[tomatocracy]

I don't think it's about lack of capital but higher valuations. For reasons which don't seem to be well understood, investors on US markets seem to be willing to bid higher multiples than investors on UK and most other markets.

[kypro]

More liquidity. No stamp duty on share purchases. Prices denominated in the world's reverse currency. Access to the largest market institutional investors.

[3cats-in-a-coat]

Markets are more accessible and more popular to retail. Retail is stupid. Case in point: Tesla.