March 22 (Reuters) - U.S. cloud services provide Box Inc is exploring a sale amid pressure from hedge fund Starboard Value LP over its stock performance, according to people familiar with the matter. Redwood City, California-based Box has discussed a potential deal with interested buyers, including other companies and private equity firms, the sources said, cautioning that no sale of the company is certain. The sources requested anonymity because the matter is confidential. Box declined to comment. Reuters reported last month that Starboard was preparing to launch a board challenge against Box unless it took steps to boost value for shareholders. It has privately expressed disappointment that the company has failed to capitalize on the work-from-home trend during the COVID-19 pandemic, as many of its cloud computing peers have done. Its shares currently trade at around $22 apiece, only marginally higher than the price at which it debuted on the New York Stock Exchange in January 2016. Box said last week it would extend the deadline to nominate directors to its board from mid-April to May 11. Founded in 2005, Box’s offering includes file sharing, cloud storage and cloud backup. Demand for secure file-sharing and other workplace collaboration services has risen since the onset of COVID-19, driven by the information technology needs of companies whose employees are working from home. While Box has benefited from this trend, it has struggled to fully capitalize on it, as some of its services and products are offered by competitors either for free or at a lower cost. Box earlier this month reported fourth-quarter earnings that beat analyst expectations. The company has a market capitalization of around $3.6 billion. (Reporting by Greg Roumeliotis in New York and Joshua Franklin in Boston Editing by Nick Zieminski)