Harmonic's stock surged 5.03% in pre-market trading, driven by the company's better-than-expected fourth-quarter financial results and a significant increase in future business visibility.

The virtualized broadband solutions provider reported Q4 revenue of $157.3 million, surpassing analyst estimates of $141.3 million. Adjusted earnings per share came in at $0.14, beating the consensus estimate of $0.10. A key highlight was the company's backlog and deferred revenue, which jumped 73% year-over-year to $573.8 million, indicating robust demand for its services. Harmonic also reported record broadband bookings, resulting in a strong 3.5 book-to-bill ratio for the quarter.

Further bolstering investor sentiment was the announcement of a major multi-year contract with izzi, Mexico's largest cable operator, for Harmonic's cOS virtualized broadband platform. The company provided optimistic guidance for the first quarter and full year 2026, and confirmed that the sale of its Video business remains on track.