Aside from the $1.74 Martin O'Malley made playing his guitar, Hillary Clinton is the only Democratic candidate for president who is getting money from Wall Street—and for her, it has come in droves.

Bernie Sanders has said that while he will stay true to his pledge not to directly attack Clinton, he will continue to point out her ties to the financial industry.

"I am surprised that Hillary Clinton does not understand why so many people have strong concerns about her receiving many, many hundreds of thousands of dollars from Goldman Sachs and from many other financial," Sanders said .

Clinton's long relationship with the financial sector has given Sanders a lot to point out, and she continues to give him new ammunition. Just this week, she was criticized for spending her time raising money at an investment bank rather than spending it talking to voters in Iowa.

Attending fundraisers hosted by finance executives has become standard practice for Clinton, who had already raised $5.9 million from the securities and investment industry leading into the most recent fundraising quarter.

Here is a list of 31 fundraising events that have been put on or will be put on for the Clinton campaign by the financial industry since she started campaigning early last year:

April 28, 2015 in New York, New York, hosted by Richard Perry. Perry is CEO and president of Perry Capital, a hedge fund worth roughly $11 billion.

April 28, 2015 in New York, New York, hosted by Doug Teitelbaum. Teitelbaum is the founder of Homewood Capital, a private equity investment firm.

May 13, 2015 in New York, New York, hosted by Steve Rattner. Rattner is chairman of Willett Advisors, the investment arm of billionaire Michael Bloomberg’s personal and philanthropic assets. He previously worked at Morgan Stanley and founded his own investment firm, the Quadrangle Group.

May 13, 2015 in New York, New York, hosted by Marc Lasry. Lasry is president and CEO of Avenue Capital Group, an investment firm that focuses on distressed assets and private equity.

May 28, 2015 in Atlanta, Georgia, hosted by A.J. Johnson. Johnson is a founding partner of Georgetown Capital, a private equity firm.

June 1, 2015 in New York, New York, hosted by Silda Wall. Wall is a principal at the New World Capital Group, a private equity firm.

June 5, 2015 in Greenwich, Connecticut, hosted by Malcolm Weiner. Weiner was chairman of investment management firms the Millburn Corporation and ShareInVest before he retired.

June 25, 2015 in New York, New York, hosted by Karen Persichilli Keogh and Eric Giola. Both Keogh and Giola are executives at JP Morgan Chase.

June 25, 2015 in New York, New York, hosted by Blair Effron. Blair Effron founded Centerview Partners, an investment banking firm.

June 29, 2015 in New York, New York, hosted by Martin Sosnoff. Sosnoff is CEO of Atalanta Sosnoff, a financial management firm.

July 1, 2015 in Washington, D.C., hosted by Patrick Steel. Steel is managing director of FBR Capital Markets, a Virginia-based investment bank.

July 21, 2015 in Chicago, Illinois, hosted by Rajiv Fernando. Fernando founded Chopper Trading, a high-frequency stock-trading firm.

July 22, 2015 in Raleigh, North Carolina, hosted by George Reddin. Reddin is managing director of FMI Capital Advisors, an investment banking firm.

August 4, 2015 in Aspen, Colorado, hosted by Robert Hurst. Hurst is a managing director at Crestview Partners and a former vice chairman at Goldman Sachs.

September 17, 2015 in Chicago, Illinois, hosted by J.B. Pritzker. Pritzker is an heir to the Hyatt fortune and runs The Pritzker Group, a private equity and venture capital firm.

September 19, 2015 in Washington, D.C., hosted by Frank White. White is founder and CEO of DuSable Capital Management, a private equity firm.

September 24, 2015 in Cresskill, New Jersey, hosted by Michael Kempner. Kempner was an operating adviser of Pegasus Capital Advisors, a private equity firm.

September 25, 2015 in Greenwich, Connecticut, hosted by Cliff and Debbie Robbins. Robbins is CEO of Blue Harbor Group, a capital management firm.

September 28, 2015 in Saratoga, California, hosted by Harry Plant. Plant was an executive director at UBS investment bank.

November 11, 2015 in New York, New York, hosted by Howard Lutnick. Lutnick is chairman and CEO of Cantor Fitzgerald, an investment bank.

November 17, 2015 in New York, New York, hosted by Jay Snyder. Snyder is president of HBJ Investments, a private equity and venture capital firm that specializes in pharmaceutical companies.

November 30, 2015 in Chevy Chase, Maryland, hosted by Jerry Johnson. Johnson is a founder of RLJ Equity Partners, a private equity firm. He previously served in senior investment banking roles at Bank of America, Wachovia, and Bear Stearns.

December 1, 2015 in Miami Beach, Florida, hosted by Bob Wagner. Wagner is an executive at Silver Point Capital, a hedge fund management firm. He was previously a managing director at Goldman Sachs.

December 3, 2015 in Los Angeles, California, hosted by Michael Kong. Kong is CEO of MAPTI Ventures, a private investment fund.

December 6, 2015 in Washington, D.C., hosted by Julius Genachowski. Genachowski is managing director of Carlyle Investments, a wealth management company with over $193 billion in assets. He is also on the board of MasterCard and the founder of Rock Creek Ventures, a principal investment firm.

December 11, 2015 in Chicago, Illinois, hosted by Howard Gottleib. Gottlieb is a partner at Glen Eagle Partners and Glenwood Partners, both private investment firms.

December 14, 2015 in Potomac, Maryland, hosted by Frank Islam. Islam is founder and chairman of FI Investment Group, a private investment firm.

January 27, 2016 in Philadelphia, Pennsylvania, hosted by Michael Forman. Forman is chairman and CEO of Franklin Square Capital Partners.

January 27, 2016 in New York, New York, hosted by Charles Myers. Myers is a top executive at Evercore Partners, an investment banking firm.

February 5, 2016 in Boston, Massachusetts, hosted by Jonathan Lavine. Lavine is a managing director of Bain Capital’s private equity sector. He is also founder and managing partner at Sankaty Advisors.

February 16, 2016 in New York, New York, hosed by Matt Mallow. Mallow is senior managing director of BlackRock, an asset management firm with control of $4.5 trillion.