System1 (SST) Common Stock to Begin Trading on a Split-Adjusted Basis on June 12, 2025

System1, Inc. (NYSE: SST) (“System1” or the “Company”), an omnichannel customer acquisition marketing platform, previously announced on June 10, 2025, that the Company’s board of directors has approved a reverse stock split (the “Reverse Stock Split”) of all of its issued and outstanding Class A Common Stock, par value $0.0001 per share (“Class A Common Stock”) and Class C Common Stock, par value $0.0001 per share (“Class C Common Stock”, and together with the Class A Common Stock, the “Common Stock”) at a ratio of one post-split share for every ten shares, effective at 5:00 p.m. Eastern Time on June 11, 2025 (the “Effective Time”). The Company’s Class A Common Stock is expected to begin trading on the split-adjusted basis on the New York Stock Exchange (the “NYSE”) when the stock markets open on June 12, 2025, under the existing trading symbol “SST,” with a new CUSIP number of 87200P 208.

Michael Blend, Chairman and CEO of System1, commented, “Today’s reverse stock split is a customary and necessary step to regain compliance with NYSE listing standards. We remain confident in our long-term strategy and are committed to delivering value to our shareholders through the advancement of our strategic priorities.”

Reverse Stock Split Implementation

As a result of the Reverse Stock Split, every 10 shares of Common Stock outstanding and held of record by each stockholder of the Company, including treasury shares, were reclassified into one (1) new share of Common Stock. The Reverse Stock Split reduced the number of issued and outstanding shares of the Company’s Class A Common Stock from 79.8 million to 7.98 million and the number of issued and outstanding shares of the Company’s Class C Common Stock from 18.7 million to 1.87 million.

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