SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549


SCHEDULE 13D
(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
RULE 13d-2(a)

Under the Securities Exchange Act of 1934
(Amendment No. 4)*

Longs Drug Stores Corp.

(Name of Issuer)

Common Stock, par value $0.50 per share

(Title of Class of Securities)

543162101

(CUSIP Number)

Brien M. O'Brien, Chairman and CEO
Advisory Research, Inc.
180 North Stetson, Suite 5500
Chicago, Illinois 60601
(312) 565-1414

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

October 22, 2008

(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. [ ]

NOTE: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent.

(Continued on following pages)

(Page 1 of 12 Pages)

* 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 disclosures provided in a prior cover page.

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. 543162101 SCHEDULE 13D PAGE 2 OF 12 PAGES
------------------------------ ---------------------

--------------------------------------------------------------------------------
 1 NAME OF REPORTING PERSON


 ADVISORY RESEARCH, INC.
--------------------------------------------------------------------------------
 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X]
 (b) [ ]

--------------------------------------------------------------------------------
 3 SEC USE ONLY

--------------------------------------------------------------------------------
 4 SOURCE OF FUNDS*

 OO
--------------------------------------------------------------------------------
 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 TO ITEMS 2(d) or 2(e) [ ]

--------------------------------------------------------------------------------
 6 CITIZENSHIP OR PLACE OF ORGANIZATION

 DELAWARE
--------------------------------------------------------------------------------
 7 SOLE VOTING POWER

 -0-
 ----------------------------------------------------------
 NUMBER OF 8 SHARED VOTING POWER
 SHARES
BENEFICIALLY -0-
 OWNED BY ----------------------------------------------------------
 EACH 9 SOLE DISPOSITIVE POWER
 REPORTING
PERSON WITH -0-
 ----------------------------------------------------------
 10 SHARED DISPOSITIVE POWER

 -0-
--------------------------------------------------------------------------------
 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

 -0-
--------------------------------------------------------------------------------
 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
 CERTAIN SHARES*
 [ ]
--------------------------------------------------------------------------------
 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

 0.0% (1)
--------------------------------------------------------------------------------
 14 TYPE OF REPORTING PERSON*

 IA
--------------------------------------------------------------------------------
 * SEE INSTRUCTIONS

(1) Based on 36,007,597 outstanding shares of the common stock of the Company,
as reported in the Company's Schedule 14D9, filed with the Securities and
Exchange Commission on August 18, 2008.


------------------------------ ---------------------
CUSIP NO. 543162101 SCHEDULE 13D PAGE 3 OF 12 PAGES
------------------------------ ---------------------

--------------------------------------------------------------------------------
 1 NAME OF REPORTING PERSON


 ADVISORY RESEARCH SMALL CAP EQUITY FUND, L.P.
--------------------------------------------------------------------------------
 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X]
 (b) [ ]

--------------------------------------------------------------------------------
 3 SEC USE ONLY

--------------------------------------------------------------------------------
 4 SOURCE OF FUNDS*

 OO
--------------------------------------------------------------------------------
 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 TO ITEMS 2(d) or 2(e) [ ]

--------------------------------------------------------------------------------
 6 CITIZENSHIP OR PLACE OF ORGANIZATION

 ILLINOIS
--------------------------------------------------------------------------------
 7 SOLE VOTING POWER

 -0-
 ----------------------------------------------------------
 NUMBER OF 8 SHARED VOTING POWER
 SHARES
BENEFICIALLY -0-
 OWNED BY ----------------------------------------------------------
 EACH 9 SOLE DISPOSITIVE POWER
 REPORTING
PERSON WITH -0-
 ----------------------------------------------------------
 10 SHARED DISPOSITIVE POWER

 -0-
--------------------------------------------------------------------------------
 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

 -0-
--------------------------------------------------------------------------------
 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
 CERTAIN SHARES*
 [ ]
--------------------------------------------------------------------------------
 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

 0.0% (2)
--------------------------------------------------------------------------------
 14 TYPE OF REPORTING PERSON*

 PN
--------------------------------------------------------------------------------
 * SEE INSTRUCTIONS

(2) See footnote (1) above.

