Walmart’s $19 Billion Nasdaq 100 Index Boost May Have to Wait

Walmart Inc. ditched the New York Stock Exchange for arch-rival Nasdaq this week, marking the largest defection of a stock listing in the Big Board’s history.

Now, the question on investors’ minds is when the retailer will be added to the influential Nasdaq 100 Index. Anyone hoping for that to happen Friday evening as part of an annual reconstitution of the index may be disappointed, according to analysts.