If you invested in the S&P 500 at the start of 2015, by the end of trading today, you would have enjoyed a return of … 1.04%. Yeah, not impressive.

But had you invested in the portfolio of fintech stocks Bank Innovation tracks, you would have scored a return of 39%. Yeah, impressive.

Whether the soaring fintech stocks are a sign of a bubble or not, I can’t say. What I can say is that there are some wildly impressive numbers being posted by publicly traded fintech companies in 2015. To date, here are some noteworthy growth rates:

• LendingTree +107%
• First Internet Bank +91%
• Vantiv +55%
• Total Systems Services (TSYS) +64%

Alas, not every public fintech stock has performed well so far this year. On Deck Capital stands out for its 49% decline in value in 2015 — it IPOed in December 2014. It should be noted that the -49% performance includes a 28% bump in stock price today for ONDK as a result of its new partnership with JPMorgan Chase & Co. to provide small business loans.

The companies in our fintech portfolio are:

• ACI Worldwide Inc
• Bottomline Technologies
• Diebold Inc
• Envestnet Inc
• Fidelity National Information Services
• First Data Corp
• First Internet Bancorp
• Fiserv Inc
• Green Dot Corporation
• Heartland Payment Systems, Inc.
• Jack Henry & Associates, Inc.
• LendingClub Corp
• Lendingtree Inc
• Mitek Systems, Inc.
• Monitise Plc
• NCR Corporation
• NetSol Technologies Inc.
• On Deck Capital Inc
• Paypal Holdings Inc
• Q2 Holdings Inc
• Square Inc
• Temenos Group AG
• Top Image Systems Ltd.
• Total System Services, Inc.
• Vantiv Inc
• Virtual Piggy Inc
• Worldline SA