed from the index based on their performance. The Nasdaq 100 is a popular benchmark for investors, and it is often used as a proxy for the overall health of the Nasdaq stock exchange.

Berkshire Hathaway FAQ

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