Document:

Exhibit 4.2

 

THIRD SUPPLEMENTAL INDENTURE

 

Third Supplemental Indenture (this “Supplemental
Indenture”), dated as of January 28, 2022, among CF Industries, Inc., a Delaware corporation (the “Company”),
CF Industries Holdings, Inc., a Delaware corporation (“CFIH”), and Wells Fargo Bank, National Association, a national
banking association duly incorporated and existing under the laws of the United States of America, as trustee (the “Trustee”)
and as collateral agent (the “Collateral Agent”).

 

W I T N E S S E T H

 

WHEREAS, the Company, CFIH, the Trustee and the
Collateral Agent are parties to an Indenture, dated as of November 21, 2016 (as amended and supplemented prior to the effectiveness
of this Supplemental Indenture, the “Indenture”), providing for the issuance of the Company’s 4.500% Senior Secured
Notes due 2026 (the “Notes”) and the guarantee thereof by CFIH;

 

WHEREAS, Section 9.02 of the Indenture provides,
among other things, that the Notes and the Indenture may be amended with the consent of the Holders of at least a majority in aggregate
principal amount of the outstanding Notes;

 

WHEREAS, the Company distributed a consent solicitation
statement, dated January 19, 2022 (the “Consent Solicitation Statement”), to solicit consents (the “Consent
Solicitation”) from the Holders to certain amendments to the Indenture and the Notes (the “Amendments”);

 

WHEREAS, Holders of at least a majority in aggregate
principal amount of the outstanding Notes have given and, as of the date hereof, have not withdrawn their consent to the Amendments;

 

WHEREAS, the Company has filed with the Trustee,
pursuant to Section 9.02 of the Indenture, evidence satisfactory to the Trustee of such consent; and

 

WHEREAS, the Company, pursuant to Section 9.02
of the Indenture has requested that the Trustee and the Collateral Agent join with the Company and CFIH in the execution of this Supplemental
Indenture and, in accordance with Sections 9.02, 9.06 and 13.03 of the Indenture, has delivered to the Trustee and the Collateral
Agent an Officers’ Certificate, an Opinion of Counsel and resolutions of its Board of Directors authorizing the execution of this
Supplemental Indenture; this Supplemental Indenture will not result in a material modification of the Notes for Foreign Account Tax Compliance
Act purposes; and the Company, CFIH, the Trustee and the Collateral Agent are authorized to execute and deliver this Supplemental Indenture.

 

NOW THEREFORE, in consideration of the foregoing
and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties hereto mutually covenant and agree
for the equal and ratable benefit of the Holders of the Notes as follows:

 

1.       Defined
Terms. Capitalized terms used but not defined herein have the meanings ascribed to such terms in the Indenture.

 

     

     

    

 

2.       Amendments.

 

(a)       Section 1.02
of the Indenture is hereby amended by adding the following definition of the term UK Entities as a new paragraph immediately after
the paragraph consisting of the definition of the term Trustee and immediately before the paragraph consisting of the definition
of the term Uniform Commercial Code:

 

“UK Entities” means
CF Industries (UK) Limited, a company incorporated in England & Wales, and CF Fertilisers UK Limited, a company incorporated in England
& Wales, each of their respective subsidiaries and, in each case, any and all successors thereto (each of the foregoing a “UK
Entity”).

 

(b)       The
definition of the term Significant Subsidiary in Section 1.02 of the Indenture is hereby amended in its entirety to read as
follows:

 

“Significant Subsidiary”
means any Subsidiary that would be a “significant subsidiary” as defined in Article 1, Rule 1-02 of Regulation S-X,
promulgated pursuant to the Securities Act, as such Regulation is in effect on the Issue Date; provided that each UK Entity will
be deemed not to be a Significant Subsidiary, and each UK Entity will be deemed not to be a Subsidiary for purposes of determining whether
any group of Subsidiaries would, taken together, constitute a Significant Subsidiary.

