The fastest, ultra-realistic voice AI platform.
Cartesia is a startup that creates voice-first AI tools to help teams prototype quickly and scale up without needing to change their main systems. Their main product, Sonic, is a text-to-speech engine that streams natural voices with emotion and laughter in many languages. They also offer Line, a platform for developers to build voice agents using code-first tools and an SDK. With these products, companies and creators can build voice apps, automated customer support, audio content, and interactive multimedia experiences.
Cartesia is a young company. Its founders met as PhD researchers at Stanford and shifted from lab research to product development in 2023. In December 2024, the startup announced a $27 million seed round led by Index Ventures and several angel investors. Just a few months later, in March 2025, Cartesia raised a $64 million Series A led by Kleiner Perkins, moving the company into a major growth phase. These funding rounds show that established venture capitalists see strong potential in Cartesia’s voice model approach.
Cartesia has grown quickly for such a young startup. In under two years, the team released public demos, added new voice models, and launched developer tools and APIs for real-time text-to-speech and voice agents. Their partnerships with major industry players and new product launches show strong momentum and a clear shift from research to real-world products.
Although they’re a privately held business, it is possible to buy Cartesia equity OTC through Acquire.Fi’s OTC and Secondaries marketplace. We connect existing shareholders with qualified buyers and facilitate the transaction from start to finish.
To begin, simply browse available deals to find opportunities that match your criteria, then click Make an Offer. You can also submit a custom bid and set the terms to buy a minority stake in Cartesia.
If you already own a stake in the business and want to sell privately, you can list your shares on the same marketplace. You have the option to create a new offer to sell Cartesia equity OTC or explore current offers from active buyers.
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