X0306 4 2017-12-29 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 Warrants (right to buy) 5.80 2017-12-29 4 M 0 2437 0.00 D 2017-12-31 Class B Common Stock 2437 0 D Class B Common Stock 2017-12-29 4 M 0 2437 0.00 A Class A Common Stock 2437 2437 D Class B Common Stock 2017-12-29 4 F 0 612 0.00 D Class A Common Stock 612 1825 D The warrants are currently exercisable. The shares of Class B common stock are convertible in to Class A common stock on a 1-to-1 basis at the option of the holder and have no expiration date. On December 29, 2017, the reporting person exercised a warrant to purchase 2,437 shares of the Issuer's Class B Common Stock for $5.80 a share. The reporting person paid the exercise price on a cashless basis, resulting in the Issuer's withholding of 612 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining shares. The Issuer also paid $2.19 to the reporting person in lieu of a fractional share. /s/ W. Christopher Matton 2018-01-03