 

(c)       The
first sentence of paragraph (4) of the back of note of the Notes is hereby amended in its entirety to read as follows:

 

The Company issued the Notes under an indenture, dated as of
November 21, 2016 (as amended and supplemented from time to time, the “Indenture”), among the Company, the Guarantors,
the Trustee and the Collateral Agent.

 

(d)       The
first sentence of paragraph (4) of the back of note of the form of note in Exhibit A to the Indenture is hereby amended in its
entirety to read as follows:

 

The Company issued the Notes under an indenture, dated as of
November 21, 2016 (as amended and supplemented from time to time, the “Indenture”), among the Company, the Guarantors,
the Trustee and the Collateral Agent.

 

3.       Effectiveness.
Holders of at least a majority in aggregate principal amount of the Notes outstanding have given and, as of the date hereof, have
not withdrawn their consent to the Amendments. This Supplemental Indenture shall become effective upon its execution and delivery by
the parties hereto. Notwithstanding the foregoing, the amendments set forth in Section 2 of this Supplemental Indenture shall
become operative only when consents representing at least a majority of the then aggregate outstanding principal amount of the Notes
are accepted pursuant to the Consent Solicitation and the Company pays the consent fee payable pursuant to the Consent Solicitation.
If, after the date hereof, the Consent Solicitation is terminated or withdrawn or the other conditions set forth in this
Section 3 are not satisfied (a) the amendments set forth in Section 2 of this Supplemental Indenture shall have no
effect, (b) the Indenture shall be deemed to be amended so that it reads the same as it did immediately prior to the date
hereof and (c) this Supplemental Indenture shall be deemed null and void. The Company shall provide prompt written notice to
the Trustee if the consent fee payable pursuant to the Consent Solicitation has been paid and the amendments set forth in
Section 2 of this Supplemental Indenture have become operative, or if the consent fee payable pursuant to the Consent
Solicitation shall not be paid and the amendments set forth in Section 2 of this Supplemental Indenture shall not become
operative. Any failure of the Company to provide such notice promptly or at all, or any defect in such notice, shall not in any way
impair or affect the validity or effectiveness of this Supplemental Indenture or the operative status of the amendments set forth in
Section 2 of this Supplemental Indenture and shall not constitute a Default or Event of Default.

 

    2

     

    

 

4.       Successors.
All agreements of the Company and CFIH in this Supplemental Indenture will bind their respective successors. All agreements of the Trustee
and the Collateral Agent in this Supplemental Indenture will bind their respective successors.

 

5.       Severability.
In case any provision in this Supplemental Indenture is invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions will not in any way be affected or impaired thereby, and such provision shall be ineffective only to the extent
of such invalidity, illegality or unenforceability.

 

6.       Governing
Law. THE INTERNAL LAW OF THE STATE OF NEW YORK WILL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE WITHOUT GIVING EFFECT
TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED
THEREBY.

 

EACH PARTY HERETO, AND EACH HOLDER OF A NOTE
BY ACCEPTANCE THEREOF, HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN RESPECT
OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS SUPPLEMENTAL INDENTURE.

 

7.       Counterparts;
Electronic Signatures. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy will be an
original, but all of them together represent the same agreement. The exchange of copies of this Supplemental Indenture and of
signature pages by facsimile or PDF transmission shall constitute effective execution and delivery of this Supplemental Indenture as
to the parties hereto and may be used in lieu of the original of this Supplemental Indenture for all purposes. Signatures of the
parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. This Supplemental
Indenture and any certificate, agreement or other document to be signed in connection with this Supplemental Indenture and the
transactions contemplated hereby shall be valid, binding, and enforceable against a party when executed and delivered by an
authorized individual on behalf of the party by means of (i) an original manual signature; (ii) a faxed, scanned, or
photocopied manual signature or (iii) any other electronic signature permitted by the federal Electronic Signatures in Global
and National Commerce Act, state enactments of the Uniform Electronic Transactions Act and/or any other relevant electronic
signatures law, including any relevant provisions of the Uniform Commercial Code (collectively, “Signature Law”),
in each case to the extent applicable. Each faxed, scanned or photocopied manual signature, or other electronic signature, shall for
all purposes have the same validity, legal effect, and admissibility in evidence as an original manual signature. Each party hereto
shall be entitled to conclusively rely upon, and shall have no liability with respect to, any faxed, scanned or photocopied manual
signature, or other electronic signature, of any other party and shall have no duty to investigate, confirm or otherwise verify the
validity or authenticity thereof. This Supplemental Indenture may be executed in any number of counterparts, each of which shall be
deemed to be an original, but such counterparts shall, together, constitute one and the same instrument. For the avoidance of doubt,
original manual signatures shall be used for execution or indorsement of writings when required under the Uniform Commercial Code or
other Signature Law due to the character or intended character of the writings.

