Letter AI Raises $40M Series B

Chicago-based startup Letter AI, last week announced it raised $40 million in a Series B round as companies increasingly look to apply artificial intelligence directly to sales and revenue operations.

Battery Ventures led the financing, which comes only four months after the company’s previous raise. Other participants include Y Combinator, Lightbank, Northwestern Mutual Future Ventures, Stage 2 Capital, alongside existing investors. Letter AI noted in their announcement that the capital will be used to accelerate product development, expand its workforce internationally, and scale go-to-market efforts.

Letter AI offers what it calls an “AI-native” revenue enablement platform integrating content, coaching, learning, and CRM data to offer real-time, deal-specific guidance to sales teams. The company said the new funding will support broader deployment of Letter Compass - a product launched alongside the round - that it describes as delivering contextual guidance for active opportunities by combining enablement materials with live customer interactions and CRM signals.

Co-founder and CEO Ali Akhtar said that "revenue enablement is a perfect problem for an AI-native platform because it sits at the intersection of content, people, and live decision-making," adding that "legacy tools were built for static libraries and periodic training. We built Letter AI for modern sales teams who need guidance that is personalized, contextual, and available in the moment a deal is happening." 

The company was founded by Akhtar and CTO Armen Forget and is headquartered in Chicago. The company says its platform supports revenue teams across more than 30 countries. With this round, Letter AI joins a growing field of startups and established vendors positioning AI as a way to move playbooks, training, and content closer to the point of sale. How quickly enterprise buyers in particular can adopt such systems, and how measurable the impact on sales cycles and win rates will be, are likely to determine whether the market consolidates or remains fragmented.

Brandon Gleklen, Principal at Battery Ventures said that Letter AI “wasn't designed as a content repository or an AI add-on – it was built from the ground up as an AI-native platform that delivers real, measurable impact at the deal level. That's what modern revenue teams are looking for."

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