Item 1.01 Entry into a Material Definitive Agreement.

On September 27, 2021, American Tower Corporation (the "Company") completed a registered public offering of $600.0 million aggregate principal amount of its 1.450% senior unsecured notes due 2026 (the "2026 notes"), $700.0 million aggregate principal amount of its 2.300% senior unsecured notes due 2031 (the "2031 notes") and $500.0 million aggregate principal amount of its 2.950% senior unsecured notes due 2051 (the "2051 notes" and, collectively with the 2026 notes and 2031 notes, the "Notes"), which resulted in aggregate net proceeds to the Company of approximately $1,765.1 million (excluding $2,950,000.00 of accrued interest for the 2051 notes), after deducting commissions and estimated expenses. The 2051 notes will be consolidated, form a single series and be fully fungible, with the Company's outstanding $550,000,000 2.950% senior unsecured notes due 2051 issued on November 20, 2020. The Company used the net proceeds to repay existing indebtedness under its $1.0 billion unsecured term loan, as amended and restated in December 2019 and as further amended, and for general corporate purposes.

The Company issued the Notes under an indenture dated as of June 4, 2019 (the "Base Indenture"), as supplemented by, for the 2051 notes, a supplemental indenture dated as of November 20, 2020 (the "Supplemental Indenture No. 7") and, for the 2026 notes and the 2031 notes, a supplemental indenture dated as of September 27, 2021 (the "Supplemental Indenture No. 10" and, collectively with the Base Indenture and the Supplemental Indenture No. 7, the "Indenture"), each between the Company and U.S. Bank National Association, as trustee (the "Trustee"). The following description of the Indenture is a summary and is qualified in its entirety by reference to the detailed provisions of the Indenture.

The 2026 notes will mature on September 15, 2026 and bear interest at a rate of 1.450% per annum. The 2031 notes will mature on September 15, 2031 and bear interest at a rate of 2.300% per annum. The 2051 notes will mature on January 15, 2051 and bear interest at a rate of 2.950% per annum. Accrued and unpaid interest on the 2026 notes and the 2031 notes will be payable in U.S. Dollars semi-annually in arrears on March 15 and September 15 of each year, beginning on March 15, 2022. Accrued and unpaid interest on the 2051 notes will be payable in U.S. Dollars semi-annually in arrears on January 15 and July 15 of each year, beginning on January 15, 2022. Interest on the 2026 notes and the 2031 notes will accrue from September 27, 2021, and interest on the 2051 notes will accrue from July 15, 2021, and will each be computed on the basis of a 360-day year comprised of twelve 30-day months. The terms of the Indenture, among other things, limit the Company's ability to merge, consolidate or sell assets and the Company's and its subsidiaries' abilities to incur liens. These covenants are subject to a number of exceptions, including that the Company and its subsidiaries may incur liens on assets, mortgages or other liens securing indebtedness, provided the aggregate amount of indebtedness secured by such liens shall not exceed 3.5x Adjusted EBITDA as defined in the Indenture.

The Company may redeem the Notes at any time, in whole or in part, at its election at the applicable redemption price. If the Company redeems the 2026 notes prior to August 15, 2026, the 2031 notes prior to June 15, 2031 or the 2051 notes prior to July 15, 2050, the Company will pay a redemption price equal to 100% of the principal amount of the notes being redeemed plus a make-whole premium, together with accrued interest to the redemption date. If the Company redeems the 2026 notes on or after August 15, 2026, the 2031 notes on or after June 15, 2031 or the 2051 notes on or after July 15, 2050, the Company will pay a redemption price equal to 100% of the principal amount of the notes being redeemed plus accrued interest to the redemption date. In addition, if the Company undergoes a Change of Control and Ratings Decline, each as defined in the Indenture, the Company may be required to repurchase all of the Notes at a purchase price equal to 101% of the principal amount of the Notes, plus accrued and unpaid interest (including additional interest, if any), up to but not including the repurchase date.

The Indenture provides that each of the following is an event of default ("Event of Default"): (i) default for 30 days in payment of any interest due with respect to the Notes; (ii) default in payment of principal or premium, if any, on the Notes when due, at maturity, upon any redemption, by declaration or otherwise; (iii) failure by the Company to comply with covenants in the Indenture or Notes for 90 days after

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receiving notice; and (iv) certain events of bankruptcy or insolvency with respect to the Company or any of its Significant Subsidiaries. If any Event of Default arising under clause (iv) above occurs, the principal amount and accrued and unpaid interest on all the outstanding Notes will become due and payable immediately without further action or notice. If any other Event of Default occurs and is continuing, the Trustee or the holders of at least 25% in principal amount of the then outstanding Notes may declare the entire principal amount on all the outstanding Notes to be due and payable immediately.

The foregoing is only a summary of certain provisions and is qualified in its entirety by the terms of the Base Indenture, as filed with the Securities and Exchange Commission (the "SEC") on June 4, 2019 as an exhibit to the Company's Registration Statement on Form S-3 (No. 333-231931), the Supplemental Indenture No. 7, as filed with the SEC on November 20, 2020 as an exhibit to the Company's Current Report on Form 8-K, and the Supplemental Indenture No. 10, a copy of which is filed herewith as Exhibit 4.1, and incorporated by reference herein.

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an

Off-Balance Sheet Arrangement of a Registrant.

Please refer to the discussion under Item 1.01 above, which is incorporated under this Item 2.03 by reference.

Item 9.01 Financial Statements and Exhibits.




A copy of the opinion of Cleary Gottlieb Steen & Hamilton LLP relating to the
legality of the issuance by the Company of the Notes is attached as Exhibit 5.1
hereto.

(d) Exhibits



Exhibit No.       Description

4.1                 Supplemental Indenture No. 10, dated as of September 27, 2021,
                  by and between American Tower Corporation and U.S. Bank National
                  Association, as trustee.

5.1                 Opinion of Cleary Gottlieb Steen & Hamilton LLP.

23.1                Consent of Cleary Gottlieb Steen & Hamilton LLP (included in
                  Exhibit 5.1 hereto).

104               Cover Page Interactive Data File (embedded within the Inline XBRL
                  document).

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