ADTRAN Holdings Inc (NASDAQ: ADTN) is a networking and communications equipment company that designs and sells broadband access and optical networking hardware and software to telecommunications service providers. Revenue comes from equipment sales and software and services, sold primarily to telephone companies, cable operators, and utilities. The 10-K filed 2026-02-26 (accession 0001193125-26-073878) covers the fiscal year ended December 31, 2025, but the filing excerpts provided contain only administrative and cover-page text and do not supply segment revenue figures, customer concentration data, geographic mix, named competitors, or other operational specifics. Based solely on the available filing excerpts, no further factual detail about ADTRAN's revenue breakdown, market position, headcount, or capital structure can be stated.

Source: SEC 10-K, filed 2026-02-26

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