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Duolingo Inc is a technology company that develops mobile learning platform to learn languages and is the top-grossing app in the Education category on both Google Play and the Apple App Store. Its products are powered by sophisticated data analytics and artificial intelligence and delivered with class art, animation, and design to make it easier for learners to stay motivated master new material, and achieve their learning goals. Its solutions include The Duolingo Language Learning App, Super Duolingo, Duolingo English Test: AI-Driven Language Assessment, Duolingo For Schools, Duolingo ABC, and Duolingo Math. It has three predominant sources of revenue; time-based subscriptions, in-app advertising placement by third parties, and the Duolingo English Test.
Stifel Financial is a middle-market-focused investment bank that produces more than 90% of its revenue in the United States. Approximately 60% of the company's net revenue is derived from its global wealth management division, which supports over 2,000 financial advisors, with the remainder coming from its institutional securities business. Stifel has a history of being an active acquirer of other financial-services firms.