IRON vs. SPY

Last updated Apr 1, 2026

Compare and contrast key facts about Disc Medicine Inc. (IRON) and State Street SPDR S&P 500 ETF (SPY).

SPY is a passively managed fund by State Street that tracks the performance of the S&P 500 Index. It was launched on Jan 22, 1993.

Performance

IRON vs. SPY - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Disc Medicine Inc. (IRON) and State Street SPDR S&P 500 ETF (SPY). The values are adjusted to include any dividend payments, if applicable.

IRON vs. SPY - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
IRON Disc Medicine Inc.	-19.48%	25.25%	9.76%	190.40%	-31.65%	-73.55%	6.80%
SPY State Street SPDR S&P 500 ETF	-4.37%	17.72%	24.89%	26.18%	-18.18%	28.73%	11.72%

Returns By Period

In the year-to-date period, IRON achieves a -19.48% return, which is significantly lower than SPY's -4.37% return.

IRON

• 1D: 5.20%
• 1M: -4.02%
• YTD: -19.48%
• 6M: -3.24%
• 1Y: 28.81%
• 3Y*: 44.50%
• 5Y*: -13.57%
• 10Y*: —

SPY

• 1D: 2.91%
• 1M: -4.94%
• YTD: -4.37%
• 6M: -1.82%
• 1Y: 17.59%
• 3Y*: 18.19%
• 5Y*: 11.69%
• 10Y*: 13.98%

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

Return for Risk

IRON vs. SPY — Risk / Return Rank

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

IRON

IRON Risk / Return Rank: 57
IRON Sharpe Ratio Rank: 58
IRON Sortino Ratio Rank: 56
IRON Omega Ratio Rank: 58
IRON Calmar Ratio Rank: 54
IRON Martin Ratio Rank: 56

SPY

SPY Risk / Return Rank: 64
SPY Sharpe Ratio Rank: 56
SPY Sortino Ratio Rank: 60
SPY Omega Ratio Rank: 65
SPY Calmar Ratio Rank: 65
SPY Martin Ratio Rank: 75

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.

IRON vs. SPY - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Disc Medicine Inc. (IRON) and State Street SPDR S&P 500 ETF (SPY). 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.

	IRON	SPY	Difference
Sharpe ratio Return per unit of total volatility	0.47	0.93	-0.45
Sortino ratio Return per unit of downside risk	1.04	1.45	-0.42
Omega ratio Gain probability vs. loss probability	1.15	1.22	-0.08
Calmar ratio Return relative to maximum drawdown	0.55	1.53	-0.98
Martin ratio Return relative to average drawdown	1.48	7.30	-5.82
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IRON vs. SPY - Sharpe Ratio Comparison

The current IRON Sharpe Ratio is 0.47, which is lower than the SPY Sharpe Ratio of 0.93. The chart below compares the historical Sharpe Ratios of IRON and SPY, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	IRON	SPY	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.47	0.93	-0.45
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.19	0.69	-0.88
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.78	—
Sharpe Ratio (All Time) Calculated using the full available price history	-0.12	0.56	-0.68

Correlation

The correlation between IRON and SPY is 0.22, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

IRON vs. SPY - Dividend Comparison

IRON has not paid dividends to shareholders, while SPY's dividend yield for the trailing twelve months is around 1.14%.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IRON Disc Medicine Inc.	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
SPY State Street SPDR S&P 500 ETF	1.14%	1.07%	1.21%	1.40%	1.65%	1.20%	1.52%	1.75%	2.04%	1.80%	2.03%	2.06%

Drawdowns

IRON vs. SPY - Drawdown Comparison

The maximum IRON drawdown since its inception was -93.22%, which is greater than SPY's maximum drawdown of -55.19%. Use the drawdown chart below to compare losses from any high point for IRON and SPY.

Drawdown Indicators

	IRON	SPY	Difference
Max Drawdown Largest peak-to-trough decline	-93.22%	-55.19%	-38.03%
Max Drawdown (1Y) Largest decline over 1 year	-40.55%	-12.05%	-28.50%
Max Drawdown (5Y) Largest decline over 5 years	-91.30%	-24.50%	-66.80%
Max Drawdown (10Y) Largest decline over 10 years	—	-33.72%	—
Current Drawdown Current decline from peak	-64.48%	-6.24%	-58.24%
Average Drawdown Average peak-to-trough decline	-66.62%	-9.09%	-57.53%
Ulcer Index Depth and duration of drawdowns from previous peaks	14.93%	2.52%	+12.41%

Volatility

IRON vs. SPY - Volatility Comparison

Disc Medicine Inc. (IRON) has a higher volatility of 14.62% compared to State Street SPDR S&P 500 ETF (SPY) at 5.31%. This indicates that IRON's price experiences larger fluctuations and is considered to be riskier than SPY based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	IRON	SPY	Difference
Volatility (1M) Calculated over the trailing 1-month period	14.62%	5.31%	+9.31%
Volatility (6M) Calculated over the trailing 6-month period	47.93%	9.47%	+38.46%
Volatility (1Y) Calculated over the trailing 1-year period	61.21%	19.05%	+42.16%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	72.60%	17.06%	+55.54%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	70.40%	17.92%	+52.48%