Tether's reserve buffer halves, and undisclosed comprehensive loss exceeds US$4 billion

Proof of reserves shows Tether's financial buffer has shrunk significantly

The latest proof of reserves released by Tether, the world's largest stablecoin issuer, shows that its financial buffer is shrinking, while lawmakers in Washington are discussing a regulatory framework for stablecoin. Excess reserves had reached a record high of US$8.23 billion as of the end of March, but had dropped sharply to US$4.11 billion by June 30, a drop of 50%. Halving this cushion weakens the protective layer on which many traders and protocols rely.

Tether's income statement looks healthy on the surface. The company reported net operating income of $1.5 billion in the second quarter. However, comprehensive financial results for the first six months of this year-a measure that includes unrealized gains and losses-were negative $3.17 billion. Combined with previously reported net income of approximately $1.04 billion for the first quarter, calculations show that the overall loss for the second quarter easily exceeded $4 billion. In addition to mentioning the existence of unrealized losses, Tether did not explain the specific reasons for this fluctuation, making the composition of these book losses still opaque.

Collateral portfolio under review

The sharp decline in excess reserves has brought the quality and liquidity of Tether's backing assets back into focus. Although the company has gradually shifted more reserves into U.S. Treasuries over the past two years, the exact structure of these positions-and their sensitivity to interest rate changes-remains unclear. As tokenized real-world assets on public chains recently exceeded US$20 billion, the stablecoin market requires more granular disclosures. Competitors like Circle have released detailed monthly breakdowns. In contrast, Tether's proof provides only high-level classification, allowing analysts to speculate whether a large chunk of unrealized losses will come from bond writedowns, private investments, or other completely different assets.

Excess reserves act as a buffer. $4.11 billion still looks substantial in absolute terms, but the speed of erosion is crucial. Further declines in market valuations, or massive redemptions, could test the remaining buffer faster than a year ago. USDT has a market value of more than $80 billion, so even a small loss of confidence can have a huge impact.

What numbers don't say

The second-quarter certification highlighted a familiar contradiction: Tether reported strong operating profit, while overall financial results were deeply negative. The division is not new-unrealized losses can be reversed-but the scale of the quarter is unusual. The company did not provide a breakdown of losses of more than $4 billion, nor did it say which assets caused the writedowns. Any entity issuing a quasi-systemic stablecoin that operates at such an opaque level will attract regulatory attention, especially if excess reserves are halved within a quarter.

Transparency advocates have long urged Tether to conduct a comprehensive audit. The latest data will sharpen these calls. The gap between reported profits and overall losses also poses practical problems for exchanges and institutional users who rely on USDT for settlement. If the reserve buffer continues to shrink, the need to diversify into other stablecoins or tokenized legal products may grow.

Regulatory headwinds

Reserve fluctuations come as U.S. lawmakers are finalizing legislation that will implement a federal regulatory framework for stablecoin issuers. Proposals circulating in the Senate include one-on-one reserve requirements, periodic certification, and in some cases comprehensive audits. For Tether, which is registered offshore, complying with any new U.S. regulations will require a significant increase in disclosure levels. The company's ability to withstand more than $4 billion in non-operating losses without unanchoring the hook suggests that its system remains solid, but regulators often focus on what is missing from disclosures rather than what is already displayed.

Market participants are unlikely to panic based on this data point alone. The USDT continues to trade close to its dollar peg and there has been no surge in redemptions. But the halving of excess reserves, coupled with the lack of detail on overall losses, shifted the discussion away from theoretical transparency to near-term risks. The next proof will receive closer attention.