LONDON, UK, Nov 10, 2026 – Rillet has expanded into the UK, opening an office in central London and beginning a team to support finance customers across the UK and Europe. The expansion follows Rillet’s $100 million series C funding round less than three months earlier, which valued the company at $1 billion. ICONIQ led the round, with participation from Sequoia and Andreessen Horowitz.
Rillet serves nearly 1,000 customers across 75 countries. Its customers in the UK and Europe include Black Forest Labs, Temporal and Primer. Rillet provides an agentic platform for finance teams, including ERP software. The company has plans of hiring in London to support customers across the region.
“When I joined Black Forest Labs, I really wanted to build a finance function that embodied our companies’ ambition of pushing the frontier of what was possible. We chose Rillet for our ERP because they matched that ambition. Our tech stack needs to have AI at its core and that extends beyond features like MCP connectivity. We need AI that’s built into the architecture, with reliable data that we can both act on and interact with. Rillet provides all of this,” said Dave Arkell, CFO at Black Forest Labs.
Rillet is also bringing its Close Club community to Europe. The initiative currently connects more than 1,500 finance leaders in the United States, providing a forum for chief financial officers to exchange experiences and discuss financial management challenges. LinkedIn included Rillet in its 2026 Top Startups list of 50 U.S. companies.
“Within a year of launching in the US, we already had finance teams in the UK running on Rillet,” said Nicolas Kopp, CEO and founder of Rillet. “Those teams are building some of Europe’s most ambitious companies, and they deserve a finance partner that keeps up with them. Finance leaders want to know the people behind their systems are close by and committed to them, and a London team lets us be exactly that.”
Rillet’s expansion builds on existing relationships with accounting and professional services firms operating internationally. These include an alliance with EY and RSM and partnerships with more than half of the firms listed in Accounting Today’s top 20 CPA firms.
Nicolas Kopp studied accounting at the London School of Economics and worked in London for several years. Rillet’s existing accounting partnerships provide a foundation for expanding its network across Europe, the Middle East and Africa.
Source: Rillet
About Rillet
Rillet is a U.S. software company founded in 2021 and headquartered in San Francisco, CA. The company develops cloud-based accounting software that uses AI to automate financial processes, including bookkeeping, journal entries, reconciliations and financial reporting. Its platform helps finance teams manage transactions, prepare reports and consolidate accounting data across multiple entities, currencies and countries. Rillet serves startups, private companies and publicly traded enterprises in industries including technology, health care, financial services, retail and biotechnology. Its software integrates with payment, payroll, sales and expense management systems to consolidate financial information. Nicolas Kopp is the company’s founder and CEO. Rillet operates offices in San Francisco, New York and London. The company reports serving nearly 1,000 customers across 75 countries.
