Late-Blooming Super PACs Funnel $637 Million Into Midterms Before Donors Surface

A wave of super PACs that materialized in the closing weeks of the 2026 midterms has pumped about $637 million into congressional races, according to a CNBC analysis of Federal Election Commission filings. The 22 groups each registered within the final 10 weeks before Election Day and each spent at least $1 million. Together they account for roughly one-sixth of all independent spending reported in House and Senate races this cycle.

Our Heritage Matters is the extreme case. It registered with the FEC on Oct. 15, started spending five days later to boost third-party candidates and hit Republicans, and by Oct. 29 had dropped about $1.2 million across 10 races. Because it formed after a key reporting deadline, voters won't see its donors until its first regular report lands Dec. 3 — a full month after Election Day.

The surge is unprecedented. At the same point in 2022, just five comparable groups had spent about $18 million combined, per CNBC's analysis. In 2018, three had spent about $12 million. Late-forming super PACs in 2020 and 2024 combined spent less than $50 million on congressional races — a total this cycle has already blown past. The number of million-dollar late-forming groups has more than quadrupled since 2022, and their spending has grown nearly 35-fold.

Speed is the whole point. Eighteen of the 22 groups began spending within 30 days of launching, and almost all opened their wallets before filing a regular report showing where the cash came from. They accounted for more than 22% of independent expenditures in congressional races during CNBC's 2026 window, up from less than 2% at the same stage in each of the previous two midterms. Republican-linked PACs spent about twice what Democrat-connected ones disbursed.

Michael Kang, a Northwestern Pritzker School of Law professor who studies campaign finance, told CNBC the motive is disclosure itself. 'The reason for this is almost entirely to avoid disclosure, even if just temporarily,' he said, adding that knowing the donors 'would undercut their cause.' Saurav Ghosh of the Campaign Legal Center put it blunter: 'They are a vehicle designed to emerge from nowhere and spend a bunch of money on an election' before voters learn who's funding it.

The biggest players hide in plain sight. No Going Back PAC formed Sept. 1, spent three days later and had burned roughly $187.8 million by the time its Oct. 20 report revealed MAGA Inc. had supplied $200 million; by Thursday it had spent about $242.2 million. Texas PAC, formed Aug. 28, spent about $181.6 million backing Republican Ken Paxton, with Elon Musk's $158 million in contributions to the Senate Leadership Fund only surfacing Oct. 12 — more than a month after spending began. Those two groups alone made up about two-thirds of the 22's total, and CNBC found organizational or financial ties linking nine of the 22 to established political networks.