 

    3

     

    

 

8.       Effect
of Headings. The section headings herein have been inserted for convenience of reference only, are not to be considered a part of
this Supplemental Indenture and will in no way modify or restrict any of the terms or provisions of this Supplemental Indenture.

 

9.       Indenture
Remains in Full Force and Effect. This Supplemental Indenture shall form a part of the Indenture for all purposes and, except as supplemented
or amended hereby, all other provisions in the Indenture and the Notes, to the extent not inconsistent with the terms and provisions of
this Supplemental Indenture, shall remain in full force and effect.

 

10.       Concerning
the Trustee. The Trustee and the Collateral Agent make no representation as to and shall not be responsible in any manner whatsoever
for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein,
all of which recitals are made solely by the Company and CFIH, and the Trustee and the Collateral Agent assume no responsibility for the
same. The Trustee and the Collateral Agent make no representation as to and shall not be responsible in any manner whatsoever for or in
respect of the Consent Solicitation Statement, the Consent Solicitation or the consents of Holders. All of the provisions contained in
the Indenture in respect of the rights, powers, privileges, and immunities of the Trustee and the Collateral Agent shall be applicable
in respect of this Supplemental Indenture as fully and with like force and effect as though fully set forth in full herein. The Company
hereby confirms to the Trustee that this Supplemental Indenture has not resulted in a material modification of the Notes for Foreign Accounting
Tax Compliance Act purposes.

 

[Signature page follows.]

 

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IN WITNESS WHEREOF, the parties hereto have caused
this Supplemental Indenture to be duly executed, all as of the date first written above.

 

	 	CF INDUSTRIES, INC.
	 	 
	 	By:	/s/ Daniel L. Swenson
	 	 	Name:	Daniel L. Swenson
	 	 	Title:	Vice President, Treasurer, and Assistant Secretary
	 	 
	 	CF INDUSTRIES HOLDINGS, INC.
	 	 
	 	By:	/s/ Daniel L. Swenson
	 	 	Name:	Daniel L. Swenson
	 	 	Title:	Vice President, Treasurer, and Assistant Secretary

 

[Third
Supplemental Indenture – CF Industries, Inc. 4.500% Senior Secured Notes due 2026]

 

     

     

    

 

	 	WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee
	 	 	 
	 	By:	Computershare Trust Company, N.A., as agent and attorney-in-fact
	 	 	 
	 	By:	/s/ Linda Lopez
	 	 	Name:	Linda Lopez
	 	 	Title:	Assistant Vice President
	 	 
	 	WELLS FARGO BANK, NATIONAL ASSOCIATION, as Collateral Agent
	 	 	 
	 	By:	 Computershare Trust Company, N.A., as agent and attorney-in-fact
	 	 	 
	 	By:	/s/ Linda Lopez
	 	 	Name:	Linda Lopez
	 	 	Title:	Assistant Vice President

 

[Third
Supplemental Indenture – CF Industries, Inc. 4.500% Senior Secured Notes due 2026]Exhibit 4.3

 

FOURTH SUPPLEMENT TO THIRD SUPPLEMENTAL INDENTURE

 

FOURTH SUPPLEMENT, dated as of January 28,
2022 (this “Fourth Supplement”), among CF Industries, Inc., a Delaware corporation (the “Company”),
CF Industries Holdings, Inc., a Delaware corporation (“CFIH”), and Wells Fargo Bank, National Association, a national
banking association duly incorporated and existing under the laws of the United States of America, as trustee (the “Trustee”),
to the Third Supplemental Indenture, dated as of March 11, 2014 (as amended and supplemented prior to the effectiveness of this Fourth
Supplement, the “Supplemental Indenture”), relating to the 5.150% Senior Notes due 2034 of the Company (the “Notes”).

