Читайте.
как вариант -
= party to a commercial transaction

стр. 518
pdf

а судя по приведенной ссылке
“Sophisticated” parties, whether individuals or business entities, are presumed to have access to information, resources to allocate risk and experience or predisposition to counteract cognitive bias....

и еще
Courts also reference sophistication in determining
whether a party can avoid a contract on the grounds of mistake or
fraud

частично это отражает термин "информированный"

см.
Summary judgment in favor of these
Defendants is denied with respect to Plaintiff's negligent
failure to warn claims because no Defendant has identified
evidence that Plaintiff was a sophisticated user of the asbestos
insulation for which Plaintiff seeks to hold it liable

зд. например, речь об информированности о рисках продукта