BOSTON (TheStreet) -- The small-cap Russell 2000 Index has climbed 4% in the past three months, and the S&P 500 Index of the biggest U.S. stocks has risen 6%.In the same period, TheStreet.com 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.