Lumen Technologies (LUMN) shares are experiencing a significant pre-market plunge of 16.83% on Friday, marking a sharp reversal from its overnight gains. The dramatic shift comes in the wake of mixed reactions to the company's third-quarter results and a notable downgrade from a major financial institution.

Initially, Lumen Technologies saw its shares climb 6.4% in overnight trading following the release of its Q3 earnings report. The company had managed to edge past third-quarter revenue estimates and posted a smaller-than-expected loss, driven by demand for its network infrastructure to support massive data flows and computational workloads amid an AI boom.

However, the positive sentiment was short-lived as Citi downgraded Lumen from Buy to Neutral with a price target of $11. This downgrade appears to have sparked a sell-off, contributing significantly to the pre-market plunge. The swift change in investor sentiment underscores the market's sensitivity to analyst opinions and the challenges facing Lumen Technologies in the competitive telecommunications landscape.