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13G Filing: Balyasny Asset Management Reveals Large Stake in Dean Foods Co (DF)

Published on February 15, 2016 at 10:51 am by Meena Krishnamsetty in Hedge Funds, News

A new 13G filing has been submitted to the SEC by Dmitry Balyasny‘s Balyasny Asset Management, in relation to the investor’s position in Dean Foods Co (NYSE:DF). The filing reveals the latest share ownership information of all relevant parties and subsidiaries of the investor, which you can see embedded in the table below. All told, Mr. Balyasny now holds 4.86 million shares of Dean Foods, a huge step up from the mere 20,034 shares that he reported owning as of September 30.

You can access the original SEC filing by clicking here.

Ownership Summary Table

Name Sole Voting Power Shared Voting Power Sole Dispositive Power Shared Dispositive Power Aggregate Amount Owned Power Percent of Class
Atlas Master Fund, Ltd. 1,115,044 1,115,044 1,115,044 1.22%
Atlas Global, 1,115,044 1,115,044 1,115,044 1.22%
Atlas Global Investments, Ltd. 1,115,044 1,115,044 1,115,044 1.22%
Atlas Institutional Fund, 1,115,044 1,115,044 1,115,044 1.22%
Atlas Institutional Fund, Ltd. 1,115,044 1,115,044 1,115,044 1.22%
Atlas Institutional Fund II, 1,115,044 1,115,044 1,115,044 1.22%
Atlas Institutional Fund II, Ltd. 1,115,044 1,115,044 1,115,044 1.22%
Atlas Global Japan Unit Trust 1,115,044 1,115,044 1,115,044 1.22%
Atlas Enhanced Master Fund, Ltd. 3,394,236 3,394,236 3,394,236 3.72%
Atlas Enhanced Fund, 3,394,236 3,394,236 3,394,236 3.72%
Atlas Enhanced Fund, Ltd. 3,394,236 3,394,236 3,394,236 3.72%
Atlas Fundamental Trading Master Fund, Ltd. 179,609 179,609 179,609 0.20%
Atlas Fundamental Trading Fund, Ltd. 179,609 179,609 179,609 0.20%
Atlas Fundamental Trading Fund, 179,609 179,609 179,609 0.20%
Lyxor Balyasny Atlas Enhanced Fund Limited 158,413 158,413 158,413 0.17%
Atlas Quantitative Trading Fund, Ltd. 14,053 14,053 14,053 0.02%
Balyasny Asset Management 4,861,355 4,861,355 4,861,355 5.32%
Dmitry Balyasny 4,861,355 4,861,355 4,861,355 5.32%

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Page 1 of 37 SEC Filing

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

DEAN FOODS CO

(Name of Issuer)

COMMON STOCK

(Title of
Class of Securities)

242370203

(CUSIP Number)

February 2, 2016

(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 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).

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Page 2 of 37 SEC Filing

CUSIP No. 242370203 Page
2
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Master Fund, Ltd.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Cayman

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

1,115,044 (See Item 4)
6

SHARED VOTING POWER

None (see Item 4)
7

SOLE DISPOSITIVE POWER

1,115,044 (See Item 4)
8

SHARED DISPOSITIVE POWER

None
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,115,044 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

1.22%
12

TYPE OF REPORTING PERSON*

CO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

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Page 3 of 37 SEC Filing

CUSIP No. 242370203 Page
3
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Global, LLC
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

1,115,044
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

1,115,044
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,115,044 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

1.22%
12

TYPE OF REPORTING PERSON*

OO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

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Page 4 of 37 SEC Filing

CUSIP No. 242370203 Page
4
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Global Investments, Ltd.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Cayman

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

1,115,044
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

1,115,044
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,115,044 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

1.22%
12

TYPE OF REPORTING PERSON*

CO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

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Page 5 of 37 SEC Filing

CUSIP No. 242370203 Page
5
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Institutional Fund, LLC
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

1,115,044
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

1,115,044
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,115,044 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

1.22%
12

TYPE OF REPORTING PERSON*

OO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

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Page 6 of 37 SEC Filing

CUSIP No. 242370203 Page
6
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Institutional Fund, Ltd.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Cayman

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

1,115,044
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

1,115,044
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,115,044 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

1.22%
12

TYPE OF REPORTING PERSON*

CO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

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Page 7 of 37 SEC Filing

CUSIP No. 242370203 Page
7
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Institutional Fund II, LLC
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

