European Banks Start to Make Provisions for US WhatsApp Fines

European banks are starting to count the cost of their employees’ messaging habits, which have caught the attention of US regulators in a sweeping global investigation.

Credit Suisse AG announced a $200 million charge in its earnings on Wednesday, saying it was in connection with a probe into business communications over unapproved electronic messaging channels.

Barclays Plc — one of the banks that hasn’t disclosed their involvement — is working with US regulators in relation to the investigation, according to people with knowledge of the matter. A spokesperson for Barclays, which is due to publish earnings on Thursday, declined to …