System1, Inc.

For the period ended Jun 11, 2025. Filed Jun 11, 2025.

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A notice of a major event between regular reports, such as results, a deal or a change of executives. It is often the first formal record of the news.

Jun 11, 2025 · Filed Jun 11, 2025

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SST$1.72-2.8%Stored close · as of Nov 6, 2026

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Contents

EX-99.1 · Additional Information

Additional Information

Additional information about the reverse stock split can be found in the Company’s definitive proxy statement on Schedule 14A filed with the Securities and Exchange Commission (the “SEC”) on May 19, 2025, which is available on the SEC’s website, www.sec.gov, and on the “Investors” section of the Company’s website at https://ir.system1.com/overview/default.aspx, or the Company’s Current Report on Form 8-K filed on June 10, 2025.

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