Airwallex, the fintech unicorn backed by Tencent Holdings and tycoon Li Ka-shing’s Horizons Ventures, said its valuation soared to US$5.5 billion following its latest oversubscribed round of fundraising. The company raised US$100 million in its Series E1 funding, which was led by Lone Pine Capital and included investments from 1835i Ventures and Sequoia Capital China. Airwallex raised another US$200 million in Series E funding in September. It has raised more than US$802 million to date. “Our record performance last quarter demonstrates the tremendous demand from customers who are seeking better solutions to operate their businesses,” said Jack Zhang, Airwallex’s co-founder…