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Millions of dollars landed in the accounts of a “super PAC” backing Jeb Bush on the final few days of June, according to campaign reports released Friday by the Federal Election Commission, a last-minute deluge that allowed the group to beat its goal of raising $100 million in the first half of the year.

But one of the biggest checks came from a donor whose identity is a mystery: a limited liability company named Jasper Reserves, formed two years ago.

The firm was among the most generous donors to the Super PAC, Right to Rise, writing a $1 million check to the organization on June 29, according to the disclosures.

Million-Dollar Donors in the 2016 Presidential Race More than 80 individuals or corporations have given $1 million or more to presidential campaigns and the political organizations supporting the candidates.

But not much else could be ascertained about Jasper, such as the person or persons behind it, or what business and ideological interests they may have.

Under campaign finance rules, Super PACs are allowed to accept contributions from corporations. Most businesses are easily traceable to the owner or chief executive behind the donation. But depending on how they are structured, the corporations can be quite opaque, making it difficult or impossible for outsiders to determine the ultimate source of the money.

There were few few clues about Jasper Reserves, aside from an address of Capitol Street in Charleston, W.Va., which houses law offices, including the firm Bailey Glasser. The address is home to a variety of other limited liability corporations, according to West Virginia state records, many of which appear related to the state’s mining industry.

Lawyers from Bailey Glasser did not immediately return calls seeking comment, and a representative from Right to Rise said the group did not comment on its donors.