A top performing Japanese fund run by investment firm Asset Management One says it is looking to build stakes in some small and midsized caps as valuations become more appealing.

The fund is also holding on to some of its artificial intelligence-related shares even after multifold gains, Tomonobu Sekiguchi, fund manager at the Asset Management One Best Selection Japan, said in an interview.

"The investment appeal is increasing for small and mid-cap stocks with price-to-earnings ratios below 20 times with solid growth potential,” Sekiguchi said. "I look into companies with a high likelihood of actually growing earnings.”