13G Filing: Citadel Investment Group and Peabody Energy Corp (BTU)

Check the appropriate box to designate
the rule pursuant to which this Schedule is filed:

*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).

_________________

Peabody Energy Corporation

701 Market Street, St. Louis, Missouri 63101-1826

This Schedule 13G is being jointly
filed by Citadel Advisors LLC (“Citadel Advisors”), Citadel Advisors Holdings II LP (“CAH2”), Citadel GP
LLC (“CGP”) and Mr. Kenneth Griffin (collectively with Citadel Advisors, CAH2 and CGP, the “Reporting Persons”)
with respect to shares of common stock (and options to purchase common stock) of the above-named issuer owned by Citadel Global
Equities Master Fund Ltd., a Cayman Islands limited company (“CG”), Surveyor Capital Ltd., a Cayman Islands limited
company (“SC”), and Citadel Securities LLC, a Delaware limited liability company (“Citadel Securities”).

Citadel Advisors is the portfolio
manager for CG and SC. CAH2 is the managing member of Citadel Advisors. CALC III LP, a Delaware limited partnership (“CALC3”),
is the non-member manager of Citadel Securities. CGP is the general partner of CALC3 and CAH2. Mr. Griffin is the President and
Chief Executive Officer of, and owns a controlling interest in, CGP.

The filing of this statement shall
not be construed as an admission that any of the Reporting Persons is the beneficial owner of any securities covered by the statement
other than the securities actually owned by such person (if any).

The address of the principal business
office of each of the Reporting Persons is c/o Citadel LLC, 131 S. Dearborn Street, 32nd Floor, Chicago, Illinois 60603.

Each of Citadel Advisors and CGP
is organized as a limited liability company under the laws of the State of Delaware. CAH2 is organized as a limited partnership
under the laws of the State of Delaware. Mr. Griffin is a U.S. citizen.

Common stock, $0.01 par value

704549104

(a) [__] Broker
or dealer registered under Section 15 of the Exchange Act;

(b) [__] Bank
as defined in Section 3(a)(6) of the Exchange Act;

(c) [__] Insurance
company as defined in Section 3(a)(19) of the Exchange Act;

(d) [__] Investment
company registered under Section 8 of the Investment Company Act;

(e) [__] An
investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

(f) [__] An
employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);

(g) [__] A
parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G);

(h) [__] A
savings association as defined in Section 3(b) of the Federal Deposit Insurance Act;

(i) [__] A
church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act;

(j) [__] Group,
in accordance with Rule 13d-1(b)(1)(ii)(J).

If filing as
a non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J), please specify the type of institution: ____________.

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 5 percent of the class of securities,
check the following [X].

Not Applicable

See Item 2 above

Not Applicable

Not Applicable

By signing below I certify that,
to the best of my knowledge and belief, the securities referred to above 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.

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

Dated this 8^th day of March, 2016.

___________________________________

EXHIBIT 99.1

JOINT FILING AGREEMENT

The undersigned hereby agree that the Statement
on Schedule 13G filed herewith (and any amendments thereto), relating to the common stock of Peabody Energy Corporation, a Delaware
corporation, is being filed jointly with the Securities and Exchange Commission pursuant to Rule 13d-1(c) under the Securities
Exchange Act of 1934, as amended, on behalf of each of the undersigned.

This Agreement may be executed in counterparts
and each of such counterparts taken together shall constitute one and the same instrument.

Dated this 8^th day of March, 2016.

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