------------------------------ ---------------------

CUSIP NO. 543162101 SCHEDULE 13D PAGE 4 OF 12 PAGES
------------------------------ ---------------------

--------------------------------------------------------------------------------
 1 NAME OF REPORTING PERSON


 ADVISORY RESEARCH SMALL MID CAP VALUE EQUITY FUND, L.P.
--------------------------------------------------------------------------------
 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X]
 (b) [ ]

--------------------------------------------------------------------------------
 3 SEC USE ONLY

--------------------------------------------------------------------------------
 4 SOURCE OF FUNDS*

 OO
--------------------------------------------------------------------------------
 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 TO ITEMS 2(d) or 2(e) [ ]

--------------------------------------------------------------------------------
 6 CITIZENSHIP OR PLACE OF ORGANIZATION

 ILLINOIS
--------------------------------------------------------------------------------
 7 SOLE VOTING POWER

 -0-
 ----------------------------------------------------------
 NUMBER OF 8 SHARED VOTING POWER
 SHARES
BENEFICIALLY -0-
 OWNED BY ----------------------------------------------------------
 EACH 9 SOLE DISPOSITIVE POWER
 REPORTING
PERSON WITH -0-
 ----------------------------------------------------------
 10 SHARED DISPOSITIVE POWER

 -0-
--------------------------------------------------------------------------------
 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

 -0-
--------------------------------------------------------------------------------
 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
 CERTAIN SHARES*
 [ ]
--------------------------------------------------------------------------------
 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

 0.0% (3)
--------------------------------------------------------------------------------
 14 TYPE OF REPORTING PERSON*

 PN
--------------------------------------------------------------------------------
 * SEE INSTRUCTIONS

(3) See footnote (1) above.

------------------------------ ---------------------
CUSIP NO. 543162101 SCHEDULE 13D PAGE 5 OF 12 PAGES
------------------------------ ---------------------

--------------------------------------------------------------------------------
 1 NAME OF REPORTING PERSON


 ADVISORY RESEARCH SMALL CAP EQUITY FUND II, L.P.
--------------------------------------------------------------------------------
 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X]
 (b) [ ]

--------------------------------------------------------------------------------
 3 SEC USE ONLY

--------------------------------------------------------------------------------
 4 SOURCE OF FUNDS*

 OO
--------------------------------------------------------------------------------
 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 TO ITEMS 2(d) or 2(e) [ ]

--------------------------------------------------------------------------------
 6 CITIZENSHIP OR PLACE OF ORGANIZATION

 ILLINOIS
--------------------------------------------------------------------------------
 7 SOLE VOTING POWER

 -0-
 ----------------------------------------------------------
 NUMBER OF 8 SHARED VOTING POWER
 SHARES
BENEFICIALLY -0-
 OWNED BY ----------------------------------------------------------
 EACH 9 SOLE DISPOSITIVE POWER
 REPORTING
PERSON WITH -0-
 ----------------------------------------------------------
 10 SHARED DISPOSITIVE POWER

 -0-
--------------------------------------------------------------------------------
 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

 -0-
--------------------------------------------------------------------------------
 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
 CERTAIN SHARES*
 [ ]
--------------------------------------------------------------------------------
 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

 0.0% (4)
--------------------------------------------------------------------------------
 14 TYPE OF REPORTING PERSON*

 PN
--------------------------------------------------------------------------------
 * SEE INSTRUCTIONS

(4) See footnote (1) above.

------------------------------ ---------------------

CUSIP NO. 543162101 SCHEDULE 13D PAGE 6 OF 12 PAGES
------------------------------ ---------------------

--------------------------------------------------------------------------------
 1 NAME OF REPORTING PERSON


 ADVISORY RESEARCH SMALL MID CAP VALUE EQUITY FUND II, L.P.
--------------------------------------------------------------------------------
 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X]
 (b) [ ]

--------------------------------------------------------------------------------
 3 SEC USE ONLY

--------------------------------------------------------------------------------
 4 SOURCE OF FUNDS*

 OO
--------------------------------------------------------------------------------
 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 TO ITEMS 2(d) or 2(e) [ ]

--------------------------------------------------------------------------------
 6 CITIZENSHIP OR PLACE OF ORGANIZATION

 ILLINOIS
--------------------------------------------------------------------------------
 7 SOLE VOTING POWER

 -0-
 ----------------------------------------------------------
 NUMBER OF 8 SHARED VOTING POWER
 SHARES
BENEFICIALLY -0-
 OWNED BY ----------------------------------------------------------
 EACH 9 SOLE DISPOSITIVE POWER
 REPORTING
PERSON WITH -0-
 ----------------------------------------------------------
 10 SHARED DISPOSITIVE POWER

 -0-
--------------------------------------------------------------------------------
 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

 -0-
--------------------------------------------------------------------------------
 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
 CERTAIN SHARES*
 [ ]
--------------------------------------------------------------------------------
 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

 0.0% (5)
--------------------------------------------------------------------------------
 14 TYPE OF REPORTING PERSON*

 PN
--------------------------------------------------------------------------------
 * SEE INSTRUCTIONS

(5) See footnote (1) above.

