IDEF vs. FSDAX

Last updated Apr 1, 2026

Compare and contrast key facts about iShares Defense Industrials Active ETF (IDEF) and Fidelity Select Defense & Aerospace Portfolio (FSDAX).

IDEF is an actively managed fund by iShares. It was launched on May 19, 2025. FSDAX is managed by Fidelity. It was launched on May 8, 1984.

Performance

IDEF vs. FSDAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Defense Industrials Active ETF (IDEF) and Fidelity Select Defense & Aerospace Portfolio (FSDAX). The values are adjusted to include any dividend payments, if applicable.

IDEF vs. FSDAX - Yearly Performance Comparison

	2026 (YTD)	2025
IDEF iShares Defense Industrials Active ETF	6.20%	23.05%
FSDAX Fidelity Select Defense & Aerospace Portfolio	-3.56%	23.95%

Returns By Period

In the year-to-date period, IDEF achieves a 6.20% return, which is significantly higher than FSDAX's -3.56% return.

IDEF

• 1D: 4.15%
• 1M: -8.78%
• YTD: 6.20%
• 6M: 3.09%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

FSDAX

• 1D: -2.27%
• 1M: -14.26%
• YTD: -3.56%
• 6M: -1.06%
• 1Y: 34.57%
• 3Y*: 23.65%
• 5Y*: 15.00%
• 10Y*: 14.95%

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

IDEF vs. FSDAX - Expense Ratio Comparison

IDEF has a 0.55% expense ratio, which is lower than FSDAX's 0.74% expense ratio.

FSDAX

Fidelity Select Defense & Aerospace Portfolio

IDEF

iShares Defense Industrials Active ETF

Return for Risk

IDEF vs. FSDAX — Risk / Return Rank

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

FSDAX

FSDAX Risk / Return Rank: 80
FSDAX Sharpe Ratio Rank: 81
FSDAX Sortino Ratio Rank: 80
FSDAX Omega Ratio Rank: 78
FSDAX Calmar Ratio Rank: 82
FSDAX Martin Ratio Rank: 80

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.

IDEF vs. FSDAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Defense Industrials Active ETF (IDEF) and Fidelity Select Defense & Aerospace Portfolio (FSDAX). 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.

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

Sharpe Ratios by Period

	IDEF	FSDAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	—	1.48	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.76	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.68	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.85	0.63	+1.22

Correlation

The correlation between IDEF and FSDAX is 0.83, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

IDEF vs. FSDAX - Dividend Comparison

IDEF's dividend yield for the trailing twelve months is around 0.16%, less than FSDAX's 4.65% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IDEF iShares Defense Industrials Active ETF	0.16%	0.17%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
FSDAX Fidelity Select Defense & Aerospace Portfolio	4.65%	4.48%	7.68%	6.47%	8.87%	8.38%	2.11%	2.62%	11.45%	3.57%	4.87%	6.30%

Drawdowns

IDEF vs. FSDAX - Drawdown Comparison

The maximum IDEF drawdown since its inception was -14.63%, smaller than the maximum FSDAX drawdown of -60.59%. Use the drawdown chart below to compare losses from any high point for IDEF and FSDAX.

Drawdown Indicators

	IDEF	FSDAX	Difference
Max Drawdown Largest peak-to-trough decline	-14.63%	-60.59%	+45.96%
Max Drawdown (1Y) Largest decline over 1 year	—	-16.13%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-22.84%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-47.08%	—
Current Drawdown Current decline from peak	-11.08%	-16.13%	+5.05%
Average Drawdown Average peak-to-trough decline	-2.88%	-10.45%	+7.57%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	4.04%	—

Volatility

Volatility by Period

	IDEF	FSDAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	7.71%	—
Volatility (6M) Calculated over the trailing 6-month period	—	15.52%	—
Volatility (1Y) Calculated over the trailing 1-year period	20.00%	23.22%	-3.22%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.00%	19.92%	+0.08%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.00%	22.07%	-2.07%