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 CECO Environmental Corp., 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 CECO Environmental Corp., Proto Labs and Inc. compare based on key financial metrics to determine which better meets your investment needs.

About CECO Environmental Corp., Proto Labs and Inc.

CECO Environmental Corp. provides critical solutions in industrial air quality, industrial water treatment, and energy transition solutions in the United States, the United Kingdom, the Netherlands, China, and internationally. It operates through Engineered Systems and Industrial Process Solutions segments. The company offers emissions management, fluid bed cyclones, thermal acoustics, and separation and filtration solutions; engineering services and environmental systems; and industrial exhaust air contamination treatment and control systems, solutions, and services, as well as intelligent control solutions. It also provides engineered and configured products and solutions, including dampers and diverters, expansion joints, selective catalytic reduction systems, severe-service and industrial cyclones, dust collectors, thermal oxidizers, filtration systems, wet and dry scrubbers, separators and coalescers, water treatment packages, metallic and non-metallic pumps, industrial silencers, and fluid handling equipment, as well as plant engineering services and engineered design build fabrication services. In addition, the company offers solutions for air pollution and contamination control, fluid handling, and process filtration in various applications, such as aluminum beverage can production, automobile production, food and beverage processing, semiconductor fabrication, electronics production, steel and aluminum mill processing, wood manufacturing, desalination, and aquaculture markets, as well as it provides engineered industrial process heating solutions for process industries. It markets its power generation, hydrocarbon processing, water/wastewater treatment, oily water separation and treatment, marine and naval vessels, and midstream oil and gas sectors. CECO Environmental Corp. was founded in 1869 and is headquartered in Addison, Texas.

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 CECO Environmental Corp., Proto Labs, Inc. Stock News

As of August 21, 2026, CECO Environmental Corp. had a $4.2 billion market capitalization, compared to the Machinery median of $3.7 million. CECO Environmental Corp.’s stock is up 19.5% in 2026, down 10.1% in the previous five trading days and up 58.2% in the past year.

Currently, CECO Environmental Corp. does not have a price-earnings ratio. CECO Environmental Corp.’s trailing 12-month revenue is $903.2 million with a -3.4% net profit margin. Year-over-year quarterly sales growth most recently was 53.7%. Analysts expect adjusted earnings to reach $2.288 per share for the current fiscal year. CECO Environmental Corp. does not currently pay a dividend.

As of August 21, 2026, Proto Labs, Inc. had a $1.9 billion market cap, putting it in the 53rd percentile of all stocks. Proto Labs, Inc.’s stock is up 57.4% in 2026, down 13.3% in the previous five trading days and up 66.9% in the past year.

Currently, Proto Labs, Inc.’s price-earnings ratio is 63.1. 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 CECO Environmental Corp., 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 CECO Environmental Corp., Proto Labs and Inc.’s stock grades to see how they measure up against one another.

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CECO Environmental Corp., Proto Labs and Inc. Stock Value Grades

Company	Ticker	Value
CECO Environmental Corp.	CECO	F
Proto Labs, Inc.	PRLB	F

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.

AAII’s A+ Investor Value Grade derives from a stock’s value score. The Value Score is the percentile rank of the average of the percentile ranks of the price-to-sales ratio, price-earnings ratio, enterprise-value-to-EBITDA (EV/EBITDA) ratio, shareholder yield, price-to-book-value ratio and price-to-free-cash-flow ratio. The score is variable, meaning it can consider all six ratios or, should any of the six ratios not be valid, the remaining ratios that are valid. To be assigned a Value Score, stocks must have a valid (non-null) ratio and corresponding ranking for at least two of the six valuation ratios.

Stocks with a Value Score from 81 to 100 are considered deep value, those with a score between 61 and 80 are a good value and so on.

CECO Environmental Corp. has a Value Score of 16, which is Ultra Expensive. Proto Labs, Inc. has a Value Score of 19, which is Ultra Expensive.

The Value Stock Winner: No Clear Winner

Neither CECO Environmental Corp., Proto Labs or Inc. has a high enough value grade to be considered a “winner.” Investors who are considering these companies should do additional due diligence and research to see if either could be a good addition to their portfolio. It’s important to look at a wide range of financial metrics in order to determine if CECO Environmental Corp., Proto Labs or Inc. is the better investment when it comes to value.

CECO Environmental Corp., Proto Labs and Inc.’s Quality Grades

Company	Ticker	Quality
CECO Environmental Corp.	CECO	F
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.

CECO Environmental Corp. has a Quality Score of 9, which is Very Weak. 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 CECO Environmental Corp.. 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.

CECO Environmental Corp., Proto Labs and Inc.’s Estimate Revisions Grades

Company	Ticker	Earnings Estimate
CECO Environmental Corp.	CECO	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.

CECO Environmental Corp. has a Earnings Estimate Score of 76, 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 CECO Environmental Corp.. 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 CECO Environmental Corp., Proto Labs and Inc. Grades

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

Momentum grades help 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.

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.

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 CECO Environmental Corp., 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, CECO Environmental Corp., Proto Labs or Inc. Stock?

Overall, CECO Environmental Corp. stock has a Value Score of 16, Estimate Revisions Score of 76 and Quality Score of 9.

Proto Labs, Inc. stock has a Value Score of 19, Estimate Revisions Score of 86 and Quality Score of 85.

Comparing CECO Environmental Corp., 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.