017670.KS vs. T

Last updated Jun 5, 2026

017670.KS (SK Telecom Co Ltd) and T (AT&T Inc.) are both stocks. Both operate in the Telecom Services industry within the Communication Services sector. Over the past 10 years, 017670.KS returned 19.04%/yr vs 6.24%/yr for T. At a 0.00 correlation, their price movements are largely independent.

Performance

017670.KS vs. T - Performance Comparison

The chart below illustrates the hypothetical performance of a ₩10,000 investment in SK Telecom Co Ltd (017670.KS) and AT&T Inc. (T). The values are adjusted to include any dividend payments, if applicable.

Different Trading Currencies

017670.KS is traded in KRW, while T is traded in USD. To make them comparable, the T values have been converted to KRW using the latest available exchange rates.

Returns By Period

In the year-to-date period, 017670.KS achieves a 105.25% return, which is significantly higher than T's 1.32% return. Over the past 10 years, 017670.KS has outperformed T with an annualized return of 19.04%, while T has yielded a comparatively lower 6.24% annualized return.

017670.KS

• 1D: -13.02%
• 1M: 14.98%
• YTD: 105.25%
• 6M: 101.85%
• 1Y: 111.94%
• 3Y*: 37.19%
• 5Y*: 21.51%
• 10Y*: 19.04%

T

• 1D: 1.61%
• 1M: -4.06%
• YTD: 1.32%
• 6M: -2.67%
• 1Y: -1.58%
• 3Y*: 27.07%
• 5Y*: 14.13%
• 10Y*: 6.24%

*Multi-year figures are annualized to reflect compound growth (CAGR)

017670.KS vs. T - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
017670.KS SK Telecom Co Ltd	105.25%	1.84%	15.36%	13.63%	-12.81%	49.31%	8.47%	-4.31%	8.70%	27.96%
T AT&T Inc.	1.32%	11.35%	64.27%	0.03%	11.74%	0.69%	-25.99%	51.07%	-18.90%	-15.19%

Correlation

The correlation between 017670.KS and T is -0.02, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.02
Correlation (3Y) Calculated over the trailing 3-year period	-0.04
Correlation (5Y) Calculated over the trailing 5-year period	-0.01
Correlation (10Y) Calculated over the trailing 10-year period	0.01
Correlation (All Time) Calculated using the full available price history since Jul 6, 2007	0.00

Return for Risk

017670.KS vs. T — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

017670.KS

017670.KS Risk / Return Rank: 94
017670.KS Sharpe Ratio Rank: 93
017670.KS Sortino Ratio Rank: 91
017670.KS Omega Ratio Rank: 94
017670.KS Calmar Ratio Rank: 94
017670.KS Martin Ratio Rank: 96

T

T Risk / Return Rank: 13
T Sharpe Ratio Rank: 13
T Sortino Ratio Rank: 14
T Omega Ratio Rank: 15
T Calmar Ratio Rank: 16
T Martin Ratio Rank: 8

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

017670.KS vs. T - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for SK Telecom Co Ltd (017670.KS) and AT&T Inc. (T). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

	017670.KS	T	Difference
Sharpe ratio: Return per unit of total volatility	2.65	-0.07	+2.72
Sortino ratio: Return per unit of downside risk	3.36	0.08	+3.29
Omega ratio: Gain probability vs. loss probability	1.55	1.01	+0.54
Calmar ratio: Return relative to maximum drawdown	6.32	-0.08	+6.40
Martin ratio: Return relative to average drawdown	21.26	-0.18	+21.44
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

017670.KS vs. T - Sharpe Ratio Comparison

The current 017670.KS Sharpe Ratio is 2.65, which is higher than the T Sharpe Ratio of -0.07. The chart below compares the historical Sharpe Ratios of 017670.KS and T, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	017670.KS	T	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.65	-0.07	+2.72
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.83	0.57	+0.26
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.77	0.26	+0.51
Sharpe Ratio (All Time) Calculated using the full available price history	0.13	0.29	-0.16

Drawdowns

017670.KS vs. T - Drawdown Comparison

The maximum 017670.KS drawdown since its inception was -62.33%, which is greater than T's maximum drawdown of -38.87%. Use the drawdown chart below to compare losses from any high point for 017670.KS and T.

Drawdown Indicators

	017670.KS	T	Difference
Max Drawdown Largest peak-to-trough decline	-62.33%	-38.87%	-23.46%
Max Drawdown (1Y) Largest decline over 1 year	-18.73%	-19.64%	+0.91%
Max Drawdown (3Y) Largest decline over 3 years	-18.73%	-19.64%	+0.91%
Max Drawdown (5Y) Largest decline over 5 years	-25.42%	-33.95%	+8.53%
Max Drawdown (10Y) Largest decline over 10 years	-35.84%	-38.87%	+3.03%
Current Drawdown Current decline from peak	-13.02%	-18.34%	+5.32%
Average Drawdown Average peak-to-trough decline	-19.36%	-13.52%	-5.84%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.47%	8.69%	-3.22%

Volatility

017670.KS vs. T - Volatility Comparison

SK Telecom Co Ltd (017670.KS) has a higher volatility of 24.29% compared to AT&T Inc. (T) at 8.39%. This indicates that 017670.KS's price experiences larger fluctuations and is considered to be riskier than T based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	017670.KS	T	Difference
Volatility (1M) Calculated over the trailing 1-month period	24.29%	8.39%	+15.90%
Volatility (6M) Calculated over the trailing 6-month period	42.10%	19.68%	+22.42%
Volatility (1Y) Calculated over the trailing 1-year period	44.62%	24.13%	+20.49%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	27.34%	24.98%	+2.36%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	25.61%	23.94%	+1.67%

Dividends

017670.KS vs. T - Dividend Comparison

017670.KS's dividend yield for the trailing twelve months is around 1.52%, less than T's 4.88% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
017670.KS SK Telecom Co Ltd	1.52%	5.07%	4.51%	7.07%	7.00%	5.71%	8.02%	8.02%	7.08%	7.15%	8.52%	8.86%
T AT&T Inc.	4.88%	4.47%	4.87%	6.62%	6.66%	8.46%	7.23%	5.22%	7.01%	5.04%	4.51%	5.46%

Financials

Frequently Asked Questions

Can I hold both 017670.KS and T in my portfolio?

017670.KS and T have a correlation of -0.02, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.