1,115,044
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

1,115,044
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,115,044 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

1.22%
12

TYPE OF REPORTING PERSON*

OO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

Follow Dean Foods Co (NYSE:DF)

Page 8 of 37 SEC Filing

CUSIP No. 242370203 Page
8
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Institutional Fund II, Ltd.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Cayman

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

1,115,044
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

1,115,044
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,115,044 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

1.22%
12

TYPE OF REPORTING PERSON*

CO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

Follow Dean Foods Co (NYSE:DF)

Page 9 of 37 SEC Filing

CUSIP No. 242370203 Page
9
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Global Japan Unit Trust
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Cayman

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

1,115,044
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

1,115,044
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,115,044 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

1.22%
12

TYPE OF REPORTING PERSON*

OO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

Follow Dean Foods Co (NYSE:DF)

Page 10 of 37 SEC Filing

CUSIP No. 242370203 Page
10
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Enhanced Master Fund, Ltd.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Cayman

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

3,394,236
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

3,394,236
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

3,394,236 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

3.72%
12

TYPE OF REPORTING PERSON*

CO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

Follow Dean Foods Co (NYSE:DF)

Page 11 of 37 SEC Filing

CUSIP No. 242370203 Page
11
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Enhanced Fund, L.P.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

3,394,236
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

3,394,236
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

3,394,236 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

3.72%
12

TYPE OF REPORTING PERSON*

OO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

Follow Dean Foods Co (NYSE:DF)

Page 12 of 37 SEC Filing

CUSIP No. 242370203 Page
12
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Enhanced Fund, Ltd.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Cayman

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

3,394,236
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

3,394,236
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

3,394,236 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

3.72%
12

TYPE OF REPORTING PERSON*

CO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

Follow Dean Foods Co (NYSE:DF)

Page 13 of 37 SEC Filing

CUSIP No. 242370203 Page
13
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Fundamental Trading Master Fund, Ltd.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Cayman

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

179,609
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

179,609
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

179,609 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

0.20%
12

TYPE OF REPORTING PERSON*

CO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

Follow Dean Foods Co (NYSE:DF)

Page 14 of 37 SEC Filing

CUSIP No. 242370203 Page
14
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Fundamental Trading Fund, Ltd.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Cayman

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

179,609
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

179,609
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

179,609 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

0.20%
12

TYPE OF REPORTING PERSON*

CO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

Follow Dean Foods Co (NYSE:DF)

Page 15 of 37 SEC Filing

CUSIP No. 242370203 Page
15
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Fundamental Trading Fund, L.P.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

179,609
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

179,609
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

179,609 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

0.20%
12

TYPE OF REPORTING PERSON*

OO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

Follow Dean Foods Co (NYSE:DF)

Page 16 of 37 SEC Filing

CUSIP No. 242370203 Page
16
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Lyxor/Balyasny Atlas Enhanced Fund Limited
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Jersey

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

158,413
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

158,413
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

158,413 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

0.17%
12

TYPE OF REPORTING PERSON*

CO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

Follow Dean Foods Co (NYSE:DF)

Page 17 of 37 SEC Filing

CUSIP No. 242370203 Page
17
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Atlas Quantitative Trading Fund, Ltd.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Cayman

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

14,053
6

SHARED VOTING POWER

None (See Item 4)
7

SOLE DISPOSITIVE POWER

14,053
8

SHARED DISPOSITIVE POWER

None (See Item 4)
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

14,053 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

0.02%
12

TYPE OF REPORTING PERSON*

CO
* SEE INSTRUCTIONS BEFORE FILLING OUT.

Follow Dean Foods Co (NYSE:DF)

Page 18 of 37 SEC Filing

CUSIP No. 242370203 Page
18
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Balyasny Asset Management L.P.
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

4,861,355 (See Item 4)
6

SHARED VOTING POWER

None
7

SOLE DISPOSITIVE POWER

4,861,355 (See Item 4)
8

SHARED DISPOSITIVE POWER

None
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

4,861,355 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

5.32%
12

TYPE OF REPORTING PERSON*

IA
* SEE INSTRUCTIONS BEFORE FILLING OUT.

