73 Strings, a valuation and portfolio-monitoring platform for alternative asset managers, has acquired Callisto. Callisto sells software that uses artificial intelligence to review data rooms, answer due diligence questionnaires and draft investment memos for European private equity and private credit firms. The company is based in Paris.
Callisto co-founders Charles Farhat and William Profit join 73 Strings as co-heads of AI product. New York-based 73 Strings raised a $55 million Series B in February 2025 led by Goldman Sachs Alternatives, with Blackstone Innovations Investments, Golub Capital and Hamilton Lane among its other investors. CEO Yann Magnan said AI sits at the core of the platform.