 

W I T N E S S E T H

 

WHEREAS, the Company, CFIH and the Trustee are
parties to an Indenture, dated as of May 23, 2013 (the “Base Indenture”), providing for the issuance from time
to time of one or more series of the Company’s debt securities and guarantees thereof by CFIH;

 

WHEREAS, the Company, CFIH and the Trustee are
parties to the Supplemental Indenture, entered into pursuant to the Base Indenture, which established and provided for the issuance of
the Notes and the guarantee thereof by CFIH;

 

WHEREAS, Section 9.02 of the Supplemental Indenture
provides, among other things, that the Notes and the Indenture may be amended with the consent of the Holders of at least a majority in
aggregate principal amount of the outstanding Notes;

 

WHEREAS, the Company distributed a consent solicitation
statement, dated January 19, 2022 (the “Consent Solicitation Statement”), to solicit consents (the “Consent
Solicitation”) from the Holders to certain amendments to the Supplemental Indenture and the Notes (the “Amendments”);

 

WHEREAS, Holders of at least a majority in aggregate
principal amount of the outstanding Notes have given and, as of the date hereof, have not withdrawn their consent to the Amendments;

 

WHEREAS, the Company has filed with the Trustee,
pursuant to Section 9.02 of the Supplemental Indenture, evidence satisfactory to the Trustee of such consent; and

 

WHEREAS, the Company, pursuant to Section 9.02
of the Supplemental Indenture has requested that the Trustee join with the Company and CFIH in the execution of this Fourth Supplement
and, in accordance with Sections 9.02, 9.06 and 12.04 of the Supplemental Indenture, has delivered to the Trustee an Officers’
Certificate, an Opinion of Counsel and resolutions of its Board of Directors authorizing the execution of this Fourth Supplement; this
Fourth Supplement will not result in a material modification of the Notes for Foreign Account Tax Compliance Act purposes; and the Company,
CFIH and the Trustee are authorized to execute and deliver this Fourth Supplement.

 

NOW THEREFORE, in consideration of the foregoing
and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties hereto mutually covenant and agree
for the equal and ratable benefit of the Holders of the Notes as follows:

 

     

     

    

 

1.       Defined
Terms. Capitalized terms used but not defined herein have the meanings ascribed to such terms in the Supplemental Indenture.

 

2.       Amendments.

 

(a)     Section 1.02
of the Supplemental Indenture is hereby amended by adding the following definition of the term UK Entities as a new paragraph immediately
after the paragraph consisting of the definition of the term Trustee and immediately before the paragraph consisting of the definition
of the term Voting Stock:

 

“UK Entities” means
CF Industries (UK) Limited, a company incorporated in England & Wales, and CF Fertilisers UK Limited, a company incorporated in England
& Wales, each of their respective subsidiaries and, in each case, any and all successors thereto (each of the foregoing a “UK
Entity”).

 

(b)     The
definition of the term Significant Subsidiary in Section 1.02 of the Supplemental Indenture is hereby amended in its entirety
to read as follows:

 

“Significant Subsidiary”
means any Subsidiary that would be a “significant subsidiary” as defined in Article 1, Rule 1-02 of Regulation S-X,
promulgated pursuant to the Securities Act, as such Regulation is in effect on the Issue Date; provided that each UK Entity will
be deemed not to be a Significant Subsidiary, and each UK Entity will be deemed not to be a Subsidiary for purposes of determining whether
any group of Subsidiaries would, taken together, constitute a Significant Subsidiary.

