Finding companies with a long growth runway is how you identify stocks that can make you a fortune. But the market won't give you these returns for free. Volatility is the price you pay for monster returns over time, and this will undoubtedly be the case for two companies we'll look at below.
That said, Bitcoin miner Hut 8 (HUT +16.45%) and language-training platform Duolingo (DUOL +3.53%) are experiencing robust growth that, if sustained, could deliver wealth-building returns over the next decade and beyond that have the potential to make you a millionaire.
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1. Hut 8
After several years of volatility for shareholders, Hut 8 saw its stock price more than double over the past year. This comes amid its pivot to meet the demand for data centers.
Morgan Stanley estimates that corporate spending on artificial intelligence (AI) could hit $10 trillion over time. Savvy investors know that chip stocks are not the only way to profit from AI -- data centers are in short supply, prompting several Bitcoin miners to leverage their infrastructure to address this need.
Hut 8 has a pipeline of over 9 gigawatts worth of data center capacity that it can monetize to drive significant growth for shareholders. It signed a $7 billion deal in December to supply 245 megawatts for Anthropic, the developer of the AI large language model (LLM) Claude. The value of this deal could reach $17.7 billion if all contract options are exercised.
NASDAQ: HUT
Key Data Points
The main risks for Hut 8 are construction delays on its data center buildout. However, Hut 8 wouldn't have been able to gain financial partnerships with Google, JPMorgan, and Goldman Sachs if it couldn't demonstrate its ability to execute on the Anthropic deal.
Analysts expect Hut 8's revenue to rise 48% for 2025, before increasing by 76% in 2026 to reach $425 million. The company's $6.6 billion market cap appears conservative relative to the long-term value of its data center pipeline, setting the stage for significant upside.
2. Duolingo
Duolingo's fast-growing mobile education app is tapping into the $5 trillion global education market. Spending on AI-powered education technology is expected to drive this market over the long term. With the stock well off its highs, many investors are unaware of Duolingo's advantages that could help them capitalize on this opportunity.
NASDAQ: DUOL
Key Data Points
The company is using AI in the background that adapts to its users. In the future, Duolingo plans to use AI to iterate more quickly on launching new content on its platform. This can not only benefit its growth, but also drive down costs and improve profitability.
If AI models like ChatGPT are going to steal users away from Duolingo, it's not showing up in the numbers. Duolingo reported a 36% year-over-year increase in daily active users in the third quarter. Duolingo has spent years perfecting its platform to deliver the best learning experience, a key differentiator against rivals.
In 2025, the University of Hawaii National Foreign Language Resource Center published a study that showed Spanish learners on Duolingo outpaced classroom students in English proficiency. Duolingo's investments in AI will only improve the experience and drive more growth.
The company has a market cap of $6 billion, leaving ample upside for the stock to compound as it captures a larger share of a multitrillion-dollar education market.
