X0306 4 2016-10-03 0 0001348334 BARRACUDA NETWORKS INC CUDA 0001590392 Hughes Michael D C/O BARRACUDA NETWORKS, INC. 3175 S. WINCHESTER BLVD. CAMPBELL CA 95008 0 1 0 0 SVP, Worldwide Sales Common Stock 2016-10-03 4 A 0 4468 9.75 A 113971 D Common Stock 2016-10-03 4 S 0 4468 25.05 D 109503 D Employee Stock Option (right to buy) 9.75 2016-10-01 4 M 0 4468 0.00 D 2010-11-30 2019-11-30 Common Stock 4468 26064 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 12, 2016. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.86 to $25.48, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price. 25% of shares subject to the option vested on November 30, 2010 and 1/48 of the shares subject to the option vested monthly thereafter, so that all shares were fully vested on 11/30/2013. /s/ Diane Honda Attorney-in-Fact for Michael D Hughes 2016-10-04