Circle crashes 19% as Tether audit narrows stablecoin credibility gap
First-ever Big Four audit of USDT reserves threatens USDC's perceived regulatory edge amid CLARITY Act pressure
Circle shares plummeted 19.3% on Tuesday to $102.14, marking the stock's worst single-day decline on record, after rival stablecoin issuer Tether announced it had engaged a Big Four accounting firm for its first-ever full audit of USDT reserves. The move threatens to erode Circle's perceived regulatory advantage with its USDC stablecoin, which has long been viewed as the more transparent and compliant option in the market.
Tether's agreement with an undisclosed Big Four auditor, initially revealed in March 2025, aims to complete a comprehensive financial statement audit by the end of 2026. The audit will scrutinize Tether's complex asset portfolio—including digital assets, U.S. Treasury bills, and tokenized government bonds—in a manner typically reserved for the world's largest financial institutions. Previously, Tether had only provided quarterly reserve attestations conducted by BDO, raising questions about the full backing of its $95 billion USDT stablecoin.
"This is the biggest credibility shift in the stablecoin industry," said one cryptocurrency analyst who requested anonymity. "For years, USDC's competitive moat was transparency. If Tether completes a Big Four audit, that moat effectively evaporates."
The selloff erased approximately $7.6 billion from Circle's market capitalization, which now stands at $33.5 billion. The stock has fallen 66% from its 52-week high of $298.99 reached last year, reflecting growing concerns about the company's competitive position in an increasingly crowded stablecoin market.
Compounding the pressure from Tether's audit announcement are mounting regulatory concerns in Washington. Revisions to the Digital Asset Market Clarity Act (CLARITY Act), unveiled earlier this month by Senators Angela Alsobrooks and Thom Tillis, would prohibit passive yield on stablecoins—meaning holders could no longer earn returns simply by holding dollar-pegged tokens.
The proposed restrictions emerged after intense lobbying from traditional banks, which warned that stablecoin rewards resembling bank deposits could trigger deposit flight of up to $6.6 trillion. The revised legislation would allow only activity-based rewards tied to payments, transfers, or platform usage, though specific mechanisms remain undefined and have drawn criticism from the cryptocurrency industry for being too narrow.
"A ban on passive yield would require Circle to fundamentally rethink its business model," noted analysts at one investment bank. "Yield programs have been a key differentiator for USDC adoption. Losing that capability while simultaneously facing heightened competition from Tether creates a challenging two-front war."
Circle, which reported revenue of $2.75 billion over the trailing 12 months and is not yet profitable, has positioned itself as the compliant alternative to offshore stablecoin issuers. The company's USDC is subject to New York state regulation through its relationship with issuer Circle Internet Financial, while Tether operates largely outside the U.S. regulatory perimeter.
Despite Tuesday's dramatic decline, analysts remain divided on Circle's prospects. Of the 23 analysts covering the stock, 11 rate it a buy or strong buy with an average target price of $127.31—roughly 25% above Tuesday's close—while 11 maintain a hold rating and one recommends selling. The forward price-to-earnings ratio stands at 120.48, reflecting investor expectations of future profitability.
The CLARITY Act, which passed the House in July 2025 and cleared the Senate Agriculture Committee, faces several legislative hurdles before becoming law. A Senate Banking Committee markup is targeted for the second half of April, followed by a full Senate vote and reconciliation with the House-passed version. Even if enacted, enforcement of the yield restrictions is not expected until late 2026 or early 2027, as regulators work toward finalizing implementation rules.
Circle executives have been advocating for European regulators to fast-track digital asset framework reforms, warning that delays on stablecoin settlement and tokenized markets could cede ground to the United States. Earlier on Tuesday, the company announced its debut Africa deal with Nvidia-backed Cassava Technologies, signaling efforts to expand into emerging markets where digital payment adoption is accelerating.
Tether's pursuit of a Big Four audit represents a significant credibility play for the controversial stablecoin issuer. The company, which reported $10 billion in profits for 2025 and holds $141 billion in U.S. Treasury securities, has historically faced skepticism about reserve backing following questions about its asset composition during the crypto market turmoil of 2022.
For investors in Circle, the rapid convergence of competitive and regulatory threats raises questions about whether the company can maintain its premium valuation in a stablecoin market that appears destined for greater standardization and scrutiny. The company's $33.5 billion market cap—roughly 12 times trailing revenue—suggests investors have priced in significant growth and profitability that may be increasingly difficult to achieve as the industry evolves.