------------------------------ ---------------------

CUSIP NO. 543162101 SCHEDULE 13D PAGE 7 OF 12 PAGES
------------------------------ ---------------------

--------------------------------------------------------------------------------
 1 NAME OF REPORTING PERSON


 ADVISORY RESEARCH ALL CAP FUND, L.P.
--------------------------------------------------------------------------------
 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X]
 (b) [ ]

--------------------------------------------------------------------------------
 3 SEC USE ONLY

--------------------------------------------------------------------------------
 4 SOURCE OF FUNDS*

 OO
--------------------------------------------------------------------------------
 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 TO ITEMS 2(d) or 2(e) [ ]

--------------------------------------------------------------------------------
 6 CITIZENSHIP OR PLACE OF ORGANIZATION

 ILLINOIS
--------------------------------------------------------------------------------
 7 SOLE VOTING POWER

 -0-
 ----------------------------------------------------------
 NUMBER OF 8 SHARED VOTING POWER
 SHARES
BENEFICIALLY -0-
 OWNED BY ----------------------------------------------------------
 EACH 9 SOLE DISPOSITIVE POWER
 REPORTING
PERSON WITH -0-
 ----------------------------------------------------------
 10 SHARED DISPOSITIVE POWER

 -0-
--------------------------------------------------------------------------------
 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

 -0-
--------------------------------------------------------------------------------
 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
 CERTAIN SHARES*
 [ ]
--------------------------------------------------------------------------------
 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

 0.0% (6)
--------------------------------------------------------------------------------
 14 TYPE OF REPORTING PERSON*

 PN
--------------------------------------------------------------------------------
 * SEE INSTRUCTIONS

(6) See footnote (1) above.

------------------------------ ---------------------

CUSIP NO. 543162101 SCHEDULE 13D PAGE 8 OF 12 PAGES
------------------------------ ---------------------
--------------------------------------------------------------------------------
 1 NAME OF REPORTING PERSON


 ADVISORY RESEARCH GLOBAL ALL CAP FUND, L.P.
--------------------------------------------------------------------------------
 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X]
 (b) [ ]

--------------------------------------------------------------------------------
 3 SEC USE ONLY

--------------------------------------------------------------------------------
 4 SOURCE OF FUNDS*

 OO
--------------------------------------------------------------------------------
 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 TO ITEMS 2(d) or 2(e) [ ]

--------------------------------------------------------------------------------
 6 CITIZENSHIP OR PLACE OF ORGANIZATION

 ILLINOIS
--------------------------------------------------------------------------------
 7 SOLE VOTING POWER

 -0-
 ----------------------------------------------------------
 NUMBER OF 8 SHARED VOTING POWER
 SHARES
BENEFICIALLY -0-
 OWNED BY ----------------------------------------------------------
 EACH 9 SOLE DISPOSITIVE POWER
 REPORTING
PERSON WITH -0-
 ----------------------------------------------------------
 10 SHARED DISPOSITIVE POWER

 -0-
--------------------------------------------------------------------------------
 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

 -0-
--------------------------------------------------------------------------------
 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
 CERTAIN SHARES*
 [ ]
--------------------------------------------------------------------------------
 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

 0.0% (7)
--------------------------------------------------------------------------------
 14 TYPE OF REPORTING PERSON*

 PN
--------------------------------------------------------------------------------
 * SEE INSTRUCTIONS

(7) See footnote (1) above.

------------------------------ ---------------------
CUSIP NO. 543162101 SCHEDULE 13D PAGE 9 OF 12 PAGES
------------------------------ ---------------------

ITEM 1. SECURITY AND ISSUER

 The Schedule 13D filed on August 20, 2008, amended on September 12,
2008, October 1,2008 and again on October 10, 2008 by Advisory Research, Inc.
("ARI"), a Delaware corporation, Advisory Research Small Cap Equity Fund, L.P.
("Advisory Small Cap"), Advisory Research Small Mid Cap Value Equity Fund, L.P.
("Advisory Small Mid Cap"), Advisory Research Small Cap Equity Fund II, L.P.
("Advisory Small Cap II"), Advisory Research Small Mid Cap Value Equity Fund
II, L.P. ("Advisory Small Mid Cap II"), Advisory Research All Cap Fund, L.P.
("Advisory All Cap"), and Advisory Research Global All Cap Fund, L.P. ("
Advisory Global All Cap") and along with ARI, the "Reporting Persons", with
respect to the common stock, par value $0.50 per share (the "Common Stock") of
Longs Drug Stores Corp. (the "Company"), Maryland corporation, is hereby amended
by this Amendment No. 4. Only those items hereby reported in this Amendment
No. 4 are amended and all other items remain unchanged.


ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

 Item 3. is hereby restated as follows:

 The source of the funds used to purchase the Common Stock was described
in previous filings of this Schedule 13D. It is no longer applicable, since all
Common Stock was tendered in the tender offer by Blue MergerSub Corp., an
indirect wholly owned subsidiary of CVS Caremark Corporation, to purchase all
outstanding Common Stock for $71.50 per share of Common Stock (the "Tender
Offer"). See Item 4.



------------------------------ ---------------------
CUSIP NO. 543162101 SCHEDULE 13D PAGE 10 OF 12 PAGES
------------------------------ ---------------------


ITEM 4. PURPOSE OF TRANSACTION.

Item 4 is hereby restated as follows:

All of the shares of Common Stock previously reported on this Schedule 13D were
tendered into the Tender Offer, and accepted for payment, except for 570 shares
sold in the open market. See Item 5 and Schedule A.

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER.

Paragraphs (a), (b) and (c) of Item 5 of the Schedule 13D are hereby
restated as follows:

 (a), (b) and (c) All of the shares of Common Stock previously
reported on this Schedule 13D were tendered into the Tender Offer, and accepted
for payment, except for 570 shares sold in the open market. ARI no longer has
any interest in any shares of Common Stock. See Schedule A.


ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
 RESPECT TO SECURITIES OF THE ISSUER.

 Except for ARI acting as investment advisor for its clients who own the
shares of Common Stock described herein, the Reporting Persons do not have any
contract, arrangement, understanding or relationship with any person with
respect to the securities of the Company.


--------------------------- -------------------
CUSIP NO. 543162101 SCHEDULE 13D PAGE 11 OF 12 PAGES
--------------------------- -------------------

 SIGNATURES

 After reasonable inquiry and to the best of his or its knowledge and
belief, the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Dated: October 27, 2008


 ADVISORY RESEARCH, INC.

 By: /s/ Brien M. O'Brien
 ---------------------------
 Name: Brien M. O'Brien
 Title: Chairman & CEO


 ADVISORY RESEARCH SMALL CAP EQUITY FUND, L.P.

 By: Advisory Research, Inc.,
 General Partner

 By: /s/ Brien M. O'Brien
 ---------------------------
 Name: Brien M. O'Brien
 Title: Chairman & CEO


 ADVISORY RESEARCH SMALL MID CAP VALUE EQUITY
 FUND, L.P.

 By: Advisory Research, Inc.,
 General Partner

 By: /s/ Brien M. O'Brien
 ---------------------------
 Name: Brien M. O'Brien
 Title: Chairman & CEO


 ADVISORY RESEARCH SMALL CAP EQUITY FUND II, L.P.

 By: Advisory Research, Inc.,
 General Partner

 By: /s/ Brien M. O'Brien
 ---------------------------
 Name: Brien M. O'Brien
 Title: Chairman & CEO


 ADVISORY RESEARCH SMALL MID CAP VALUE EQUITY
 FUND II, L.P.

 By: Advisory Research, Inc.,
 General Partner

 By: /s/ Brien M. O'Brien
 ---------------------------
 Name: Brien M. O'Brien
 Title: Chairman & CEO


 ADVISORY RESEARCH ALL CAP FUND, L.P.

 By: Advisory Research, Inc.,
 General Partner

 By: /s/ Brien M. O'Brien
 ---------------------------
 Name: Brien M. O'Brien
 Title: Chairman & CEO


 ADVISORY RESEARCH GLOBAL ALL CAP FUND, L.P.
 By: Advisory Research, Inc.,
 General Partner

 By: /s/ Brien M. O'Brien
 ---------------------------
 Name: Brien M. O'Brien
 Title: Chairman & CEO




--------------------------- -------------------
CUSIP NO. 543162101 SCHEDULE 13D PAGE 12 OF 12 PAGES
--------------------------- -------------------

 SCHEDULE A

Transactions in the shares by the Reporting Persons since October 10, 2008.
All of such transactions were effected in the open market, except as noted.
ARI effected its transactions in its capacity as an investment manager on
behalf of certain managed accounts.

ADVISORY RESEARCH, INC.


 Trade Date Shared Purchased (Sold) Price Per Share ($)
 ----------- ------------------------ -------------------
 10/11/2008 (340) $68.70
 10/16/2008 (230) $71.24
 10/22/2008 * (3,290,112) $71.50

* Each of the 3,290,112 shares held on behalf of certain managed accounts
described in previous filings of this Schedule 13D were tendered into the
tender offer by Blue MergerSub Corp., an indirect wholly owned subsidiary of
CVS Caremark Corporation, to purchase all outstanding shares of Common Stock
for $71.50 per share, and were accepted for payment.

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