Astor

Building @astorinvest | GSB '25

Astor is an SEC-registered investment advisory app that connects to a user's existing brokerage accounts and delivers personalized portfolio guidance through a conversational AI you can call, text, or check on through a daily digest. It is built for the millions of American households that the traditional advisory industry has left behind, where typical advisors require $500,000 or more in assets just to take a client on, while only about 35% of Americans work with one . The launch coincides with a $5M seed round led by Monashees, with participation from Y Combinator, Goodwater Capital, Gilgamesh Ventures, 468 Capital, Valutia, Sunshine Lake, and executives from Stripe and OpenAI . The company was founded by Bruno Koba and Daniel Tulha, who met as Brazilian transplants in the US. Koba previously worked as a fintech investor at Monashees and as a data scientist at Nubank, where he built machine learning models to scale credit to millions of Brazilians, while Tulha was a software engineer at Stripe and Robinhood, building financial infrastructure at global scale. The pair joined Y Combinator's Summer 2025 batch to build Astor. The platform evaluates holdings across performance, risk, and diversification, delivers tailored recommendations based on what the user owns, and operates under a fiduciary duty to act in clients' best interest, setting it apart from social media advice and generic AI chatbots. Why this launch matters right now: since launch, Astor has attracted thousands of users and more than $200 million in connected brokerage accounts , and the founders are pitching into a moment when retail participation is rising but behavior often looks speculative. Astor offers guidance for general portfolio construction, but can also take a customer's broader financial situation into account, including the need to manage credit card expenses or plan for a wedding. Koba has noted that the product is built on a multi-agent architecture that draws on Anthropic models , and the new capital will be used to grow Astor's product, engineering, and growth teams, and expand its service lines .

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