Boutique investment banks specialize in some particular aspects of investment banking. Following list shows the largest global boutique investment banks.

Blackstone Group L.P. – A premier global boutique investment and advisory firm with over 2,100 employees in 20 offices worldwide. The company is the world's largest independent alternative asset manager with total assets under management of about $400 billion (January 2018).

Brown Brothers Harriman (BBH) is the leading global asset servicing provider with assets under custody and administration of over $4.7 trillion.

Centerview Partners – Independent investment banking and advisory firm. It was founded in 2006 and is headquartered in New York with offices in London, Los Angeles and San Francisco.

Cowen Group, Inc. provides alternative investment management, investment banking and other services through Ramius LLC and Cowen and Company, LLC. As of December 2017, the Group had assets under management of over $10 billion.

C.W. Downer & Co. is an independent global investment bank offering middle market M&A advisory services. The company was established in 1975 and is based in Boston, USA.

Duff & Phelps – A leading global financial advisory and investment banking firm with offices in North America, Europe and Asia.

Evercore Partners is a boutique advisory investment bank with more than $2 trillion in announced transactions and $9 billion in assets under management.

Greenhill & Co. – A leading boutique investment bank with offices in New York, San Francisco, London, Frankfurt, Stockholm, Sydney, Tokyo, Toronto, Chicago, Houston, Melbourne, Sao Paulo and Singapore.

Guggenheim Partners – A global financial services firm with 2,500 professionals in nine countries and over $295 billion in assets under management (September 2017). It provides investment banking, capital markets services, investment advisory solutions and other services.

Houlihan Lokey, Inc. – An independent, advisory-focused global investment bank. It is No.1 M&A Advisor for U.S. and No.1 Global Investment Banking Restructuring Advisor.

Investec – An international specialist bank and asset manager operating in the United Kingdom, South Africa, Australia and Europe. The company focuses on three core areas: Asset Management, Wealth & Investment and Specialist Banking. Investec has approx. £90 billion in total funds under management.

Jefferies LLC – A major global securities and investment banking firm headquartered in New York, United States.

Lazard Ltd – A leading financial advisory and asset management firm with offices in 27 countries. As of September 30, 2017, Lazard had assets under management (total AUM) of US$238 billion.

Lincoln International – An independent global investment bank with headquarters in Chicago, Illinois. It operates 16 offices in 14 countries in the Americas, Asia and Europe. The firm specializes in advisory services including sell-side M&A, buy-side M&A, debt advisory, growth equity, special situations, valuations and opinions, and pensions advisory.

Moelis & Company – A global investment bank based in New York, United States. As of August 3, 2017, it had a market capitalization of $2.7 billion.

Mediobanca – The leading Italian investment bank with branches in New York, Paris, Frankfurt, Istanbul, London, Madrid, Mexico City and Moscow.

N M Rothschild & Sons Ltd – A multinational investment banking company headquartered in London, the UK.

Oppenheimer & Co. – A leading investment bank and full-service investment firm. It operates as a subsidiary of Oppenheimer Holdings Inc, which hold client assets under administration of $80 billion.

Perella Weinberg Partners L.P. – A boutique investment banking firm with offices in New York, Denver, Austin, San Francisco, London, and Abu Dhabi. It provides advisory and asset management services to corporations, institutions and governments.

Piper Jaffray & Co. – A boutique investment banking and asset management firm with offices across the United States and in London, Hong Kong and Zurich.

Probitas Partners, L.P. – An independent global investment bank headquartered in San Francisco, USA, with additional offices in New York, Hong Kong and London.

Robert W. Baird & Co. – One of the largest full-service investment firms in the US with more than 100 offices around the globe. The company manages over $165 billion in client assets.

Sandler O'Neill Partners – A boutique investment bank established in 1988. It is headquartered in New York with offices in Boston, Chicago, San Francisco and Atlanta.

