SAN FRANCISCO — Five former Jawbone employees must hand over any confidential company information they kept after defecting to Fitbit Inc., a California judge ruled this week, finding Jawbone is likely to prevail in its breach-of-contract claim against the workers.

The employees likely breached their confidentiality agreements with Jawbone when they refused to allow the company to check their personal computers, servers and email accounts for trade secrets, San Francisco Superior Court Judge Harold Kahn ruled Tuesday.