SPIDX vs. BSPGX

Last updated Jun 4, 2026

SPIDX (Invesco S&P 500 Index Fund) and BSPGX (iShares S&P 500 Index Fund Class G) are both S&P 500 funds tracking the S&P 500 Index, from Invesco and iShares respectively. Both are passively managed. Over the past 5 years, SPIDX returned 13.96%/yr vs 14.26%/yr for BSPGX. With a 0.99 correlation, they move nearly in lockstep. SPIDX charges 0.29%/yr vs 0.01%/yr for BSPGX.

Performance

SPIDX vs. BSPGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco S&P 500 Index Fund (SPIDX) and iShares S&P 500 Index Fund Class G (BSPGX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with SPIDX having a 11.58% return and BSPGX slightly higher at 11.70%.

SPIDX

• 1D: 0.14%
• 1M: 5.78%
• YTD: 11.58%
• 6M: 11.63%
• 1Y: 28.68%
• 3Y*: 22.41%
• 5Y*: 13.96%
• 10Y*: 15.33%

BSPGX

• 1D: 0.13%
• 1M: 5.80%
• YTD: 11.70%
• 6M: 11.73%
• 1Y: 28.95%
• 3Y*: 22.73%
• 5Y*: 14.26%
• 10Y*: —

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

SPIDX vs. BSPGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
SPIDX Invesco S&P 500 Index Fund	11.58%	17.54%	24.65%	25.95%	-18.36%	28.30%	18.13%	9.56%
BSPGX iShares S&P 500 Index Fund Class G	11.70%	17.85%	24.96%	26.27%	-18.12%	28.66%	19.16%	11.06%

Correlation

The correlation between SPIDX and BSPGX is 1.00 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	1.00
Correlation (3Y) Calculated over the trailing 3-year period	1.00
Correlation (5Y) Calculated over the trailing 5-year period	1.00
Correlation (All Time) Calculated using the full available price history since Jul 3, 2019	0.99

The correlation between SPIDX and BSPGX has been stable across timeframes, ranging from 0.99 to 1.00 - a consistent structural relationship.

Return for Risk

SPIDX vs. BSPGX — Risk / Return Rank

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

SPIDX

SPIDX Risk / Return Rank: 72
SPIDX Sharpe Ratio Rank: 74
SPIDX Sortino Ratio Rank: 66
SPIDX Omega Ratio Rank: 66
SPIDX Calmar Ratio Rank: 73
SPIDX Martin Ratio Rank: 82

BSPGX

BSPGX Risk / Return Rank: 73
BSPGX Sharpe Ratio Rank: 76
BSPGX Sortino Ratio Rank: 67
BSPGX Omega Ratio Rank: 67
BSPGX Calmar Ratio Rank: 73
BSPGX Martin Ratio Rank: 83

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.

SPIDX vs. BSPGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco S&P 500 Index Fund (SPIDX) and iShares S&P 500 Index Fund Class G (BSPGX). 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.

	SPIDX	BSPGX	Difference
Sharpe ratio: Return per unit of total volatility	2.50	2.52	-0.02
Sortino ratio: Return per unit of downside risk	3.40	3.42	-0.02
Omega ratio: Gain probability vs. loss probability	1.45	1.46	0.00
Calmar ratio: Return relative to maximum drawdown	3.32	3.35	-0.03
Martin ratio: Return relative to average drawdown	15.49	15.67	-0.19
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SPIDX vs. BSPGX - Sharpe Ratio Comparison

The current SPIDX Sharpe Ratio is 2.50, which is comparable to the BSPGX Sharpe Ratio of 2.52. The chart below compares the historical Sharpe Ratios of SPIDX and BSPGX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	SPIDX	BSPGX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.50	2.52	-0.02
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.83	0.85	-0.02
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.85	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.47	0.83	-0.36

Drawdowns

SPIDX vs. BSPGX - Drawdown Comparison

The maximum SPIDX drawdown since its inception was -55.30%, which is greater than BSPGX's maximum drawdown of -33.74%. Use the drawdown chart below to compare losses from any high point for SPIDX and BSPGX.

Drawdown Indicators

	SPIDX	BSPGX	Difference
Max Drawdown Largest peak-to-trough decline	-55.30%	-33.74%	-21.56%
Max Drawdown (1Y) Largest decline over 1 year	-8.93%	-8.90%	-0.03%
Max Drawdown (3Y) Largest decline over 3 years	-18.81%	-18.73%	-0.08%
Max Drawdown (5Y) Largest decline over 5 years	-24.66%	-24.50%	-0.16%
Max Drawdown (10Y) Largest decline over 10 years	-33.84%	—	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-10.51%	-5.09%	-5.42%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.91%	1.90%	+0.01%

Volatility

SPIDX vs. BSPGX - Volatility Comparison

Invesco S&P 500 Index Fund (SPIDX) and iShares S&P 500 Index Fund Class G (BSPGX) have volatilities of 2.82% and 2.82%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SPIDX	BSPGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.82%	2.82%	0.00%
Volatility (6M) Calculated over the trailing 6-month period	8.99%	8.97%	+0.02%
Volatility (1Y) Calculated over the trailing 1-year period	11.89%	11.85%	+0.04%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.91%	16.88%	+0.03%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.09%	20.01%	-1.92%

SPIDX vs. BSPGX - Expense Ratio Comparison

SPIDX has a 0.29% expense ratio, which is higher than BSPGX's 0.01% expense ratio.

Dividends

SPIDX vs. BSPGX - Dividend Comparison

SPIDX's dividend yield for the trailing twelve months is around 0.96%, less than BSPGX's 1.58% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BSPGX iShares S&P 500 Index Fund Class G	1.58%	1.74%	1.43%	1.52%	2.04%	1.83%	2.09%	2.25%	0.00%	0.00%	0.00%	0.00%
SPIDX Invesco S&P 500 Index Fund	0.96%	1.07%	1.28%	1.23%	1.14%	2.09%	1.45%	2.11%	2.82%	1.49%	1.49%	1.74%

Frequently Asked Questions

Can I hold both SPIDX and BSPGX in my portfolio?

With a correlation of 1.00, SPIDX and BSPGX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, SPIDX or BSPGX?

BSPGX has higher volatility (2.82%) compared to SPIDX (2.82%). In terms of maximum drawdown, SPIDX dropped -55.30% vs BSPGX's -33.74%.

Which has better risk-adjusted returns?

BSPGX currently has the higher Sharpe Ratio (2.52 vs 2.50), 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.