X0306 4 2018-06-21 0 0001514416 Bandwidth Inc. BAND 0001721985 Murdock John C. C/O BANDWIDTH INC. 900 MAIN CAMPUS DRIVE, SUITE 500 RALEIGH NC 27606 1 1 1 0 President Class A Common Stock 2018-06-21 4 C 0 1524 0.00 A 1524 D Class A Common Stock 2018-06-21 4 S 0 1524 40.00 D 0 D Class A Common Stock 2018-06-22 4 C 0 9720 0.00 A 9720 D Class A Common Stock 2018-06-22 4 S 0 9720 40.0256 D 0 D Stock Option (right to buy) 5.80 2018-06-21 4 M 0 1524 0.00 D 2018-10-01 Class B Common Stock 1524 27797 D Class B Common Stock 2018-06-21 4 M 0 1524 0.00 A Class A Common Stock 1524 93906 D Class B Common Stock 2018-06-21 4 C 0 1524 0.00 D Class A Common Stock 1524 92382 D Stock Option (right to buy) 5.80 2018-06-22 4 M 0 9720 0.00 D 2018-10-01 Class B Common Stock 9720 18077 D Class B Common Stock 2018-06-22 4 M 0 9720 0.00 A Class A Common Stock 9720 102102 D Class B Common Stock 2018-06-22 4 C 0 9720 0.00 D Class A Common Stock 9720 92382 D Class B Common Stock Class A Common Stock 52409 52409 I By John C. Murdock Family Line Trust Class B Common Stock Class A Common Stock 52007 52007 I By Murdock Trust 'D' u/a dated May 16, 2005 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 $40.00 to $40.14. 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. The stock option is currently exercisable. The shares of Class B common stock are convertible into Class A common stock on a 1-to-1 basis at the option of the holder and have no expiration date. /s/ Jeffrey A. Hoffman, Attorney-in-Fact for John C. Murdock 2018-06-25