U.S. Senate Committee on Finance Ranking Member Ron Wyden released oversight letters to Jefferies Financial Group, Oppenheimer & Co., and Stifel Financial Corp. seeking details on transactions in which investment banks purchased the rights to tariff refunds from small businesses, often at steep discounts. The inquiry focuses on whether businesses affected by tariffs invalidated by the Supreme Court were then pushed into opaque or disadvantageous deals while the Trump administration delayed refunds and imposed a new claims process. Wyden asked the firms to identify each refund-rights transaction they executed, brokered, or otherwise facilitated since November 5, 2025, including the seller, estimated refund amount, upfront cash paid, discount percentage, any clawback or other terms that could reduce proceeds, and the transaction date. He also requested solicitation materials and term sheets, disclosures about refund timing and administrative burdens, explanations of how pricing changed after the Supreme Court's February 20, 2026 decision, whether the firms have helped sellers prepare refund claims, strategic documents on targeting potential sellers, and any communications with U.S. Customs and Border Protection or other government agencies about refund mechanics. Responses were requested by May 21. The letters sit alongside Wyden's broader push for automatic tariff refunds, including legislation introduced in February 2026 and a March letter to CBP criticizing the refund system's burden on small businesses.