X0306 4 2017-09-26 0001170534 MITEL NETWORKS CORP MITL 0001214422 MCBEE RICHARD D 350 LEGGET DRIVE OTTAWA, A6 K2K 2W7 1 1 See Remarks Common Shares 2017-09-26 4 M 0 47500 5.16 A 315147 D Common Shares 2017-09-26 4 D 0 47500 8.20 D 267647 D Options (Common Shares) 5.16 2017-09-26 4 M 0 47500 0 D 2018-01-19 Common Shares 47500 52750 D Transaction made pursuant to duly adopted trading plan under Rule 10b5-1 of the Securities Exchange Act of 1934, as amended. This transaction was executed in multiple trades at prices ranging from $8.10 to $8.25. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. 892,575 stock options to purchase Common Shares of the Company were granted to Mr. McBee on January 19, 2011. 61,551 options vested on April 19, 2011 and vested in approximately equal installments every three months thereafter until January 19, 2015. /s/ Richard D. McBee 2017-09-27