How London VCs Can De-Risk and Accelerate Their B2B Portcos’ U.S. Expansion

The London Moment

While Dealroom’s 2025 Global Tech Ecosystem Index announced that Paris has surpassed London as Europe’s top tech hub, London remains one of the world’s most established and globally connected startup ecosystems.

According to Dealroom’s UK Guide, the UK tech sector now represents over $1 trillion in ecosystem value and continues to attract international investment and top-tier talent. In Q1 2025, UK startups raised $4.2B, the strongest opening quarter since 2022, with six mega rounds totaling $1.7B (Dealroom & HSBC Innovation Banking, UK Q1 2025).

The capital now counts over 100 unicorns and a rapidly expanding base of AI, SaaS, and FinTech firms. In fact, 12% of UK companies that have raised between $100 million and $250 million have achieved unicorn status—nearly matching the 14% in the U.S., per Tech Nation.

For investors, that momentum signals opportunity. The innovation, efficiency, and engineering excellence are here. But the next growth stage—those larger multiples and liquidity events—still most often happens across the Atlantic.