March 11 (Reuters) - Janus Henderson ( JHG ) said on

Wednesday its board had determined that Victory Capital's ( VCTR )

proposal to buy the asset manager was not superior to

the take-private deal with Trian and General Catalyst.

San Antonio-based Victory had last month gone public with

its $8.6 billion offer for Janus Henderson ( JHG ), ratcheting up

pressure on the asset manager that previously agreed to a $7.4

billion buyout by Nelson Peltz's Trian and General Catalyst.

Janus Henderson ( JHG ) said Victory's latest proposal is not

actionable because it presents "significant closing risk and

uncertain value".