UNITED STATES
	SECURITIES AND EXCHANGE COMMISSION
	Washington, D.C.  20549



	SCHEDULE 13G


	Under the Securities Exchange Act of 1934

	(Amendment No. One)*

	ATS Automation Tooling Systems, Inc.

	(Name of Issuer)

	Common Shares

	(Title of Class of Securities)



	001940105

	(CUSIP Number)


                                	October 31, 2019
(Date of Event Which Requires Filing of this Statement)

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

        [ ] Rule 13d-1(b)
        [x] 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).







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 control number.





CUSIP No. 001940105	Schedule 13G	Page 2 of 5

1.	Name of Reporting Persons.
        I.R.S. Identification Nos. of above persons (entities only).

        Mackenzie Financial Corporation

2.	Check the Appropriate Box if a Member of a Group 	(a) [ ]
                                                                (b) [x]
3.	SEC Use Only

4.	Citizenship or Place of Organization

        Toronto, Ontario, Canada

Number of Shares Beneficially Owned by Each Reporting Person With:

5.	Sole Voting Power

         12,460,409 shares

6.	Shared Voting Power

        NIL

7.	Sole Dispositive Power

        12,460,409 shares

8.	Shared Dispositive Power

        NIL

9.	Aggregate Amount Beneficially Owned by Each Reporting Person

        12,460,409 shares

10.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares

        N/A

11.	Percent of Class Represented by Amount in Row (9)

        13.53%

12.	Type of Reporting Person (See Instructions)

        IA





Item 1.	Schedule 13G	Page 3 of 5

       (a)	Name of Issuer

             ATS Automation Tooling Systems, Inc.

       (b)	Address of Issuer's Principal Executive Offices

       	     730 Fountain Street North
             Building #2
             Cambridge, ON N3H 4R7
             CA

       (a)	Name of Person Filing

             Mackenzie Financial Corporation

       (b)	Address of Principal Business Office or, if none, Residence

             180 Queen Street West, Toronto, Ontario M5V 3K1

       (c)	Citizenship

             Organized in Toronto, Ontario, Canada

       (d)	Title of Class of Securities

             Common Shares

       (e)	CUSIP Number

             001940105


Item 3.  If this statement is filed pursuant to 240.13d-1(b) or
240.13d-2(b), or (c) check whether the person filing is a(n):

(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)	[X]	investment adviser in accordance with
240.13d-1(b)(1)(ii)(E);
(f)	[ ]	employee benefit plan or endowment fund in accordance with
240.13d-1(b)(1)(ii)(F);
(g)	[ ]	parent holding company or control person in accordance with
240.13d-1(b)(1)(ii)(G);
(h)	[ ]	savings associations as defined in Section 3(b) of the
Federal Deposit Insurance Act (12 U.S.C. 1813);













	Schedule 13G	Page 4 of 5

(i)	[ ]	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)	[ ]	Group, in accordance with 240.13d-1(b)(1)(ii)(J).


Item 4.	Ownership

Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.

       (a)	Amount beneficially owned: 12,460,409

       (b)	Percent of Class: 13.53%

       (c)	Number of shares as to which such person has:

            (i) Sole power to vote or to direct the vote - 12,460,409

           (ii) Shared power to vote or to direct the vote - NIL

          (iii) Sole power to dispose or to direct the
	        disposition of - 12,460,409

          (iv) Shared power to dispose or to direct the disposition of - NIL



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

       N/A

Item 7.	Identification and Classification of the Subsidiary Which Acquired
the Security Being Reported on By the Parent Holding Company

       N/A

Item 8.	Identification and Classification of Members of the Group

       N/A

Item 9.	Notice of Dissolution of Group

       N/A










	Schedule 13G	Page 5 of 5

Item 10.	Certification

(a)	The following certification shall be included if the
statement is filed pursuant to 240.13d-1(b):

By signing below I certify that, to the best of my knowledge and belief,
 the securities referred to above were acquired 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.

(b)	The following certification shall be included if the statement is
filed pursuant to 240.13d-1(c):

By signing below I certify that, to the best of my knowledge and belief,
the securities referred to above 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.


SIGNATURE

       After reasonable inquiry and to the best of my knowledge and belief,
 I certify that the information set forth in this statement is true,
complete and correct.


Date    November 8, 2019


        "Gillian Seidler"


	Signature
	Gillian Seidler
        Vice-President & Chief Compliance Officer

	Name/Title



       The original statement shall be signed by each person on whose behalf
the statement is filed or his authorized representative.
If the statement is signed on behalf of a person by his authorized
representative other than an executive officer or general partner of
the filing person, evidence of the representative's authority to sign
on behalf of such person shall be filed with the statement, provided,
however, that a power of attorney for this purpose which is already on
file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be
typed or printed beneath his signature.