Sifting through countless of stocks in the Machinery industry can be tedious, and sometimes two stocks are just too similar to judge which is the better investment. If you’re on the fence about investing in Kadant Inc., Proto Labs or Inc. because you’re not sure how they measure up, it’s important to compare them on a few factors before making your decision.

Read on to learn how Kadant Inc., Proto Labs and Inc. compare based on key financial metrics to determine which better meets your investment needs.

About Kadant Inc., Proto Labs and Inc.

Kadant Inc. supplies technologies and engineered systems worldwide. The company operates through three segments: Flow Control, Industrial Processing, and Material Handling. The Flow Control segment develops, manufactures, and markets fluid-handling systems, equipment, and integrated technologies, such as rotary joints, syphons, Turbulator bars, expansion joints, and engineered steam and condensate systems, as well as doctor systems and holders, doctor blades, cleaning showers and fabric-conditioning systems, forming systems and wear surfaces, and water-filtration systems. The Industrial Processing segment provides ring and rotary debarkers, stranders, chippers, engineered knife systems, and industrial automation and control products. This segment also offers recycling and approach flow systems, virgin pulping process equipment, boiler cleaning technologies, and single and double-screw presses. The Material Handling segment provides vibratory and conveying equipment; individual components and equipment for baling recyclable and waste materials; and fiber-based products. It sells its products and services through direct sales, independent sales agents, and distributors. The company was formerly known as Thermo Fibertek, Inc. and changed its name to Kadant Inc. in July 2001. Kadant Inc. was incorporated in 1991 and is headquartered in Westford, Massachusetts.

Proto Labs, Inc., together with its subsidiaries, operates as a digital manufacturer of custom parts in the United States and Europe. It offers manufacturing services, such as molding, computer numerical control machining, 3D printing, and sheet metal to developers, engineers, and supply chain teams. The company was incorporated in 1999 and is headquartered in Maple Plain, Minnesota.

Latest Machinery and Kadant Inc., Proto Labs, Inc. Stock News

As of August 20, 2026, Kadant Inc. had a $3.7 billion market capitalization, compared to the Machinery median of $3.7 million. Kadant Inc.’s stock is NA in 2026, NA in the previous five trading days and down 7.74% in the past year.

Currently, Kadant Inc.’s price-earnings ratio is 33.8. Kadant Inc.’s trailing 12-month revenue is $1.2 billion with a 9.5% net profit margin. Year-over-year quarterly sales growth most recently was 22.6%. Analysts expect adjusted earnings to reach $12.038 per share for the current fiscal year. Kadant Inc. currently has a 0.5% dividend yield.

Currently, Proto Labs, Inc.’s price-earnings ratio is 62.5. Proto Labs, Inc.’s trailing 12-month revenue is $560.5 million with a 5.4% net profit margin. Year-over-year quarterly sales growth most recently was 10.5%. Analysts expect adjusted earnings to reach $2.214 per share for the current fiscal year. Proto Labs, Inc. does not currently pay a dividend.

How We Compare Kadant Inc., Proto Labs and Inc. Stock Grades

Stock evaluation requires access to huge amounts of data and the knowledge and time to sift through it all, make sense of financial ratios, read income statements and analyze recent stock movements. AAII created A+ Investor, a robust data suite that condenses data research in an actionable and customizable way suitable for investors of all knowledge levels, to help investors streamline and work through such data.

AAII’s proprietary stock grades come with A+ Investor. These offer intuitive A‐F grades for each of five key investing factors: value, growth, momentum, earnings estimate revisions and quality. Here, we’ll take a closer look at Kadant Inc., Proto Labs and Inc.’s stock grades to see how they measure up against one another.

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Kadant Inc., Proto Labs and Inc.’s Quality Grades

Company	Ticker	Quality
Kadant Inc.	KAI	B
Proto Labs, Inc.	PRLB	A

Like the Value Grade, AAII’s A+ Investor Quality Grade comes from the percentile rank of key metrics. Specifically, the Quality Score is the percentile rank of the average of the percentile ranks of return on assets (ROA), return on invested capital (ROIC), gross profit relative to assets, buyback yield, change in total liabilities to assets, accruals, Z double prime bankruptcy risk (Z) score and the F-Score.

The score is variable, meaning it can consider all eight measures or, should any of the eight measures not be valid, the remaining measures that are valid. To be assigned a Quality Score, stocks must have a valid (non-null) measure and corresponding ranking for at least four of the eight quality measures.

The Quality Score is used to assess the underlying “quality” of a particular stock. A higher-quality stock possesses traits associated with upside potential and reduced downside risk. Backtesting of the Quality Grade shows that stocks with higher grades, on average, outperformed stocks with lower grades over the period of 1998 through 2019.

Stocks receive better grades (higher scores) for having higher scores for the quality subcomponents and worse grades (lower scores) for lower scores for the subcomponents.

Kadant Inc. has a Quality Score of 65, which is Strong. Proto Labs, Inc. has a Quality Score of 85, which is Very Strong.

