S&P Global has completed its acquisition of OpenZeppelin, the blockchain security firm founded in 2015, closing a transaction first announced on September 17, 2026 in under six weeks. Financial terms were not disclosed, and S&P Global said it does not expect the deal to have a material impact on its financial results.
OpenZeppelin will keep its name and operate as a distinct business unit. Founder Demian Brener stays in charge and will report to Yann Le Pallec, president of S&P Global Ratings. The company said its open source contract libraries will remain free and publicly maintained, and that its audit and secure development services will continue with the existing team. Clifford Chance and Jefferies advised S&P Global; FT Partners and Cooley advised OpenZeppelin.
S&P Global said the acquisition complements its risk assessment capabilities in digital asset markets and supports new onchain security assessments and benchmarks. The companies said OpenZeppelin’s security team has completed more than 900 engagements and identified over 10,000 vulnerabilities before production, and that its contracts library underpins more than $38 trillion in value transferred, including many of the largest stablecoins and tokenised funds. Those figures are the companies’ own statements.