Template:Pgmsla nominee capsule
The reference (in the pledge version only) to a Nominee, may be to recognise that the 2018 Pledge GMSLA is typically suitable only for agency lending arrangements, in which the principal Lenders to the Loans will be wealth-management clients and funds whose assets are managed by an agent lender, who in turn has put the whole business in the hands of a triparty agent, who will manage the collateral flows, pledges and all that good oil.
Though why they didn’t say “tri-party agent”, it is hard to say, since “nominee” has, in other custody contexts, a rather different meaning. And there is nothing to stop folks using a tri-party arrangement with a normal 2010 GMSLA either, for that matter, and it has routinely been done for as long as anyone can remember.