• Shares of Affirm and SoFi soared on Thursday after both fintech companies posted their latest quarterly numbers.
• Affirm also announced Wednesday it will expand its buy now, pay later partnership with Amazon.

Shares of fintech companies Affirm and SoFi soared Thursday after both companies posted their latest quarterly numbers

Affirm shares closed up 13.7% on Thursday after the buy now, pay later company reported revenue of $269.4 million, and beat a Refinitiv estimate of $248.2 million. Affirm also reported a quarterly loss per share of $1.13.

The company's stock soared as high as 30% after hours Wednesday after Affirm said it's expanding its partnership with Amazon. Through the agreement, Affirm will serve as the sole third-party buy now, pay later option for Amazon nationwide, although credit card companies will be able to offer buy now, pay later options in the future. The company also saw active consumers grow 124% to 8.7 million.

"BNPL has arrived in a sense that half of Americans are fully aware of what it is and are considering using it or are using it," CEO Max Levchin told CNBC's "TechCheck" on Thursday, referring to buy now, pay later. "It's no longer just for this demographic or that. It's both Gen Z and Gen X and everyone in between."

SoFi shares also rallied 12.49% after the digital bank reported better-than-expected quarterly results Wednesday evening. SoFi reported a loss of 5 cents per share in the third quarter, beating a Refinitiv forecast for a loss of 14 cents per share. Revenue also beat Wall Street estimates of $251.6 million, coming in at $277.2 million.

The company's diversified business model — which dabbles in lending, investing and a range of financial services that benefit in stay-at-home and opening environments — allowed it to beat on revenue, CEO Anthony Noto told CNBC's "Squawk Box" on Thursday.

"We are the only one-stop shop for digital financial services so it allows us to meet members when they have a need," he said.

SoFi also saw its total products more than double year-over-year to 4.3 million, while members increased over the previous quarter.

Analysts at Jefferies maintained a buy rating on SoFi and raised their price target to $26 for the stock as the company upgraded its revenue outlook for the current quarter and its continued growth.

"We will continue to follow the pace of new account growth as well as momentum within the financial svcs segment, and Galileo which we believe is a differentiator for the company as it continues to scale," the Jefferies analysts wrote.

Galileo is financial services and payments platform the company acquired in 2020.

Correction: Updated to reflect the proper spelling of Jefferies.