Rillet Launches UK Hub Following Unicorn Series C
Rillet, the developer of an agentic enterprise resource planning platform aimed at high-growth finance teams, has opened an office in London.
The move establishes a permanent UK base for the company as European demand generates 10% of its net new annual recurring revenue.
The opening follows a US$100m Series C funding round completed less than three months ago.
Led by ICONIQ with backing from Sequoia and Andreessen Horowitz, the transaction valued the business at US$1bn.
Rillet currently supports nearly 1,000 customers in 75 countries, including publicly traded corporations and technology companies such as Temporal, Primer and Black Forest Labs.
Outside the US, the vendor’s net new ARR has more than tripled month over month.
Within a year of launching in the US, we already had finance teams in the UK running on Rillet,”
Modernising European ledgers
European finance chiefs have increasingly turned to modern ERP architectures to replace legacy software during financial close cycles.
Rather than waiting for local operations to launch, several UK organisations deployed Rillet ahead of the physical expansion.
For organisations operating in high-growth environments, automated close workflows and structured accounting data remain central to controlling headcount growth while meeting reporting deadlines.
- Rillet was listed on LinkedIn’s 2026 Top Startups index of 50 US companies
- The company has reached unicorn status, being valued at US$1bn
- Series C round saw Rillet gain US$100m
- Rillet serves 1,000 customers across 75 countries
- Close Club connects over 1,500 finance leaders in the US.
Scaling city operations
Rillet’s initial UK staff is already operating in central London, with plans to build a large-scale local division.
The business was recently listed on LinkedIn’s 2026 Top Startups index of 50 US companies, reflecting rapid headcount expansion in its domestic market.
Alongside its software, the vendor is introducing its Close Club peer network to Europe.
The community currently comprises more than 1,500 finance executives across the US, offering CFOs a forum to discuss close management, reporting bottlenecks and operating procedures.
“Within a year of launching in the US, we already had finance teams in the UK running on Rillet,” says 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.”
The UK capital represents a familiar market for Nicolas, who studied accounting at the London School of Economics prior to working in the City.
Professional services distribution
A core component of Rillet’s commercial strategy rests on integrations with corporate advisory networks.
The business maintains an alliance with EY, a strategic alliance with RSM and distribution ties with more than half of the Accounting Today top 20 CPA firms.
Because many of these international audit and advisory practices maintain significant operational hubs across the UK and continental Europe, Rillet plans to deploy these existing relationships to build institutional credibility and drive software adoption across the EMEA region.
Key partners:
Protiviti: The pair partnered in the second half of 2026 to meet demand from finance leaders for reporting pressures, scale readiness and closing efficiencies. Rillet provides a ledger for real-time and continuous close architecture, along with AI agents to pair with Protiviti’s controls, governance and advisory.
EY: The organisation maintains a strategic alliance with EY, pairing the advisory firm’s extensive financial transformation expertise with Rillet’s agentic ERP, constructed on a continuous ledger architecture.
Primer: Primer is a key client and user of its agentic enterprise resource planning platform. Rillet highlights Primer alongside leading AI firms to showcase the platform's ability to support modern, high-growth finance operations replacing legacy accounting infrastructure.
Temporal: Temporal is an enterprise software customer using Rillet’s platform to manage its accounting and financial workflows. Rillet officially cites Temporal as an anchor client representing fast-scaling technology businesses with international operations.
