Among the Americans exposed in the data leak are a Hollywood mogul, a Hyatt hotel heiress, a descendant of the family who created Campbell Soup and a former Republican fundraiser.

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WASHINGTON — The massive Panama Papers leak has put the American rich on notice. If you have an offshore, you’d better make sure the IRS knows.

The breach of Mossack Fonseca documents might have the mega-rich rethinking their use of offshores, even though many rely on such companies for all sorts of legal purposes, tax experts said.

Among the Americans exposed in the data leak are a Hollywood mogul, a Hyatt hotel heiress, a descendant of the family who created Campbell Soup and a former Republican fundraiser.

The revelations, which emerged from the little-known but powerful Panamanian law firm Mossack Fonseca, caused Iceland’s leader to step aside for an “unspecified” period and shook other foreign governments. Prominent U.S. politicians are not in the data, but some wealthy Americans are.

Investment banker Jerry Slusser, a fundraiser for former Republican presidential candidate Mitt Romney, initially said he didn’t recall setting up an offshore company. But when given details of his offshore from the leak of Mossack Fonseca documents, he remembered opening it in the British Virgin Islands. He then called his accountant.

“There’s nothing nefarious about it,” he said hours later. “This was for an investment in a manufacturing company in Hong Kong. I am very comfortable we have filed everything we need to file.”

He declined to provide details about his compliance with U.S. tax laws on what he described as a money-losing investment. He said it was a “private matter” before hanging up.

More than 11.5 million emails, financial spreadsheets, client records, passports and corporate registries were obtained in the leak, which was delivered to the Sueddeutsche Zeitung newspaper in Munich, Germany. In turn, the newspaper shared the data with the Washington-based International Consortium of Investigative Journalists.

“I would assume a lot of the ultra-rich are having conversations with their tax lawyers about what their exposure is as a result of this leak,” said Richard Pomp, a tax expert and law professor at the University of Connecticut. “They know their names are likely to be revealed to the IRS. The question is ‘How clean are we?’”

Determining a precise number of Americans in the data is difficult. There are at least 200 scanned individual U.S. passports. There are about 3,500 shareholders of offshore companies who list U.S. addresses. And almost 3,100 companies are tied to offshore professionals based in Miami, New York and other parts of the United States.

When used legally, offshore accounts can reduce a person or a company’s tax bill. A company, for example, might route its revenue from multiple countries to one low-tax base. Critics argue that while that’s not illegal, companies and people should not be allowed to do so, but instead pay taxes where they earn their money.

Because offshore accounts can obscure the identity of the owner, they are often used illegally to hide money from the taxman or launder ill-gotten gains.

One of the more prominent American names in the data is Sanford Weill, 83, who was the powerful CEO and later chairman of Citigroup from 1998 to 2006. As the Brooklyn-born son of Polish immigrants, Weill rose from humble roots to arguably the highest perch of American finance.

Weill appears as a shareholder in two companies: April Fool Ltd. and Brightao Corp. He’s the sole shareholder in April Fool, a shell company in the British Virgin Islands. An associate of Weill’s who declined to be identified confirmed the offshore is linked to a 200-foot yacht by the same name.

CNBC reported in 2013 that Dan Loeb, founder of New York-based hedge fund Third Point, purchased the yacht for more than $50 million.

Weill has said he named the boat for the date he met his wife, Joan Mosher, whom he married in 1955. Weill, a major philanthropist, is largely retired from high finance but remains president of the board of trustees of Carnegie Hall in New York.

April Fool was located in the British Virgin Islands and was active from 2001 to 2005.

The other offshore company tied to Weill is Brightao, which includes a number of prominent U.S. investors and Chinese businessmen. That offshore company in the British Virgin Islands was used as a vehicle through which investors held shares in a Chinese insurance and risk-management firm called Mingya Insurance Brokers, confirmed the associate of Weill.

Hollywood music and film mogul David Geffen also appears in the documents. He’s director of a Delaware company called Barham Maritime, which in 2011 sold shares of his Cayman Islands company created to hold title to his yacht called Pelorus. shows the yacht Pelorus is anchored in Miami.

The sale price for the yacht was $214 million, and it was sold to a Panama offshore company called Marfleet Limited. Mossack Fonseca lawyers reviewed the sale documents.

The documents show that Royal Group Companies Management was the true buyer of the yacht. A website describes the company, in the United Arab Emirates, as active in real estate, tourism and international trade and development. Its chairman is Tahnoun vin Mohammed Al Nahyan, who is also a shareholder of Marfleet and is the UAE’s royal family representative for the Eastern Region.

Forbes says Geffen has a net worth of $6.8 billion. He is the co-founder of DreamWorks Animation SKG.

Geffen’s lawyer, Bertram Fields, said Geffen has “never used an offshore account for business or commercial purposes or has any kind of tax haven.”

Liesel Pritzker Simmons also appears in the Panama Papers. She’s a former child Hollywood star and heiress to the Hyatt hotels fortune. She’s also related to U.S. Commerce Secretary Penny Pritzker. Forbes magazine estimated her net worth at $600 million in late 2013, and her wealth is combined with that of husband Ian Simmons, himself an heir to a construction and retailing fortune.

In the Panama Papers, the two appear as shareholders of a Panamanian shell company called Blue Valley Agroinvestment. The documents suggest investment in Colombia’s palm-oil sector. One of the other shareholders is John Thompson Dorrance IV, a descendant of the family that created the Campbell Soup company.

In a March 2013 email between lawyers in Medellín, Colombia, one notifies the other that Dorrance wants his name replaced with “the name of one of his companies in the Bahamas, LOUP Holdings.” Dorrance did not respond to requests for comment.

In a statement, Pritzker Simmons confirmed her stake in the company.

“My husband, Ian Simmons, and I are minority investors in Blue Valley Agroinvestment, a sustainable agriculture project in Colombia,” she said. “Any income we earn is fully taxed. We are proud of the job creation and community development this project brings to an underserved part of Colombia.”

Other famous names showing up on the Mossack Fonseca list:

• Formula One driver Nico Rosberg, whose lawyer said an offshore firm linked to him was created solely for liability reasons and to enable him to operate internationally. German public broadcaster NDR reported that Mossack Fonseca set up a company called Ambitious Group that has a contract with Mercedes for Rosberg’s “driver services.” Rosberg’s lawyer, Christian Schertz, said Ambitious Group, which is registered in the British Virgin Islands, wasn’t used for tax avoidance. Rosberg, who won Sunday’s Bahrain Grand Prix, is registered in Monaco for tax purposes and receives all payments there, he said.

• Spanish director Pedro Almodóvar was reported to have canceled publicity events for his new movie “Julieta” because of intense interest in the offshore company he owned with his brother years ago. The Europa Press news agency said Almodóvar canceled an appearance at a photo shoot and interviews before the movie’s premiere in Madrid on Wednesday night.

The leaked data also showed a fondness for naming shell companies after James Bond films. Mossack Fonseca reportedly incorporated companies named Goldfinger, SkyFall, GoldenEye and Moonraker and was asked to set up a firm called Octopussy.

The Organized Crime and Corruption Reporting Project, one of the media companies with access to the leaks, said the law firm also incorporated companies named Blofeld and Spectre, after the classic Bond villain and his organization.