BB, MM, boutigue ?

couldnt post the link, but this is under the faq section.

Investment banks are categorized as a "bulge bracket" bank, regional bank or a boutique. Larger banks are considered to be bulge bracket banks and offer a full service approach to clients. The bulge bracket is comprised of nine top banks that include Bank of America, Merrill Lynch, Morgan Stanley, Citigroup, Deutsche Bank, UBS, Goldman Sachs, Credit Suisse, Barclays Capital and JP Morgan Chase.

Boutique banks vary in size from small one-man shops to large global enterprises. They typically specialize in an industry or specific product offering. Often times, a boutique is started by a banker interested in owning his own company. Some of the higher-profile boutiques include: Lazard, Evercore, Moelis, Jefferies & Co and Piper Jaffray.