The result of a ballot held by one of the UK's oldest advertising dining clubs is due to be formally announced at its annual meeting next Thursday.
However, Campaign understands that members have voted narrowly to keep the ban on women members.
But the reformers have gained one concession - women will be allowed to attend more Solus Club dinners than at present.
Mike Moran, the Thames Water marketing chief, who is the club's current president, and its president-elect, Douglas McArthur, the chief executive of the Radio Advertising Bureau, had been urging members to approve the change.
But the club's traditionalists insist they are not misogynists and argue that its WACL counterpart has never been put under pressure to admit men.