Exhibit 99.1
LETTER OF TRANSMITTAL
To Tender for Exchange
$325,866,000 aggregate principal amount 3.500% Senior Notes due 2026
(CUSIP Numbers 43475RAL0 / U4335PAL3)
$700,000,000 aggregate principal amount 4.600% Senior Notes due 2027
(CUSIP Numbers 43475RAA4 / U4335PAA7)
$700,000,000 aggregate principal amount 4.700% Senior Notes due 2028
(CUSIP Numbers 43475RAB2 / U4335PAB5)
$1,000,000,000 aggregate principal amount 4.950% Senior Notes due 2030
(CUSIP Numbers 43475RAC0 / U4335PAC3)
$50,000,000 aggregate principal amount 4.200% Senior Notes due 2033
(CUSIP Numbers 43475RAF3 / U4335PAF6)
$1,000,000,000 aggregate principal amount 5.400% Senior Notes due 2035
(CUSIP Numbers 43475RAD8 / U4335PAD1)
$444,530,000 aggregate principal amount 7.125% Senior Notes due 2036
(CUSIP Numbers 43475RAG1 / U4335PAG4)
$191,348,000 aggregate principal amount 6.875% Senior Notes due 2039
(CUSIP Numbers 43475RAH9 / U4335PAH2)
$238,925,000 aggregate principal amount 6.500% Senior Notes due 2043
(CUSIP Numbers 43475RAJ5 / U4335PAJ8)
$553,505,000 aggregate principal amount 4.750% Senior Notes due 2046
(CUSIP Numbers 43475RAK2 / U4335PAK5)
AMRIZE LTD
AMRIZE FINANCE US LLC

THE EXCHANGE OFFERS WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON [●], 2025, UNLESS EXTENDED (THE “EXPIRATION DATE”). TENDERS OF INITIAL NOTES MAY BE WITHDRAWN PRIOR TO 5:00 P.M., NEW YORK CITY TIME, ON THE EXPIRATION DATE.

The Bank of New York Mellon, Exchange Agent
By Registered or Certified Mail, Overnight Delivery
c/o BNY Mellon
The Bank of New York Mellon
Corporate Trust Operations – Reorganization Unit
500 Ross Street, Suite 625
Pittsburgh, PA 15262
Attn: Pamela Adamo
For Information Call:
Telephone: 315-414-3349

