Toebox Korea, which manufactures and distributes related merchandise including toys, also rode the upward trend and saw its shares rise more than 30 percent. Its shares closed at 1,430 won.

Shares of both companies were up on news of the song’s entry on the Billboard Hot 100.

The viral children’s song landed at No. 32 and retained its place the next day.

The two-minute tune with an addictive melody and choreography sparked a surge in SmartStudy’s revenues last year, which have tripled to 27 billion won since its release. The company has said it expects sales to grow 70 percent.

Samsung Publishing is listed on the country’s main bourse Kospi, while Toebox Korea is traded on the secondary, tech-heavy Kosdaq.

By Jung Min-kyung (mkjung@heraldcorp.com)