20 Small-Cap Stocks Built to Turn $1 Into $100

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Most investors believe they are pursuing growth. What they are actually doing is reacting to noise, chasing momentum, and paying up for whatever narrative is dominating the headlines this week. That is not growth investing. That is speculation with better marketing.

Thomas William Phelps approached the market very differently. In 100 to 1 in the Stock Market, he did not start with theories, factor models, or macro forecasts. He started with outcomes. He studied companies that had actually turned $1 into $100 or more and asked a simple question. What did these businesses have in common?

The answer was not low valuation. It was not clever trading. It was not timing the market.

It was compounding driven by reinvestment.

Here's what he meant - and 20 stocks that fit the bill today.

Phelps found that the greatest winners in the stock market shared a small set of critical characteristics. They operated in industries with long growth runways. They generated high returns on capital, often well above the cost of capital. More importantly, they had the ability to reinvest incremental earnings at similarly high rates. That last point is the entire secret. A company that earns 20% on capital but has nowhere to deploy additional capital will not compound. A company that can redeploy that capital internally for years or decades will.

He also emphasized management. The great compounders were not run by empire builders or financial engineers. They were run by disciplined capital allocators who understood where to invest, when to pull back, and how to grow without destroying returns. Many of these companies expanded through product innovation, geographic growth, or carefully executed acquisitions that enhanced rather than diluted returns.

Perhaps the most important lesson in the book is behavioral. Investors consistently sell too early. A stock doubles and they take a profit. It triples and they congratulate themselves. Meanwhile, the real money is made in the fifth, sixth, and seventh doubling, when compounding begins to accelerate. Phelps made it clear that the biggest obstacle to extraordinary returns is not finding the right stock. It is having the patience to hold it.

This framework runs directly against the grain of modern markets. Today’s environment rewards activity, constant information consumption, and reaction. Phelps rewards inaction and discipline.

With that in mind, I built a screen designed to identify modern versions of these businesses. The focus is on small to mid-cap companies, generally between $300 million and $5 billion, where institutional ownership is not yet overwhelming and inefficiencies still exist. The filters emphasize high returns on invested capital, consistent revenue and earnings growth, strong free cash flow generation, and balance sheet discipline. I layered in a valuation component because paying any price for growth reduces future returns, and I prefer situations where insider ownership is meaningful.

What follows is not a list of stocks to chase. It is a working inventory of reinvestment machines. These are businesses that, today, exhibit many of the traits Phelps identified. The opportunity is not in buying them all. The opportunity is in understanding them, tracking them, and acting when price and value diverge.

The first group consists of industrial and infrastructure businesses. These are the types of companies that rarely make headlines but often deliver the most reliable compounding.

CSW Industrials $CSWI ( ▼ 0.95% ) operates a portfolio of niche industrial businesses focused on HVAC, plumbing, and specialty chemicals. The company has built its growth strategy around disciplined acquisitions, targeting small, high-margin businesses that can be integrated and scaled. Returns on capital have remained strong, and free cash flow generation is consistent. The real attraction is the runway. CSW has multiple verticals into which it can deploy capital, allowing it to compound through both organic growth and acquisitions.

Kadant $KAI ( ▲ 0.77% ) is a classic example of a hybrid model that combines equipment sales with recurring consumables and parts. This creates a base of steady cash flow layered on top of cyclical capital spending. Over time, the consumables segment has grown in importance, improving margins and stability. Kadant has reinvested consistently in product development and acquisitions, producing a steady compounding of earnings and returns on capital.

Atkore $ATKR ( ▲ 1.4% ) sits at the intersection of electrification, infrastructure spending, and data center expansion. The business generates substantial free cash flow, which management has deployed through acquisitions and share repurchases. Returns on invested capital are strong, and the company benefits from both cyclical recovery and long-term secular demand. The ability to reinvest capital across multiple product lines supports continued growth.

Simpson Manufacturing $SSD ( ▲ 0.54% ) has built a dominant position in structural connectors and engineered building products. Its brand is deeply embedded with builders and engineers, creating a form of pricing power that is difficult to dislodge. The company consistently generates high returns on capital and reinvests in product innovation and geographic expansion. Over time, this has produced steady growth in both earnings and intrinsic value.

UFP Industries $UFPI ( ▼ 0.72% ) has undergone a significant transformation from a commodity lumber processor into a diversified manufacturer of value-added products. This shift has improved margins, reduced cyclicality, and expanded reinvestment opportunities. The company generates strong free cash flow and has a long history of deploying capital through acquisitions and internal expansion.

