RESTON, Va. ( TheStreet) -- The small-cap Russell 2000 Index has climbed 4.1% in the past three months, and the S&P 500 Index of the biggest stocks has risen 5.8%.

In the same period, has recommended several investments that have bested those returns in our "Under the Radar" series. Here are the top-five performing recommendations of the past three months.

1. Carbo Ceramics: ( CRR) After its recommendation on Oct. 23, Carbo Ceramics has gained 33%.

2. Atheros Communications: ( ATHR) After its recommendation on Nov. 24, Atheros has gained 27%.

3. AsiaInfo Holdings: ( ASIA) Since being recommended on Nov. 6, AsiaInfo has gained 24%.

4. China Automotive Systems: ( CAAS) After its recommendation on Dec. 29, China Automotive has jumped 19%. (That's an annualized gain of 5,283%.)

5. National Presto: ( NPK) After its recommendation on Dec. 9, National Presto has risen 18%.

Honorable mentions include Diamond Foods ( DMND) and Compass Minerals ( CMP), which have increased 17% and 16% since being recommended a little more than two months ago.

-- Reported by David MacDougall in Boston.
Prior to joining Ratings, David MacDougall was an analyst at Cambridge Associates, an investment consulting firm, where he worked with private equity and venture capital funds. He graduated cum laude from Northeastern University with a bachelor's degree in finance and is a Level III CFA candidate.