OpenSea
OpenSea is a NFT, Gaming & Consumer company founded in 2017 and based in New York, United States. It has raised $427.2M in total funding, most recently a Series C in 2022 at a $13.3B valuation.
Founded in 2017 by Devin Finzer and Alex Atallah, OpenSea became the dominant peer-to-peer marketplace for non-fungible tokens during the 2021-2022 NFT boom, reaching a $13.3 billion valuation in its January 2022 Series C. In 2025 the company rebuilt its product as OS2, expanding from NFTs to token trading across 19 chains, and in July 2025 acquired mobile wallet startup Rally, whose CEO Chris Maddern became OpenSea's CTO. The pivot paid off: October 2025 was a record month with roughly $2.6 billion in volume, about 90% of it from token trading. The OpenSea Foundation had announced a SEA token with rewards and revenue-sharing, but on March 16, 2026 the company delayed the token launch indefinitely. The company is backed by a16z, Paradigm and Coatue.
OpenSea defined the NFT marketplace category and its OS2 pivot to multichain token trading is a bellwether for whether consumer crypto can broaden beyond collectibles.
opensea.io ↗·NFT, Gaming & Consumer·
United States·private 
