KOS vs. MRO

Last updated Jun 3, 2026

KOS (Kosmos Energy Ltd.) and MRO (Marathon Oil Corporation) are both stocks. Both operate in the Oil & Gas E&P industry within the Energy sector. A 0.58 correlation means they provide meaningful diversification when combined.

Performance

KOS vs. MRO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Kosmos Energy Ltd. (KOS) and Marathon Oil Corporation (MRO). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

KOS

• 1D: 2.06%
• 1M: -7.19%
• YTD: 227.31%
• 6M: 177.57%
• 1Y: 68.75%
• 3Y*: -23.33%
• 5Y*: -2.55%
• 10Y*: -5.74%

MRO

• 1D: —
• 1M: —
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

KOS vs. MRO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
KOS Kosmos Energy Ltd.	227.31%	-73.47%	-49.03%	5.50%	83.82%	47.23%	-58.06%	44.22%	-40.58%	-2.28%
MRO Marathon Oil Corporation	0.00%	0.00%	20.15%	-9.29%	66.91%	149.77%	-50.38%	-3.93%	-14.37%	-0.82%

Correlation

The correlation between KOS and MRO is 0.58, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (3Y) Calculated over the trailing 3-year period	0.37
Correlation (5Y) Calculated over the trailing 5-year period	0.56
Correlation (10Y) Calculated over the trailing 10-year period	0.59
Correlation (All Time) Calculated using the full available price history since May 12, 2011	0.58

The correlation between KOS and MRO shifts across timeframes, from 0.37 (3 years) to 0.59 (10 years), reflecting how their relationship changes across market environments.

Fundamentals

Total Revenue (TTM) KOS : $1.37B MRO : $6.58B
Gross Profit (TTM) KOS : $10.14M MRO : $3.50B
EBITDA (TTM) KOS : $95.79M MRO : $4.23B

Return for Risk

KOS vs. MRO — Risk / Return Rank

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

KOS

KOS Risk / Return Rank: 65
KOS Sharpe Ratio Rank: 66
KOS Sortino Ratio Rank: 68
KOS Omega Ratio Rank: 63
KOS Calmar Ratio Rank: 64
KOS Martin Ratio Rank: 63

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.

KOS vs. MRO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Kosmos Energy Ltd. (KOS) and Marathon Oil Corporation (MRO). 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.

	KOS	MRO	Difference
Sharpe ratio Return per unit of total volatility	0.80	—	—
Sortino ratio Return per unit of downside risk	1.66	—	—
Omega ratio Gain probability vs. loss probability	1.19	—	—
Calmar ratio Return relative to maximum drawdown	1.24	—	—
Martin ratio Return relative to average drawdown	2.53	—	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

Sharpe Ratios by Period

	KOS	MRO	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.80	—	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.04	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.07	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	-0.17	—	—

Drawdowns

Drawdown Indicators

	KOS	MRO	Difference
Max Drawdown Largest peak-to-trough decline	-97.11%	—	—
Max Drawdown (1Y) Largest decline over 1 year	-63.57%	—	—
Max Drawdown (3Y) Largest decline over 3 years	-89.39%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-89.82%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-94.28%	—	—
Current Drawdown Current decline from peak	-83.83%	—	—
Average Drawdown Average peak-to-trough decline	-64.53%	—	—
Ulcer Index Depth and duration of drawdowns from previous peaks	31.19%	—	—

Volatility

Volatility by Period

	KOS	MRO	Difference
Volatility (1M) Calculated over the trailing 1-month period	21.94%	—	—
Volatility (6M) Calculated over the trailing 6-month period	71.11%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	86.47%	—	—
Volatility (5Y) Calculated over the trailing 5-year period, annualized	70.22%	—	—
Volatility (10Y) Calculated over the trailing 10-year period, annualized	76.93%	—	—

Dividends

KOS vs. MRO - Dividend Comparison

Neither KOS nor MRO has paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
KOS Kosmos Energy Ltd.	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	1.92%	3.17%	0.00%	0.00%	0.00%	0.00%
MRO Marathon Oil Corporation	0.00%	0.00%	1.54%	1.70%	1.18%	1.10%	1.20%	1.47%	1.39%	1.18%	1.16%	5.40%

Financials

Frequently Asked Questions

Can I hold both KOS and MRO in my portfolio?

KOS and MRO have a correlation of 0.58, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.