The Quality Grade Winner: Proto Labs, Inc.

As you can clearly see from the Quality Grade breakdown above, Proto Labs, Inc. has a better overall quality grade than Kadant Inc.. For investors who are looking for companies with higher quality than others in the same industry, Proto Labs, Inc. could be a good stock to add to their portfolios. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Kadant Inc., Proto Labs and Inc.’s Momentum Grades

Company	Ticker	Momentum
Kadant Inc.	KAI	C
Proto Labs, Inc.	PRLB	B

Momentum grades help to uncover stocks experiencing anomalously high rates of return; research finds that stocks with high relative levels of momentum tend to outperform, whereas those with low levels of momentum tend to continue underperforming. Momentum is based on the price change of a stock over a specified period relative to all other stocks.

Typically, AAII looks at the weighted relative strength over the trailing four quarters. The weighted four-quarter relative strength rank is the relative price change for each of the past four quarters. The most recent quarterly price change is given a weight of 40% and each of the three previous quarters are given a weighting of 20%.

Kadant Inc. has a Momentum Score of 42, which is Average. Proto Labs, Inc. has a Momentum Score of 80, which is Strong.

The Momentum Grade Winner: Proto Labs, Inc.

As you can clearly see from the Momentum Grade breakdown above, Proto Labs, Inc. is considered to have stronger momentum compared to Kadant Inc.. For those specifically looking for companies that have stronger momentum compared to other companies in the same industry, Proto Labs, Inc. could be a good stock to invest in. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Kadant Inc., Proto Labs and Inc.’s Estimate Revisions Grades

Company	Ticker	Earnings Estimate
Kadant Inc.	KAI	B
Proto Labs, Inc.	PRLB	A

Earnings estimate revisions scores consider the magnitude of a company’s earnings surprise in its last two reported fiscal quarters. Often, positive surprises beget further positive surprises‐or at least continued sales growth (the exact opposite is generally true, too).

Estimate revisions offer an indication of what analysts are thinking about the short-term prospects of a firm. Estimate revisions are based on the statistical significance of a firm’s last two quarterly earnings surprises and the percentage change in its consensus estimate for the current fiscal year over the past month and past three months.

Kadant Inc. has a Earnings Estimate Score of 66, which is Positive. Proto Labs, Inc. has a Earnings Estimate Score of 86, which is Very Positive.

The Earnings Estimate Revisions Grade Winner: Proto Labs, Inc.

As you can clearly see from the Earnings Estimate Revisions Grade breakdown above, Proto Labs, Inc. has a better Earnings Estimate Revisions Grade than Kadant Inc.. For those who are specifically looking for companies with better short-term prospects when compared to other companies in the same industry, Proto Labs, Inc. could be a good stock to invest in. However, it’s important to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Other Kadant Inc., Proto Labs and Inc. Grades

In addition to Momentum, Estimate Revisions and Quality, A+ Investor also provides grades for Value and Growth.

Growth investing builds on the idea that stocks of companies exhibiting strong, consistent and prolonged growth outperform those of slower-growth companies. AAII measures growth through consistency of annual sales growth, five-year sales growth rankings adjusted for extreme levels, and consistency of positive annual cash from operations.

Successful stock investing involves buying low and selling high, so stock valuation is an important consideration for stock selection. Buying stocks that are going to go up typically means buying stocks that are undervalued in the first place, although momentum investors may argue that point.

These 2 key factors, when combined with the above, provide a holistic view into a particular stock. Further, by joining A+ Investor you can see whether Kadant Inc., Proto Labs and Inc. pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Kadant Inc., Proto Labs or Inc. Stock?

Overall, Kadant Inc. stock has a Momentum Score of 42, Estimate Revisions Score of 66 and Quality Score of 65.

Proto Labs, Inc. stock has a Momentum Score of 80, Estimate Revisions Score of 86 and Quality Score of 85.

Comparing Kadant Inc., Proto Labs and Inc.’s grades, scores and metrics can act as a solid basis to determine whether they may be a good investment or not. You’ll also want to look at your portfolio’s asset allocation as well as your risk tolerance and financial goals to see if either of these stocks would make a good fit for you. AAII can help you figure out which investments align with your individual needs and preferences.

Investors are encouraged to do their own due diligence and research. In this way, individuals can effectively become managers of their own assets‐without having to rely on others for financial independence. You can count on AAII for timeless articles on financial planning and stock-picking, unbiased research and actionable analysis.

A+ Investor adds to our qualitative teaching with a powerful data suite to help you whittle down investment choices to find stocks, exchange-traded funds (ETFs) or mutual funds that meet your needs.

AAII Disclaimer

We make no representations or warranties that any investor will, or is likely to, achieve profits similar to those shown, because past, hypothetical or simulated performance is not necessarily indicative of future results. Before making an investment decision, you should consider your circumstances and whether the information on our content is applicable to your situation. This information was prepared in good faith, and we accept no liability for any errors or omissions. The full disclaimer can be read here.