Clean Energy Fuels (NASDAQ:CLNE) reported fourth-quarter and full-year earnings after the bell yesterday, and shares are being punished in Friday trading. 

Motley Fool analyst Sara Hov explains that it's likely an overreaction. The year-ago quarter benefited from a one-time bump in top-line growth, so the most recent quarter was up against a tough comparison. Overall, revenue and volumes were positive, so Sara considers it a good quarter. Additionally, Clean Energy Fuels is pursuing major contracts both domestically and abroad.

Clean Energy Fuels has dramatically underperformed the broader market in the past year, but Sara believes the long-term bull thesis for the company remains intact.