Sifting through countless of stocks in the Wireless Telecommunication Services 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 Gogo Inc. or Millicom International Cellular S.A. 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 Gogo Inc. and Millicom International Cellular S.A. compare based on key financial metrics to determine which better meets your investment needs.

About Gogo Inc. and Millicom International Cellular S.A.

Gogo Inc., together with its subsidiaries, provides broadband connectivity services to the aviation industry in the United States and internationally. The company’s product platform includes networks, antennas, and airborne equipment and software. The company offers in-flight systems; in-flight services; aviation partner support; and engineering, design, and development services, as well as production operations functions. It offers voice and data, in-flight entertainment, and other services. In addition, the company’s infrastructure includes networks, towers, cyber security software and data centers to support in-flight connectivity services, as well as in the provision of telecommunications services. The company sells its products primarily to aircraft operators and original equipment manufacturers of business aviation aircraft through a distribution network of independent dealers. Gogo Inc. was founded in 1991 and is headquartered in Broomfield, Colorado.

Millicom International Cellular S.A. engages in the provision cable and mobile services in Latin America. The company offers mobile services, including mobile data and voice, and short message services; and mobile financial services, such as payments, money transfers, international remittances, savings, real-time loans, and micro-insurance. In addition, the company provides fixed services, including broadband, fixed voice, and pay-TV; and fixed-voice and data telecommunications services, managed services, cloud and security solutions, and value-added services; and tower infrastructure and services. The company serves small, medium, and large businesses, as well as residential consumers and governmental entities. It markets its products and services under the Tigo and Tigo Business brands. The company was founded in 1990 and is headquartered in Luxembourg, Luxembourg.

Latest Wireless Telecommunication Services and Gogo Inc., Millicom International Cellular S.A. Stock News

As of September 1, 2026, Gogo Inc. had a $345.5 million market capitalization, compared to the Wireless Telecommunication Services median of $6.5 million. Gogo Inc.’s stock is down 44.8% in 2026, down 9.8% in the previous five trading days and down 76.78% in the past year.

Currently, Gogo Inc. does not have a price-earnings ratio. Gogo Inc.’s trailing 12-month revenue is $903.3 million with a -0.1% net profit margin. Year-over-year quarterly sales growth most recently was -1.4%. Analysts expect adjusted earnings to reach $0.320 per share for the current fiscal year. Gogo Inc. does not currently pay a dividend.

As of September 1, 2026, Millicom International Cellular S.A. had a $15.5 billion market cap, putting it in the 83rd percentile of all stocks. Millicom International Cellular S.A.’s stock is up 70.7% in 2026, down 1.6% in the previous five trading days and up 91.68% in the past year.

Currently, Millicom International Cellular S.A.’s price-earnings ratio is 23.2. Millicom International Cellular S.A.’s trailing 12-month revenue is $7.2 billion with a 9.2% net profit margin. Year-over-year quarterly sales growth most recently was 59.4%. Analysts expect adjusted earnings to reach $4.544 per share for the current fiscal year. Millicom International Cellular S.A. currently has a 4.9% dividend yield.

How We Compare Gogo Inc. and Millicom International Cellular S.A. 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 Gogo Inc. and Millicom International Cellular S.A.’s stock grades to see how they measure up against one another.

Learn more about A+ Investor here!

Sign Up to Receive a Free Special Report Showing How A+ Grades Can Help You Make Smarter Investment Decisions

Gogo Inc. and Millicom International Cellular S.A. Stock Value Grades

Company	Ticker	Value
Gogo Inc.	GOGO	C
Millicom International Cellular S.A.	TIGO	C

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.

Gogo Inc. has a Value Score of 54, which is Average. Millicom International Cellular S.A. has a Value Score of 47, which is Average.

The Value Stock Winner: No Clear Winner

Neither Gogo Inc. or Millicom International Cellular S.A. 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 Gogo Inc. or Millicom International Cellular S.A. is the better investment when it comes to value.

Gogo Inc. and Millicom International Cellular S.A. Growth Grades

Company	Ticker	Growth
Gogo Inc.	GOGO	C
Millicom International Cellular S.A.	TIGO	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.

Gogo Inc. has a Growth Score of 59, which is Average. Millicom International Cellular S.A. has a Growth Score of 100, which is Very Strong.

The Growth Grade Winner: Millicom International Cellular S.A.

As you can clearly see from the Growth Grade breakdown above, Millicom International Cellular S.A. has a more attractive growth grade than Gogo Inc.. For investors who focus solely on how a company is growing relative to other companies in the same industry, Millicom International Cellular S.A. could be a good stock to add to their portfolio. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Gogo Inc. and Millicom International Cellular S.A.’s Momentum Grades

Company	Ticker	Momentum
Gogo Inc.	GOGO	F
Millicom International Cellular S.A.	TIGO	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%.

Gogo Inc. has a Momentum Score of 5, which is Very Weak. Millicom International Cellular S.A. has a Momentum Score of 84, which is Very Strong.

The Momentum Grade Winner: Millicom International Cellular S.A.

As you can clearly see from the Momentum Grade breakdown above, Millicom International Cellular S.A. is considered to have stronger momentum compared to Gogo Inc.. For those specifically looking for companies that have stronger momentum compared to other companies in the same industry, Millicom International Cellular S.A. 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 Gogo Inc. and Millicom International Cellular S.A. Grades

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

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).

AAII’s A+ Investor Quality Grade comes from the ranking of key metrics. Specifically, the quality grade is the percentile rank of the composite 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 F-Score.

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 Gogo Inc. and Millicom International Cellular S.A. pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Gogo Inc. or Millicom International Cellular S.A. Stock?

Overall, Gogo Inc. stock has a Value Score of 54, Growth Score of 59 and Momentum Score of 5.

Millicom International Cellular S.A. stock has a Value Score of 47, Growth Score of 100 and Momentum Score of 84.

Comparing Gogo Inc. and Millicom International Cellular S.A.’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.