At Unusual, we invest in technical founders building the foundational infrastructure for the next wave of intelligent applications. Chalk is exactly that kind of company.

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We’re excited to continue our partnership in Chalk’s $50M Series A. We’ve been with Chalk since the very beginning — backing the team from day one and now doubling down in this new chapter of growth.

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This is the third time we’ve partnered with founders Elliot, Andy and Marc and this is undoubtedly their boldest venture. I’ve known them since they were students, and it’s been a privilege to witness their evolution as entrepreneurs and technologists over the years. From the beginning, we believed in their ability to solve one of the hardest and most valuable problems in machine learning and artificial intelligence: delivering fresh, real-time data to production models and applications.

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Chalk’s solution makes what’s traditionally been a slow, complex, and fragile process into something fast, elegant, and production-ready — with the developer experience front and center.

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At Unusual, we’ve always believed that research-rooted infrastructure leads to the largest and most enduring companies. Chalk is proving that out, delivering sub-10ms performance while enabling teams to build directly in Python, without the tradeoffs that have slowed down ML in the past. They’re not just making real-time ML possible — they’re making it practical at scale.

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Congratulations to the entire Chalk team on this milestone. We’re proud to continue building together. Onwards!