Why SentinelOne (S) Stock Is Down Today

September 08, 2025 at 14:26 PM EDT

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What Happened?

Shares of cybersecurity AI platform provider SentinelOne (NYSE: S) fell 1.9% in the afternoon session after the company announced its intent to acquire Observo AI, a data streaming platform, for approximately $225 million.

The consideration for the deal will be a combination of cash and company stock. This news comes shortly after SentinelOne completed another acquisition, purchasing Prompt Security, Inc. for about $180 million on September 5, 2025. Investors may be reacting to the combined cost of over $400 million for the two recent acquisitions and the potential for share dilution from the stock-based portion of the payments. While SentinelOne stated the Observo AI deal will complement its fast-growing AI SIEM and data offerings, the back-to-back acquisitions appear to have created some concern in the market.

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What Is The Market Telling Us

SentinelOne’s shares are very volatile and have had 21 moves greater than 5% over the last year. In that context, today’s move indicates the market considers this news meaningful but not something that would fundamentally change its perception of the business.

The previous big move we wrote about was 6 days ago when the stock dropped 6% on the news that the major indices continued to retreat amid profit-taking and renewed concerns about tariffs. Investors reacted to a federal court ruling that most of President Trump's global tariffs were illegal, raising uncertainty over trade policy and the fiscal impact of potential refunds. Rising Treasury yields added to the pressure, with the 10-year climbing above 4.2% and the 30-year nearing 5%, intensifying worries about stretched equity valuations. September's historically weak track record for stocks further dampened sentiment, leaving traders cautious ahead of the jobs report later in the week and the Federal Reserve's upcoming rate decision.

SentinelOne is down 18.2% since the beginning of the year, and at $18.47 per share, it is trading 35.6% below its 52-week high of $28.68 from December 2024. Investors who bought $1,000 worth of SentinelOne’s shares at the IPO in June 2021 would now be looking at an investment worth $434.47.

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Why SentinelOne (S) Stock Is Down Today

What Happened?

What Is The Market Telling Us

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