Confirm by E-mail:
CT_REORG_UNIT_INQUIRIES@bnymellon.com

DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE, OR TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE OTHER THAN AS SET FORTH ABOVE, WILL NOT CONSTITUTE A VALID DELIVERY.
PLEASE READ THIS ENTIRE LETTER OF TRANSMITTAL CAREFULLY BEFORE COMPLETING ANY BOX BELOW.
The undersigned acknowledges that he or she has received the prospectus, dated October [●], 2025 (the “Prospectus”), of Amrize Ltd, incorporated in Switzerland with limited liability (the “Company”) and Amrize Finance US LLC, a Delaware limited liability company and a wholly-owned subsidiary of the Company (the “Issuer” and together with the Company, “Amrize”), and this Letter of Transmittal (the “Letter”), which together constitute Amrize’s offers (the “Exchange Offers”) to exchange $325,866,000 aggregate principal amount 3.500% Senior Notes due 2026(CUSIP Number 43475R AN6), $700,000,000 aggregate principal amount 4.600% Senior Notes due 2027 (CUSIP Number 43475R AP1), $700,000,000 aggregate principal amount 4.700% Senior Notes due 2028 (CUSIP Number 43475R AQ9), $1,000,000,000 aggregate principal amount 4.950% Senior Notes due 2030 (CUSIP Number 43475R AR7), $50,000,000 aggregate principal amount 4.200% Senior Notes due 2033(CUSIP Number 43475R AS5), $1,000,000,000 aggregate principal amount 5.400% Senior Notes due 2035 (CUSIP Number 43475R AT3), $444,530,000 aggregate principal amount 7.125% Senior Notes due 2036 (CUSIP Number 43475R AU0), $191,348,000 aggregate principal amount 6.875% Senior Notes due 2039 (CUSIP Number 43475R AV8), $238,925,000 aggregate principal amount 6.500% Senior Notes due 2043 (CUSIP Number 43475R AW6) and $553,505,000 aggregate principal amount 4.750% Senior Notes due 2046 (CUSIP Number 43475R AX4) (the “Exchange Notes”), for a like aggregate principal amount of its outstanding $325,866,000 aggregate principal amount 3.500% Senior Notes due 2026 (CUSIP Numbers 43475RAL0 / U4335PAL3), $700,000,000 aggregate principal amount 4.600% Senior Notes due 2027 (CUSIP Numbers 43475RAA4 / U4335PAA7), $700,000,000 aggregate principal amount 4.700% Senior Notes due 2028 (CUSIP Numbers 43475RAB2 / U4335PAB5), $1,000,000,000 aggregate principal amount 4.950% Senior Notes due 2030 (CUSIP Numbers 43475RAC0 / U4335PAC3), $50,000,000 aggregate principal amount 4.200% Senior Notes due 2033(CUSIP Numbers 43475RAF3 / U4335PAF6), $1,000,000,000 aggregate principal amount 5.400% Senior Notes due 2035 (CUSIP Numbers 43475RAD8 / U4335PAD1), $444,530,000 aggregate principal amount 7.125% Senior Notes due 2036 (CUSIP Numbers 43475RAG1 / U4335PAG4), $191,348,000 aggregate principal amount 6.875% Senior Notes due 2039 (CUSIP Numbers 43475RAH9 / U4335PAH2), $238,925,000 aggregate principal amount 6.500% Senior Notes due 2043 (CUSIP Numbers 43475RAJ5 / U4335PAJ8) and $553,505,000 aggregate principal amount 4.750% Senior Notes due 2046 (CUSIP Numbers 43475RAK2 / U4335PAK5) (collectively, the “Initial Notes”) that were issued and sold in reliance upon an exemption from registration under the Securities Act of 1933, as amended (the “Securities Act”).
For each Initial Note accepted for exchange, the holder of such Initial Note will receive an Exchange Note having an aggregate principal amount equal to that of the surrendered Initial Note.
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This Letter is to be completed by a holder of Initial Notes either if certificates are to be forwarded herewith or if a tender of certificates for Initial Notes, if available, is to be made by book‑entry transfer to the account maintained by the Exchange Agent at The Depository Trust Company (the “Book-Entry Transfer Facility”) pursuant to the procedures set forth in “The Exchange Offers—Procedures for Tendering Initial Notes—Book-Entry Delivery Procedure” section of the Prospectus and an Agent’s Message (as defined herein) is not delivered. Delivery of this Letter and any other required documents should be made to the Exchange Agent. Delivery of documents to the Book-Entry Transfer Facility does not constitute delivery to the Exchange Agent.
The undersigned has completed the appropriate boxes below and signed this Letter to indicate the action the undersigned desires to take with respect to the Exchange Offers. Holders who wish to exchange their Initial Notes must complete this Letter in its entirety.
The instructions included with this Letter must be followed. Questions and requests for assistance or for additional copies of the Prospectus and this Letter may be directed to the Exchange Agent.
List below the Initial Notes to which this Letter relates. If the space provided below is inadequate, the certificate numbers and principal amount of Initial Notes should be listed on a separate signed schedule affixed to this Letter.

DESCRIPTION OF INITIAL NOTES (See Instruction 2)
Series of Initial Notes | Name(s) and Address(es) of Registered Holder(s) Exactly as Name(s) appear(s) on Initial Notes (Please fill in, if blank) | Certificate Number(s)* | Aggregate Principal Amount Represented by Certificate | Principal Amount Tendered (if less than all)**
|  | Total |  |
* Need not be completed if Initial Notes are being tendered by book-entry transfer. ** Unless otherwise indicated in this column, the holder will be deemed to have tendered the full aggregate principal amount represented by such Initial Notes. See Instruction 2. Initial Notes tendered hereby must be in denominations of principal amount that are $2,000 and integral multiples of $1,000 in excess thereof. See Instruction 1.

