Nokia Oyj's stock price surged 5.07% during the after-hours session on Tuesday, marking a significant upward movement following the regular trading day.

The sharp increase appears to be driven by a regulatory filing revealing that technology giant Nvidia has reported owning a stake of 166.4 million sponsored American Depositary Receipts (ADRs) in Nokia. Such a substantial investment disclosure from a major player like Nvidia often signals strong confidence in the company's prospects, prompting investor optimism.