The seemingly unstoppable growth of megacaps like Apple Inc. and Microsoft Corp. mean they have breached an upper limit imposed on stocks in the Nasdaq 100. As a result, Nasdaq Inc. has announced a “special rebalance” — the first ever of its kind — will be carried out to redistribute the weight of the index’s members.
America’s biggest tech companies have become too large even for the stock index tracking America’s biggest tech companies.
Now the benchmark’s overseer is taking action to pare back their influence.

