Exhibit 99.1 PE GREENLIGHT HOLDINGS, LLC By: /s/ Mary Ann Sigler ----------------------------------- Name: Mary Ann Sigler Title: President and Treasurer PLATINUM EQUITY CAPITAL PARTNERS IV, L.P. By: Platinum Equity Partners IV, L.P., Its: General Partner By: Platinum Equity Partners IV, LLC, Its: General Partner By: /s/ Mary Ann Sigler ----------------------------------- Name: Mary Ann Sigler Title: Vice President and Treasurer PLATINUM EQUITY PARTNERS IV, L.P. By: Platinum Equity Partners IV, LLC, Its: General Partner By: /s/ Mary Ann Sigler ----------------------------------- Name: Mary Ann Sigler Title: Vice President and Treasurer PLATINUM EQUITY PARTNERS IV, LLC By: /s/ Mary Ann Sigler ----------------------------------- Name: Mary Ann Sigler Title: Vice President and Treasurer PLATINUM EQUITY INVESTMENT HOLDINGS IV, LLC By: /s/ Mary Ann Sigler ----------------------------------- Name: Mary Ann Sigler Title: Vice President and Treasurer PLATINUM EQUITY INVESTMENT HOLDINGS IV MANAGER, LLC By: /s/ Mary Ann Sigler ----------------------------------- Name: Mary Ann Sigler Title: President PLATINUM EQUITY INVESTCO, L.P. By: Platinum Equity Investment Holdings IC (Cayman), LLC Its: General Partner By: /s/ Mary Ann Sigler ----------------------------------- Name: Mary Ann Sigler Title: President PLATINUM EQUITY INVESTMENT HOLDINGS IC (CAYMAN), LLC By: /s/ Mary Ann Sigler ----------------------------------- Name: Mary Ann Sigler Title: President PLATINUM INVESTCO, LLC By: /s/ Mary Ann Sigler ----------------------------------- Name: Mary Ann Sigler Title: President PLATINUM EQUITY INVESTMENT HOLDINGS, LLC By: /s/ Mary Ann Sigler ----------------------------------- Name: Mary Ann Sigler Title: Vice President and Treasurer PLATINUM EQUITY, LLC By: /s/ Mary Ann Sigler ----------------------------------- Name: Mary Ann Sigler Title: Executive Vice President, Chief Financial Officer and Treasurer TOM GORES By: /s/ Mary Ann Sigler ----------------------------------- Name: Mary Ann Sigler Title: Attorney-in-Fact