SCHEDULE 13G
(Rule 13d-102)
Information to be Included in Statements Filed Pursuant
to Rule 13d-1(b), (c) and (d) and Amendments Thereto Filed
Pursuant to Rule 13d-2.
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
Under the Securities Exchange Act of 1934
(Amendment No. 1)*
Mariner Energy, Inc.
--------------------------------------------------------------------------------
(Name of Issuer)
Common Stock
--------------------------------------------------------------------------------
(Title of Class of Securities)
56845T305
-----------------------------
(CUSIP Number)
December 31, 2007
--------------------------------------------------------------------------------
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:
[X] 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. 56845T305 13G
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1 NAME OF REPORTING PERSON
Artisan Partners Limited Partnership
-------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(see Instructions) (a) [ ]
(b) [ ]
Not Applicable
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3 SEC USE ONLY
-------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
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5 SOLE VOTING POWER
None
NUMBER OF -----------------------------------------------------------------
SHARES 6 SHARED VOTING POWER
BENEFICIALLY
OWNED BY
EACH 4,899,336
REPORTING -----------------------------------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH
None
-----------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
5,174,032
-------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,174,032
-------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(see Instructions)
Not Applicable
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
5.9%
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12 TYPE OF REPORTING PERSON
(see Instructions)
IA
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Page 2 of 14
CUSIP No. 56845T305 13G
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1 NAME OF REPORTING PERSON
Artisan Investment Corporation
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(see Instructions) (a) [ ]
(b) [ ]
Not Applicable
-------------------------------------------------------------------------------
3 SEC USE ONLY
-------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
Wisconsin
-------------------------------------------------------------------------------
5 SOLE VOTING POWER
None
NUMBER OF -----------------------------------------------------------------
SHARES 6 SHARED VOTING POWER
BENEFICIALLY
OWNED BY
EACH 4,899,336
REPORTING -----------------------------------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH
None
-----------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
5,174,032
-------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,174,032
-------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(see Instructions)
Not Applicable
-------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
5.9%
-------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON
(see Instructions)
CO
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Page 3 of 14
CUSIP No. 56845T305 13G
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1 NAME OF REPORTING PERSON
ZFIC, Inc.
-------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(see Instructions) (a) [ ]
(b) [ ]
Not Applicable
-------------------------------------------------------------------------------
3 SEC USE ONLY
-------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
Wisconsin
-------------------------------------------------------------------------------
5 SOLE VOTING POWER
None
NUMBER OF -----------------------------------------------------------------
SHARES 6 SHARED VOTING POWER
BENEFICIALLY
OWNED BY
EACH 4,899,336
REPORTING -----------------------------------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH
None
-----------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
5,174,032
-------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,174,032
-------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(see Instructions)
Not Applicable
-------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
5.9%
-------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON
(see Instructions)
CO
-------------------------------------------------------------------------------
Page 4 of 14
CUSIP No. 56845T305 13G
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1 NAME OF REPORTING PERSON
Andrew A. Ziegler
-------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(see Instructions) (a) [ ]
(b) [ ]
Not Applicable
-------------------------------------------------------------------------------
3 SEC USE ONLY
-------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
U.S.A.
-------------------------------------------------------------------------------
5 SOLE VOTING POWER
None
NUMBER OF -----------------------------------------------------------------
SHARES 6 SHARED VOTING POWER
BENEFICIALLY
OWNED BY
EACH 4,899,336
REPORTING -----------------------------------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH
None
-----------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
5,174,032
-------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,174,032
-------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(see Instructions)
Not Applicable
-------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
5.9%
-------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON
(see Instructions)
IN
-------------------------------------------------------------------------------
Page 5 of 14
CUSIP No. 56845T305 13G
-------------------------------------------------------------------------------
1 NAME OF REPORTING PERSON
Carlene M. Ziegler
-------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(see Instructions) (a) [ ]
(b) [ ]
Not Applicable
-------------------------------------------------------------------------------
3 SEC USE ONLY
-------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
U.S.A.
-------------------------------------------------------------------------------
5 SOLE VOTING POWER
None
NUMBER OF -----------------------------------------------------------------
SHARES 6 SHARED VOTING POWER
BENEFICIALLY
OWNED BY
EACH 4,899,336
REPORTING -----------------------------------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH
None
-----------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
5,174,032
-------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,174,032
-------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(see Instructions)
Not Applicable
-------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
5.9%
-------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON
(see Instructions)
IN
-------------------------------------------------------------------------------
Page 6 of 14
Item 1(a) Name of Issuer:
Mariner Energy, Inc.
Item 1(b) Address of Issuer's Principal Executive Offices:
One BriarLake Plaza, Suite 2000
2000 West Sam Houston Parkway South
Houston, Texas 77042
Item 2(a) Name of Person Filing:
Artisan Partners Limited Partnership ("Artisan Partners")
Artisan Investment Corporation, the general partner of Artisan
Partners ("Artisan Corp.")
ZFIC, Inc., the sole stockholder of Artisan Corp. ("ZFIC")
Andrew A. Ziegler
Carlene M. Ziegler
Item 2(b) Address of Principal Business Office:
Artisan Partners, Artisan Corp., ZFIC, Mr. Ziegler and Ms.