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☐ | CHECK HERE IF TENDERED INITIAL NOTES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER MADE TO THE ACCOUNT MAINTAINED BY THE EXCHANGE AGENT WITH THE BOOK-ENTRY TRANSFER FACILITY AND COMPLETE THE FOLLOWING:

| Name of Tendering Institution: |  |

| Account Number: |  |  | Transaction Code Number: |  |

By crediting Initial Notes to the Exchange Agent’s Account at the Book-Entry Transfer Facility in accordance with the Book-Entry Transfer Facility’s Automated Tender Offer Program (“ATOP”) and by complying with applicable ATOP procedures with respect to the Exchange Offers, including transmitting an Agent’s Message to the Exchange Agent in which the holder of Initial Notes acknowledges and agrees to be bound by the terms of this Letter, the participant in ATOP confirms on behalf of itself and the beneficial owners of such Initial Notes all provisions of this Letter applicable to it and such beneficial owners as if it had completed the information required herein and executed and transmitted this Letter to the Exchange Agent.

☐ | CHECK HERE IF YOU ARE A BROKER-DEALER.

☐ | CHECK HERE IF YOU WISH TO RECEIVE 10 ADDITIONAL COPIES OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS THERETO.

| Name: |
| Address: |

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PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY
Ladies and Gentlemen:
Upon the terms and subject to the conditions of each Exchange Offer, the undersigned hereby tenders to Amrize for exchange the aggregate principal amount of Initial Notes indicated above. Unless otherwise indicated above, the undersigned will be deemed to have tendered the full aggregate principal amount represented by the Initial Notes. Subject to, and effective upon, the acceptance for exchange of the Initial Notes tendered hereby, the undersigned hereby exchanges, assigns and transfers to, or upon the order of, Amrize all right, title and interest in and to such Initial Notes as are being tendered hereby.
The undersigned hereby irrevocably constitutes and appoints the Exchange Agent as the true and lawful agent and attorney-in-fact of the undersigned (with full knowledge that the Exchange Agent also acts as the agent of Amrize in connection with the Exchange Offers) with respect to the tendered Initial Notes with full power of substitution to (i) deliver such Initial Notes, or transfer ownership of such Initial Notes on the account books maintained by the Book-Entry Transfer Facility, to Amrize and deliver all accompanying evidences of transfer and authenticity, and (ii) present such Initial Notes for transfer on the books of Amrize and receive all benefits and otherwise exercise all rights of beneficial ownership of such Initial Notes, all in accordance with the terms of the Exchange Offers. The power of attorney granted in this paragraph shall be deemed to be irrevocable and coupled with an interest.
The undersigned hereby represents and warrants that the undersigned has full power and authority to tender, exchange, assign and transfer the Initial Notes tendered hereby and to acquire Exchange Notes issuable upon the exchange of such tendered Initial Notes, and that Amrize will acquire good and unencumbered title thereto, free and clear of all liens, restrictions, charges and encumbrances and not subject to any adverse claim when the same are accepted by Amrize.
The undersigned acknowledges that this Exchange Offers is being made in reliance on interpretations by the staff of the Securities and Exchange Commission (the “SEC”), as set forth in no‑action letters issued to third parties, that the Exchange Notes issued in exchange for the Initial Notes pursuant to the Exchange Offers may be offered for resale, resold and otherwise transferred by holders thereof (other than (i) any such holder that is an “affiliate” of Amrize within the meaning of Rule 405 under the Securities Act or (ii) any broker‑dealer that purchases Initial Notes from Amrize to resell pursuant to Rule 144A under the Securities Act (“Rule 144A”) or any other available exemption), without compliance with the registration and prospectus delivery provisions of the Securities Act, provided that such Exchange Notes are acquired in the ordinary course of such holders’ business and such holders have no arrangement with any person to participate in the distribution of such Exchange Notes and are not participating in, and do not intend to participate in, the distribution of the Exchange Notes. The undersigned acknowledges that Amrize does not intend to request the SEC to consider, and the SEC has not considered the Exchange Offers in the context of a no‑action letter, and there can be no assurance that the staff of the SEC would make a similar determination with respect to the Exchange Offers as in other circumstances. The undersigned acknowledges that any holder that is an affiliate of Amrize, or is participating in or intends to participate in or has any arrangement or understanding with respect to the distribution of the Exchange Notes to be acquired pursuant to the Exchange Offers, (i) cannot rely on the applicable interpretations of the staff of the SEC and (ii) must comply with the registration and prospectus delivery requirements of the Securities Act in connection with any resale transaction.
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The undersigned hereby further represents that (i) any Exchange Notes acquired pursuant to the Exchange Offers are being acquired in the ordinary course of business of the person receiving such Exchange Notes, whether or not such person is the holder; (ii) such holder or other person has no arrangement or understanding with any person to participate in a distribution of such Exchange Notes within the meaning of the Securities Act and is not participating in, and does not intend to participate in, the distribution of such Exchange Notes within the meaning of the Securities Act and (iii) such holder or such other person is not an “affiliate,” as defined in Rule 405 under the Securities Act, of Amrize or, if such holder or such other person is an affiliate, such holder or such other person will comply with the registration and prospectus delivery requirements of the Securities Act to the extent applicable.
