The INVESTMENT BANK that actually operates the books for and heads up an offering for an UNDERWRITING GROUP,and that is primarily responsible for ensuring the smooth trading of the issuer's securities during the crucial first days of trading.
The organizer of a syndicate. also called managing underwriter or syndicate manager. see also originator, pot, release letter.
The underwriter who, among other things, helps set the offering price and organises the other underwriters in selling a new issue.