Affirm's shares surged 16 in after-hours trading on Wednesday following better-than-expected fiscal fourth-quarter results. The fintech company reported a smaller-than-expected loss per share and exceeded revenue expectations. Gross merchandise volume rose while revenue climbed year-over-year. Affirm's net loss narrowed from a year ago. Affirm's partnerships with Apple, Amazon, and Shopify drive growth, with a UK launch planned by year-end.