 

(c)     The
first sentence of paragraph (4) of the back of note of the Notes is hereby amended in its entirety to read as follows:

 

The Company issued the Notes under an indenture, dated as of
May 23, 2013 (the “Base Indenture”), among the Company, CF Holdings and the Trustee, as supplemented by the Third
Supplemental Indenture, dated as of March 11, 2014 (as amended and supplemented from time to time, the “Supplemental Indenture”
and, together with the Base Indenture as so supplemented, the “Indenture”), among the Company, CF Holdings and the
Trustee.

 

(d)     The
first sentence of paragraph (4) of the back of note of the form of note in Exhibit A to the Supplemental Indenture is hereby
amended in its entirety to read as follows:

 

The Company issued the Notes under an indenture, dated as of
May 23, 2013 (the “Base Indenture”), among the Company, CF Holdings and the Trustee, as supplemented by the Third
Supplemental Indenture, dated as of March 11, 2014 (as amended and supplemented from time to time, the “Supplemental Indenture”
and, together with the Base Indenture as so supplemented, the “Indenture”), among the Company, CF Holdings and the
Trustee.

 

    2 

     

    

 

3.       Effectiveness.
Holders of at least a majority in aggregate principal amount of the Notes outstanding have given and, as of the date hereof, have not
withdrawn their consent to the Amendments. This Fourth Supplement shall become effective upon its execution and delivery by the parties
hereto. Notwithstanding the foregoing, the amendments set forth in Section 2 of this Fourth Supplement shall become operative only
when consents representing at least a majority of the then aggregate outstanding principal amount of the Notes are accepted pursuant to
the Consent Solicitation and the Company pays the consent fee payable pursuant to the Consent Solicitation. If, after the date hereof,
the Consent Solicitation is terminated or withdrawn or the other conditions set forth in this Section 3 are not satisfied (a) the
amendments set forth in Section 2 of this Fourth Supplement shall have no effect, (b) the Supplemental Indenture shall be deemed
to be amended so that it reads the same as it did immediately prior to the date hereof and (c) this Fourth Supplement shall be deemed
null and void. The Company shall provide prompt written notice to the Trustee if the consent fee payable pursuant to the Consent Solicitation
has been paid and the amendments set forth in Section 2 of this Fourth Supplement have become operative, or if the consent fee payable
pursuant to the Consent Solicitation shall not be paid and the amendments set forth in Section 2 of this Fourth Supplement shall
not become operative. Any failure of the Company to provide such notice promptly or at all, or any defect in such notice, shall not in
any way impair or affect the validity or effectiveness of this Fourth Supplement or the operative status of the amendments set forth in
Section 2 of this Fourth Supplement and shall not constitute a Default or Event of Default.

 

4.       Successors.
All agreements of the Company and CFIH in this Fourth Supplement will bind their respective successors. All agreements of the Trustee
in this Fourth Supplement will bind its successors.

 

5.       Severability.
In case any provision in this Fourth Supplement is invalid, illegal or unenforceable, the validity, legality and enforceability of the
remaining provisions will not in any way be affected or impaired thereby, and such provision shall be ineffective only to the extent of
such invalidity, illegality or unenforceability.

 

6.       Governing
Law. THE INTERNAL LAW OF THE STATE OF NEW YORK WILL GOVERN AND BE USED TO CONSTRUE THIS FOURTH SUPPLEMENT WITHOUT GIVING EFFECT
TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED
THEREBY.

 

EACH PARTY HERETO, AND EACH HOLDER OF A NOTE
BY ACCEPTANCE THEREOF, HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN RESPECT
OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS FOURTH SUPPLEMENT.