If the undersigned is not a broker‑dealer, the undersigned represents that it is not engaged in, and does not intend to engage in, a distribution of Exchange Notes. If the undersigned is a broker-dealer, it represents that it will receive Exchange Notes for its own account in exchange for Initial Notes that were acquired by it as a result of market-making activities, or other trading activities, and acknowledges that it will deliver a prospectus in connection with any resale, offer to resell or other transfer of such Exchange Notes; however, by so acknowledging and by delivering a prospectus, the undersigned will not be deemed to admit that it is an “underwriter” within the meaning of the Securities Act.
The undersigned also warrants that acceptance of any tendered Initial Notes by Amrize and the issuance of Exchange Notes in exchange therefor shall constitute performance in full by Amrize of certain of its obligations under the (i) Registration Rights Agreement, dated as of April 7, 2025, among the Company, the Issuer, Goldman Sachs & Co. LLC, BNP Paribas Securities Corp., BofA Securities, Inc., Citigroup Global Markets Inc., Mizuho Securities USA LLC and Santander US Capital Markets LLC and (ii) Registration Rights Agreement, dated June 18, 2025, among the Company, the Issuer, BNP Paribas Securities Corp., BofA Securities, Inc., Citigroup Global Markets Inc., Goldman Sachs & Co. LLC, J.P. Morgan Securities LLC, Mizuho Securities USA LLC and Santander US Capital Markets LLC, which have each been filed exhibits to the registration statement in connection with the Exchange Offers.
The undersigned will, upon request, execute and deliver any additional documents deemed by Amrize to be necessary or desirable to complete the sale, assignment and transfer of the Initial Notes tendered hereby. All authority conferred or agreed to be conferred in this Letter and every obligation of the undersigned hereunder shall be binding upon the successors, assigns, heirs, executors, administrators, trustees in bankruptcy and legal representatives of the undersigned and shall not be affected by, and shall survive, the death or incapacity of the undersigned. This tender may be withdrawn only in accordance with the procedures set forth in this Letter.
The undersigned understands that tenders of the Initial Notes pursuant to any one of the procedures described under “The Exchange Offers—Procedures for Tendering Initial Notes” in the Prospectus and in the instructions hereto will constitute a binding agreement between the undersigned and Amrize in accordance with the terms and subject to the conditions of the Exchange Offers.
The undersigned recognizes that, under certain circumstances set forth in the Prospectus under “The Exchange Offers—Conditions to the Exchange Offers” Amrize may not be required to accept for exchange any of the Initial Notes tendered. Initial Notes not accepted for exchange or withdrawn will be returned to the undersigned at the address set forth below unless otherwise indicated under “Special Delivery Instructions” below.
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Unless otherwise indicated herein in the box entitled “Special Issuance Instructions” below, please deliver the Exchange Notes (and, if applicable, substitute certificates representing Initial Notes for any Initial Notes not exchanged) in the name of the undersigned or, in the case of a book‑entry delivery of Initial Notes, please credit the account indicated above maintained at the Book Entry Transfer Facility. Similarly, unless otherwise indicated under the box entitled “Special Delivery Instructions” below, please send the Exchange Notes (and, if applicable, substitute certificates representing Initial Notes for any Initial Notes not exchanged) to the undersigned at the address shown below the undersigned’s signature(s). In the event that both “Special Issuance Instructions” and “Special Delivery Instructions” are completed, please issue the Exchange Notes issued in exchange for the Initial Notes accepted for exchange (and, if applicable, substitute certificates representing Initial Notes for any Initial Notes not exchanged) in the names of the person(s) so indicated. The undersigned recognizes that Amrize has no obligation pursuant to the “Special Issuance Instructions” and “Special Delivery Instructions” to transfer any Initial Notes from the name of the registered holder(s) thereof if Amrize does not accept for exchange any of the Initial Notes so tendered for exchange.
The Book-Entry Transfer Facility, as the holder of record of certain Initial Notes, has granted authority to the Book-Entry Transfer Facility participants whose names appear on a security position listing with respect to such Initial Notes as of the date of tender of such Initial Notes to execute and deliver this Letter as if they were the holders of record. Accordingly, for purposes of this Letter, the term “holder” shall be deemed to include such Book-Entry Transfer Facility participants.
THE UNDERSIGNED, BY COMPLETING THE BOX ENTITLED “DESCRIPTION OF INITIAL NOTES” ABOVE AND SIGNING THIS LETTER AND DELIVERING SUCH NOTES AND THIS LETTER TO THE EXCHANGE AGENT, WILL BE DEEMED TO HAVE TENDERED THE INITIAL NOTES AS SET FORTH IN SUCH BOX ABOVE.
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| SPECIAL ISSUANCE INSTRUCTIONS (See Instructions 3, 4, 5 and 6) |  |  |  | SPECIAL DELIVERY INSTRUCTIONS (See Instructions 3, 4, 5 and 6) |
| To be completed ONLY if certificates for Initial Notes not tendered or not accepted for exchange, or Exchange Notes issued in exchange for Initial Notes accepted for exchange, are to be issued in the name of and sent to someone other than the undersigned, or if Initial Notes delivered by book-entry transfer which are not accepted for exchange are to be returned by credit to an account maintained at the Book-Entry Transfer Facility other than the account indicated above. |  |  |  | To be completed ONLY if certificates for Initial Notes not tendered or not accepted for exchange, or Exchange Notes issued in exchange for Initial Notes accepted for exchange, are to be sent to someone other than the undersigned or to the undersigned at an address other than shown in the box entitled “Description of Initial Notes” above. |
| Issue (certificates) to: |  |  |  | Mail to: |
| Name(s): |  |  |  |  | Name(s): |  |
| (Please Type or Print) |  |  |  | (Please Type or Print) |
| (Please Type or Print) |  |  |  | (Please Type or Print) |
| Address: |  |  |  |  | Address: |  |
| (Include Zip Code) |  |  |  | (Include Zip Code) |
| (Taxpayer Identification or Social Security Number) |  |  |  | (Taxpayer Identification or Social Security Number) |
| (Complete IRS Form W-9) |  |  |  | (Complete IRS Form W-9) |
| • Credit unexchanged Initial Notes delivered by book-entry transfer to the Book-Entry Transfer Facility account set forth below. |  |  |  |  |
| (Book-Entry Transfer Facility Account Number, if applicable) |  |  |  |  |