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Page 19 of 37 SEC Filing

CUSIP No. 242370203 Page
19
of 37 Pages
  1

NAMES OF
REPORTING PERSONS

I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

Dmitry Balyasny
  2

CHECK THE APPROPRIATE BOX IF A MEMBER
OF A GROUP*

(a)  ¨        (b)  ¨
  3

SEC USE ONLY
  4

CITIZENSHIP OR PLACE OF
ORGANIZATION

United States

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

 5

SOLE VOTING POWER

4,861,355 (See Item 4)
6

SHARED VOTING POWER

None
7

SOLE DISPOSITIVE POWER

4,861,355 (See Item 4)
8

SHARED DISPOSITIVE POWER

None
  9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

4,861,355 (See Item 4)
10

CHECK BOX IF THE AGGREGATE AMOUNT IN
ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable

¨
11

PERCENT OF CLASS REPRESENTED BY AMOUNT
IN ROW (9)

5.32%
12

TYPE OF REPORTING PERSON*

IN
* SEE INSTRUCTIONS BEFORE FILLING OUT.

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Page 20 of 37 SEC Filing

Item 1 (a) Name of Issuer:

     Dean
Foods Co. (the Company)

(b) Address of Issuers Principal Executive Offices:

     2711 North Haskell Avenue, Suite 3400

     Dallas, TX 75204

     United States

Item 2 (a) (c) This statement is filed on behalf of the following:

(1) Atlas Master Fund, Ltd. is a Cayman corporation (AMF), with its principal business office at c/o Maples
Corporate Services Limited, P.O. Box 309, Ugland House, George Town, Grand Cayman KY1-1104, Cayman Islands, British West Indies.

(2) Atlas Global, LLC is a Delaware limited liability company (AG), with its principal business office at 181 West
Madison, Suite 3600, Chicago, IL 60602. AG owns 16.33% of the equity interests in AMF.

(3) Atlas Global Investments, Ltd.
is a Cayman corporation (AGI), with its principal business office at c/o Maples Corporate Services Limited, P.O. Box 309, Ugland House, George Town, Grand Cayman KY1-1104, Cayman Islands, British West Indies. AGI owns 23.53% of the
equity interests in AMF.

(4) Atlas Institutional Fund, LLC is a Delaware limited liability company (AIF LLC),
with its principal business office at 181 West Madison, Suite 3600, Chicago, IL 60602. AIF LLC owns 6.00% of the equity interests in AMF.

(5) Atlas Institutional Fund, Ltd. is a Cayman corporation (AIF LTD), with its principal business office at
c/o Maples Corporate Services Limited, P.O. Box 309, Ugland House, George Town, Grand Cayman KY1-1104, Cayman Islands, British West Indies. AIF, LTD owns 17.43% of the equity interests in AMF.

(6) Atlas Institutional Fund II, LLC is a Delaware limited liability company (AIF2 LLC), with its principal
business office at 181 West Madison, Suite 3600, and Chicago, IL 60602. AIF2 LLC owns 9.49% of the equity interests in AMF.

(7) Atlas Institutional Fund II, Ltd. is a Cayman corporation (AIF2 LTD), with its principal business office at
c/o Maples Corporate Services Limited, P.O. Box 309, Ugland House, George Town, Grand Cayman KY1-1104, Cayman Islands, British West Indies. AIF2 LTD owns 8.79% of the equity interests in AMF.

Page 20 of 37 Pages

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Page 21 of 37 SEC Filing

(8) Atlas Global Japan Unit Trust is a Cayman exempted unit trust
(AGJ), with its principal business office at c/o CIBC Bank and Trust Company (Cayman) Limited, CIBC Financial Centre, 11 Dr. Roys Drive-3rd Floor, P.O. Box 694, Grand
Cayman, Cayman Islands, British West Indies. AGJ owns 8.54% of the equity interests in AMF.

(9) Atlas Enhanced Master
Fund, Ltd. is a Cayman corporation (AEMF), with its principal business office at c/o Maples Corporate Services Limited, P.O. Box 309, Ugland House, George Town, Grand Cayman KY1-1104, Cayman Islands, British West Indies.

(10) Atlas Enhanced Fund, L.P. is a Delaware limited partnership (AEF LP), with its principal business office at
181 West Madison, Suite 3600, Chicago, IL 60602. AEF LP owns 28.38% of the equity interests in AEMF.

(11) Atlas Enhanced
Fund, Ltd. is a Cayman corporation (AEF LTD), with its principal business office at c/o Maples Corporate Services Limited, P.O. Box 309, Ugland House, George Town, Grand Cayman KY1-1104, Cayman Islands, British West Indies. AEF LTD
owns 71.35% of the equity interests in AEMF.

