SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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Rule 13d-1(b)

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Rule 13d-1(c)

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Rule 13d-1(d)

Item 1.

(a)

Name of Issuer
Radioshack Corporation

(b)

Address of Issuer’s Principal Executive Offices
Mail Stop CF3-201
300 Radioshack Circle
Fort Worth, TX 76102

Item 2(a).

Name of Person Filing
This statement is filed by the entities listed below, who are collectively referred to herein as “Reporting Persons,” with respect to the shares of Common Stock, $1 par value, per share of the Company (the “Shares”).

(i)  G1 Execution Services, LLC
(ii) Susquehanna Securities

Item 2(b).

Address of Principal Business Office or, if none, Residence

The address of the principal business office of G1 Execution Services, LLC is:

440 S. LaSalle Street
Suite 3030
Chicago, IL  60605

The address of the principal business office of Susquehanna Securities is:

401 E. City Avenue
Suite 220
Bala Cynwyd, PA 19004

Item 2(c).

Citizenship
Citizenship is set forth in Row 4 of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person.

Item 2(d).

Title of Class of Securities
Common Stock, $1 par value per share

Item 2(e)

CUSIP Number
750438103

Item 3.

If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

(a)

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Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b)

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Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c)

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Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d)

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Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e)

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An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

(f)

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An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);

(g)

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A parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G);

(h)

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A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)

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A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j)

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A non-U.S. institution in accordance with § 240.13d–1(b)(1)(ii)(J);

(k)

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Group, in accordance with rule 13d–1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with § 240.13d–1(b)(1)(ii)(J), please specify the type of institution:____________________________

Item 4.

Ownership

Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

The information required by Items 4(a) — (c) is set forth in Rows 5 — 11 of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person. The amount beneficially owned by Susquehanna Securities includes options to buy 6,130,900 shares of the Company’s Common Stock.  The Company’s quarterly report, on Form 10-Q, filed with the United States Securities and Exchange Commission on December 11, 2014, indicates that there were 100,702,386 shares of Common Stock outstanding as of November 30, 2014.

Item 5.

Ownership of Five Percent or Less of a Class

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following :  o

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 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.

G1 EXECUTION SERVICES, LLC

By:

/s/ Brian Sopinsky

Name:

Brian Sopinsky

Title:

Secretary

SUSQUEHANNA SECURITIES

By:

/s/ Brian Sopinsky

Name:

Brian Sopinsky

Title:

Secretary