Sifting through countless of stocks in the Communications Equipment 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 Calix, Inc. or Digi International 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 Calix, Inc. and Digi International Inc. compare based on key financial metrics to determine which better meets your investment needs.

About Calix, Inc. and Digi International Inc.

Calix, Inc., together with its subsidiaries, engages in the provision of cloud and software platforms, and systems and services in the United States, rest of Americas, Europe, the Middle East, Africa, and the Asia Pacific. The company cloud and software platforms, and systems and services enable broadband service providers (BSPs) to provide a range of services. It offers Calix Cloud platform comprising Calix Engagement Cloud, Calix Operations Cloud, and Calix Service Cloud, which are configurable to display role-based insights and enable BEPs to anticipate and target new revenue-generating services and applications through mobile application, such as CommandIQ for residents and CommandWorx for businesses; Calix Intelligent Access, an access network solution for automated and intelligent networks; and Calix Unlimited Subscriber, a solution for subscriber managed services. It also provides SmartLife managed services, including SmartHome managed services and applications to enhance, operate and secure the connected experience of subscribers in their home for Wi-Fi, advanced content control, network security, connected cameras, and social media monitoring; SmartTown managed services that reimagine community Wi-Fi as a ubiquitous, secure, and managed experience across a BEP’s footprint; SmartBiz managed services that address the business networking and productivity needs of business owners with an all-in-one managed service; SMARTMDU managed services provide purpose-built, flexible connectivity solutions for multi-family properties of any type. In addition, the company offers Wi-Fi systems under GigaSpire and GigaPro brands to be ready for deployment as a complete subscriber experience solution for BEP’s residential and business subscribers. It provides its products through its direct sales force and resellers. Calix, Inc. was incorporated in 1999 and is headquartered in San Jose, California.

Digi International Inc. provides business and mission-critical Internet of Things (IoT) connectivity products, services, and solutions in the United States, Europe, the Middle East, Africa, and internationally. It operates through IoT Products & Services, and IoT Solutions segments. The company offers cellular routers for mission-critical wireless connectivity; cellular modules to embed cellular communications abilities into the products to deploy and manage intelligent and secure cellular connected products; console servers to provide secure and remote access to network equipment in data centers and at edge locations; and radio frequency products, including embedded wireless modules, off-the-shelf gateways, modems, and adapters under the Digi XBee brand. It also provides embedded system products under the Digi Connect, and ConnectCore brands; and infrastructure management products comprising serial servers, which offers serial port-to-Ethernet integration of devices into wired Ethernet networks; and universal serial bus solutions. In addition, it provides Digi Remote Manager and Lighthouse, a recurring revenue cloud-based service that offers a secure environment for customers to manage connected device deployment and network devices; SmartSense by Digi for monitoring wirelessly the temperature of food and other perishable or sensitive goods, monitoring facilities or pharmacies by tracking the completion of operating tasks by employees, and quality control and incident management in food service, healthcare, and transportation/logistics industries; and Ventus for MNaaS solutions. Further, the company provides professional services, such as site planning, implementation management, application development, and customer training; data plan subscriptions; and enhanced technical support services, as well as Digi Wireless Design Services. Digi International Inc. was incorporated in 1985 and is headquartered in Hopkins, Minnesota.

Latest Communications Equipment and Calix, Inc., Digi International Inc. Stock News

As of May 1, 2026, Calix, Inc. had a $2.8 billion market capitalization, compared to the Communications Equipment median of $482.6 million. Calix, Inc.’s stock is down 17.7% in 2026, up 0.5% in the previous five trading days and up 6.4% in the past year.

Currently, Calix, Inc.’s price-earnings ratio is 90.5. Calix, Inc.’s trailing 12-month revenue is $1.1 billion with a 3.2% net profit margin. Year-over-year quarterly sales growth most recently was 27.2%. Analysts expect adjusted earnings to reach $1.777 per share for the current fiscal year. Calix, Inc. does not currently pay a dividend.

As of May 1, 2026, Digi International Inc. had a $2.2 billion market cap, putting it in the 56th percentile of all stocks. Digi International Inc.’s stock is up 32.7% in 2026, up 1.4% in the previous five trading days and up 111.43% in the past year.

Currently, Digi International Inc.’s price-earnings ratio is 51.3. Digi International Inc.’s trailing 12-month revenue is $448.8 million with a 9.5% net profit margin. Year-over-year quarterly sales growth most recently was 17.9%. Analysts expect adjusted earnings to reach $2.310 per share for the current fiscal year. Digi International Inc. does not currently pay a dividend.

How We Compare Calix, Inc. and Digi International 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 Calix, Inc. and Digi International Inc.’s stock grades to see how they measure up against one another.

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Calix, Inc. and Digi International Inc. Growth Grades

Company	Ticker	Growth
Calix, Inc.	CALX	A
Digi International Inc.	DGII	A

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.

Calix, Inc. has a Growth Score of 83, which is Very Strong. Digi International Inc. has a Growth Score of 95, which is Very Strong.

The Growth Grade Winner: It’s a Tie!

Looking at the Growth Grade breakdown above, both Calix, Inc. and Digi International Inc. have a grade of A. 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.

Calix, Inc. and Digi International Inc.’s Quality Grades

Company	Ticker	Quality
Calix, Inc.	CALX	A
Digi International Inc.	DGII	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.

Calix, Inc. has a Quality Score of 87, which is Very Strong. Digi International Inc. has a Quality Score of 84, which is Very Strong.

The Quality Grade Winner: It’s a Tie!

Looking at the Quality Grade breakdown above, both Calix, Inc. and Digi International 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.

Calix, Inc. and Digi International Inc.’s Momentum Grades

Company	Ticker	Momentum
Calix, Inc.	CALX	C
Digi International Inc.	DGII	A

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%.

Calix, Inc. has a Momentum Score of 41, which is Average. Digi International Inc. has a Momentum Score of 86, which is Very Strong.

The Momentum Grade Winner: Digi International Inc.

As you can clearly see from the Momentum Grade breakdown above, Digi International Inc. is considered to have stronger momentum compared to Calix, Inc.. For those specifically looking for companies that have stronger momentum compared to other companies in the same industry, Digi International 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.

Other Calix, Inc. and Digi International Inc. Grades

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

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

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 Calix, Inc. and Digi International Inc. pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Calix, Inc. or Digi International Inc. Stock?

Overall, Calix, Inc. stock has a Growth Score of 83, Momentum Score of 41 and Quality Score of 87.

Digi International Inc. stock has a Growth Score of 95, Momentum Score of 86 and Quality Score of 84.

Comparing Calix, Inc. and Digi International 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.