Press Release

 Harmonic's Converged Broadband Solution Supports Internet Provider's
Expansion Efforts  

SAN JOSE, Calif., Sept. 29, 2025 /PRNewswire/ -- Harmonic (NASDAQ: HLIT) and Comcast are joining forces to expand fiber broadband access as the Internet provider continues to expand its network into new markets. In 2024, Comcast expanded its network to more than one million new locations, with more than 1.2 million new locations planned by the end of 2025. Comcast is leveraging Harmonic's industry-leading cOS™ virtualized broadband platform and network edge devices as an integral part of its efforts to deliver multi-gigabit symmetrical broadband with low-lag to residential and commercial customers.

"We are rapidly expanding our network to new areas and by leveraging Harmonic's cOS platform provides us with the flexibility to use fiber or extend our existing DOCSIS-based infrastructure to deliver critical connectivity to homes and businesses," said Dan Rice, vice president of Access Engineering, Comcast. "Introducing multi-gigabit Internet with low lag will open up a new world of opportunities for these areas and our ecosystem of partners like Harmonic is instrumental in making that possible."

The expansion of Comcast's network enables rapid and cost-effective deployment of fiber-based services that seamlessly co-exist with coax-based offerings on the same virtualized broadband platform supporting cost-effective fiber rollouts to rural communities, including through BEAD-funded projects. Harmonic's cOS platform provides Comcast with a converged solution for multi-gigabit services, simplifying operations, reducing costs and enabling the strategic deployment of the node-based remote switches and optical line terminals (OLT) that connect customers to Comcast's network. These innovations are supported by Harmonic's virtual Broadband Network Gateway (vBNG) and Jetty Remote Switch with Fin Remote OLT in Harmonic's Ripple DAA node.

"Our partnership with Comcast is consistently driving industry progress. Comcast and Harmonic are leading the broadband industry implementing new solutions that allow networks to be expanded quickly and at scale," said Asaf Matatyaou, senior vice president, product at Harmonic. "Together, we are demonstrating how DOCSIS and fiber can seamlessly co-exist on a virtualized broadband platform to deliver multi-gigabit speeds, ultra-low latency and exceptionally reliable connectivity to more communities."

Harmonic is the market share leader in cable broadband equipment, virtual CMTS and DAA, according to Dell'Oro Group, the trusted source for market information about the telecommunications, networks and data center IT industries. The company's market-leading cOS platform powers next-gen broadband services through more than 35 million customer CPE devices worldwide for leading operators in North America, Europe, Latin America and Asia. 

Harmonic will demonstrate the latest advancements to the cOS virtualized broadband platform at SCTE TechExpo25, Sept. 29-Oct.1 in booth H1065. To schedule a meeting with Harmonic, visit www.harmonicinc.com/scte-2025. To learn more about the company's broadband solutions, visit www.harmonicinc.com/broadband.

About Harmonic
Harmonic (NASDAQ: HLIT), the worldwide leader in virtualized broadband and video delivery solutions, enables media companies and service providers to deliver ultra-high-quality video streaming and broadcast services to consumers globally. The company revolutionized broadband networking via the industry's first virtualized broadband solution, enabling operators to more flexibly deploy gigabit internet services to consumers' homes and mobile devices. Whether simplifying OTT video delivery via innovative cloud and software platforms, or powering the delivery of gigabit internet services, Harmonic is changing the way media companies and service providers monetize live and on-demand content on every screen. More information is available at www.harmonicinc.com. 

Legal Notice Regarding Forward-Looking Statements
 This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Statements concerning Harmonic's business and the anticipated capabilities, advantages, reliability, efficiency, market acceptance, market growth, specifications and benefits of Harmonic products, services and technology are forward-looking statements. These statements are based on our current expectations and beliefs and are subject to risks and uncertainties, including the risks and uncertainties more fully described in Harmonic's filings with the Securities and Exchange Commission, including its Annual Report on Form 10-K for the year ended Dec. 31, 2024, its Quarterly Reports on Form 10-Q and its Current Reports on Form 8-K. The forward-looking statements in this press release are based on information available to Harmonic as of the date hereof, and Harmonic disclaims any obligation to update any forward-looking statements.

Harmonic, the Harmonic logo and other Harmonic marks are owned by Harmonic Inc. or its affiliates. All other trademarks referenced herein are the property of their respective owners.

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SOURCE Harmonic Inc.

Netra Ghosh, Corporate Communications Manager, +1 425-215-5525, netra.ghosh@harmonicinc.com; David Hanover, KCSA Strategic Communications, Investor Relations, +1 212-896-1220, investor@harmonicinc.com