(12) Atlas Fundamental Trading Master Fund Ltd. is a Cayman corporation
(AFT MASTER), with its principal business office at c/o Maples Corporate Services Limited, P.O. Box 309, Ugland House, George Town, Grand Cayman KY1-1104, Cayman Islands, British West Indies.

(13) Atlas Fundamental Trading Fund, L.P., is a Delaware limited partnership (AFT LP), with its principal business
office at 181 West Madison, Suite 3600, Chicago, IL 60602. AFT LP owns 72.42% of the equity interests in AFT MASTER.

(14)
Atlas Fundamental Trading Fund Ltd. is a Cayman corporation (AFT LTD), with its principal business office at c/o Maples Corporate Services Limited, P.O. Box 309, Ugland House, George Town, Grand Cayman KY1-1104, Cayman Islands,
British West Indies. AFT LTD owns 27.42% of the equity interests in AFT MASTER

(15) Lyxor/Balyasny Atlas Enhanced Fund
Limited is a Jersey limited corporation (LYXOR), with its registered office at 18 Esplanade, St. Helier, Jersey JE4 8RT, Channel Islands.

(16) Atlas Quantitative Trading Fund, Ltd. is a Cayman corporation (AQTF), with its principal business office at
c/o Maples Corporate Services Limited, P.O. Box 309, Ugland House, George Town, Grand Cayman KY1-1104, Cayman Islands, British West Indies.

Page 21 of 37 Pages

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Page 22 of 37 SEC Filing

(17) Balyasny Asset Management L.P. is a Delaware limited partnership
(BAM), with its principal business office at 181 West Madison, Suite 3600, and Chicago, IL 60602. BAM is the investment manager to each of AMF, AG, AGI, AIF LLC, AIF LTD, AIF2 LLC, AIF2 LTD, AGJ, AEMF, AEF LP, AEF LTD, AFT MASTER, AFT
LP, AFT LTD, LYXOR and AQTF.

(18) Dmitry Balyasny, a United States citizen whose business address is 181 West Madison,
Suite 3600, Chicago, IL 60602. Dmitry Balyasny is the sole managing member of the general partner of BAM.

(d) Title of Class of Securities:
Common Stock
(e) CUSIP Number: 242370203
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:

Not Applicable

Item 4 Ownership:

AMF

(a) Amount Beneficially Owned:

1,115,044

(b) Percent of Class:

1.22%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

1,115,044

(ii) Shared power to vote or to direct vote:

None

Page 22 of 37 Pages

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Page 23 of 37 SEC Filing

(iii) Sole power to dispose or direct disposition of:

1,115,044

(iv) Shared power to dispose or to direct disposition of:

None

AG

(a) Amount Beneficially Owned:

By virtue of its ownership of 16.33% of the equity interest
in AMF, AG may be deemed to beneficially own the 1,115,044 Shares of the Companys Common Stock beneficially owned by AMF.

(b) Percent of Class:

1.22%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

1,115,044

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

1,115,044

(iv) Shared power to dispose or to direct disposition of:

None

Page 23 of 37 Pages

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Page 24 of 37 SEC Filing

AGI

(a) Amount Beneficially Owned:

By virtue of its ownership of 23.53% of the equity interest
in AMF, AGI may be deemed to beneficially own the 1,115,044 Shares of the Companys Common Stock beneficially owned by AMF.

(b) Percent of Class:

1.22%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

1,115,044

(ii) Shared power to vote or to direct vote:

None

(ii) Sole power to dispose or direct disposition of:

1,115,044

(iv) Shared power to dispose or to direct disposition of:

None

AIF LLC

(a) Amount Beneficially Owned:

By virtue of its ownership of 6.00% of the equity interest
in AMF, AIF LLC may be deemed to beneficially own the 1,115,044 Shares of the Companys Common Stock beneficially owned by AMF.

(b) Percent of Class:

1.22%

Page 24 of 37 Pages

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Page 25 of 37 SEC Filing

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

1,115,044

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

1,115,044

(iv) Shared power to dispose or to direct disposition of:

None

AIF LTD

(a) Amount Beneficially Owned:

By virtue of its ownership of 17.43% of the equity interest
in AMF, AIF LTD may be deemed to beneficially own the 1,115,044 Shares of the Companys Common Stock beneficially owned by AMF.

