Sandler O'Neill and Partners
| Company type | Partnership |
|---|---|
| Industry | Investment banking |
| Founded | 1988 |
| Defunct | 2019 |
| Fate | Acquired by Piper Jaffray, now Piper Sandler Companies |
| Headquarters | 1251 Avenue of the Americas, New York, New York, US |
Key people | James J. Dunne III, Senior Managing Principal Jonathan J. Doyle, Senior Managing Principal |
| Website | www |
Sandler O'Neill + Partners, L.P. (commonly known as Sandler O'Neill) operated as a comprehensive investment banking firm and broker-dealer with a dedicated focus on the financial services industry. Its main headquarters were located in New York City, complemented by additional branches in Boston, Chicago, San Francisco, and Atlanta. The firm also maintained a mortgage finance affiliate and a registered investment adviser based out of Memphis, Tennessee.
Overview
The firm concentrated on delivering investment banking solutions tailored to financial institutions and their investors. Its service offerings encompassed advisory for mergers and acquisitions, capital markets transactions, fixed income and equity sales and trading, equity research, balance sheet optimization, mortgage finance services, and strategic consulting. Sandler O'Neill produced research coverage on nearly 300 financial institutions across the United States.
Maintaining its status as a private partnership throughout various industry changes, Sandler O’Neill stood as the largest privately held investment bank devoted solely to the financial sector. It regularly secured top rankings among advisors for bank and thrift merger deals as well as capital raising efforts.
In 2019, the firm was acquired by Piper Jaffray in a $485 million transaction and subsequently rebranded under the name Piper Sandler Companies. The combined organization is based in Minneapolis.
History
Established in 1988 by Herman S. Sandler, Thomas O’Neill, along with four former executives from Bear Stearns, Sandler O'Neill + Partners initially targeted community and mid-sized banks—a market segment that was largely underserved at the time. Shortly after its founding, Christopher Quackenbush joined from Merrill Lynch to spearhead the development of the firm's investment banking capabilities.
The creation of Sandler O'Neill Mortgage Finance occurred in 1990 as an affiliated entity headquartered in Memphis with a separate office in New York City distinct from the main firm’s location.
By 1993, the company moved its operations to Two World Trade Center and expanded by launching an equity sales and trading division alongside equity research focused on community banks and other financial institutions.
Growth continued with the opening of satellite offices: Boston in 1998; Atlanta and San Francisco in 2003; followed by Chicago in 2004.
As a premier investment bank specializing exclusively in financial institutions, Sandler O’Neill played a significant role advising on mergers, acquisitions, and capital raising transactions. It distinguished itself as one of the few remaining privately owned Wall Street investment banks after many peers—including Goldman Sachs—had transitioned to public ownership. In 2010, it sold a substantial minority interest to private equity investors Carlyle Group and Kelso & Company.
Leadership included co-founder James J. Dunne III along with senior managing principal Jonathan Doyle. The firm celebrated its 25th anniversary milestone in 2013.
The acquisition by Piper Jaffray in 2019 resulted in the formation of Piper Sandler Companies.
September 11 attacks
On September 11, 2001, the company, whose offices were situated on the 104th floor of the South Tower, suffered the loss of 68 out of its 171 employees—approximately 40% of its staff—including one-third of its partners, nearly all personnel from the equity and syndicate teams, as well as every bond trader. Among those who perished were top executives Herman Sandler and Christopher Quackenbush. Equities trader Welles Crowther, famously remembered as "The Man in the Red Bandana," also lost his life. The firm’s computer infrastructure and the majority of its records were obliterated.
By September 12, Sandler O'Neill had recommenced operations and publicly declared on September 19 that it was fully operational. Initially, the company functioned out of office space provided by Bank of America in the Solow Building, before moving in early 2002 to 919 Third Avenue, where it remained until 2012. This swift revival highlighted the firm’s resilience and effective leadership during a crisis, ensuring continuity of client service and maintaining its position in the market.