Shares of Duolingo, Inc. (DUOL) are soaring 5.84% in pre-market trading on Monday, as investors continue to show enthusiasm for the language learning app's strong performance and growth trajectory. This surge comes on the heels of the company's impressive fourth-quarter results and significant user base expansion.

Duolingo, founded by a Carnegie Mellon computer science professor and his Ph.D. student, has been making waves in the online education sector. The company recently reported Q4 revenues of $209.6 million, representing a robust 38.8% year-over-year growth and surpassing analysts' expectations by 2.1%. This outstanding revenue performance was the fastest among its peers in the consumer subscription stocks category.

Perhaps even more impressive is Duolingo's user growth. The company reported 116.7 million users, marking a substantial 32% increase compared to the previous year. This rapid expansion of its user base demonstrates the app's growing popularity and effectiveness in attracting language learners worldwide. While the company's EBITDA guidance for the next quarter was slightly below analysts' expectations, investors seem to be focusing on the strong top-line growth and user acquisition as indicators of Duolingo's future potential in the competitive online learning market.