Power Integrations POWI Share Based Compensation Arrangement By Share Based Payment Award Accelerated Compensation Cost

Stock-based compensation expense in the three months ended September 30, 2025, was approximately $21.2 million, comprising approximately $13.6 million related to the modification of outstanding equity awards held by the Company’s former chief executive officer (discussed in further detail below), $5.8 million related to restricted stock unit (“RSU”) awards, $1.5 million related to performance-based (“PSU”) awards and long-term performance-based (“PRSU”) awards and $0.3 million related to the Company’s employee stock purchase plan. Stock-based compensation expense in the nine months ended September 30, 2025, was approximately $40.0 million, comprising approximately $16.7 million for RSUs, $13.6 million related to the modification of outstanding equity awards held by the Company’s former CEO, $8.6 million related to PSUs and PRSUs and $1.1 million related to the Company’s employee stock purchase plan.