Exhibit 99.1 Power Integrations Reports Fourth-Quarter and Full-Year Financial Results Full-year revenue increased six percent to $443.5 million; cash flow from operations was$111.5 million Announces workforce reduction and related restructuring charge For the full year 2025, net revenue was $443.5 million, up six percent compared to the prior year. GAAP net income was$22.1 million or $0.39 per diluted share compared to$0.56 per diluted share in the prior year. Cash flow from operations for the year was ...