Sex Trafficking Allegations Shake $134 Million UK Family Office

The investment firm for Hamish Ogston, one of Britain’s richest finance figures, is caught in the fallout from sexual-trafficking allegations against him.

Money manager Partners Capital has terminated its relationship with Ogston’s family office, known as Milton Magna, according to people with knowledge of the matter.

At least one Milton Magna executive has also cut ties, resigning from the firm after an investigation by the Sunday Times alleged the multimillionaire engaged in the exploitation of Southeast Asian sex workers for the past 15 years.

A representative for Ogston, 75, didn’t respond to a request for comment.

Ogston told the ...