Exhibit 99.1 System1 Announces Strong First Quarter 2025 Financial Results All Key Financial Results At or Above the High-End of Guidance Range LOS ANGELES, CA – May 6, 2025 – System1, Inc. (NYSE: SST) ("System1" or the "Company"), an omnichannel customer acquisition marketing platform, today announced its financial results for the first quarter of 2025. "We are pleased to report another solid quarter where our key financial metrics were all above the high end of our guidance for the period," commented Mich ...