[ProjectArcturis]

You seem to be confusing "listing" - the stock exchange where a company chooses its stock to trade (i.e. NYSE, AmEx, Nasdaq) with "indexes" - a list of stocks that is often the basis for index funds.

The Nasdaq 100 is not the same as Nasdaq. A company can be in many indexes but only one listing. There may have been competition for the listing but there is not competition between indexes for inclusion.

[TazeTSchnitzel]

The implication is that Nasdaq (company) changed the rules for the Nasdaq 100 (index) in order to get the listing on Nasdaq (stock exchange).

[johanvts]

Many companies are listed in multiple exchanges. Unilever, Shell, AstraZeneca, BP, and many more.