A trust called DE First Holdings was quietly formed in Delaware. A day later, the entity dropped $1 million into a super PAC. The trust, whose owner remains unknown, is part of a growing cadre of mystery outfits financing big-money super PACs. Many were formed just days or weeks before making six- or seven-figure contributions - an arrangement that ... violates a long-standing federal ban on straw donors. But the individuals behind the ghost corporations" appear to face little risk of reprisal from [the] Federal Election Commission. The 2016 campaign has already seen the highest rate of corporate donations since the Supreme Court unleashed such spending with its 2010 Citizens United v. FEC decision. One out of every eight dollars collected by super PACs this election cycle have come from corporate coffers, including millions flowing from opaque and hard-to-trace entities. Such groups, which can accept unlimited donations ... are on track to far exceed the $86 million they gave to super PACs in the entire 2012 presidential cycle. A significant share of the money is coming from newly formed LLCs. Several campaign finance watchdog groups have filed complaints with the FEC against the recent pop-up LLCs, but the chances of the agency's looking into the cases appear slim. Last month, the agency closed a nearly five-year-old complaint about a limited liability company allegedly used to mask a donor's identity - unable to even agree whether it merited investigation.