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 The Timken Company, 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 The Timken Company, Proto Labs and Inc. compare based on key financial metrics to determine which better meets your investment needs.

About The Timken Company, Proto Labs and Inc.

The Timken Company designs, manufactures, and sells engineered bearings and industrial motion products, and related services in the United States and internationally. The company operates in two segments, Engineered Bearings and Industrial Motion. The Engineered Bearings segment provides various bearing products, including tapered, spherical, and cylindrical roller bearings; plain bearings, metal-polymer bearings, and rod end bearings; radial, angular, and precision ball bearings; thrust and specialty ball bearings; journal bearings; and housed or mounted bearings. This segment serves wind energy, agriculture, construction, food and beverage, metals and mining, automotive and truck, aerospace, rail, and other industries under the Timken, GGB, and Fafnir brands. The Industrial Motion segment offers a portfolio of engineered products, such as industrial drives, automatic lubrication systems, linear motion products and systems, chains, belts, couplings, filtration systems, seals, and industrial clutches and brakes, as well as industrial drivetrain and bearing repairing services. This segment serves a range of industries comprising solar energy, automation, construction, agriculture and turf, passenger rail, marine, aerospace, packaging and logistics, medical, and others under the Philadelphia Gear, Cone Drive, Rollon, Nadella, Groeneveld, BEKA, Diamond, Drives, Timken Belts, Spinea, Des-Case, Lagersmit, Lovejoy, CGI, and PT Tech brands. The Timken Company was founded in 1899 and is headquartered in North Canton, Ohio.

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 The Timken Company, Proto Labs, Inc. Stock News

As of August 20, 2026, The Timken Company had a $8.6 billion market capitalization, compared to the Machinery median of $3.7 million. The Timken Company’s stock is up 49.4% in 2026, down 5.9% in the previous five trading days and up 61.97% in the past year.

Currently, The Timken Company’s price-earnings ratio is 33.7. The Timken Company’s trailing 12-month revenue is $4.8 billion with a 5.4% net profit margin. Year-over-year quarterly sales growth most recently was 7.5%. Analysts expect adjusted earnings to reach $6.270 per share for the current fiscal year. The Timken Company currently has a 1.2% dividend yield.

As of August 20, 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 56.8% in 2026, down 13.6% in the previous five trading days and up 62.29% in the past year.

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 The Timken Company, 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 The Timken Company, Proto Labs and Inc.’s stock grades to see how they measure up against one another.

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The Timken Company, Proto Labs and Inc. Growth Grades

Company	Ticker	Growth
The Timken Company	TKR	B
Proto Labs, Inc.	PRLB	B

The foundation of growth investing is seeking out stocks of companies exhibiting strong, consistent and prolonged growth that is expected to continue into the future.

In order to compute the growth score and assign it a letter grade, the percentile ranks for each of three components‐consistency of annual sales growth, five-year sales growth rankings adjusted for extreme levels, and consistency of positive annual cash from operations‐must be determined. These three rank figures are added together, and the sum is ranked against the entire stock universe to arrive at a company’s Growth Score to create an equal distribution of grades.

The companies in the bottom 20% of the stock universe receive Growth Grades of F, considered to be very weak, while those in the top 20% receive A grades, which are considered very strong.

The Timken Company has a Growth Score of 73, which is Strong. Proto Labs, Inc. has a Growth Score of 73, which is Strong.

The Growth Grade Winner: It’s a Tie!

Looking at the Growth Grade breakdown above, both The Timken Company, Proto Labs and Inc. have a grade of B. For investors who focus solely on a company’s upward growth, further research should be conducted into both companies’ other financial metrics before deciding whether to invest.

The Timken Company, Proto Labs and Inc.’s Quality Grades

Company	Ticker	Quality
The Timken Company	TKR	A
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.

The Timken Company has a Quality Score of 84, which is Very Strong. Proto Labs, Inc. has a Quality Score of 85, which is Very Strong.

The Quality Grade Winner: It’s a Tie!

Looking at the Quality Grade breakdown above, both The Timken Company, Proto Labs and Inc. have a grade of A. For investors who focus solely on a company’s overall quality, you will need to conduct further research into both companies to see if they are a good fit for your portfolio. As a good rule of thumb, you should always analyze multiple factors based on a wide range of metrics before choosing a company to invest in.

The Timken Company, Proto Labs and Inc.’s Estimate Revisions Grades

Company	Ticker	Earnings Estimate
The Timken Company	TKR	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.

The Timken Company has a Earnings Estimate Score of 79, 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 The Timken Company. 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 The Timken Company, Proto Labs and Inc. Grades

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

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 The Timken Company, 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, The Timken Company, Proto Labs or Inc. Stock?

Overall, The Timken Company stock has a Growth Score of 73, Estimate Revisions Score of 79 and Quality Score of 84.

Proto Labs, Inc. stock has a Growth Score of 73, Estimate Revisions Score of 86 and Quality Score of 85.

Comparing The Timken Company, 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.