AT&T INC. business relationships

“Gigapower We hold a 50 % interest in our joint venture Gigapower, LLC (Gigapower), which provides a fiber network in select areas to internet service providers and other businesses across the United States.” SEC filing

“• announced complimentary high-speed Wi-Fi sponsored by AT&T, exclusive to our AAdvantage members, which became effective in January 2026 on our narrowbody and dual-class regional fleets and will be available on nearly every American Airlines flight by spring 2026;” SEC filing

“Furthermore, ChargePoint depends on connectivity from its charging stations to its data centers through several cellular service providers, such as Verizon, AT&T, Vodafone, and Semtech Corporation.” SEC filing

“| | ● | | communications service providers, such as AT&T and Verizon; |” SEC filing

“Our largest broadband service providers include AT&T.” SEC filing

“In 2019, we launched our mobile service using our own core infrastructure and our iMVNO agreements with Sprint (now T-Mobile) and other roaming partners, including AT&T.” SEC filing

“...rvices to over two-thirds of the households in our footprint in New York, New Jersey, and Connecticut combined and that AT&T and other fiber-based service providers are able to sell fiber products to approximately half of the households in various markets in our south-central United States service a...” SEC filing

“Sales to AT&T were $500.7 million, or 10.5% of total revenue, in fiscal 2025, and $475.3 million, or 11.8% of total revenue, in fiscal 2024.” SEC filing

“AT&T purchased products and services from each of Ciena's operating segments for each of the periods presented.” SEC filing

“Our products utilize many of the world's leading telecommunications companies and Internet service providers, including, among others, AT&T, T-Mobile and Verizon.” SEC filing

“AT&T accounted for 25.9% and 24.5% of our revenue in fiscal years 2025 and 2024, respectively.” SEC filing

“In October 2021, we entered into a Restated and Amended Master Services and Software License Agreement with AT&T Services, Inc., as amended, which amends and restates the Master Services Agreement, as amended, that we entered into with AT&T Services, Inc. in February 2017.” SEC filing

“On May 21, 2025, we and certain of our affiliates entered into a definitive agreement to sell to AT&T the Lumen Mass Markets Fiber-to-the-Home business, operated by us and certain of our affiliates in 11 states (the "Territory") for $ 5.75 billion in cash, subject to working capital and other negoti...” SEC filing

“Examples of our customers include Advanced Micro Devices, Inc., América Móvil, AT&T Inc., British Telecom Openreach, Ciena, Cisco Systems, Inc., Deutsche Telekom AG, Ericsson, Lumen Technologies, Inc., Nokia Corporation and Verizon Communications Inc.” SEC filing

“Our largest tenants are T-Mobile, AT&T and Verizon Wireless, which collectively accounted for approximately 90% of our 2025 site rental revenues.” SEC filing

“We have the option to purchase these towers from AT&T at the end of their respective lease terms for aggregate option payments of up to approximately $373 million as of December 31, 2025, which payments, if such option is exercised, would be due prior to 2032 (less than $5 million would be due befor...” SEC filing

“We will need to raise additional capital in the future if the AT&T Transactions and SpaceX Transactions are not completed, which may not be available on favorable terms or at all, to, among other things, make any potential Northstar Re-Auction Payment and SNR Re-Auction Payment for the AWS-3 license...” SEC filing

“interexchange carriers and other long-distance resellers and providers, including large carriers such as T-Mobile, AT&T, and Verizon;” SEC filing

“These devices, sold under the Wavemaker brand, are sold by mobile operators such as T-Mobile, Verizon Wireless, and AT&T along with distribution and channel partners.” SEC filing

“We intend to continue diversifying our customer base, a recent example of which is the inclusion of our FX4200 5G FWA device in AT&T Business's device offerings.” SEC filing

“Even if we succeed, additional testing and operational certifications will be required by the OEMs' customers, which include large Pay-TV television companies such as Comcast Corporation, Liberty Global plc, Charter Communications, Inc., Sky UK Limited, AT&T Inc. and EchoStar Corporation.” SEC filing

