Hark, a stealth-mode AI startup founded by Brett Adcock, has closed a $700 million Series A funding round, valuing the company at $6 billion. The funding round was led by Sequoia Capital, with participation from other major investors.
Details about Hark's actual product remain sparse. The company describes itself as building a "universal" AI interface, suggesting it aims to create a unified system for interacting with multiple AI models or services. This positioning echoes earlier waves of AI aggregation tools, though Hark's substantial valuation indicates investors expect something differentiated.
Adcock previously founded Figure AI, a robotics company focused on building humanoid robots. He left that company last year and has now started Hark, signaling a pivot away from physical robotics toward software infrastructure.
The $700 million raise at a $6 billion valuation places Hark among the most well-funded AI startups, despite the company operating largely outside public view. Sequoia's backing carries significant weight in the AI space, where the firm has backed major players including OpenAI and Anthropic.
The secrecy surrounding Hark's technology reflects a broader trend among well-funded AI startups. Rather than racing to launch products publicly, several companies have chosen to develop technology quietly while raising massive rounds from institutional investors. This approach provides runway and reduces pressure to release incomplete work.
The "universal interface" framing suggests Hark may target enterprises or developers seeking to interact with multiple AI models without building custom integrations. This market opportunity exists as companies deploy models from different providers for different use cases.
Investors appear confident in Adcock's ability to execute, given his track record with Figure. However, the startup faces competition from established players like OpenAI and Anthropic, which already offer API access and model services, as well as from AI