Cerebras Systems Inc. (NASDAQ: CBRS) witnessed a sharp premarket selloff on Thursday, with shares dropping 18.2% to $214.45. The decline followed the company's second-quarter earnings report, which revealed a significant divergence between its adjusted (core) metrics and GAAP figures. While core revenue exceeded management's guidance, GAAP revenue fell short of Wall Street's expectations, reigniting concerns about the sustainability of the company's premium valuation.
GAAP vs. Core: A Widening Gap
The company reported GAAP revenue of $180.1 million for Q2 2026, a 74% year-over-year increase but below the $194.2 million analysts had forecast. In contrast, core revenue—which excludes certain items such as pass-through sales and customer-warrant amortization—came in at $209.9 million, beating management's guidance range of $190 million to $200 million. The $29.8 million difference between GAAP and core revenue represents 16.5% of reported revenue, a gap that investors are scrutinizing closely.
The gap extends to profitability. GAAP gross profit was $25.6 million (14.2% margin), while core gross profit reached $85.2 million (40.6% margin). GAAP operating loss widened to $477.2 million, compared to a core operating loss of $33.6 million. Stock-based compensation alone totaled $377.0 million, more than double the reported revenue, further complicating the earnings picture.
Valuation at Risk
Based on premarket trading, Cerebras' market capitalization stood at approximately $47.79 billion, implying a valuation of roughly 54 times the midpoint of its updated 2026 core-revenue outlook of $880–$890 million. The initial drop in market value was about $10.6 billion, equivalent to around 12 times the midpoint of the full-year revenue forecast. Such a rich multiple leaves minimal margin for error, and any perceived weakness in core metrics could trigger further selling.
Cloud Strength Offsets Hardware Weakness
Despite the accounting concerns, the underlying business shows robust cloud demand. CEO Andrew Feldman noted that core revenue more than doubled year-over-year, with the cloud business nearly quadrupling. Cloud and other revenue surged 281.5% to $126.0 million, representing 70% of total GAAP revenue. Hardware revenue, however, declined 23% to $54.1 million, reflecting a strategic shift toward cloud services.
The revenue mix change drove core gross margin down to 40.6% from 46.5% in the previous quarter, as the company rented capacity while building out its own infrastructure. Management expects margins to improve as the company expands its data-center footprint.
Guidance Raised, But Execution Remains Key
Looking ahead, Cerebras raised its full-year 2026 core revenue guidance to $880–$890 million, up from $855–$865 million, and lifted core gross margin expectations to 41%–43%. The company also provided Q3 core revenue guidance of $214–$216 million, roughly 2.4% higher than Q2's actual. Core operating margin is expected to improve to between -19% and -17%, a significant step up from the prior range of -32% to -28%.
However, these projections hinge on successful execution. The company has guided for Q3 core gross margin in the 38%–40% range, which would be a slight dip from Q2's 40.6%. With the stock trading at such a high multiple, even minor deviations from guidance could have outsized impacts on the share price.
Liquidity and Capital Expenditure
On the balance sheet, Cerebras ended the quarter with $6.74 billion in cash, $1.18 billion in investments, and $684.7 million in restricted cash, alongside $918.2 million in working-capital loans. This provides a substantial liquidity cushion to fund ongoing capital-intensive projects. The company spent $548.9 million on property and equipment in the first half and is targeting 600 megawatts of operational or contracted data-center capacity by the end of 2027.
Analyst Sentiment and Risks
Wall Street remains cautiously optimistic, with a consensus rating of Moderate Buy and an average price target of $300.30, implying roughly 40% upside from premarket levels. However, most published targets predate the latest earnings, and new post-earnings revisions may offer a clearer picture. Key risks include high capital expenditure, reliance on a limited customer base, competitive pressures, and the potential for ongoing GAAP volatility due to warrant accounting and stock-based compensation.
The market's reaction underscores the delicate balance between growth prospects and valuation discipline. As Cerebras navigates its expansion, investors will watch closely whether the company can translate its core revenue growth into sustainable GAAP profitability.