Price per share of shares acquired (in dollars per share)

AMERICAN TOWER CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(tabular amounts in millions, unless otherwise noted)CoreSite Acquisition—On November 14, 2021, the Company entered into an agreement with CoreSite to acquire all issued and outstanding shares of CoreSite common stock at $170.00 per share. CoreSite’s portfolio consisted of 24 data center facilities and related assets in eight United States markets. On December 28, 2021, the Company completed the CoreSite Acquisition for total consideration of approximately $10.4 billion, including the assumption and repayment of CoreSite’s existing debt. The acquired assets and operations are included in the Data Centers segment. The CoreSite Acquisition was accounted for as a business combination and is subject to post-closing adjustments. The full reconciliation and finalization of the assets acquired and liabilities assumed, including those subject to valuation, have not been completed and, as a result, there may be additional post-closing adjustments.The following table summarizes the preliminary and updated allocation of the purchase price paid and the amounts of assets acquired and liabilities assumed for the CoreSite Acquisition based upon its estimated fair value at the date of acquisition. Balances are reflected in the accompanying consolidated balance sheet as of September 30, 2022.

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|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  | Preliminary Allocation |  | Updated Allocation |
| Current assets |  | $ | 99.8  |  |  | $ | 99.6  |  |
|  |  |  |  |  |
| Property and equipment |  | 5,129.0  |  |  | 5,289.5  |  |
| Intangible assets (1): |  |  |  |  |
|      Tenant-related intangible assets |  | 665.0  |  |  | 655.0  |  |
|      Network location intangible assets |  | —  |  |  | —  |  |
|      Other intangible assets |  | 1,709.0  |  |  | 1,636.3  |  |
| Other non-current assets |  | 332.9  |  |  | 330.1  |  |
| Current liabilities |  | (156.6) |  |  | (154.8) |  |
| Deferred tax liability |  | —  |  |  | —  |  |
| Other non-current liabilities |  | (323.1) |  |  | (340.6) |  |
| Net assets acquired |  | 7,456.0  |  |  | $ | 7,515.1  |  |
| Goodwill  |  | 2,943.3  |  |  | 2,884.2  |  |
| Fair value of net assets acquired |  | 10,399.3  |  |  | 10,399.3  |  |
| Debt assumed |  | (955.1) |  |  | (955.1) |  |
|  |  |  |  |  |
| Purchase price |  | $ | 9,444.2  |  |  | $ | 9,444.2  |  |

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_(1)Tenant-related intangible assets are amortized on a straight-line basis over a 10 year period. Other intangible assets are amortized on a straight-line basis over the estimated useful lives of the assets.Pro Forma Consolidated Results (Unaudited) The following table presents the unaudited pro forma financial results as if the 2022 acquisitions had occurred on January 1, 2021 and the 2021 acquisitions had occurred on January 1, 2020. The pro forma results, to the extent available, are based on historical information, and accordingly may not fully reflect the current operations of the acquired business. In addition, the pro forma results do not include any anticipated cost synergies, costs or other integration impacts. Accordingly, such pro forma amounts are not necessarily indicative of the results that actually would have occurred had the transactions been completed on the dates indicated, nor are they indicative of the future operating results of the Company.

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|  |  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
|   |  | 2022 |  | 2021 |  | 2022 |  | 2021 |
| Pro forma revenues |  | $ | 2,671.9  |  |  | $ | 2,638.7  |  |  | $ | 8,011.7  |  |  | $ | 7,749.4  |  |
| Pro forma net income attributable to American Tower Corporation common stockholders |  | $ | 839.4  |  |  | $ | 574.6  |  |  | $ | 2,449.2  |  |  | $ | 1,708.9  |  |
| Pro forma net income per common share amounts: |  |  |  |  |  |  |  |  |
| Basic net income attributable to American Tower Corporation common stockholders |  | $ | 1.80  |  |  | $ | 1.24  |  |  | $ | 5.26  |  |  | $ | 3.68  |  |
| Diluted net income attributable to American Tower Corporation common stockholders |  | $ | 1.80  |  |  | $ | 1.23  |  |  | $ | 5.25  |  |  | $ | 3.67  |  |

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