Rambus Inc. (RMBS) experienced a significant pre-market plunge of 15.57% on Tuesday, as investors reacted negatively to the company's forward-looking financial guidance.

While the semiconductor technology company reported solid fourth-quarter 2025 results, with adjusted earnings per share of $0.68 meeting analyst expectations and revenue of $190.2 million exceeding estimates, the market focused on the disappointing outlook for the first quarter of 2026. The company projected product revenue between $84 million and $90 million for Q1, which represents a potential sequential decline from the record $96.8 million achieved in Q4 2025 and falls below analyst forecasts of approximately $96.5 million.

The substantial pre-market selloff reflects investor concerns about Rambus's near-term growth prospects, overshadowing the positive Q4 performance that included 18% year-over-year revenue growth and record quarterly cash from operations of $99.8 million.