Why Tandem Diabetes Care Stock Jumped Today

Shares of Tandem Diabetes Care (NASDAQ: TNDM) were jumping 12.9% higher as of 3:51 p.m. EDT on Tuesday. The gain came after S&P Global announced that the stock would be added to the S&P MidCap 400 Index effective Sept. 20.

There's one big advantage that mid-cap stocks obtain from being added to the S&P MidCap 400 Index. Any mutual fund or exchange-traded fund that tracks the index must add the stocks to their holdings.

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Source Fool.com