 

7.       Counterparts;
Electronic Signatures. The parties may sign any number of copies of this Fourth Supplement. Each signed copy will be an
original, but all of them together represent the same agreement. The exchange of copies of this Fourth Supplement and of signature
pages by facsimile or PDF transmission shall constitute effective execution and delivery of this Fourth Supplement as to the parties
hereto and may be used in lieu of the original of this Fourth Supplement for all purposes. Signatures of the parties hereto
transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. This Fourth Supplement and any
certificate, agreement or other document to be signed in connection with this Fourth Supplement and the transactions contemplated
hereby shall be valid, binding, and enforceable against a party when executed and delivered by an authorized individual on behalf of
the party by means of (i) an original manual signature; (ii) a faxed, scanned, or photocopied manual signature or
(iii) any other electronic signature permitted by the federal Electronic Signatures in Global and National Commerce Act, state
enactments of the Uniform Electronic Transactions Act and/or any other relevant electronic signatures law, including any relevant
provisions of the Uniform Commercial Code (collectively, “Signature Law”), in each case to the extent applicable.
Each faxed, scanned or photocopied manual signature, or other electronic signature, shall for all purposes have the same validity,
legal effect, and admissibility in evidence as an original manual signature. Each party hereto shall be entitled to conclusively
rely upon, and shall have no liability with respect to, any faxed, scanned or photocopied manual signature, or other electronic
signature, of any other party and shall have no duty to investigate, confirm or otherwise verify the validity or authenticity
thereof. This Fourth Supplement may be executed in any number of counterparts, each of which shall be deemed to be an original, but
such counterparts shall, together, constitute one and the same instrument. For the avoidance of doubt, original manual signatures
shall be used for execution or indorsement of writings when required under the Uniform Commercial Code or other Signature Law due to
the character or intended character of the writings.

 

    3 

     

    

 

8.       Effect
of Headings. The section headings herein have been inserted for convenience of reference only, are not to be considered a part of
this Fourth Supplement and will in no way modify or restrict any of the terms or provisions of this Fourth Supplement.

 

9.       Supplemental
Indenture Remains in Full Force and Effect. This Fourth Supplement shall form a part of the Supplemental Indenture for all purposes
and, except as supplemented or amended hereby, all other provisions in the Supplemental Indenture and the Notes, to the extent not inconsistent
with the terms and provisions of this Fourth Supplement, shall remain in full force and effect.

 

10.     Concerning
the Trustee. The Trustee makes no representation as to and shall not be responsible in any manner whatsoever for or in respect of
the validity or sufficiency of this Fourth Supplement or for or in respect of the recitals contained herein, all of which recitals are
made solely by the Company and CFIH, and the Trustee assumes no responsibility for the same. The Trustee makes no representation as to
and shall not be responsible in any manner whatsoever for or in respect of the Consent Solicitation Statement, the Consent Solicitation
or the consents of Holders. All of the provisions contained in the Supplemental Indenture in respect of the rights, powers, privileges,
and immunities of the Trustee shall be applicable in respect of this Fourth Supplement as fully and with like force and effect as though
fully set forth in full herein. The Company hereby confirms to the Trustee that this Fourth Supplement has not resulted in a material
modification of the Notes for Foreign Accounting Tax Compliance Act purposes.

 

[Signature page follows.]

 

    4 

     

    

 

IN WITNESS WHEREOF, the parties hereto have caused
this Fourth Supplement to be duly executed, all as of the date first written above.

 

	 	CF INDUSTRIES, INC.

 

	 	By:	/s/ Daniel L. Swenson
	 	 	Name: Daniel L. Swenson
	 	 	Title:   Vice President, Treasurer, and Assistant Secretary

 

	 	CF INDUSTRIES HOLDINGS, INC.

 

	 	By:	/s/ Daniel L. Swenson
	 	 	Name: Daniel L. Swenson
	 	 	Title:   Vice President, Treasurer, and Assistant Secretary

 

[Fourth Supplement to
Third Supplemental Indenture – CF Industries, Inc. 5.150% Senior Notes due 2034]

 

     

     

    

 

	 	WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee

 

		By:	Computershare Trust Company, N.A., as agent and attorney-in-fact

 

	 	By:	/s/ Linda Lopez
	 	 	Name: Linda Lopez
	 	 	Title:   Assistant Vice President

 

[Fourth Supplement to
Third Supplemental Indenture – CF Industries, Inc. 5.150% Senior Notes due 2034]

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