Exchange-traded funds offer a convenient way to invest in sectors or niches that interest you. If you're drawn to mid-cap stocks because they're somewhat proven and yet tend to still have plenty of room for further growth, the Guggenheim S&P Midcap 400 Pure Growth ETF
ETFs often sport lower expense ratios than their mutual fund cousins. The mid-cap ETF's expense ratio -- its annual fee -- is a relatively low 0.35%.
This ETF has performed rather well in its somewhat young life, handily outperforming the S&P 500 over the past three and five years, on average -- and so far this year, as well. As with most investments, of course, we can't expect outstanding performances in every quarter or year. Investors with conviction need to wait for their holdings to deliver.
What's in it?
Plenty of mid-cap growers had strong performances over the past year. Regeneron Pharmaceuticals
Data integration specialist Informatica
Other companies didn't do as well last year, but could see their fortunes change in the coming years. Green Mountain Coffee Roasters
The big picture
A well-chosen ETF can grant you instant diversification across any industry or group of companies -- and make investing in and profiting from it that much easier.
Longtime Fool contributor Selena Maranjian, whom you can follow on Twitter, owns shares of Starbucks and Microsoft, but she holds no other position in any company mentioned. Click here to see her holdings and a short bio. The Motley Fool owns shares of Oracle, Starbucks, and Microsoft. Motley Fool newsletter services have recommended buying shares of Microsoft, Informatica, Monster Beverage, Starbucks, and Green Mountain Coffee Roasters, as well as creating a bull call spread position in Microsoft, a lurking gator position in Green Mountain Coffee Roasters, and writing covered calls on Starbucks. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.