GLW vs. T

Last updated Jun 13, 2026

GLW (Corning Incorporated) and T (AT&T Inc.) are both stocks. GLW operates in Electronic Components (Technology), while T operates in Telecom Services (Communication Services). Over the past 10 years, GLW returned 27.57%/yr vs 3.33%/yr for T. At a 0.26 correlation, their price movements are largely independent.

Performance

GLW vs. T - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Corning Incorporated (GLW) and AT&T Inc. (T). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, GLW achieves a 105.36% return, which is significantly higher than T's -2.96% return. Over the past 10 years, GLW has outperformed T with an annualized return of 27.57%, while T has yielded a comparatively lower 3.33% annualized return.

GLW

• 1D: 1.50%
• 1M: -6.43%
• YTD: 105.36%
• 6M: 103.59%
• 1Y: 265.24%
• 3Y*: 79.90%
• 5Y*: 36.42%
• 10Y*: 27.57%

T

• 1D: 2.52%
• 1M: -1.87%
• YTD: -2.96%
• 6M: -1.93%
• 1Y: -12.71%
• 3Y*: 20.58%
• 5Y*: 7.38%
• 10Y*: 3.33%

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

GLW vs. T - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
GLW Corning Incorporated	105.36%	87.76%	60.64%	-1.23%	-11.56%	5.92%	27.57%	-1.02%	-3.28%	34.63%
T AT&T Inc.	-2.96%	13.97%	44.08%	-2.74%	5.76%	-8.09%	-21.37%	45.55%	-22.25%	-4.01%

Correlation

The correlation between GLW and T is -0.17, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.17
Correlation (3Y) Calculated over the trailing 3-year period	-0.01
Correlation (5Y) Calculated over the trailing 5-year period	0.16
Correlation (10Y) Calculated over the trailing 10-year period	0.25
Correlation (All Time) Calculated using the full available price history since Jul 19, 1984	0.26

The correlation between GLW and T shifts across timeframes, from -0.17 (1 year) to 0.26 (all time), reflecting how their relationship changes across market environments.

Fundamentals

EPS GLW : $2.10 T : $3.04
PE Ratio GLW : 85.36 T : 7.74
PEG Ratio GLW : 2.07 T : 0.32
PS Ratio GLW : 9.47 T : 1.35
Total Revenue (TTM) GLW : $16.32B T : $125.65B
Gross Profit (TTM) GLW : $5.93B T : $105.41B
EBITDA (TTM) GLW : $3.77B T : $54.70B

Return for Risk

GLW vs. T — Risk / Return Rank

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

GLW

GLW Risk / Return Rank: 98
GLW Sharpe Ratio Rank: 99
GLW Sortino Ratio Rank: 96
GLW Omega Ratio Rank: 96
GLW Calmar Ratio Rank: 98
GLW Martin Ratio Rank: 99

T

T Risk / Return Rank: 18
T Sharpe Ratio Rank: 17
T Sortino Ratio Rank: 17
T Omega Ratio Rank: 18
T Calmar Ratio Rank: 21
T Martin Ratio Rank: 15

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.

GLW vs. T - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Corning Incorporated (GLW) 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	GLW	T	Difference
Sharpe ratio: Return per unit of total volatility	4.59	-0.59	+5.17
Sortino ratio: Return per unit of downside risk	4.25	-0.72	+4.97
Omega ratio: Gain probability vs. loss probability	1.60	0.92	+0.69
Calmar ratio: Return relative to maximum drawdown	11.23	-0.59	+11.82
Martin ratio: Return relative to average drawdown	35.65	-1.22	+36.87

GLW vs. T - Sharpe Ratio Comparison

The current GLW Sharpe Ratio is 4.59, which is higher than the T Sharpe Ratio of -0.59. The chart below compares the historical Sharpe Ratios of GLW 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.

Drawdowns

GLW vs. T - Drawdown Comparison

The maximum GLW drawdown since its inception was -99.02%, which is greater than T's maximum drawdown of -64.15%. Use the drawdown chart below to compare losses from any high point for GLW and T.

Drawdown Indicators

	GLW	T	Difference
Max Drawdown Largest peak-to-trough decline	-99.02%	-64.15%	-34.87%
Max Drawdown (1Y) Largest decline over 1 year	-23.01%	-21.87%	-1.14%
Max Drawdown (3Y) Largest decline over 3 years	-27.57%	-21.87%	-5.70%
Max Drawdown (5Y) Largest decline over 5 years	-34.52%	-32.01%	-2.51%
Max Drawdown (10Y) Largest decline over 10 years	-48.80%	-42.35%	-6.45%
Current Drawdown Current decline from peak	-13.83%	-18.12%	+4.29%
Average Drawdown Average peak-to-trough decline	-50.50%	-15.72%	-34.78%
Ulcer Index Depth and duration of drawdowns from previous peaks	7.23%	10.64%	-3.41%

Volatility

GLW vs. T - Volatility Comparison

Corning Incorporated (GLW) has a higher volatility of 24.91% compared to AT&T Inc. (T) at 8.21%. This indicates that GLW'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

	GLW	T	Difference
Volatility (1M) Calculated over the trailing 1-month period	24.91%	8.21%	+16.70%
Volatility (6M) Calculated over the trailing 6-month period	50.66%	17.80%	+32.86%
Volatility (1Y) Calculated over the trailing 1-year period	56.33%	22.13%	+34.20%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	35.81%	24.01%	+11.80%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	33.86%	23.73%	+10.13%

Dividends

GLW vs. T - Dividend Comparison

GLW's dividend yield for the trailing twelve months is around 0.63%, less than T's 4.71% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
GLW Corning Incorporated	0.63%	1.28%	2.36%	3.68%	3.38%	2.58%	2.44%	2.75%	2.38%	1.94%	2.22%	2.63%
T AT&T Inc.	4.71%	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 GLW and T in my portfolio?

GLW and T have a correlation of -0.17, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, GLW or T?

GLW has higher volatility (24.91%) compared to T (8.21%). In terms of maximum drawdown, GLW dropped -99.02% vs T's -64.15%.

Which has better risk-adjusted returns?

GLW currently has the higher Sharpe Ratio (4.58 vs -0.59), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.