Someone’s Trian to buy Janus Henderson. Activist investor Nelson Peltz’s hedge fund company Trian Partners is seeking to buy up the 80% of outstanding shares of Janus Henderson that it doesn’t already control and take the asset manager private. Last week the company, along with venture capital firm General Catalyst, submitted an offer to pay a roughly 12% premium on the shares. It’s unclear if Janus Henderson will accept the offer, though the firm’s board assembled a committee to contemplate the proposal. ...