Mid-Cap Stocks Aren’t Ready for a Starring Role

I can’t open a web browser lately without seeing a banner promoting State Street Corp.’s new digital series “Crazy Enough to Work” starring actress Elizabeth Banks — who, I must confess, I think is fabulous.

The series profiles four midsize companies. The first two episodes showcase EPR Properties and the New York Times Co. and have already been released. The final two feature Dunkin’ Brands Group Inc. and the Boston Beer Co. and will be available on Aug. 29 and Sept. 12, respectively.

It’s all a plug for State Street’s SPDR S&P MidCap 400 ETF, which makes me wonder about those algorithms supposedly customizing my online experience. I’ve never expressed any interest in buying a mid-cap stock fund.

It’s not that I have anything against mid-caps. On the contrary, I own them like nearly everyone else. I’m defining mid-caps as stocks with a market value of $1 billion to $10 billion. If you own a large-cap stock fund, chances are you own some mid-caps, too.

Consider that there are 458 mid-cap stocks in the Russell 1000 Index, which collectively make up 8.9 percent of the index. Mid-caps make up an even bigger chunk of the broader market. There are 1,429 mid-caps in the Russell 3000 Index, accounting for 14.6 percent of the index.

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