Ken Griffin, the billionaire founder of Citadel who built his fortune in Chicago, is opening his checkbook wide again as the 2026 midterms creep closer. The hometown megadonor has started cutting seven-figure checks to Republican campaign groups, sending national strategists and Chicago political insiders scrambling to game out where that money will land this fall.
According to Crain's Chicago Business, which cites reporting in The Wall Street Journal, Griffin has sharply ramped up his giving to GOP-aligned outfits ahead of November. Crain's reports that the Journal cast Griffin's activity as part of a broader surge of cash from Republican megadonors this cycle.
Federal Election Commission records show Griffin gave $5 million on May 1 to the Congressional Leadership Fund, according to Bloomberg Law. That early check, logged in FEC filings, is listed as one of the first seven-figure placements tied directly to the 2026 midterm contests.
Griffin remains a towering presence in Chicago civic life even after moving Citadel's headquarters to Miami in 2022, and his philanthropy keeps his name on plenty of local buildings. His charitable footprint includes his $125 million museum gift to the Museum of Science and Industry, now bearing his name, and a recent profile in The New Yorker details how business clout plus philanthropy can translate into hard political influence.
What the money buys
Groups such as the Congressional Leadership Fund, described by Bloomberg Law as "the main super political action committee supporting Republican candidates for the House," use big early donations to lock in TV and digital ad reservations and to fund ground operations in swing districts. Axios notes that Griffin was one of the GOP's largest individual donors in 2024, and Republican operatives say his early bets this year could shift where party resources are concentrated on the map.
Chicago reaction
Back in Chicago, reaction to Griffin's political spending is decidedly split. Civic and business leaders often praise his cultural investments and philanthropy, while progressives and local activists question how much sway megadonors should have over national politics. That contrast between headline-grabbing charitable gifts and equally large political checks is a big reason his moves draw scrutiny both in Chicago and far beyond it.
As the calendar inches toward autumn, campaigns and watchdog groups on both sides are tracking where Griffin's money flows and how quickly it shows up as attack ads, glossy mailers, and field offices. Expect more oversized checks from Griffin and other heavy hitters as both parties fight for control of Congress in November.
