X0306 4 2018-02-28 0001170534 MITEL NETWORKS CORP MITL 0001692658 Hiscock Gregory James 350 LEGGET DRIVE OTTAWA, A6 K2K 2W7 1 See Remarks Common Shares 2018-03-05 4 M 0 3100 0 A 16060 D Common Shares 2018-03-05 4 M 0 3000 0 A 19060 D Common Shares 2018-03-06 4 S 0 2866 8.0086 D 16194 D Restricted Stock Units 2018-02-28 4 A 0 20000 A Common Shares 20000 20000 D Restricted Stock Units 0 2018-03-05 4 M 0 3100 0 D 2022-03-05 Common Shares 3100 6200 D Restricted Stock Units 0 2018-03-05 4 M 0 3000 0 D 2023-03-04 Common Shares 3000 6000 D Represents the automatic withholding of Common Shares to satisfy tax withholding obligations in connection with the vesting of RSUs. Represents 20,000 Common Shares underlying 20,000 RSUs granted on February 28, 2018. These RSUs vest in four equal installments annually starting February 28, 2019. The late filing of this equity award is due to a clerical error. Represents 9,300 Common Shares underlying 9,300 RSUs granted to Mr. Hiscock on March 5, 2015. These RSUs will vest as follows: (i) 3,100 of the RSUs will vest on March 5, 2017; (ii) 3,100 of the RSUs will vest on March 5, 2018; and (iii) 3,100 of the RSUs will vest on March 5, 2019. Represents 12,000 Common Shares underlying 12,000 Restricted Stock Units ("RSUs") granted to Mr. Hiscock on March 4, 2016. These RSUs will vest as follows: (i) 3,000 of the RSUs will vest on March 4, 2017; (ii) 3,000 of the RSUs will vest on March 4, 2018; (iii) 3,000 of the RSUs will vest on March 4, 2019; and (iv) 3,000 of the RSUs will vest on March 4, 2020. /s/ Gregory James Hiscock 2018-03-07