September 2025's Leading Growth Companies With Insider Ownership

As U.S. stock indexes experience a pullback for the third consecutive session amid anticipation of key inflation data, investors are keeping a close eye on economic indicators and their potential impact on market dynamics. In this environment, growth companies with high insider ownership can be particularly appealing, as they often signal strong confidence from those closest to the business and may offer resilience during fluctuating market conditions.

Top 10 Growth Companies With High Insider Ownership In The United States

Click here to see the full list of 201 stocks from our Fast Growing US Companies With High Insider Ownership screener.

Let's uncover some gems from our specialized screener.

Clearfield (CLFD)

Simply Wall St Growth Rating: ★★★★☆☆

Overview: Clearfield, Inc. manufactures and sells various fiber connectivity products both in the United States and internationally, with a market cap of $475.20 million.

Operations: The company generates revenue through its segments, with $145.33 million from Clearfield and $36.06 million from Nestor Cables.

Insider Ownership: 17.4%

Clearfield, Inc. demonstrates significant growth potential with earnings projected to rise substantially above the US market average. The company recently became profitable, reporting a net income of US$1.61 million for Q3 2025 versus a loss in the previous year. Despite trading below estimated fair value, analysts expect its stock price to increase by nearly 45%. Clearfield's addition to multiple Russell Growth Benchmarks underscores its prominence among growth companies in the United States.

• Get an in-depth perspective on Clearfield's performance by reading our analyst estimates report here.
• Our valuation report unveils the possibility Clearfield's shares may be trading at a discount.

WK Kellogg Co (KLG)

Simply Wall St Growth Rating: ★★★★☆☆

Overview: WK Kellogg Co is a food company operating in the United States, Canada, Mexico, and the Caribbean with a market cap of approximately $1.99 billion.

Operations: The company's revenue primarily comes from the manufacturing, marketing, and sales of cereal products, totaling $2.61 billion.

Insider Ownership: 12.2%

WK Kellogg Co's earnings are forecast to grow significantly at 35% per year, outpacing the US market. Despite this growth potential, revenue is expected to decline by 0.4% annually over the next three years. The company trades at a substantial discount to its estimated fair value and has recently been added to several Russell Value Benchmarks. However, profit margins have decreased and dividends are not well covered by earnings or cash flow, indicating financial challenges ahead.

• Click to explore a detailed breakdown of our findings in WK Kellogg Co's earnings growth report.
• According our valuation report, there's an indication that WK Kellogg Co's share price might be on the expensive side.

Similarweb (SMWB)

Simply Wall St Growth Rating: ★★★★★☆

Overview: Similarweb Ltd. offers digital data and analytics services to support critical business decisions globally, with a market cap of $817.27 million.

Operations: The company's revenue is primarily generated from its online financial information providers segment, which amounts to $268.35 million.

Insider Ownership: 14.7%

Similarweb is poised for growth with its innovative AI infrastructure tool, the MCP Server, which integrates digital insights into AI platforms, enhancing decision-making capabilities. Despite a net loss of US$11.85 million in Q2 2025, revenue increased to US$70.97 million from the previous year. The company forecasts annual revenue growth of 14.5%, surpassing the US market average. Recent executive changes include a planned CFO departure and a new board member appointment, indicating strategic shifts amidst its expansion efforts.

• Unlock comprehensive insights into our analysis of Similarweb stock in this growth report.
• The valuation report we've compiled suggests that Similarweb's current price could be quite moderate.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.The analysis only considers stock directly held by insiders. It does not include indirectly owned stock through other vehicles such as corporate and/or trust entities. All forecast revenue and earnings growth rates quoted are in terms of annualised (per annum) growth rates over 1-3 years.