Case Study: How Trading 212 Scaled Across 13 Markets in 8 Months With Fourthline  

Trading 212, one of Europe’s fastest-growing investment platforms, expanded into 13 European markets in just 8 months by partnering with Fourthline. Central to this success was Fourthline’s unique position as a regulated entity, enabling Trading 212 to rely on Fourthline’s regulatory license to accelerate market entry. 

Most onboarding providers offer technology only. Fourthline is different because it is regulated itself. This meant Trading 212 could move faster, stay fully compliant, and deliver a smooth, local onboarding experience across Europe.  

The Challenge 

By 2025, Trading 212 had established itself as a leading investment platform across Europe. To sustain its growth trajectory, Trading 212 needed to expand quickly into additional European markets while preserving a frictionless onboarding experience and high conversion rates. 

However, expansion in regulated financial services is typically slow and resource intensive. Each new jurisdiction often requires separate licensing, local compliance frameworks, and operational setup, creating delays, higher costs, and inconsistent customer experiences. Trading 212’s challenge was to scale across multiple markets simultaneously and fast without compromising compliance, efficiency, or user experience. 

“Expanding into 13 European markets in under a year would have been inefficient through traditional licensing routes. Fourthline’s reliance model didn’t just accelerate our expansion; it fundamentally changed how we think about European growth. By trusting Fourthline with our onboarding infrastructure, we were able to focus our resources on what matters most: delivering an exceptional investing experience to our clients.” —Teodor Kralev, Trading 212  

The Approach

In May 2025, Trading 212 engaged Fourthline to explore the expansion into three initial markets: France, Luxembourg, and Austria. Rather than presenting a single solution, Fourthline prepared a comprehensive proposal outlining two distinct operational models, each with different implications for speed, cost, control, and compliance. The first option was the outsourcing model, where Trading 212 could either obtain their own regulatory licenses in each target market or as a second alternative they could passport from an existing European jurisdiction, and outsource the operational execution of onboarding to Fourthline. 

The second option was the reliance model, where Trading 212 would leverage Fourthline's existing license as a Dutch payment institution in accordance with Article 25 of AMLD4. For these purposes, Fourthline establishes relationships with Trading 212’s end clients and onboards these clients pursuant to Dutch anti-money laundering rules. This approach would enable significantly faster market entry but would require a higher degree of trust in Fourthline as a partner. 

Fourthline's proposal included detailed analysis of the operational, regulatory, and conversion implications of each approach. This included projections on time to market, regulatory requirements in each jurisdiction, operational workflows, technical integration requirements, and expected impact on conversion rates based on different onboarding flows. 

By June 2025, after evaluating both options, Trading 212 selected the reliance model for their expansion strategy. The decision was driven by several factors. First, time to market was critical for Trading 212's growth objectives, and the reliance model eliminated the lengthy process of obtaining individual market licenses. Second, the reliance model offered operational simplicity through a single integration point that could serve multiple markets. Third, Fourthline's proposed identity-verification-only flow that promised to minimise user friction while maintaining full regulatory compliance. 

Implementation and Expansion 

What began as a three-market rollout quickly scaled across Europe. Following the initial launch in France, Luxembourg, and Austria in June 2025, Trading 212 rapidly added additional jurisdictions. 

Within 8 months, Trading 212 launched in ten more markets, including the Netherlands, the Nordic region, Switzerland, Liechtenstein, Spain, and most recently Portugal, bringing the total to 14 markets by August 2026. During this period, Trading 212 maintained an outsourcing setup for Germany. 

Results and Impact 

By now, Trading 212 had onboarded almost 200,000 clients with Fourthline across reliance-based markets. Rapid expansion did not come at the expense of performance: streamlined, localised onboarding flows reduced friction and supported strong conversion rates across all jurisdictions. 

Operationally, the reliance model delivers significant efficiency gains. Rather than managing thirteen separate regulatory frameworks, Trading 212 relied on Fourthline’s centralised, regulated infrastructure, reducing overhead and allowing teams to focus on product development and customer experience. 

Key Takeaways 

The Trading 212 case demonstrates that regulatory infrastructure can be a strategic advantage rather than a constraint. Fourthline’s status as a regulated entity fundamentally changes how fintechs can scale across Europe, enabling reliance-based expansion that competitors without regulatory authorisation cannot replicate. 

For fintech and investment platforms expanding across Europe, this case highlights a clear distinction in the market: while most providers offer onboarding technology, Fourthline delivers regulated onboarding infrastructure, enabling faster, more efficient, and more scalable expansion.