IMPORTANT: THIS LETTER OR A FACSIMILE HEREOF OR AN AGENT’S MESSAGE IN LIEU HEREOF (IN EACH CASE, TOGETHER WITH THE CERTIFICATE(S) FOR INITIAL NOTES OR A CONFIRMATION OF BOOK-ENTRY TRANSFER AND ALL OTHER REQUIRED DOCUMENTS) MUST BE RECEIVED BY THE EXCHANGE AGENT PRIOR TO 5:00 P.M., NEW YORK CITY TIME, ON THE EXPIRATION DATE.
PLEASE READ THIS ENTIRE LETTER OF TRANSMITTAL
CAREFULLY BEFORE COMPLETING ANY BOX ABOVE.
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| PLEASE SIGN HERE (TO BE COMPLETED BY ALL TENDERING HOLDERS WHETHER OR NOT INITIAL NOTES ARE BEING PHYSICALLY TENDERED HEREBY) (Please Also Complete and Return the Accompanying IRS Form W-9) |
| x |  |  |
| x |  |  |
| Signature(s) of Owner(s) |  | Date |
| Area Code and Telephone Number: |  |  |  |
| If a holder is tendering any Initial Notes, this Letter must be signed by the registered holder(s) exactly as the name(s) appear(s) on the certificate(s) for the Initial Notes or on a security position listing as the owner of Initial Notes by person(s) authorized to become registered holder(s) by a properly completed bond power from the registered holder(s), a copy of which must be transmitted with this Letter. If Initial Notes to which this Letter relates are held of record by two or more joint holders, then all such holders must sign this Letter. If signature is by a trustee, executor, administrator, guardian, attorney-in-fact, officer of corporation or other person acting in a fiduciary or representative capacity, then such person must (i) set forth his or her full title below and (ii) unless waived by Amrize, submit evidence satisfactory to Amrize of such person’s authority to so act. See Instruction 3. |
| Name(s): |  |  |  |  |
| (Please Type or Print) |
| (Please Type or Print) |
| Capacity: |  |  |  |  |
| Address: |  |  |  |  |
| (Including Zip Code) |
| SIGNATURE GUARANTEE BY AN ELIGIBLE INSTITUTION (If required by Instruction 3) |
| Signature(s) Guaranteed by an Eligible Institution: |  |  |  |
| (Authorized Signature) |
| (Title) |
| (Name of Firm) |
| (Address, Include Zip Code) |
| (Area Code and Telephone Number) |
| Dated: |  |  |  |  |

