Stocks making the biggest moves after hours: Box, Coupa and more

Check out the companies making headlines after the bell:

Shares of Box dropped nearly 11% in extended trading after the cloud company lowered guidance for the current fiscal year. Box now expected full-year revenue between $688 million and $692 million, down from a previously stated range of $700 million to $704 million. The company reported a first-quarter loss of 3 cents per share and revenue of $163 million, topping Wall Street estimates of a loss of 5 cents per share and revenue of $161.4 million.

Coupa Software stock jumped more than 4% after the company posted a surprise profit and reported first-quarter results that beat analysts expectations on the top and bottom lines. Coupa reported earnings of 3 cents per share on revenue of $81.3 million, while analysts had expected a loss of 4 cents per share on revenue of $73.9 million.

Shares of Continental Resources jumped nearly 3.5% after the petroleum and natural gas company announced a $1 billion share-repurchase program.

Shares of real estate investment trust Ventas fell 2% after announcing a secondary offering of 11 million shares. The company intends to use the proceeds to help fund an acquisition. Morgan Stanley, Citigroup and J.P. Morgan are joint book-running managers for the offering.