73 Strings, the AI-powered valuation and portfolio intelligence platform for alternative asset managers, has acquired Callisto, a Paris-based fintech company whose AI & data technology automates complex private markets workflows, from due diligence and data room analysis to the preparation of investment documentation and due diligence questionnaire automation.

The platform leverages proprietary agentic data pipelines, including custom embedding models trained for financial documents, agentic orchestration, a financial AI harness enabling agents to work with complex Excel files, data rooms, DDQs and large proprietary internal databases. By providing a structured environment in which AI agents can operate, Callisto enables GPs to scale and accelerate their processes.

“Our ambition is simple: to be the infrastructure private capital runs on. That means AI at the core of the platform, and the people who can build it — shipping new features fast, and at the enterprise-grade standard our industry operates at,” said Yann Magnan, co-founder and CEO of 73 Strings. “Callisto is the latest expression of that ambition. Charles and William have built one of the strongest private-capital-focused AI teams in Europe, and they now lead AI Product for the deepest data and workflow asset in private markets.”

The Callisto team will accelerate the evolution of 73 Strings’ Valuation, Extraction and Monitoring platforms into agent-addressable platforms, built around the Model Context Protocol (MCP) so AI agents can access data and execute workflows and directly bring automation safely into the valuation process, with traceable calculations, a deterministic core valuation engine and with human judgement remaining central to valuation decisions.

To deliver this, the team will lead AI product, starting with building simulation into 73 Intelligence, AI applied to the workflow-heavy processes of private markets, allowing clients to model how portfolios, valuations, and fund-level outcomes behave under changing macro and market assumptions and get an auditable answer in minutes rather than weeks. As private markets mature, portfolio analysis must move beyond reporting what has already happened to modelling what could come next. Callisto’s core AI infrastructure will be integrated into 73 Intelligence in the coming months.

Callisto’s team of AI engineers joins the 73 Strings product organization, with founders Charles Farhat and William Profit appointed Co-Heads of AI Product, reporting to Chief Product Officer Matt Storey. Profit previously worked for Bloomberg, scaling FX with distributed systems to manage trillions of dollars of transaction volume and at Motive Partners in private credit technology, having studied computer science and AI at Imperial College London. Farhat’s background is in applied mathematics and nuclear engineering at ENSTA Paris and Ecole Polytechnique, with prior deep tech and AI experience in building next generation-robotics for defense applications.

“We founded Callisto on a simple conviction: asset managers can only unlock the full value of AI once their data lives in a structured, single source of truth. That digital layer is what makes AI-native products and agents possible, and it’s what will allow asset managers to scale as private markets open up to retail investors,” said William Profit and Charles Farhat, Co-Founders of Callisto. “Joining 73 Strings gives us the opportunity to combine that technology with deep private markets expertise and global scale, accelerating our shared vision for how AI can transform investment workflows for private markets firms of all sizes and strategies.”

The acquisition is part of a broader increase in investment as 73 Strings rapidly scales to meet growing demand across private markets. Over the past quarter, the company has hired senior engineering and product leaders from leading software and AI companies. These investments will embed AI further and faster across the platform and accelerate the delivery of new capabilities, with the enterprise-grade auditability, reliability and rigor private capital firms require.

“73 Strings has demonstrated a clear commitment to investing in the technology and talent required to build the next generation of private markets infrastructure,” said Jade Mandel, Managing Director at Goldman Sachs Alternatives. “The acquisition of Callisto is a strong example of that strategy in action, adding differentiated AI capabilities while demonstrating a thoughtful approach to using both organic investment and strategic M&A to accelerate growth.”

73 Strings is a leading provider of valuation and portfolio intelligence software, serving clients representing $20 trillion in AUM, including nine of the ten largest private-capital firms in the world. The platform provides the infrastructure for valuations and portfolio management across private equity, private credit, infrastructure and venture capital, helping teams scale their operations as portfolios grow in size and complexity.

The acquisition is the company’s latest milestone following $55M Series B in 2025 led by Growth Equity at Goldman Sachs Alternatives, with continued support from Blackstone Innovations Investments and participation from Golub Capital, Hamilton Lane, Broadhaven Capital and 7RIDGE. 73 Strings is additionally supported by HSBC Innovation Banking.

About 73 Strings.

73 Strings is the AI-powered valuation technology company transforming how private capital firms manage data, monitor portfolio performance and deliver institutional-grade Net Asset Values. Purpose-built for alternative investments, its platform, 73 Intelligence, combines intelligent data extraction, standardization and labelling, portfolio monitoring and observability and deterministic AI-powered valuation workflows, replacing fragmented manual processes with a single, governed platform. 73 Strings is building the next-generation data infrastructure for private markets, bringing together the metrics, valuations and insights that inform how investment opportunities are assessed, performance is measured and capital is allocated.

Trusted by many of the world’s leading alternative asset managers and supported by leading global Valuation Advisory and Audit organizations, 73 Strings supports private equity, private credit, growth equity, venture capital, and infrastructure clients managing more than $20 trillion in assets across private and public markets. Built by valuation practitioners, the platform combines deep private markets expertise with enterprise-grade governance to deliver transparent, reproducible and fully auditable valuations at scale.

In February 2025, 73 Strings closed a $55 million Series B led by Goldman Sachs, with continued support from Blackstone Innovations Investments and participation from Golub Capital, Hamilton Lane, Broadhaven Capital and 7RIDGE.

Founded in France in 2020 and headquartered in New York, 73 Strings has offices in New York, San Francisco, London, Paris, Riyadh, Abu Dhabi, Singapore, Bengaluru and Hyderabad, supporting a global client base.

The company’s leadership team and advisors bring more than 300 years of combined experience across private markets, valuation, and financial advisory.

Learn more at www.73Strings.com.

About Callisto.

Callisto is the AI operating system for private markets, purpose-built for leading European private equity and private credit firms, working with over $200B in AUM. Its Data & AI platform structures and connects internal and external data to accelerate due diligence, streamline portfolio management and transform investment workflows. By bringing intelligence into the full investment lifecycle, Callisto helps firms make faster, better informed decisions and focus on where their expertise creates the most value.

Advisers

Pragma Partners acted as legal counsel to 73 Strings, and Quest Avocats acted as legal counsel to Callisto in connection with the transaction.

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