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INSTRUCTIONS
Forming Part of the Terms and Conditions of the Exchange Offers

1. | Delivery of this Letter and Initial Notes.

This Letter is to be completed by noteholders either if certificates are to be forwarded herewith or if tenders are to be made pursuant to the procedures for delivery by book-entry transfer set forth in “The Exchange Offers—Procedures for Tendering Initial Notes—Book-Entry Delivery Procedure” section of the Prospectus and an Agent’s Message is not delivered. Certificates for all physically tendered Initial Notes, or Book‑Entry Confirmation, as the case may be, as well as a properly completed and duly executed Letter (or manually signed facsimile hereof) and any other documents required by this Letter, must be received by the Exchange Agent at the address set forth herein on or prior to 5:00 p.m., New York City time, on the Expiration Date. Initial Notes tendered hereby must be in denominations of principal amount that are $2,000 and integral multiples of $1,000 in excess thereof. The term “Agent’s Message” means a message, transmitted by The Depository Trust Company and received by the Exchange Agent and forming a part of the Book-Entry Confirmation, which states that the Book-Entry Transfer Facility has received an express acknowledgment from a participant tendering Initial Notes which are subject to the Book-Entry Confirmation and that such participant has received and agrees to be bound by this Letter and that Amrize may enforce this Letter against such participant.
The method of delivery of this Letter, the Initial Notes and all other required documents is at the election and risk of the tendering holders, but the delivery will be deemed made only when actually received or confirmed by the Exchange Agent. If Initial Notes are sent by mail, it is suggested that the mailing be made sufficiently in advance of the Expiration Date to permit delivery to the Exchange Agent prior to 5:00 p.m., New York City time, on the Expiration Date.
See “The Exchange Offers” section of the Prospectus.

2. | Partial Tenders (not applicable to noteholders who tender by book‑entry transfer).

Tenders of Initial Notes will be accepted only in denominations of principal amount that are $2,000 and integral multiples of $1,000 in excess thereof. If less than the entire principal amount of any Initial Notes is tendered, the tendering holder(s) should fill in the principal amount of Initial Notes to be tendered in the box above entitled “Description of Initial Notes.” The entire principal amount of the Initial Notes delivered to the Exchange Agent will be deemed to have been tendered unless otherwise indicated. If the entire principal amount of Initial Notes is not tendered, then Initial Notes for the principal amount of Initial Notes not tendered and Exchange Notes issued in exchange for any Initial Notes accepted will be sent to the holder at his or her registered address, unless otherwise provided in the appropriate box on this Letter, promptly after the Initial Notes are accepted for exchange.

3. | Signatures on this Letter; Bond Powers and Endorsements; Guarantee of Signatures.

