Memo to chief executives: beware of Goldman Sachs Asset Management, Deutsche Asset Management and T Rowe Price. The three giant fund managers are the most supportive of campaigns by activists, according to new analysis by data provider ProxyInsight.

In resolutions aimed at getting representatives from an activist investor onto a company board — a common tactic deployed by activists — Goldman and Deutsche supported at least one such candidate in more than half of the votes they cast. T Rowe Price supported dissident candidates 47% of the time and was also most likely to support the full slate of activist candidates.