Then there is not any should use whom in the slightest degree (as well as great vast majority of people Never). Will you be interested in how people used to do it? Use 'whom whenever it is a immediate or oblique item (like after a preposition like 'to'). . https://financefeeds.com/derivatives-executives-remain-bullish-despite-april-turmoil-sgx-q2-survey-finds/