Limbach Holdings $LMB ( ▼ 0.54% ) represents a business in transition. Historically focused on construction, it is moving toward higher-margin service and systems work. This shift is improving returns on capital and creating a more recurring revenue base. As the transformation continues, the company should have greater ability to reinvest internally and compound earnings.

Comfort Systems USA $FIX ( ▲ 1.01% ) has built a strong position in mechanical contracting and services, with increasing exposure to data centers and complex infrastructure projects. The company generates consistent cash flow and reinvests through acquisitions that expand its capabilities and geographic reach. Returns on capital have been attractive, and the backlog provides visibility into continued growth.

AZZ $AZZ ( ▼ 2.62% ) operates in specialized coating and infrastructure markets where competition is limited. The business produces steady cash flow, which is reinvested into acquisitions and operational improvements. Its niche positioning supports durable margins and attractive returns on capital.

The next group consists of asset-light service and consulting businesses, where capital requirements are low and incremental returns are high.

ePlus $PLUS ( ▼ 1.42% ) provides enterprise IT infrastructure and services, including cloud, security, and hardware solutions. The model is relatively asset-light, with growth driven by customer relationships and service expansion. The company has compounded earnings through a mix of organic growth and acquisitions, maintaining solid returns on capital.

Hackett Group $HCKT ( ▼ 9.57% ) focuses on benchmarking, advisory, and increasingly AI-driven consulting services. Its client relationships are long-term in nature, and its capital requirements are minimal. This allows the company to generate high margins and reinvest in expanding its service offerings.

Exponent $EXPO ( ▼ 4.79% ) operates in highly specialized engineering and scientific consulting niches. Its expertise creates strong barriers to entry, while its client relationships support recurring demand. The company generates consistent free cash flow and reinvests in talent, which is the primary driver of growth.

Heidrick & Struggles $HSII ( ▲ 0.08% ) provides executive search and leadership advisory services. While somewhat cyclical, the business is capital-light and generates attractive returns over time. Its expansion into advisory services provides an additional avenue for reinvestment.

The third group includes specialty manufacturers and niche leaders.

Encore Wire $WIRE ( ▲ 0.02% ) benefits from a vertically integrated model that provides cost advantages and operational efficiency. Demand is supported by electrification and infrastructure trends, and the company generates strong margins and free cash flow. Its ability to reinvest in capacity and efficiency supports continued growth.

Mueller Industries $MLI ( ▲ 0.92% ) produces a wide range of metal-based products used across multiple end markets. The company has maintained consistent profitability and disciplined capital allocation, allowing it to compound value over time.

Park Aerospace $PKE ( ▲ 1.73% ) focuses on high-performance materials used in aerospace applications. The business benefits from long product cycles and strong customer relationships, supporting stable margins and steady reinvestment opportunities.

RBC Bearings $RBC ( ▲ 1.02% ) has built a leading position in highly engineered components. The company combines organic growth with acquisitions, generating strong returns on capital and benefiting from pricing power in critical applications.

Consumer and brand-driven compounders remain essential to the Phelps framework.

MGP Ingredients $MGPI ( ▼ 0.88% ) is transitioning toward higher-margin branded products, improving its overall economics and reinvestment profile. The company continues to invest in brand development and production capabilities.

WD-40 Company $WDFC ( ▼ 2.1% ) is a classic global brand compounder. Its flagship product enjoys strong recognition and pricing power, allowing the company to generate high margins with minimal capital investment. Growth is driven by geographic expansion and product extensions.

Finally, there are capital-light financial operators that resemble compounders without traditional balance sheet risk.

Kinsale Capital Group $KNSL ( ▼ 0.31% ) operates in excess and surplus insurance markets, where disciplined underwriting produces high returns on equity. The company has consistently grown premiums, earnings, and book value, reinvesting at attractive rates.

Ryan Specialty $RYAN ( ▼ 3.65% ) provides brokerage and specialty insurance services with a capital-light model. Growth is driven by relationships and market expansion, allowing the company to scale efficiently and reinvest in its platform.

These companies do not look alike. They are not supposed to.

What ties them together is the ability to earn high returns on capital and redeploy those returns internally over long periods of time. That is the essence of the Phelps framework.

The market is very good at pricing obvious growth. It is far less effective at recognizing businesses that can quietly compound for a decade or more without attracting attention.

That is where the opportunity is.

The job is not to predict. The job is to identify the reinvestment machines, wait for the right price, and then do the one thing most investors cannot do.

Hold on.

The results you will see with these 20 stocks, over time, should be very good.

If you want “great” instead, take a look at my four favorite strategies.