(b) Percent of Class:

1.22%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

1,115,044

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

1,115,044

Page 25 of 37 Pages

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Page 26 of 37 SEC Filing

(iv) Shared power to dispose or to direct disposition of:

None

AIF2 LLC

(a) Amount Beneficially Owned:

By virtue of its ownership of 9.49% of the equity interest
in AMF, AIF2 LLC may be deemed to beneficially own the 1,115,044 Shares of the Companys Common Stock beneficially owned by AMF.

(b) Percent of Class:

1.22%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

1,115,044

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

1,115,044

(iv) Shared power to dispose or to direct disposition of:

None

AIF2 LTD

(a) Amount Beneficially Owned:

By virtue of its ownership of 8.79% of the equity interest
in AMF, AIF2 LTD may be deemed to beneficially own the 1,115,044 Shares of the Companys Common Stock beneficially owned by AMF.

(b) Percent of Class:

1.22%

Page 26 of 37 Pages

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Page 27 of 37 SEC Filing

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

1,115,044

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

1,115,044

(iv) Shared power to dispose or to direct disposition of:

None

AGJ

(a) Amount Beneficially Owned:

By virtue of its ownership of 8.54% of the equity interest
in AMF, AGJ may be deemed to beneficially own the 1,115,044 Shares of the Companys Common Stock beneficially owned by AMF.

(b) Percent of Class:

1.22%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

1,115,044

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

1,115,044

Page 27 of 37 Pages

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Page 28 of 37 SEC Filing

(iv) Shared power to dispose or to direct disposition of:

None

AEMF

(a) Amount Beneficially Owned:

3,394,236

(b) Percent of Class:

3.72%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

3,394,236

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

3,394,236

(iv) Shared power to dispose or to direct disposition of:

None

AEF LP

(a) Amount Beneficially Owned:

By virtue of its ownership of 28.38% of the equity interest
in AEMF, AEF LP may be deemed to beneficially own the 3,394,236 Shares of the Companys Common Stock beneficially owned by AEMF.

(b) Percent of Class:

3.72%

Page 28 of 37 Pages

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Page 29 of 37 SEC Filing

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

3,394,236

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

3,394,236

(iv) Shared power to dispose or to direct disposition of:

None

AEF LTD

(a) Amount Beneficially Owned:

By virtue of its ownership of 71.35% of the equity interest
in AEMF, AEF LTD may be deemed to beneficially own the 3,394,236 Shares of the Companys Common Stock beneficially owned by AEMF.

(b) Percent of Class:

3.72%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

3,394,236

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

3,394,236

Page 29 of 37 Pages

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Page 30 of 37 SEC Filing

(iv) Shared power to dispose or to direct disposition of:

None

AFT MASTER

(a) Amount Beneficially Owned:

179,609

(b) Percent of Class:

0.20%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

179,609

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

179,609

(iv) Shared power to dispose or to direct disposition of:

None

AFT LP

(a) Amount Beneficially Owned:

By virtue of its ownership of 72.42% of the equity interest
in AFT MASTER, AFT LP may be deemed to beneficially own the 179,609 Shares of the Companys Common Stock beneficially owned by AFT MASTER.

(b) Percent of Class:

0.20%

Page 30 of 37 Pages

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Page 31 of 37 SEC Filing

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

179,609

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

179,609

(iv) Shared power to dispose or to direct disposition of:

None

AFT LTD

(a) Amount Beneficially Owned:

By virtue of its ownership of 27.42% of the equity interest
in AFT MASTER, AFT LTD may be deemed to beneficially own the 179,609 Shares of the Companys Common Stock beneficially owned by AFT MASTER.

(b) Percent of Class:

0.20%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

179,609

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

179,609

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(iv) Shared power to dispose or to direct disposition of:

None

LYXOR

(a) Amount Beneficially Owned:

158,413

(b) Percent of Class:

0.17%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

158,413

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

158,413

(iv) Shared power to dispose or to direct disposition of:

None

AQTF

(a) Amount Beneficially Owned:

14,053

(b) Percent of Class:

0.02%

Page 32 of 37 Pages

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Page 33 of 37 SEC Filing

(c) Number of Shares as to which person has:
(ii) Sole power to vote or to direct vote:

14,053

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

14,053

(iv) Shared power to dispose or to direct disposition of:

None

BAM

(a) Amount Beneficially Owned:

By virtue of its position as investment manager to each of
AMF, AG, AGI, AIF LLC, AIF LTD, AIF2 LLC, AIF2 LTD, AGJ, AEMF, AEF LP, AEF LTD, AFT MASTER, AFT LP, AFT LTD, LYXOR and AQTF, BAM may be deemed to beneficially own the 4,861,355 Shares of the Companys Common Stock beneficially owned by AMF, AG,
AGI, AIF LLC, AIF LTD, AIF2 LLC, AIF2 LTD, AGJ, AEMF, AEF LP, AEF LTD, AFT MASTER, AFT LP, AFT LTD, LYXOR and AQTF.

