If the new Trump era has a theme, it’s one of quixotic disruption with random consequences. In that spirit, stand by for more interventions from activist shareholders seeking to electrify sluggish businesses while making fast bucks on the way through.

The first episode over here was the attack by the New York investor Boaz Weinstein on seven London-listed investment trusts, in which he acquired stakes and forced shareholder votes to replace board members, with the aim of taking the trusts’ assets under the management of his own firm, Saba Capital.