13D Filing: Leucadia National and Fiesta Restaurant Group Inc. (FRGI)

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Item 1. Security and Issuer.

This statement on Schedule 13D relates to the Common Stock, par value $0.01 per share (the Common Stock), of Fiesta Restaurant Group, Inc.,
a Delaware corporation (the Issuer). The principal executive offices of the Issuer are located at 14800 Landmark Boulevard, Suite 500, Dallas, Texas 75254.

Item 2. Identity and Background.

This Schedule 13D
is being filed by Leucadia National Corporation, a New York corporation (Leucadia), on behalf of itself and its controlled subsidiaries (the Reporting Person). Leucadia is a diversified holding company engaged
through its consolidated subsidiaries in a variety of businesses, including investment banking and capital markets, beef processing, manufacturing, oil and gas exploration and production and asset management. Leucadia also owns investments in
business that engage in diversified holdings, real estate, commercial mortgage banking and servicing, telecommunication services in Italy, automobile dealerships and development of a gold and silver mining project.

The address of the principal office of the Reporting Person is 520 Madison Ave., New York, NY 10022.

The names of Leucadias directors and executive officers (the Scheduled Persons) are provided on Schedule I.

During the last five years, neither the Reporting Person nor, to the knowledge of the Reporting Person, any of the Scheduled Persons, has (i) been
convicted in any criminal proceeding (excluding traffic violations or similar misdemeanors) or (ii) been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction such that, as a result of such proceeding,
such person was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activity subject to, federal or state securities laws or finding any violation with respect to such laws.

Item 3. Source and Amount of Funds or Other Consideration.

From March 1, 2017 through June 9, 2017, the Reporting Person purchased an aggregate of 1,356,295 shares of Common Stock. The securities were
acquired by the Reporting Person using cash from working capital in the amount of approximately $28 million.

Item 4. Purpose of Transaction.

The Reporting Person purchased the Common Stock reported herein for investment purposes. The Reporting Person intends to purchase additional shares of
Common Stock from time to time, if, at such time, the terms of such investment are favorable to the Reporting Person and the Reporting Person deems the investment to be prudent.

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