(b) Percent of Class:

5.32%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

4,861,355

(ii) Shared power to vote or to direct vote:

None

Page 33 of 37 Pages

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Page 34 of 37 SEC Filing

(iii) Sole power to dispose or direct disposition of:

4,861,355

(iv) Shared power to dispose or to direct disposition of:

None

Dmitry Balyasny

(a) Amount Beneficially Owned:

By virtue of his position as the sole managing member of
the general partner of BAM, Mr. Balyasny may be deemed to beneficially own the 4,861,355 Shares of the Companys Common Stock beneficially owned by BAM.

(b) Percent of Class:

5.32%

(c) Number of Shares as to which person has:
(i) Sole power to vote or to direct vote:

4,861,355

(ii) Shared power to vote or to direct vote:

None

(iii) Sole power to dispose or direct disposition of:

4,861,355

(iv) Shared power to dispose or to direct disposition of:

None

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

Applicable

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Page 35 of 37 SEC Filing

Item 6 Ownership of More than Five Percent on Behalf of Another Person:

Not Applicable

Item 7 Identification and Classification of the Subsidiary Which Acquired 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 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.

Page 35 of 37 Pages

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Page 36 of 37 SEC Filing

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: February 12, 2016

ATLAS MASTER FUND, LTD. ATLAS GLOBAL, LLC
By: /s/ Scott Schroeder By: /s/ Scott Schroeder
Scott Schroeder Scott Schroeder
Authorized Signatory Authorized Signatory
ATLAS GLOBAL INVESTMENTS, LTD. ATLAS INSTITUTIONAL FUND, LLC
By: /s/ Scott Schroeder By: /s/ Scott Schroeder
Scott Schroeder Scott Schroeder
Authorized Signatory Authorized Signatory
ATLAS INSTITUTIONAL FUND, LTD. ATLAS INSTITUTIONAL FUND II, LLC
By: /s/ Scott Schroeder By: /s/ Scott Schroeder
Scott Schroeder Scott Schroeder
Authorized Signatory Authorized Signatory
ATLAS INSTITUTIONAL FUND II, LTD. ATLAS GLOBAL JAPAN UNIT TRUST
By: /s/ Scott Schroeder By: /s/ Scott Schroeder
Scott Schroeder Scott Schroeder
Authorized Signatory Authorized Representative

Page 36 of 37 Pages

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Page 37 of 37 SEC Filing

ATLAS ENHANCED MASTER FUND, LTD. ATLAS ENHANCED FUND, L.P.
By: /s/ Scott Schroeder By: /s/ Scott Schroeder
Scott Schroeder Scott Schroeder
Authorized Signatory Authorized Signatory
ATLAS ENHANCED FUND, LTD. ATLAS FUNDAMENTAL TRADING MASTER FUND, LTD.
By: /s/ Scott Schroeder By: /s/ Scott Schroeder
Scott Schroeder Scott Schroeder
Authorized Signatory Authorized Signatory
ATLAS FUNDAMENTAL TRADING FUND, LP. ATLAS FUNDAMENTAL TRADING FUND, LTD.
By: /s/ Scott Schroeder By: /s/ Scott Schroeder
Scott Schroeder Scott Schroeder
Authorized Signatory Authorized Signatory
LYXOR/BALYASNY ATLAS ENHANCED FUND LIMITED ATLAS QUANTITATIVE TRADING FUND, LTD
By: /s/ Scott Schroeder By: /s/ Scott Schroeder
Scott Schroeder Scott Schroeder
Authorized Representative Authorized Signatory
BALYASNY ASSET MANAGEMENT L.P. DMITRY BALYASNY
By: /s/ Scott Schroeder By: /s/ Scott Schroeder
Scott Schroeder Scott Schroeder
Authorized Signatory Authorized Representative

Page 37 of 37 Pages

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