Harmonic's stock surged 6.43% in after-hours trading following the release of its fourth-quarter financial results and the announcement of a significant new business partnership.

The company reported Q4 revenue of $157.3 million, exceeding analyst estimates of $141.3 million. Adjusted earnings per share also beat expectations, coming in at $0.14 compared to the $0.10 consensus estimate. Additionally, Harmonic disclosed a substantial 73% year-over-year increase in backlog and deferred revenue, reaching $573.8 million, indicating strong future business visibility.

Separately, Harmonic announced that izzi, Mexico's largest cable operator and a Televisa Group subsidiary, has selected Harmonic's cOS virtualized broadband platform for its strategic fiber broadband expansion. This multi-year deployment deal represents a significant win for Harmonic's broadband solutions in a key international market.