13D Filing: Southeastern Asset Management and Sonic Corp (SONC)

Page 3 of 4 – SEC Filing

CUSIP No. 835451105 13D
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(1) NAMES OF REPORTING PERSONS
O. Mason Hawkins I.D. No. XXX-XX-XXXX
___________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
(a)
(b) X
___________________________________________________________________
(3) SEC USE ONLY
___________________________________________________________________
(4) SOURCE OF FUNDS
OO: None
___________________________________________________________________
(5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) [ ]
___________________________________________________________________
(6) CITIZENSHIP OR PLACE OF ORGANIZATION
Citizen of United States
___________________________________________________________________
: (7) SOLE VOTING POWER
: (Discretionary Accounts)
NUMBER OF SHARES BENEFICIALLY : None
OWNED BY EACH REPORTING PERSON ________________________________
WITH : (8) SHARED VOTING POWER

: None
________________________________
: (9) SOLE DISPOSITIVE POWER

: None
________________________________
: (10) SHARED DISPOSITIVE POWER

: None
___________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

None (See Item 2)
___________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES
CERTAIN SHARES
___________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
0.0%
___________________________________________________________________
(14) TYPE OF REPORTING PERSON
IN
___________________________________________________________________

Item 5. Interest In Securities Of The Issuer

(a) The aggregate number and percentage of Securities to which this
Schedule 13D relates is 6,436,879 shares of the common stock of the Issuer,
constituting approximately 17.3% of the 37,154,893 shares outstanding.

Common % of outstanding
Shares Common Shares
Held
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Voting Authority

Sole: 0 0.0%
Shared: 6,370,000* 17.1%
None: 66,879 0.2%

Total 6,436,879 17.3%

*Consists of shares owned by Longleaf Partners Small-Cap Fund, a series of
Longleaf Partners Funds Trust, an open-end management investment company
registered under the Investment Company Act of 1940.

Dispositive Authority

Sole: 66,879 0.2%
Shared: 6,370,000* 17.1%

Total 6,436,879 17.3%

*Consists of shares owned by Longleaf Partners Small-Cap Fund, a series of
Longleaf Partners Funds Trust, an open-end management investment company
registered under the Investment Company Act of 1940.

(b) Southeastern generally has the sole power to dispose of or to
direct the disposition of the Securities held for discretionary accounts of its
investment clients, and may be granted the sole power to vote or direct the
vote of such Securities; such powers may be retained by or shared with the
respective clients for shared or non-discretionary accounts. Shares held by
any Series of Longleaf Partners Funds Trust are reported in the “shared”
category.

(c) There have been no purchase or sale transactions in the
Securities during the past sixty days.

(d) The investment advisory clients of Southeastern have the sole
right to receive and, subject to notice, to withdraw the proceeds from the sale
of the Securities, and the sole power to direct the receipt of dividends from
any of the Securities held for their respective accounts. Such clients may
also terminate the investment advisory agreements without penalty upon
appropriate notice. Southeastern does not have an economic interest in any of
the Securities reported herein.

(e) Not applicable.

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