Clean Energy Fuels Corp. (CLNE) saw its stock tumble 5.54% in the after-hours trading session on Monday, following the release of its mixed fourth-quarter results.

The company reported adjusted EBITDA of $23.61 million for Q4, beating analysts' estimates of $19.3 million. However, it posted a net loss of $30.159 million, or $0.15 per share, wider than expectations. Revenue of $109.3 million surpassed the consensus estimate of $102.6 million.

While Clean Energy Fuels' top-line growth and profitability on an adjusted EBITDA basis were encouraging, the wider-than-expected net loss seemed to weigh on investor sentiment. The company's guidance and outlook for the upcoming quarters will likely provide further clarity on the stock's direction.