POLITICO analysis finds more than $48 million spent by undisclosed super PACs in 2026 House and Senate primaries

More than $48 million has been spent on 2026 House and Senate primaries by super PACs that have not yet revealed their donors, according to a POLITICO analysis published June 14. The spending, focused on primary contests, reflects a growing role for independent spending committees that can operate without disclosing funding sources immediately, depending on reporting timing and how committees structure their receipts and disbursements.

The analysis centers on super PAC activity in federal primaries for both the House and the Senate. While campaigns and traditional political action committees must report donors under federal campaign finance rules, super PACs can purchase ads and other election-related communications independently, and the public record may not show donor identities in a single, immediate snapshot of committee finances.

Under the disclosure system used for federal elections, super PACs file periodic reports with the Federal Election Commission. Those filings can include information about receipts and disbursements, but the pace and completeness of publicly available donor information can vary by committee, filing schedule, and the specific categories of transactions reported. As a result, POLITICO reported that, at least at the time of its review, certain committees had not yet made donor information public.

The reported scale of independent spending in primaries matters because primaries are often decided earlier than general elections and can determine who ultimately appears on the November ballot. When outside groups spend heavily in primaries, they can raise the overall cost of nomination contests for candidates and increase the volume of political advertising and other outreach that primary voters encounter.

Independent spending in primaries can also affect how oversight and enforcement resources are allocated. Federal election administration relies heavily on timely reporting, audit trails, and follow-up when disclosures or reported activity appear incomplete or inconsistent. When donor identities are not yet public, the public record can be less transparent for voters attempting to track who is funding political messaging.

The dynamics also raise legal and constitutional questions that have long been associated with super PAC activity, including the balance between donor disclosure requirements and the First Amendment protections recognized for independent political expenditures. While disclosure and reporting frameworks exist, the degree to which donor identities are visible in real time can differ from how quickly expenditures occur in fast-moving primary contests.

For candidates, parties, and election administrators, the next step is largely tied to reporting. As super PACs file subsequent FEC reports, additional details about receipts and donor categories may become publicly available. Whether the identities behind the reported spending appear in later filings will determine how fully voters can map the financial backers of the messaging that appears during primary races.