Many workers use their personally owned smartphones and other computers for job tasks, but a new survey shows a big percentage are doing so without their employer’s knowledge.

Market research firm Gartner surveyed 4,300 U.S. consumers in June who work at large companies (with more than 1,000 employees) and found 40% used personally owned smartphones, tablets, laptops or desktops as a primary or supplemental business device.

That 40% might not be unusual, but more surprisingly, Gartner found that 45% of workers not required to use a personal device for work were doing so without their employer’s knowledge.

“Almost half [are using their device] without their employer’s awareness,” said Gartner analyst Amanda Sabia in an interview.

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