TMO vs. T

Last updated Jun 13, 2026

TMO (Thermo Fisher Scientific Inc.) and T (AT&T Inc.) are both stocks. TMO operates in Diagnostics & Research (Healthcare), while T operates in Telecom Services (Communication Services). Over the past 10 years, TMO returned 12.54%/yr vs 3.33%/yr for T. At a 0.23 correlation, their price movements are largely independent.

Performance

TMO vs. T - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Thermo Fisher Scientific Inc. (TMO) 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, TMO achieves a -18.92% return, which is significantly lower than T's -2.96% return. Over the past 10 years, TMO has outperformed T with an annualized return of 12.54%, while T has yielded a comparatively lower 3.33% annualized return.

TMO

• 1D: -1.33%
• 1M: 5.23%
• YTD: -18.92%
• 6M: -17.84%
• 1Y: 13.42%
• 3Y*: -3.43%
• 5Y*: 0.45%
• 10Y*: 12.54%

T

• 1D: 2.52%
• 1M: -4.69%
• YTD: -2.96%
• 6M: -1.93%
• 1Y: -12.96%
• 3Y*: 20.58%
• 5Y*: 7.38%
• 10Y*: 3.33%

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

TMO vs. T - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TMO Thermo Fisher Scientific Inc.	-18.92%	11.78%	-1.72%	-3.36%	-17.29%	43.54%	43.72%	45.55%	18.21%	35.03%
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 TMO and T is -0.05, 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	-0.05
Correlation (3Y) Calculated over the trailing 3-year period	0.08
Correlation (5Y) Calculated over the trailing 5-year period	0.17
Correlation (10Y) Calculated over the trailing 10-year period	0.19
Correlation (All Time) Calculated using the full available price history since Sep 1, 1987	0.23

The correlation between TMO and T shifts across timeframes, from -0.05 (1 year) to 0.23 (all time), reflecting how their relationship changes across market environments.

Fundamentals

EPS TMO : $18.22 T : $3.04
PE Ratio TMO : 25.76 T : 7.74
PS Ratio TMO : 3.91 T : 1.35
Total Revenue (TTM) TMO : $45.20B T : $125.65B
Gross Profit (TTM) TMO : $17.81B T : $105.41B
EBITDA (TTM) TMO : $11.16B T : $54.70B

Return for Risk

TMO vs. T — Risk / Return Rank

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

TMO

TMO Risk / Return Rank: 54
TMO Sharpe Ratio Rank: 58
TMO Sortino Ratio Rank: 53
TMO Omega Ratio Rank: 51
TMO Calmar Ratio Rank: 53
TMO Martin Ratio Rank: 53

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.

TMO vs. T - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Thermo Fisher Scientific Inc. (TMO) 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.

	TMO	T	Difference
Sharpe ratio: Return per unit of total volatility	0.43	-0.59	+1.02
Sortino ratio: Return per unit of downside risk	0.87	-0.72	+1.59
Omega ratio: Gain probability vs. loss probability	1.10	0.92	+0.19
Calmar ratio: Return relative to maximum drawdown	0.43	-0.59	+1.02
Martin ratio: Return relative to average drawdown	0.93	-1.22	+2.15

TMO vs. T - Sharpe Ratio Comparison

The current TMO Sharpe Ratio is 0.43, which is higher than the T Sharpe Ratio of -0.59. The chart below compares the historical Sharpe Ratios of TMO 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

TMO vs. T - Drawdown Comparison

The maximum TMO drawdown since its inception was -71.16%, which is greater than T's maximum drawdown of -64.15%. Use the drawdown chart below to compare losses from any high point for TMO and T.

Drawdown Indicators

	TMO	T	Difference
Max Drawdown Largest peak-to-trough decline	-71.16%	-64.15%	-7.01%
Max Drawdown (1Y) Largest decline over 1 year	-31.38%	-21.87%	-9.51%
Max Drawdown (3Y) Largest decline over 3 years	-37.28%	-21.87%	-15.41%
Max Drawdown (5Y) Largest decline over 5 years	-40.95%	-32.01%	-8.94%
Max Drawdown (10Y) Largest decline over 10 years	-40.95%	-42.35%	+1.40%
Current Drawdown Current decline from peak	-28.80%	-18.12%	-10.68%
Average Drawdown Average peak-to-trough decline	-18.11%	-15.72%	-2.39%
Ulcer Index Depth and duration of drawdowns from previous peaks	14.43%	10.64%	+3.79%

Volatility

TMO vs. T - Volatility Comparison

Thermo Fisher Scientific Inc. (TMO) has a higher volatility of 10.57% compared to AT&T Inc. (T) at 8.21%. This indicates that TMO'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

	TMO	T	Difference
Volatility (1M) Calculated over the trailing 1-month period	10.57%	8.21%	+2.36%
Volatility (6M) Calculated over the trailing 6-month period	22.27%	17.80%	+4.47%
Volatility (1Y) Calculated over the trailing 1-year period	31.48%	22.13%	+9.35%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	27.20%	24.01%	+3.19%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	26.38%	23.73%	+2.65%

Dividends

TMO vs. T - Dividend Comparison

TMO's dividend yield for the trailing twelve months is around 0.37%, less than T's 4.71% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%
TMO Thermo Fisher Scientific Inc.	0.37%	0.30%	0.30%	0.26%	0.22%	0.16%	0.19%	0.23%	0.30%	0.32%	0.43%	0.42%

Financials

Frequently Asked Questions

Can I hold both TMO and T in my portfolio?

TMO and T have a correlation of -0.05, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TMO or T?

TMO has higher volatility (10.57%) compared to T (8.21%). In terms of maximum drawdown, TMO dropped -71.16% vs T's -64.15%.

Which has better risk-adjusted returns?

TMO currently has the higher Sharpe Ratio (0.43 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.