Sifting through countless of stocks in the Diversified 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 Lumen Technologies, Inc. or Turkcell Iletisim Hizmetleri A.S. 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 Lumen Technologies, Inc. and Turkcell Iletisim Hizmetleri A.S. compare based on key financial metrics to determine which better meets your investment needs.

About Lumen Technologies, Inc. and Turkcell Iletisim Hizmetleri A.S.

Lumen Technologies, Inc., a networking company, provides integrated products and services to business and mass customers in the United States and internationally. The company operates in two segments, Business and Mass Markets. It offers dark fiber and conduit, edge cloud, internet protocol (IP), voice over IP, managed security, software-defined wide area networks, unified communications and collaboration, and optical services; ethernet and VPN data networks services; and legacy services to manage cash flow, including time division multiplexing voice and private line; other legacy services, such as Synchronous Optical Network (SONET) based ethernet, legacy data hosting services, and conferencing services; and managed and professional service solutions, as well as sells communications equipment. The company also provides high speed and lower speed broadband service to residential and small business customers; local and long-distance voice services, professional services, and other ancillary services; and federal broadband and state support programs. It serves its products and services under the Lumen, CenturyLink, Black Lotus Labs, and Quantum Fiber brand name. The company was formerly known as CenturyLink, Inc. and changed its name to Lumen Technologies, Inc. in September 2020. Lumen Technologies, Inc. was incorporated in 1968 and is headquartered in Monroe, Louisiana.

Turkcell Iletisim Hizmetleri A.S., together with its subsidiaries, engages in establishing and operating a global system for mobile communications (GSM) network in Turkey, Belarus, Turkish Republic of Northern Cyprus, Germany, and the Netherlands. It operates through the Turkcell Turkiye, Turkcell International, and Techfin segments. The company is involved in information technology, value added GSM, and entertainment investment, as well as research and development, digital and insurance agency, property investments, electricity energy trade, and wholesale and retail electricity sales activities. It also provides telecommunications, television, and content; digitalization; sales, delivery, and digital sales; consumer financing; cloud solutions; online radio, television, and on-demand streaming; telecommunications infrastructure; electronic payment; and develop software products and services. In addition, the company offers customer relations and human resources management; directory assistance; payment services and e-money; internet search engine and browser; venture capital investment fund; meal coupons and cards; data processing; data center and cloud; programming and technical support; and digital education services. Further, it provides training software developers. Turkcell Iletisim Hizmetleri A.S. was incorporated in 1993 and is headquartered in Istanbul, Turkey.

Latest Diversified Telecommunication Services and Lumen Technologies, Inc., Turkcell Iletisim Hizmetleri A.S. Stock News

As of September 11, 2026, Lumen Technologies, Inc. had a $7.2 billion market capitalization, compared to the Diversified Telecommunication Services median of $6.4 million. Lumen Technologies, Inc.’s stock is down 10.7% in 2026, up 0.4% in the previous five trading days and up 13.03% in the past year.

Currently, Lumen Technologies, Inc. does not have a price-earnings ratio. Lumen Technologies, Inc.’s trailing 12-month revenue is $11.8 billion with a -8.7% net profit margin. Year-over-year quarterly sales growth most recently was -9.3%. Analysts expect adjusted earnings to reach $-0.812 per share for the current fiscal year. Lumen Technologies, Inc. does not currently pay a dividend.

As of September 11, 2026, Turkcell Iletisim Hizmetleri A.S. had a $4.6 billion market cap, putting it in the 66th percentile of all stocks. Turkcell Iletisim Hizmetleri A.S.’s stock is down 1.8% in 2026, up 6.1% in the previous five trading days and down 2.36% in the past year.

Currently, Turkcell Iletisim Hizmetleri A.S.’s price-earnings ratio is 30.5. Turkcell Iletisim Hizmetleri A.S.’s trailing 12-month revenue is $5.3 billion with a 7.2% net profit margin. Year-over-year quarterly sales growth most recently was -12.6%. There are no analysts providing consensus earnings estimates for the current fiscal year. Turkcell Iletisim Hizmetleri A.S. does not currently pay a dividend.

How We Compare Lumen Technologies, Inc. and Turkcell Iletisim Hizmetleri A.S. 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 Lumen Technologies, Inc. and Turkcell Iletisim Hizmetleri A.S.’s stock grades to see how they measure up against one another.

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Lumen Technologies, Inc. and Turkcell Iletisim Hizmetleri A.S. Growth Grades

Company	Ticker	Growth
Lumen Technologies, Inc.	LUMN	F
Turkcell Iletisim Hizmetleri A.S.	TKC	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.

Lumen Technologies, Inc. has a Growth Score of 13, which is Very Weak. Turkcell Iletisim Hizmetleri A.S. has a Growth Score of 61, which is Strong.

The Growth Grade Winner: Turkcell Iletisim Hizmetleri A.S.

As you can clearly see from the Growth Grade breakdown above, Turkcell Iletisim Hizmetleri A.S. has a more attractive growth grade than Lumen Technologies, Inc.. For investors who focus solely on how a company is growing relative to other companies in the same industry, Turkcell Iletisim Hizmetleri A.S. 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.

Lumen Technologies, Inc. and Turkcell Iletisim Hizmetleri A.S.’s Quality Grades

Company	Ticker	Quality
Lumen Technologies, Inc.	LUMN	B
Turkcell Iletisim Hizmetleri A.S.	TKC	B

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.

Lumen Technologies, Inc. has a Quality Score of 61, which is Strong. Turkcell Iletisim Hizmetleri A.S. has a Quality Score of 64, which is Strong.

The Quality Grade Winner: It’s a Tie!

Looking at the Quality Grade breakdown above, both Lumen Technologies, Inc. and Turkcell Iletisim Hizmetleri A.S. have a grade of B. 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.

Lumen Technologies, Inc. and Turkcell Iletisim Hizmetleri A.S.’s Momentum Grades

Company	Ticker	Momentum
Lumen Technologies, Inc.	LUMN	C
Turkcell Iletisim Hizmetleri A.S.	TKC	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%.

Lumen Technologies, Inc. has a Momentum Score of 47, which is Average. Turkcell Iletisim Hizmetleri A.S. has a Momentum Score of 35, which is Weak.

The Momentum Stock Winner: No Clear Winner

Neither Lumen Technologies, Inc. or Turkcell Iletisim Hizmetleri A.S. has a strong enough Momentum Grade to be considered a “winner.” Investors considering these companies should do additional due diligence and research to see if either could be a good addition to their portfolios. It’s important to look at a wide range of financial metrics in order to determine if Lumen Technologies, Inc. or Turkcell Iletisim Hizmetleri A.S. is the better investment when it comes to momentum.

Other Lumen Technologies, Inc. and Turkcell Iletisim Hizmetleri A.S. 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 Lumen Technologies, Inc. and Turkcell Iletisim Hizmetleri A.S. pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Lumen Technologies, Inc. or Turkcell Iletisim Hizmetleri A.S. Stock?

Overall, Lumen Technologies, Inc. stock has a Growth Score of 13, Momentum Score of 47 and Quality Score of 61.

Turkcell Iletisim Hizmetleri A.S. stock has a Growth Score of 61, Momentum Score of 35 and Quality Score of 64.

Comparing Lumen Technologies, Inc. and Turkcell Iletisim Hizmetleri A.S.’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.