SC 13D/A 1 tm2222666d1_sc13da.htm SC 13D/A

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 13D/A

(Amendment No. 11)

Under the Securities Exchange Act of 1934

Atlas Corp.

(Name of Issuer)

Common Shares, par value $0.01 per share

(Title of Class of Securities)

Y0436Q109

(CUSIP Number)

Peter Clarke

President and Chief Operating Officer

Fairfax Financial Holdings Limited

95 Wellington Street West, Suite 800

Toronto, Ontario, Canada, M5J 2N7

Telephone: (416) 367-4941

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

- With a copy to -

Jason R. Lehner

Sean J. Skiffington

Shearman & Sterling LLP

Commerce Court West

199 Bay Street, Suite 4405

Toronto, Ontario M5L 1E8

Telephone (416) 360-8484

August 4, 2022

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box ¨.

The information required on 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. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

V. PREM WATSA

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Canadian

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

131,759,155

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

131,759,155

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

131,759,155

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

51.1%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

THE SECOND 810 HOLDCO LTD.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Canada

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

131,759,155

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

131,759,155

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

131,759,155

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

51.1%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

THE SECOND 1109 HOLDCO LTD.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Canada

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

131,081,134

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

131,081,134

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

131,081,134

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

50.8%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

THE SIXTY TWO INVESTMENT COMPANY LIMITED

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

British Columbia

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

131,081,134

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

131,081,134

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

131,081,134

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

50.8%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

12002574 CANADA INC.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Canada

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

131,081,134

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

131,081,134

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

131,081,134

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

50.8%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

FAIRFAX FINANCIAL HOLDINGS LIMITED

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Canada

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

131,081,134

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

131,081,134

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

131,081,134

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

50.8%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

FFHL GROUP LTD.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Canada

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

90,418,215

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

90,418,215

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

90,418,215

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

35.1%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

FAIRFAX (BARBADOS) INTERNATIONAL CORP.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Barbados

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

10,478,017

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

10,478,017

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

10,478,017

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

4.1%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

WENTWORTH INSURANCE COMPANY LTD.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Barbados

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

10,325,879

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

10,325,879

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

10,325,879

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

4.0%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

THE SIXTY THREE FOUNDATION

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Canada

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

231,922

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

231,922

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

231,922

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

0.1%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

FAIRFAX (US) INC.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

73,025,299

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

73,025,299

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

73,025,299

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

28.3%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

ODYSSEY US HOLDINGS INC.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

50,772,519

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

50,772,519

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

50,772,519

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

19.7%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

ODYSSEY GROUP HOLDINGS, INC.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

50,772,519

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

50,772,519

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

50,772,519

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

19.7%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

ODYSSEY REINSURANCE COMPANY

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Connecticut

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

46,107,152

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

46,107,152

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

46,107,152

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

17.9%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

GREYSTONE INSURANCE COMPANY

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Connecticut

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

4,457,990

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

4,457,990

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

4,457,990

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

1.7%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

NEWLINE HOLDINGS UK LIMITED

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

ENGLAND AND WALES

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

1,090,885

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

1,090,885

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,090,885

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

0.4%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

NEWLINE CORPORATE NAME LIMITED

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

ENGLAND AND WALES

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

1,090,885

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

1,090,885

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,090,885

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

0.4%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

HUDSON INSURANCE COMPANY

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

4,838,579

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

4,838,579

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

4,838,579

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

1.9%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

HILLTOP SPECIALTY INSURANCE COMPANY

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

New York

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

265,111

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

265,111

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

265,111

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

0.1%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

HUDSON EXCESS INSURANCE COMPANY

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

745,700

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

745,700

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

745,700

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

0.3%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

1102952 B.C. UNLIMITED LIABILITY COMPANY

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

British Columbia

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

26,415,922

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

26,415,922

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

26,415,922

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

10.2%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, LTD

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Bermuda

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

26,415,922

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

26,415,922

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

26,415,922

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

10.2%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

ALLIED WORLD ASSURANCE COMPANY HOLDINGS I, LTD

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Bermuda

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

26,415,922

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

26,415,922

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

26,415,922

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

10.2%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

ALLIED WORLD ASSURANCE COMPANY, LTD

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Bermuda

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

26,415,922

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

26,415,922

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

26,415,922

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

10.2%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

ALLIED WORLD ASSURANCE HOLDINGS (IRELAND) LTD

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Bermuda

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

19,978,170

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

19,978,170

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

19,978,170

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

7.7%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

ALLIED WORLD ASSURANCE HOLDINGS (U.S.) INC.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

16,727,358

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

16,727,358

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

16,727,358

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

6.5%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

ALLIED WORLD INSURANCE COMPANY

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ¨

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). ¨

CITIZENSHIP OR PLACE OF ORGANIZATION

New Hampshire

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

16,714,025

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

16,714,025

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

16,714,025

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

6.5%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

AW UNDERWRITERS INC.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) o

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). o

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

5,904,625

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

5,904,625

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

5,904,625

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

2.3%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

ALLIED WORLD SPECIALTY INSURANCE COMPANY

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) o

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). o

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SHARED VOTING POWER

5,904,625

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

5,904,625

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

5,904,625

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES ¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

2.3%

TYPE OF REPORTING PERSON

CUSIP No. Y0436Q109

13D

Names of Reporting Person/I.R.S. Identification Nos. of Above Persons (Entities Only)

ALLIED WORLD SURPLUS LINES INSURANCE COMPANY

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) o

(b) x

SEC USE ONLY

SOURCE OF FUNDS

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E). o

CITIZENSHIP OR PLACE OF ORGANIZATION

Arkansas

NUMBER OF SHARES
BENEFICIALLY
OWNED BY EACH
REPORTING
PERSON WITH

SOLE VOTING POWER

SEC Form SC 13D/A filed by Atlas Corp. (Amendment)