Ziegler are all located at:
875 East Wisconsin Avenue, Suite 800
Milwaukee, WI 53202
Item 2(c) Citizenship:
Artisan Partners is a Delaware limited partnership
Artisan Corp. is a Wisconsin corporation
ZFIC is a Wisconsin corporation
Mr. Ziegler and Ms. Ziegler are U.S. citizens
Item 2(d) Title of Class of Securities:
Common Stock
Item 2(e) CUSIP Number:
56845T305
Item 3 Type of Person:
(e) Artisan Partners is an investment adviser registered under
section 203 of the Investment Advisers Act of 1940; Artisan
Corp. is the general partner of Artisan Partners; ZFIC is the
sole stockholder of Artisan Corp.; Mr. Ziegler and Ms. Ziegler
are the principal stockholders of ZFIC.
Page 7 of 14
Item 4 Ownership (at December 31, 2007):
(a) Amount owned "beneficially" within the meaning of rule
13d-3:
5,174,032
(b) Percent of class:
5.9% (based on 87,202,363 shares outstanding as of
November 9, 2007)
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: None
(ii) shared power to vote or to direct the vote:
4,899,336
(iii) sole power to dispose or to direct the disposition
of: None
(iv) shared power to dispose or to direct disposition
of: 5,174,032
Item 5 Ownership of Five Percent or Less of a Class:
Not applicable.
Item 6 Ownership of More than Five Percent on Behalf of Another Person:
The shares reported herein have been acquired on behalf of
discretionary clients of Artisan Partners. Persons other than
Artisan Partners are entitled to receive all dividends from,
and proceeds from the sale of, those shares. None of those
persons, to the knowledge of Artisan Partners, Artisan Corp.,
ZFIC, Mr. Ziegler or Ms. Ziegler, has an economic interest in
more than 5% of the class.
Item 7 Identification and Classification of the Subsidiary Which Acquired
the Security Being Reported on by the Parent Holding Company or
Control Person:
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.
Page 8 of 14
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 13, 2008
ARTISAN INVESTMENT CORPORATION,
for itself and as the general partner of
ARTISAN PARTNERS LIMITED PARTNERSHIP
By: Janet D. Olsen*
-----------------------------------
ZFIC, INC.
By: Janet D. Olsen*
-------------------------------------
ANDREW A. ZIEGLER
Andrew A. Ziegler*
------------------------------------------
CARLENE M. ZIEGLER
Carlene M. Ziegler*
--------------------------------------
*By: /s/ Janet D. Olsen
-----------------------------------
Janet D. Olsen
Vice President of Artisan Investment
Corporation
Attorney-in-Fact for ZFIC, Inc.
Attorney-in-Fact for Andrew A.
Ziegler
Attorney-in-Fact for Carlene M.
Ziegler
Page 9 of 14
Exhibit Index
Exhibit 1 Joint Filing Agreement dated February 13, 2008 by and among
Artisan Partners Limited Partnership, Artisan Investment
Corporation, ZFIC, Inc., Andrew A. Ziegler and Carlene M. Ziegler
Exhibit 2 Power of Attorney of ZFIC, Inc., dated March 19, 2007
Exhibit 3 Power of Attorney of Andrew A. Ziegler dated March 19, 2007
Exhibit 4 Power of Attorney of Carlene M. Ziegler dated March 19, 2007
Page 10 of 14
EXHIBIT 1
JOINT FILING AGREEMENT
The undersigned hereby agree to the joint filing of the Schedule 13G to
which this Agreement is attached.
Dated: February 13, 2008
ARTISAN INVESTMENT CORPORATION,
for itself and as the general partner of
ARTISAN PARTNERS LIMITED PARTNERSHIP
By: Janet D. Olsen*
-----------------------------------
ZFIC, INC.
By: Janet D. Olsen*
-------------------------------------
ANDREW A. ZIEGLER
Andrew A. Ziegler*
--------------------------------------
CARLENE M. ZIEGLER
Carlene M. Ziegler*
--------------------------------------
*By: /s/ Janet D. Olsen
-----------------------------------
Janet D. Olsen
Vice President of Artisan Investment
Corporation
Attorney-in-Fact for ZFIC, Inc.
Attorney-in-Fact for Andrew A.
Ziegler
Attorney-in-Fact for Carlene M.
Ziegler
Page 11 of 14
EXHIBIT 2
POWER OF ATTORNEY
The undersigned, ZFIC, Inc., hereby appoints Lawrence A. Totsky, Janet D.
Olsen, and Sarah A. Johnson, and each of them individually, its true and lawful
attorney-in-fact and agent, with full power to execute and file with the United
States Securities and Exchange Commission and any stock exchange or similar
authority, for and on its behalf in any and all capacities, any and all reports
required to be filed pursuant to Section 13 of the Securities Exchange Act of
1934 and the rules thereunder, including but not limited to reports on Schedule
13D or 13G, any and all amendments to such reports, with all exhibits, and any
other forms or documents as may be necessary in connection with the filing of
such reports with the United States Securities and Exchange Commission and any
stock exchange or similar authority, granting unto said attorney full power and
authority to do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete, as fully as the
undersigned might or could do in person.