William Blair & Company – An independent and employee-owned global investment banking and wealth management firm with approximately $74 billion in assets under management (09/30/2017).

The Large and mid-sized Boutique Investment Banks

Allen & Company – A boutique investment bank headquartered in New York.

Alvarez & Marsal (A&M) – The consulting firm known for its turnaround and restructuring related practices.

Arma Partners – Located in London, the UK, the company provides corporate finance advisory services to CMT sector.

Berkery, Noyes & Co – A boutique investment banking firm providing debt and equity financing, M&A advisory and financial consulting services to companies in the middle-market.

BG Capital – With more than 20 years of experience, the firm provides mergers and acquisition advisory services for small and mid-cap clients.

BTG Pactual – The largest independent investment bank in Latin America.

Cain Brothers (medical services and medical technology industries)

Cantor Fitzgerald (capital markets investment bank)

Capstone Partners (independent middle market investment bank)

China International Capital Corp – One of China's largest investment banking companies.

CLSA Asia-Pacific Markets – Asia’s leading independent brokerage and investment group.

CSG Partners

Cantor Fitzgerald

Genesis Capital, LLC

CITIC Securities Company – A full-service investment bank in China.

Gleacher & Co.

Close Brothers Group

Cogent Partners

Guggenheim Partners

Corporate Finance Associates

Guosen Securities – A leading Investment Bank in China.

Daewoo Securities – The largest stock brokerage and investment banking firm by market cap in Korea.

Defoe Fournier & Cie, founded in 1824, was an independent boutique investment firm. In 2016, Defoe Redmount acquired a large part of Defoe Fournier.

Edgeview Partners, L.P. – An investment banking firm serving middle-market clients.

Europa Partners Ltd – A boutique investment bank working with companies of all sizes. It was founded by Paul Zisman in 2000.

Financo, Inc. – A New York-based boutique investment bank.

Foros Group LLC, founded in 2009 by Jean Manas, is a boutique investment banking firm headquartered in New York.

FBR & Co (Friedman Billings Ramsey) was formerly known as FBR Capital Markets Corporation.

High Rock Partners – A boutique firm offering strategic and M&A advisory services, serving leaders of emerging growth and middle market companies.

Harris Williams & Co. – An investment bank specializing in advisory services for middle-market companies.

Imperial Capital, LLC

Keefe, Bruyette & Woods (KBW)

Ladenburg Thalmann

Lancaster Pollard

Marathon Capital

Marlin & Associates

McColl Partners

Miller Buckfire & Co. was acquired by Stifel Financial.

Montgomery & Co.

Morgan Keegan & Company was acquired by Raymond James Financial, Inc in 2012.

M. M. Warburg & Co. – A large German private investment bank.

Needham & Company, LLC

Pegasus Intellectual Capital Solutions LLC – A leading boutique investment bank engaged exclusively in corporate finance and specializes in crafting custom engineered solutions. Pegasus was named “2013 Investment Banking Boutique of the Year” by Acquisitions Finance Magazine.

Panmure Gordon & Co (PG&Co) – A British investment banking and institutional stockbroking firm.

Peter J. Solomon Company

Park Lane (sports finance advisory services)

Pottinger (Australia) – A leading independent financial and strategic advisory firm.

Roth Capital Partners

Raymond James Financial

Sagent Advisors

Sonenshine Partners

Sucsy, Fischer & Company

Stephens, Inc.

Stifel Financial

Stone Key Partners

Thomas Weisel Partners was acquired by Stifel Financial.

Vermilion Partners – An investment banking advisory firm based in China.

Wedbush Securities

WR Hambrecht & Co.

Top 10 Boutique Investment Banks

Blackstone

Brown Brothers Harriman

Lazard Ltd

Moelis & Co

Rothschild

Centerview Partners

Guggenheim Partners

Greenhill & Co

Houlihan Lokey, Inc

Jefferies LLC

Perella Weinberg Partners