Exhibit 99.1
IPG PHOTONICS CORPORATION
SUPPLEMENTAL SCHEDULE OF STOCK-BASED COMPENSATION
| Three Months Ended September 30, | Nine Months Ended September 30, | |||||||||||||||
| (In thousands) | 2016 | 2015 | 2016 | 2015 | ||||||||||||
| Cost of sales | $ | 1,615 | $ | 1,404 | $ | 4,579 | $ | 3,919 | ||||||||
| Sales and marketing | 385 | 522 | 1,297 | 1,466 | ||||||||||||
| Research and development | 1,268 | 1,077 | 3,581 | 2,940 | ||||||||||||
| General and administrative | 2,395 | 2,010 | 6,642 | 5,550 | ||||||||||||
| Total stock-based compensation | 5,663 | 5,013 | 16,099 | 13,875 | ||||||||||||
| Tax benefit recognized | (1,817 | ) | (1,542 | ) | (5,166 | ) | (4,450 | ) | ||||||||
| Net stock-based compensation | $ | 3,846 | $ | 3,471 | $ | 10,933 | $ | 9,425 | ||||||||