If this Letter is signed by the registered holder of the Initial Notes tendered hereby, the signature must correspond with the name(s) as written on the face of the certificates representing such Initial Notes without alteration, enlargement or any change whatsoever.
If this Letter is signed by a participant in the Book-Entry Transfer Facility, the signature must correspond with the name as it appears on the security position listing as the holder of the Initial Notes.
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If any tendered Initial Notes are owned of record by two or more joint owners, all of such owners must sign this Letter.
If any tendered Initial Notes are registered in different names on several certificates, it will be necessary to complete, sign and submit as many separate copies of this Letter as there are different registrations of certificates.
When this Letter is signed by the registered holder or holders of the Initial Notes specified herein and tendered hereby, no endorsements of certificates or separate bond powers are required. If, however, the Exchange Notes are to be issued, or any untendered Initial Notes are to be reissued, to a person other than the registered holder, then endorsements of any certificates transmitted hereby or separate bond powers are required. Signatures on such certificate(s) must be guaranteed by an Eligible Institution.
If this Letter is signed by a person other than the registered holder or holders of any certificate(s) specified herein, such certificate(s) must be endorsed or accompanied by appropriate bond powers, in either case signed exactly as the name or names of the registered holder or holders appear(s) on the certificate(s) and signatures on such certificate(s) must be guaranteed by an Eligible Institution.
If this Letter or any certificates or bond powers are signed by trustees, executors, administrators, guardians, attorneys-in-fact, officers of corporations or others acting in a fiduciary or representative capacity, such persons should so indicate when signing, and, unless waived by Amrize, evidence satisfactory to Amrize of its authority to so act must be submitted with the Letter.
Endorsements on certificates for Initial Notes or signatures on bond powers required by this Instruction 3 must be guaranteed by a firm which is a member of a registered national securities exchange or a member of the Financial Industry Regulatory Authority, Inc., or a commercial bank, a clearing agency, insured credit union, a savings association or trust company having an office or correspondent in the United States or an “eligible guarantor institution” within the meaning of Rule 17Ad-15 under the Securities Exchange Act of 1934, as amended (each an “Eligible Institution”).
Signatures on this Letter need not be guaranteed by an Eligible Institution if the Initial Notes are tendered: (i) by a registered holder of Initial Notes (which term, for purposes of the Exchange Offers, includes any participant in the Book-Entry Transfer Facility system whose name appears on a security position listing as the holder of such Initial Notes) who has not completed the box entitled “Special Issuance Instructions” or “Special Delivery Instructions” on this Letter, or (ii) for the account of an Eligible Institution.

4. | Special Issuance and Delivery Instructions.

Tendering holders of Initial Notes should indicate, in the applicable box or boxes, the name and address (or account at the Book-Entry Transfer Facility) to which Exchange Notes issued pursuant to the Exchange Offers, or substitute Initial Notes not tendered or accepted for exchange, are to be issued or sent, if different from the name or address of the person signing this Letter. In the case of issuance in a different name, the employer identification or social security number of the person named must also be indicated. Holders tendering Initial Notes by book-entry transfer may request that Initial Notes not exchanged be credited to such account maintained at the Book-Entry Transfer Facility as such noteholder may designate hereon. If no such instructions are given, such Initial Notes not exchanged will be returned to the name or address of the person signing this Letter.
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5. | IRS Form W-9.

