Mid-cap growth mutual funds make excellent choices for investors who emphasize investing in securities that offer growth at a lesser risk. While large companies are normally known for stability and smaller ones for growth, mid-caps offer the best of both the worlds, allowing growth and stability simultaneously.

Companies with market capitalization between $2 billion and $10 billion and solid growth prospects are generally considered while designing a portfolio of mid-cap growth mutual funds. Also, focusing on growth securities allows these funds to provide more returns, as growth stocks refer to high quality investments with the potential to garner revenue and earnings growth at a rate faster than the industry average.

Below we share with you three top-rated mid-cap growth mutual funds. Each has earned a Zacks Mutual Fund Rank #1 (Strong Buy)and is expected to outperform its peers in the future. Investors can click here to see the complete list of mid-cap growth funds.

Voya MidCap Opportunities Port S (ISMOX - Free Report) invests the majority of its assets in securities of mid-cap companies. The fund normally invests in those companies that are believed to have above-average growth prospects. Voya MidCap Opportunities Port S has a three-year annualized return of 0.9%.

ISMOX has an expense ratio of 1.06% as compared to the category average of 1.26%.

Dreyfus Mid-Cap Growth F (FRSPX - Free Report) seeks capital growth. FRSPX invests the majority of its assets in securities of companies that fall within the market-cap range of the Russell Midcap Growth Index. The fund invests not only in domestic companies but also in foreign companies. Dreyfus Mid-Cap Growth F has a three-year annualized return of 5.3%.

Robert Zeuthen is the one of the fund managers since 2010.

T. Rowe Price Diversified Mid Cap Growth (PRDMX - Free Report) maintains a diversified portfolio by investing heavily in mid-cap companies that are believed to have above-average earnings growth potential. PRDMX focuses on acquiring common stocks of companies having market capitalization similar to those included in the S&P MidCap 400 Index or the Russell Midcap Growth Index. T. Rowe Price Diversified Mid Cap Growth has five-year annualized returns of 8.2%.

PRDMX has an expense ratio of 0.87% compared with the category average of 1.26%.