Rambus Inc. (RMBS) experienced a sharp pre-market decline of 20.40% on Tuesday, following the release of its first-quarter fiscal 2026 financial results after the prior session's close.

The semiconductor technology company reported adjusted earnings per share of $0.63, missing the consensus analyst estimate of $0.64. While quarterly revenue of $180.2 million was roughly in line with expectations, the company's adjusted operating margin contracted to 42%, notably below the 46% recorded in the same period last year. Furthermore, the company's second-quarter product revenue guidance projected a range of $95 million to $101 million, with a midpoint below Wall Street's expectations.

The sharp decline was also attributed to concentrated profit-taking, as the stock had surged approximately 50% over the prior month, creating substantial accumulated gains ahead of the earnings report. Market sentiment was further pressured by analyst actions, including Baird's downgrade of the stock to Neutral from Outperform.