sc13ga3.htm

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

__________________

SCHEDULE 13G/A

Under the Securities Exchange Act of 1934

(Amendment No. 1)*

__________________

MITEL NETWORKS CORP

(Name of Issuer)

Common Stock

(Title of Class of Securities)

60671Q104

(CUSIP Number)

December 31, 2017

(Date of Event Which Requires Filing of this Statement)

__________________

Check the appropriate box to designate the rule pursuant to which the Schedule is filed:

⊠ Rule 13d-1(b)

⃞ Rule 13d-1(c)

⃞ Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 60671Q104		13G/A		Page 2 of 6 Pages
(1)	Names of Reporting Persons Turtle Creek Asset Management Inc.
(2)	Check the Appropriate Box if a Member of a Group (See Instructions)				(a) ⃞ (b) ☑
(3)	SEC Use Only
(4)	Citizenship or Place of Organization Canada
Number of Shares Beneficially Owned by Each Reporting Person With		(5)	Sole Voting Power 0
		(6)	Shared Voting Power 0
		(7)	Sole Dispositive Power 0
		(8)	Shared Dispositive Power 0
(9)	Aggregate Amount Beneficially Owned by Each Reporting Person 0
(10)	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) ⃞
(11)	Percent of Class Represented by Amount in Row (9) 0%
(12)	Type of Reporting Person (See Instructions) FI

Item 1(a).	Name of Issuer

	Mitel Networks Corporation

Item 1(b).	Address of Issuer's Principal Executive Offices

	350 Legget Drive
	Ottawa, Ontario K2K 2W7 Canada

Item 2(a).	Name of Person Filing

	Turtle Creek Asset Management Inc.

Item 2(b).	Address of Principal Business Office or, if None, Residence

	4 King Street West, Suite 1300
	Toronto, Ontario M5H 1B6 Canada

Item 2(c).	Citizenship

	Canada

Item 2(d).	Title of Class of Securities

	Common Stock

Item 2(e).	CUSIP Number

	60671Q104

Item 3.	If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a:

	(a)	⃞	Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o).
	(b)	⃞	Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c).
	(c)	⃞	Insurance Company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c).
	(d)	⃞	Investment Company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).
	(e)	⃞	An investment adviser in accordance with Rule 240.13d-1(b)(1)(ii)(E);
	(f)	⃞	An employee benefit plan or endowment fund in accordance with Rule 240.13d-1(b)(1)(ii)(F);
	(g)	⃞	A parent holding company or control person in accordance with Rule 240.13d-1(b)(1)(ii)(G);

	(h)	⃞	A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
	(i)	⃞	A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
	(j)	⊠	A non-U.S. institution in accordance with Rule 240.13d-1(b)(1)(ii)(J);
	(k)	⃞	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).

	If filing in accordance with Rule 240.13d-1(b)(1)(ii)(J), please specify the type of institution: investment advisor

Item 4(a).	Amount Beneficially Owned

	See response to Item 5.

Item 4(b).	Percent of Class

	See response to Item 5.

Item 4(c).	Number of shares as to which the Reporting Person has:

	(i)	sole power to vote or direct the vote:

		0

	(ii)	shared power to vote or direct the vote:

		0

	(iii)	sole power to dispose or to direct the disposition:

		0

	(iv)	shared power to dispose or to direct the disposition:

		0

Item 5.	Ownership of Five Percent or Less of a Class

		If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following ☒.


Item 6.		Ownership of More Than Five Percent on Behalf of Another Person

		Not applicable.

Item 7.		The Security Being Reported on By the Parent Holding Company

		Not applicable.

Item 8.		Identification and Classification of Members of the Group

		Not applicable.

Item 9.		Notice of Dissolution of Group

		Not applicable.

Item 10.		Certification

		By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

		By signing below I certify that, to the best of my knowledge and belief, the foreign regulatory scheme applicable to investment advisors is substantially comparable to the regulatory scheme applicable to the functionally equivalent U.S. institution(s). I also undertake to furnish to the Commission staff, upon request, information that would otherwise be disclosed in a Schedule 13D.

SIGNATURE

After reasonable inquiry and to the best of the signatory's knowledge and belief, the signatory certifies that the information set forth in this statement is true, complete and correct.

Dated: February 9, 2018

	TURTLE CREEK ASSET MANAGEMENT INC.

	/s/ Jeffrey Cole
	By:		Jeffrey Cole
	Title:		Managing Partner