This Power of Attorney shall remain in full force and effect until revoked
by the undersigned in a signed writing delivered to the foregoing
attorneys-in-fact and agents.
IN WITNESS WHEREOF the undersigned has caused this Power of Attorney to be
executed this 19th day of March, 2007.
ZFIC, INC.
By: /s/ Andrew A. Ziegler
-------------------------------------
Andrew A. Ziegler
Vice President
STATE OF WISCONSIN )
) SS.
COUNTY OF MILWAUKEE )
I, Timothy K. Weston, a Notary Public in and for the County of Milwaukee,
State of Wisconsin, DO HEREBY CERTIFY that Andrew A. Ziegler, who is personally
known to me to be the same person whose name is subscribed to the foregoing
instrument, appeared before me this day in person and acknowledged that he
signed and delivered the said instrument as his own free and voluntary act, for
the uses and purposes therein set forth.
Given under my hand and notarial seal, this 19th day of March, 2007.
/s/ Timothy K. Weston
--------------------------------------
Notary Public
Page 12 of 14
EXHIBIT 3
POWER OF ATTORNEY
The undersigned, Andrew A. Ziegler, hereby appoints Lawrence A. Totsky,
Janet D. Olsen, and Sarah A. Johnson, and each of them individually, his true
and lawful attorney-in-fact and agent, with full power to execute and file with
the United States Securities and Exchange Commission and any stock exchange or
similar authority, for and on his behalf in any and all capacities, any and all
reports required to be filed pursuant to Section 13 of the Securities Exchange
Act of 1934 and the rules thereunder, including but not limited to reports on
Schedule 13D or 13G, any and all amendments to such reports, with all exhibits,
and any other forms or documents as may be necessary in connection with the
filing of such reports with the United States Securities and Exchange
Commission and any stock exchange or similar authority, granting unto said
attorney full power and authority to do and perform any and all acts for and on
behalf of the undersigned which may be necessary or desirable to complete, as
fully as the undersigned might or could do in person.
This Power of Attorney shall remain in full force and effect until revoked
by the undersigned in a signed writing delivered to the foregoing
attorneys-in-fact and agents.
IN WITNESS WHEREOF the undersigned has caused this Power of Attorney to be
executed this 19th day of March, 2007.
/s/ Andrew A. Ziegler
--------------------------------------
Andrew A. Ziegler
STATE OF WISCONSIN )
) SS.
COUNTY OF MILWAUKEE )
I, Timothy K. Weston, a Notary Public in and for the County of Milwaukee,
State of Wisconsin, DO HEREBY CERTIFY that Andrew A. Ziegler, who is personally
known to me to be the same person whose name is subscribed to the foregoing
instrument, appeared before me this day in person and acknowledged that he
signed and delivered the said instrument as his own free and voluntary act, for
the uses and purposes therein set forth.
Given under my hand and notarial seal, this 19th day of March, 2007.
/s/ Timothy K. Weston
--------------------------------------
Notary Public
Page 13 of 14
EXHIBIT 4
POWER OF ATTORNEY
The undersigned, Carlene M. Ziegler, hereby appoints Lawrence A. Totsky,
Janet D. Olsen, and Sarah A. Johnson, and each of them individually, her true
and lawful attorney-in-fact and agent, with full power to execute and file with
the United States Securities and Exchange Commission and any stock exchange or
similar authority, for and on her behalf in any and all capacities, any and all
reports required to be filed pursuant to Section 13 of the Securities Exchange
Act of 1934 and the rules thereunder, including but not limited to reports on
Schedule 13D or 13G, any and all amendments to such reports, with all exhibits,
and any other forms or documents as may be necessary in connection with the
filing of such reports with the United States Securities and Exchange
Commission and any stock exchange or similar authority, granting unto said
attorney full power and authority to do and perform any and all acts for and on
behalf of the undersigned which may be necessary or desirable to complete, as
fully as the undersigned might or could do in person.
This Power of Attorney shall remain in full force and effect until revoked
by the undersigned in a signed writing delivered to the foregoing
attorneys-in-fact and agents.
IN WITNESS WHEREOF the undersigned has caused this Power of Attorney to be
executed this 19th day of March, 2007.
/s/ Carlene M. Ziegler
--------------------------------------
Carlene M. Ziegler
STATE OF WISCONSIN )
) SS.
COUNTY OF MILWAUKEE )
I, Timothy K. Weston, a Notary Public in and for the County of Milwaukee,
State of Wisconsin, DO HEREBY CERTIFY that Carlene M. Ziegler, who is
personally known to me to be the same person whose name is subscribed to the
foregoing instrument, appeared before me this day in person and acknowledged
that she signed and delivered the said instrument as her own free and voluntary
act, for the uses and purposes therein set forth.
Given under my hand and notarial seal, this 19th day of March, 2007.
/s/ Timothy K. Weston
--------------------------------------
Notary Public
Page 14 of 14