Thomas Seifert
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Thomas Seifert is the Chief Financial Officer of Cloudflare, where he oversees the company's finance organization. Before joining Cloudflare, he served as Chief Financial Officer of Vonage Holdings. Earlier in his career he was Chief Financial Officer of Advanced Micro Devices (AMD), a role in which he also served a stint as interim Chief Executive Officer. He has held senior finance leadership positions across the semiconductor and communications technology sectors over a career spanning multiple public companies.
Updated 5 August 2026
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