Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
Spooner Steven Edward
   2. Issuer Name and Ticker or Trading Symbol
MITEL NETWORKS CORP [MITL] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chief Financial Officer
(Last)
(First)
(Middle)
350 LEGGET DRIVE, OTTAWA, A6		 3. Date of Earliest Transaction (Month/Day/Year)
03/03/2017
(Street)

K2K 2W7		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Shares 03/01/2017   M   8,650 (1) A $ 6.62 153,536 D  
Common Shares 03/02/2017   S   4,040 (2) D $ 6.5804 149,496 D  
Common Shares               14,900 I Held By Registered Retirement Savings Plan For Steven Edward Spooner
Common Shares               5,100 I Held By The Spooner Children Trust (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 1474 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units (4) 03/01/2017   M     8,650 (1)   (4)   (4) Common Shares 8,650 $ 0 8,650 D  
Performance Share Units $ 0               (5) 03/01/2020 Common Shares 67,000   67,000 D  
Restricted Stock Units $ 0               (6) 03/01/2024 Common Shares 67,000   67,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Spooner Steven Edward
350 LEGGET DRIVE
OTTAWA, A6
K2K 2W7		       Chief Financial Officer  

Signatures

 /s/ Steven Edward Spooner   03/03/2017
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Represents Common Shares received following the vesting of previously granted Restricted Stock Units ("RSUs")
(2) This sale was made to cover taxes immediately following the vesting of previously granted RSUs
(3) 5,100 common shares ("Common Shares") of Mitel Networks Corporation (the "Company") are held by the Spooner Children Trust, of which Mr. Spooner is one of three trustees, for the benefit of the children of Mr. Spooner. Mr. Spooner disclaims beneficial ownership of the Common Shares held for the benefit of his children and this report shall not be deemed an admission that Mr. Spooner is a beneficial owner of such shares for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.
(4) Represents 17,300 Common Shares underlying 17,300 RSUs granted to Mr. Spooner on April 3, 2014. These RSUs will vest as follows: (i) 8,650 of the RSUs will vest on March 1, 2017; and (ii) 8,650 of the RSUs will vest on December 15, 2017.
(5) Date exercisable for PSUs will vary for each vesting tranche based on achievement of share price performance milestones. The PSUs will expire three years from the date of grant.
(6) Represents 67,000 Common Shares underlying 67,000 RSUs granted on March 1, 2017. These RSUs vest in four equal installments annually starting March 1, 2018.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.