Exhibit 99.1 VIAVI Announces Fiscal Fourth Quarter and Fiscal Year 2025 Results Chandler, Arizona, August 7, 2025 — VIAVI (NASDAQ: VIAV) today reported results for its fiscal fourth quarter and fiscal year ended June 28, 2025 with the following highlights. Fiscal Fourth Quarter Fiscal Year 2025 "VIAVI had a strong finish to Fiscal 2025,with fourth quarter performance at high end of our guidance. During the year, we saw stabilization in our base businesses, the service provider test and measurement segment a ...