Under U.S. federal income tax law, payments made in respect of Exchange Notes issued pursuant to the Exchange Offers may be subject to backup withholding at the rate, currently 24%, specified in Section 3406(a)(1) of the Code (the “Specified Rate”). In order to avoid such backup withholding, each tendering holder (or other payee) that is a U.S. person (including a U.S. resident alien) should complete and sign the Internal Revenue Service (“IRS”) Form W-9 included with this Letter, on which form such holder must provide the correct taxpayer identification number (“TIN”) and certify, under penalties of perjury, that (a) the TIN provided is correct or that such holder is awaiting a TIN; (b) the holder is not subject to backup withholding because (i) the holder has not been notified by the IRS that the holder is subject to backup withholding as a result of failure to report interest or dividends, (ii) the IRS has notified the holder that the holder is no longer subject to backup withholding, or (iii) the holder is exempt from backup withholding; and (c) the holder is a U.S. person (including a U.S. resident alien). If a holder has been notified by the IRS that it is subject to backup withholding, it must follow the applicable instructions included with the IRS Form W-9.
The holder (other than an exempt or foreign holder subject to the requirements described below) is required to give the TIN (in general, if an individual, the holder’s Social Security number, otherwise, the holder’s employer identification number) of the record holder of the Initial Notes. If the tendering holder has not been issued a TIN and has applied for one or intends to apply for one in the near future, such holder should follow the applicable instructions included with the IRS Form W-9. If the Exchange Agent or Amrize is not provided with the correct TIN, the holder may be subject to a $50 penalty imposed by the Code in addition to backup withholding at the Specified Rate on payments to such holder.
Certain holders (including all corporations and certain holders that are neither U.S. persons nor U.S. resident aliens (“foreign holders”)) are not subject to these backup withholding and reporting requirements. Such an exempt holder, other than a foreign holder, should enter the holder’s name, address, status and TIN on the IRS Form W-9 and check the “Exempt Payee” box on the IRS Form W-9, sign, date and return the IRS Form W-9 to the Paying Agent, and should follow the additional instructions included with the IRS Form W-9. A foreign holder should not complete the IRS Form W-9. In order for a foreign holder to qualify as an exempt recipient, such holder must submit a statement (generally, the IRS Form W-8BEN), signed under penalties of perjury, attesting to that person’s exempt status. Such statements can be obtained from the Exchange Agent or online from the IRS at www.irs.gov. For further information concerning backup withholding and instructions for completing the IRS Form W-9 (including how to obtain a TIN if you do not have one and how to complete the IRS Form W-9 if Initial Notes are registered in more than one name), consult the instructions included with the IRS Form W-9.
Failure to complete the IRS Form W-9 will not, by itself, cause Initial Notes to be deemed invalidly tendered, but may require Amrize (or the Paying Agent) to withhold at the Specified Rate on payments made in respect of Exchange Notes. Backup withholding is not an additional tax. Rather, if the required information is furnished to the IRS, the federal income tax liability of a person subject to backup withholding will be reduced by the amount of tax withheld. If withholding results in an overpayment of taxes, a refund may be obtained provided that the required information is timely furnished to the IRS.
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6. | Transfer Taxes.

Amrize will pay all transfer taxes, if any, applicable to the transfer of Initial Notes to it or its order pursuant to the Exchange Offers. If, however, Exchange Notes or substitute Initial Notes not exchanged are to be delivered to, or are to be registered or issued in the name of, any person other than the registered holder of the Initial Notes tendered hereby, or if tendered Initial Notes are registered in the name of any person other than the person signing this Letter, or if a transfer tax is imposed for any reason other than the transfer of Initial Notes to Amrize or its order pursuant to the Exchange Offers, the amount of any such transfer taxes (whether imposed on the registered holder or any other persons) will be payable by the tendering holder. If satisfactory evidence of payment of such taxes or exemption therefrom is not submitted with this Letter, the amount of such transfer taxes will be billed directly to such tendering holder.
Except as provided in this Instruction 6, it will not be necessary for transfer tax stamps to be affixed to the Initial Notes specified in this Letter or for funds to cover such stamps to be provided with the Initial Notes specified in this Letter.

7. | Waiver of Conditions.

Amrize reserves the absolute right to amend, waive or modify, in whole or in part, any or all conditions to the Exchange Offers.

8. | No Conditional Tenders.

No alternative, conditional, irregular or contingent tenders will be accepted. All tendering holders of Initial Notes, by execution of this Letter, shall waive any right to receive notice of the acceptance of their Initial Notes for exchange.
Neither Amrize, the Exchange Agent nor any other person is obligated to give notice of any defect or irregularity with respect to any tender of Initial Notes nor shall any of them incur any liability for failure to give any such notice.

9. | Mutilated, Lost, Stolen or Destroyed Initial Notes.

Any holder whose Initial Notes have been mutilated, lost, stolen or destroyed should contact the Exchange Agent at the address indicated above for further instructions. This Letter and related documents cannot be processed until the Initial Notes have been replaced.

10. | Requests for Assistance or Additional Copies.

Questions relating to the procedure for tendering, as well as requests for additional copies of the Prospectus and this Letter, may be directed to the Exchange Agent, at the address and telephone number indicated above.

11. | Incorporation of Letter of Transmittal.

This Letter shall be deemed to be incorporated in and acknowledged and accepted by any tender through the Book-Entry Transfer Facility’s ATOP procedures by any participant on behalf of itself and the beneficial owners of any Initial Notes so tendered.

12. | Withdrawals.

Tenders of Initial Notes may be withdrawn only pursuant to the limited withdrawal rights set forth in the Prospectus under the caption “The Exchange Offers—Withdrawal of Tenders” in the Prospectus.
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