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 Millicom International Cellular S.A. or TIM 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 Millicom International Cellular S.A. and TIM S.A. compare based on key financial metrics to determine which better meets your investment needs.

About Millicom International Cellular S.A. and TIM S.A.

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.

TIM S.A. engages in the telecommunications sector in Brazil. It offers landline switched telephone services in local, national, and international long-distance modes, as well as personal mobile and multimedia communication services. The company is based in Rio de Janeiro, Brazil. TIM S.A. is a subsidiary of TIM Brasil Serviços e Participações S.A.

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

As of July 31, 2026, Millicom International Cellular S.A. had a $16.0 billion market capitalization, compared to the Wireless Telecommunication Services median of $9.1 million. Millicom International Cellular S.A.’s stock is up 72.2% in 2026, up 1% in the previous five trading days and up 142.02% in the past year.

Currently, Millicom International Cellular S.A.’s price-earnings ratio is 13.0. Millicom International Cellular S.A.’s trailing 12-month revenue is $6.4 billion with a 19.1% net profit margin. Year-over-year quarterly sales growth most recently was 45.1%. Analysts expect adjusted earnings to reach $4.720 per share for the current fiscal year. Millicom International Cellular S.A. currently has a 3.1% dividend yield.

As of July 31, 2026, TIM S.A. had a $9.1 billion market cap, putting it in the 76th percentile of all stocks. TIM S.A.’s stock is down 1.4% in 2026, down 10% in the previous five trading days and up 6.44% in the past year.

Currently, TIM S.A.’s price-earnings ratio is 55.1. TIM S.A.’s trailing 12-month revenue is $5.3 billion with a 15.8% net profit margin. Year-over-year quarterly sales growth most recently was 11.0%. Analysts expect adjusted earnings to reach $1.857 per share for the current fiscal year. TIM S.A. currently has a 0.9% dividend yield.

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

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Millicom International Cellular S.A. and TIM S.A. Growth Grades

Company	Ticker	Growth
Millicom International Cellular S.A.	TIGO	A
TIM S.A.	TIMB	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.

Millicom International Cellular S.A. has a Growth Score of 100, which is Very Strong. TIM S.A. has a Growth Score of 77, which is 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 TIM S.A.. 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.

Millicom International Cellular S.A. and TIM S.A.’s Quality Grades

Company	Ticker	Quality
Millicom International Cellular S.A.	TIGO	C
TIM S.A.	TIMB	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.

Millicom International Cellular S.A. has a Quality Score of 54, which is Average. TIM S.A. has a Quality Score of 86, which is Very Strong.

The Quality Grade Winner: TIM S.A.

As you can clearly see from the Quality Grade breakdown above, TIM S.A. has a better overall quality grade than Millicom International Cellular S.A.. For investors who are looking for companies with higher quality than others in the same industry, TIM S.A. 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.

Millicom International Cellular S.A. and TIM S.A.’s Momentum Grades

Company	Ticker	Momentum
Millicom International Cellular S.A.	TIGO	A
TIM S.A.	TIMB	D

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%.

Millicom International Cellular S.A. has a Momentum Score of 91, which is Very Strong. TIM S.A. has a Momentum Score of 31, which is Weak.

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 TIM S.A.. 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 Millicom International Cellular S.A. and TIM S.A. Grades

In addition to Growth, Momentum 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 Millicom International Cellular S.A. and TIM S.A. pass any of our 60+ stock screens that have outperformed the market since their creation.

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

Overall, Millicom International Cellular S.A. stock has a Growth Score of 100, Momentum Score of 91 and Quality Score of 54.

TIM S.A. stock has a Growth Score of 77, Momentum Score of 31 and Quality Score of 86.

Comparing Millicom International Cellular S.A. and TIM 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.