“ We rely, in part, on AT&T for distribution of our services to FirstNet® customers.” SEC filing

“In addition to our relationship with FirstNet®, built with AT&T, and our public safety offerings, we are continuing to grow our E911 service, including with Verizon, and have licensed our technology to device manufacturers operating on other nationwide wireless carriers.” SEC filing

“Our Pinnacle solution, launched in partnership with AT&T Services, Inc. ("AT&T") as part of its FirstNet ® initiative, can provide accurate altitude service to any device with a barometric pressure sensor and covers over 90% of commercial structures over three stories in the U.S. Our Pinnacle system...” SEC filing

“Our Pinnacle network infrastructure is dependent on a hosting arrangement with AT&T.” SEC filing

“With our advanced deployment with customers such as AT&T, Rakuten and Dish, and our position” SEC filing

“We provide products and services from approximately 500 suppliers, including key suppliers AT&T, Avaya, Axis, Cisco, Comcast Business, Dell, Elo, Extreme, Five9, Fortinet, Hanwha, Honeywell, HP Poly, HPE/Aruba, HPE/Juniper, Ingenico, Lumen, Microsoft, NiCE, RingCentral, Ubiquiti, Verifone, Verizon,...” SEC filing

“Wireless Service Bundle: Residential customers can bundle their Kinetic broadband service with a post-paid wireless service plan with AT&T.” SEC filing

“We rely on wireless carriers, mainly AT&T and Verizon, to provide access to wireless networks for machine-to-machine data transmissions, which are an integral part of our services.” SEC filing

“We also have roaming agreements with each of the three US national wireless network carriers (AT&T, T-Mobile, and Verizon) along with several other wireless service providers.” SEC filing

“As of December 31, 2025 notable customers of the ClearanceJobs and Dice businesses included AT&T, Adecco, CACI, Cisco, Capital One, General Dynamics, Kforce, Microsoft, and Northrop Grumman.” SEC filing

“For the year ended December 31, 2025, our top four customers by total revenue were T-Mobile (18%), AT&T (17%), Verizon Wireless (14%) and Telefónica (10%).” SEC filing

“with AT&T Inc. (AT&T) provides Bell Canadian business customers with access to AT&T's LTE-M network across the U.S. and also enables AT&T's customers to roam on Bell's” SEC filing

“For instance, in July 2022, we announced a partnership with the Dallas Cowboys, featuring product placement at AT&T Stadium.” SEC filing

“loss of significant customers, including AT&T and Verizon Wireless; |” SEC filing

“In addition to the Big 3 wireless carriers (T-Mobile, AT&T Wireless, Verizon Wireless), we also provided services or leased space to a number of other customers during 2025 including:” SEC filing

“Recently, the U.S. wireless service provider market has reduced to three nationwide wireless service providers, AT&T Wireless, T-Mobile, and Verizon Wireless, and our dependence on these three wireless service providers for our financial and operational growth has been exacerbated.” SEC filing

“August 2024, the Company entered into an MVNx Reseller Agreement (the "AT&T Agreement") with AT&T Mobility LLC ("AT&T"),” SEC filing

“pursuant to which the Company purchases wholesale wireless network services from AT&T for resale to the Company's end users under” SEC filing

“many of which are our vendors, are: Verizon, AT&T, CenturyLink, IBM and Cisco Resellers, small regional IT integrators and large company” SEC filing

“We have developed relationships with companies, such as Vodafone, Rakuten, AT&T, Verizon, Google, American Tower, STC, Bell Canada and others that have innovative technologies and products, skilled personnel, and potential end-user customers that complement our strategy.” SEC filing

“...on (the "Modification Application") with the FCC requesting authority to adjust the technical parameters of our planned satellite constellation and add frequencies licensed to Verizon, AT&T, and FirstNet to provide Supplemental Coverage from Space ("SCS") in the continental United States and Hawaii.” SEC filing

“The contract relationship includes five purchase orders to deliver networking services to AT&T and its clients.” SEC filing

“Furthermore, we depend on connectivity from our charging stations to our data centers through cellular service and virtual private networking providers, such as AT&T and Verizon.” SEC filing