X0306 4 2019-06-30 0 0001514416 Bandwidth Inc. BAND 0001721921 Matton W. Christopher C/O BANDWIDTH INC. 900 MAIN CAMPUS DRIVE, SUITE 500 RALEIGH NC 27606 0 1 0 0 General Counsel Class A Common Stock 2019-06-30 4 M 0 1104 0.00 A 4536 D Class A Common Stock 2019-07-02 4 S 0 495 73.7803 D 4041 D Class A Common Stock 2019-07-02 4 S 0 7 75.629 D 4034 D Restricted Stock Units 2019-06-30 4 M 0 1104 0.00 D Class A Common Stock 1104 6621 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $73.57 to $74.26. The reporting person undertakes to provide Bandwidth Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Each Restricted Stock Unit represents a contingent right to receive one share of the Company's Class A Common Stock. On January 2, 2019, the Reporting Person was granted 8,829 Restricted Stock Units. One half of the Restricted Stock Units vest in four equal quarterly installments beginning on March 31, 2019. The remaining Restricted Stock Units vest in three equal annual installments beginning on January 2, 2020. /s/ W. Christopher Matton 2019-07-02