QMCO vs. ARQQ

Last updated Jun 24, 2026

QMCO (Quantum Corporation) and ARQQ (Arqit Quantum Inc.) are both stocks. Both are in the Technology sector — QMCO in Computer Hardware, ARQQ in Software - Infrastructure. Over the past 3 years, QMCO returned -13.85%/yr vs -0.52%/yr for ARQQ. At a 0.30 correlation, their price movements are largely independent.

Performance

QMCO vs. ARQQ - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Quantum Corporation (QMCO) and Arqit Quantum Inc. (ARQQ). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, QMCO achieves a 114.11% return, which is significantly higher than ARQQ's 32.72% return.

QMCO

• 1D: -1.64%
• 1M: 52.60%
• YTD: 114.11%
• 6M: 90.75%
• 1Y: 68.62%
• 3Y*: -13.85%
• 5Y*: -36.88%
• 10Y*: -15.25%

ARQQ

• 1D: 35.57%
• 1M: 66.04%
• YTD: 32.72%
• 6M: 14.69%
• 1Y: -24.73%
• 3Y*: -0.52%
• 5Y*: —
• 10Y*: —

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

QMCO vs. ARQQ - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
QMCO Quantum Corporation	114.11%	-88.04%	672.49%	-67.98%	-80.25%	-7.07%
ARQQ Arqit Quantum Inc.	32.72%	-43.67%	227.76%	-86.87%	-84.93%	158.92%

Correlation

The correlation between QMCO and ARQQ is 0.55, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.55
Correlation (3Y) Calculated over the trailing 3-year period	0.41
Correlation (All Time) Calculated using the full available price history since Sep 7, 2021	0.30

Over the past year, QMCO and ARQQ have become more correlated (0.55) than their long-term average of 0.30, meaning their price movements have been converging.

Fundamentals

Market Cap QMCO : $189.05M ARQQ : $481.51M
EPS QMCO : -$8.86 ARQQ : -$4.72
PS Ratio QMCO : 0.60 ARQQ : 324.08
Total Revenue (TTM) QMCO : $261.28M ARQQ : $1.43M
Gross Profit (TTM) QMCO : $97.87M ARQQ : -$307.00K
EBITDA (TTM) QMCO : -$51.03M ARQQ : -$68.30M

Return for Risk

QMCO vs. ARQQ — Risk / Return Rank

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

QMCO

QMCO Risk / Return Rank: 65
QMCO Sharpe Ratio Rank: 64
QMCO Sortino Ratio Rank: 71
QMCO Omega Ratio Rank: 67
QMCO Calmar Ratio Rank: 63
QMCO Martin Ratio Rank: 61

ARQQ

ARQQ Risk / Return Rank: 37
ARQQ Sharpe Ratio Rank: 33
ARQQ Sortino Ratio Rank: 43
ARQQ Omega Ratio Rank: 41
ARQQ Calmar Ratio Rank: 33
ARQQ Martin Ratio Rank: 35

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.

QMCO vs. ARQQ - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Quantum Corporation (QMCO) and Arqit Quantum Inc. (ARQQ). 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.

	QMCO	ARQQ	Difference
Sharpe ratio: Return per unit of total volatility	0.66	-0.22	+0.89
Sortino ratio: Return per unit of downside risk	1.69	0.46	+1.23
Omega ratio: Gain probability vs. loss probability	1.20	1.05	+0.15
Calmar ratio: Return relative to maximum drawdown	1.02	-0.31	+1.33
Martin ratio: Return relative to average drawdown	1.79	-0.45	+2.25

QMCO vs. ARQQ - Sharpe Ratio Comparison

The current QMCO Sharpe Ratio is 0.66, which is higher than the ARQQ Sharpe Ratio of -0.22. The chart below compares the historical Sharpe Ratios of QMCO and ARQQ, 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

QMCO vs. ARQQ - Drawdown Comparison

The maximum QMCO drawdown since its inception was -99.93%, roughly equal to the maximum ARQQ drawdown of -99.60%. Use the drawdown chart below to compare losses from any high point for QMCO and ARQQ.

Drawdown Indicators

	QMCO	ARQQ	Difference
Max Drawdown Largest peak-to-trough decline	-99.93%	-99.60%	-0.33%
Max Drawdown (1Y) Largest decline over 1 year	-67.72%	-79.78%	+12.06%
Max Drawdown (3Y) Largest decline over 3 years	-93.90%	-89.69%	-4.21%
Max Drawdown (5Y) Largest decline over 5 years	-98.26%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-98.67%	—	—
Current Drawdown Current decline from peak	-99.60%	-96.95%	-2.65%
Average Drawdown Average peak-to-trough decline	-88.09%	-88.82%	+0.73%
Ulcer Index Depth and duration of drawdowns from previous peaks	38.38%	54.58%	-16.20%

Volatility

QMCO vs. ARQQ - Volatility Comparison

The current volatility for Quantum Corporation (QMCO) is 41.79%, while Arqit Quantum Inc. (ARQQ) has a volatility of 52.32%. This indicates that QMCO experiences smaller price fluctuations and is considered to be less risky than ARQQ based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	QMCO	ARQQ	Difference
Volatility (1M) Calculated over the trailing 1-month period	41.79%	52.32%	-10.53%
Volatility (6M) Calculated over the trailing 6-month period	72.76%	77.49%	-4.73%
Volatility (1Y) Calculated over the trailing 1-year period	104.15%	111.73%	-7.58%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	159.55%	135.94%	+23.61%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	125.05%	135.94%	-10.89%

Dividends

QMCO vs. ARQQ - Dividend Comparison

Neither QMCO nor ARQQ has paid dividends to shareholders.

Tickers have no history of dividend payments

Financials

Frequently Asked Questions

Can I hold both QMCO and ARQQ in my portfolio?

QMCO and ARQQ have a correlation of 0.55, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, QMCO or ARQQ?

ARQQ has higher volatility (52.32%) compared to QMCO (41.79%). In terms of maximum drawdown, QMCO dropped -99.93% vs ARQQ's -99.60%.

Which has better risk-adjusted returns?

QMCO currently has the higher Sharpe Ratio (0.66 vs -0.22), 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.