On December 30, 2020, Calix, Inc. entered into the first amendment to loan and security agreement, which amended the loan and security agreement, dated as of January 27, 2020, by and among the company, the financial institutions party thereto from time to time as Lenders and Bank of America, N.A., as agent for the Lenders. The loan and security agreement provides for a revolving credit facility up to a principal amount of $35,000,000 (the secured revolving line of credit), including a $10,000,000 sublimit for letters of credit, with the option to increase the line of credit to up to $60,000,000 upon meeting certain conditions. The amendment revises the unused line fee applicable to the secured revolving line of credit to equal 0.25% per annum and makes certain other amendments to the covenants regarding the delivery of borrowing base reports and Agent’s right to conduct field examinations or request an appraisal.