Tether published its latest quarterly attestation this morning, showing U.S. Treasury holdings against the USDT stablecoin float at a fresh record of $138.4 billion as of quarter-end, up from $124.6 billion three months earlier. By dollar value, the company's Treasury book is now larger than the sovereign holdings of multiple OECD members — a fact that has, somewhat improbably, become a routine line item in Washington policy briefings on stablecoin regulation and Treasury demand modeling. Total USDT float at the same date stood at $158 billion, leaving the reserve base modestly over-collateralized against the issued token supply.
The attestation, prepared by accounting firm BDO, breaks out roughly $122 billion of direct Treasury bill exposure, $11 billion in Treasury repo positions, and a smaller residual in money-market funds and overnight cash equivalents. Bitcoin, gold, and other assets account for less than 6% of the total reserve base. Average duration on the Treasury portfolio sits inside 90 days, consistent with the company's stated preference for short-dated paper that minimizes mark-to-market volatility against the dollar peg. Quarterly profits, derived almost entirely from net interest margin on the reserve book, exceeded $3.2 billion.
The growth has implications well beyond the company. Stablecoin issuers have collectively become a non-trivial buyer of short-duration U.S. government debt, with Tether and Circle alone now ranked alongside major money-market funds as marginal Treasury demand sources, and a long tail of smaller issuers adding incremental flow at the margin. Treasury auction data shows stablecoin-related entities absorbing a measurable share of bill issuance through 2025, and the Treasury Borrowing Advisory Committee has begun explicitly modeling stablecoin demand in its quarterly issuance projections — a status that effectively cements the category as part of the dollar-system plumbing rather than an outside curiosity.
Critics continue to argue that an attestation is not a full audit, and that quarterly snapshots leave room for short-term portfolio rotation between reporting dates that would not be visible in published data. Tether has consistently rejected the characterization, pointing to the seven consecutive quarters of clean attestations and to the fact that the company's bill holdings are custodied at major U.S. financial institutions whose own reporting can in principle be cross-referenced. The company has not committed to a full audit timeline, citing the absence of a Big Four firm willing to take on a digital-asset issuer of its scale, though it has indicated continued engagement with second-tier firms on a more granular reporting cadence.
Reaction within Washington has shifted noticeably in tone. Where earlier policy discussions treated Tether as a regulatory problem to be contained, the GENIUS Act framework signed earlier this year explicitly creates a federal pathway for foreign-issued stablecoins that meet reserve-quality and disclosure standards. Several Senate aides familiar with the legislation say Tether's growth — and the Treasury demand it generates — was a meaningful factor in the bill's framing. "The view became less about whether Tether should exist and more about how to bring it inside a clear regulatory perimeter without disrupting Treasury demand," said one staffer involved in the negotiations.
The broader implication is that stablecoin reserves are becoming a structural feature of dollar-system mechanics rather than a peripheral curiosity. Whether that integration deepens through 2026 will depend on three factors: the pace at which Tether obtains formal U.S. operating authorization under the new regime, whether Circle's USDC complex gains share at Tether's expense as banks deepen integrations, and whether any meaningful share of stablecoin-issuer Treasury exposure begins moving toward longer-duration paper as the regulatory framework matures. For now, the quarterly attestation reads as a status update on what has quietly become a $200 billion-plus segment of short-Treasury demand.