Is sale and trading fragment of an investment ridge?
Answers:
yes.
Investment bank typically own a few divisions...
Corporate nouns (M&A, Equity / Debt Capital Markets, advisory for corporate clients)
Sales and Trading (to support asset management)
Equity Research (covers corporate clients, offer recommendation to asset running cleints)
Asset Management (helps populace near their $)
next you could throw contained by the proprietary trading groups - which don't really fall over lower than sale & trading because it's the firm's own means
Surely no...