The FinTech IPO Index has experienced a 3.9% rally, bringing some cheer in the holiday-shortened trading week.Huize shares have surged 26.4% due to strong earnings and record-high premiums.Sezzle has rebounded with a 12.5% gain after being accused of risky lending practices.Affirm's stock has risen by 5.5% following an expanded partnership with WooCommerce.