-- CoreSite Chosen as a Finalist for their Innovation: Open Cloud Exchange^® --

CoreSite, a leading hybrid IT solutions provider and subsidiary of American Tower Corporation (NYSE: AMT) (“American Tower”), today announced that it was selected as a finalist in the 2023 Eye on Innovation Awards for Communication Service Providers for the Americas region. The Open Cloud Exchange^® (OCX) was among the finalists for the award which “recognizes communications service providers (CSPs) for their innovative use of technology to drive best-in-class initiatives. All submissions are assessed by Gartner, and finalists are selected via benchmarking against world-class performance standards. Winners are selected at our annual awards ceremonies in three regions: APAC, EMEA and the Americas.”¹

Profiles of the judges and additional information, including videos from all the finalists and all the regions, are available on the Gartner website: https://www.gartner.com/en/about/awards/communications-eye-on-innovation.

¹ Gartner, 2023 Gartner Eye on Innovation Awards for Communications Service Providers, https://www.gartner.com/en/about/awards/communications-eye-on-innovation

GARTNER is a registered trademark and service mark of Gartner, Inc. and/or its affiliates in the U.S. and internationally and is used herein with permission. All rights reserved. The identification of a Gartner award winner or finalist is not an endorsement by Gartner of any company, vendor, product or service.

About CoreSite

CoreSite, an American Tower company (NYSE: AMT), provides hybrid IT solutions that empower enterprises, cloud, network, and IT service providers to monetize and future-proof their digital business. Our highly interconnected data center campuses offer a native digital supply chain featuring direct cloud onramps to enable our customers to build customized hybrid IT infrastructure and accelerate digital transformation. For more than 20 years, CoreSite’s team of technical experts has partnered with customers to optimize operations, elevate customer experience, dynamically scale, and leverage data to gain competitive edge. For more information, visit CoreSite.com and follow us on LinkedIn and Twitter.

Forward-Looking Statements

This press release contains statements about future events and expectations, or “forward-looking statements,” all of which are inherently uncertain. We have based those forward-looking statements on management’s current expectations and assumptions and not on historical facts. These forward-looking statements involve a number of risks and uncertainties. For important factors that may cause actual results to differ materially from those indicated in our forward-looking statements, we refer you to the information contained in Item 1A of American Tower’s Form 10-K for the year ended December 31, 2022, as updated in its Form 10-Q for the six months ended June 30, 2023, each under the caption “Risk Factors” and in other filings American Tower makes with the Securities and Exchange Commission. Neither we nor American Tower undertake any obligation to update the information contained in this press release to reflect subsequently occurring events or circumstances.

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