Mobileiron Inc (NASDAQ:MOBL) shares were down Thursday following preliminary results for its first quarter of 2015.

MobileIron warned that it would be missing its guidance for many categories in its first quarter earnings report. It expects non-GAAP revenue that ranges from $32.0 million to $33.0 million. This is below its guidance of $34.0 million to $37.0 million.

MobileIron also reported that it’s expecting gross billings for the first quarter of 2015 to be between $35.5 million and $37.0 million. This also falls below its guidance, which had gross billings for the quarter set to fall between $40.0 million $42.0 million.

MobileIron also reported that CFO Todd Ford is leaving the company. Ford is leaving MOBL to take on a role at another company. He’ll stay until the 10-Q filing, which will happen no later than May 4, 2015. The company is already looking for an interim CFO and will start the search for a permanent replacement in the near future.

MOBL shares were down 28% as of Thursday morning.

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