TWBIX vs. SPY

Last updated Jun 4, 2026

TWBIX (American Century Balanced Fund) and SPY (State Street SPDR S&P 500 ETF) are both funds - TWBIX is a Diversified Portfolio fund managed by American Century, while SPY is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, TWBIX returned 8.31%/yr vs 15.49%/yr for SPY. Their correlation of 0.93 suggests significant overlap in exposure. TWBIX charges 0.91%/yr vs 0.09%/yr for SPY.

Performance

TWBIX vs. SPY - Performance Comparison

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

Returns By Period

In the year-to-date period, TWBIX achieves a 5.33% return, which is significantly lower than SPY's 10.91% return. Over the past 10 years, TWBIX has underperformed SPY with an annualized return of 8.31%, while SPY has yielded a comparatively higher 15.49% annualized return.

TWBIX

• 1D: 0.13%
• 1M: 3.10%
• YTD: 5.33%
• 6M: 4.96%
• 1Y: 15.30%
• 3Y*: 11.79%
• 5Y*: 6.06%
• 10Y*: 8.31%

SPY

• 1D: -0.70%
• 1M: 5.05%
• YTD: 10.91%
• 6M: 10.91%
• 1Y: 27.98%
• 3Y*: 22.35%
• 5Y*: 13.83%
• 10Y*: 15.49%

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

TWBIX vs. SPY - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TWBIX American Century Balanced Fund	5.33%	9.60%	11.93%	16.18%	-17.34%	16.32%	12.62%	19.65%	-3.46%	14.04%
SPY State Street SPDR S&P 500 ETF	10.91%	17.72%	24.89%	26.18%	-18.18%	28.73%	18.33%	31.22%	-4.57%	21.71%

Correlation

The correlation between TWBIX and SPY is 0.96 - 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	0.96
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (10Y) Calculated over the trailing 10-year period	0.96
Correlation (All Time) Calculated using the full available price history since Feb 1, 1993	0.93

The correlation between TWBIX and SPY has been stable across timeframes, ranging from 0.93 to 0.96 - a consistent structural relationship.

Return for Risk

TWBIX vs. SPY — Risk / Return Rank

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

TWBIX

TWBIX Risk / Return Rank: 48
TWBIX Sharpe Ratio Rank: 47
TWBIX Sortino Ratio Rank: 47
TWBIX Omega Ratio Rank: 47
TWBIX Calmar Ratio Rank: 42
TWBIX Martin Ratio Rank: 55

SPY

SPY Risk / Return Rank: 70
SPY Sharpe Ratio Rank: 71
SPY Sortino Ratio Rank: 69
SPY Omega Ratio Rank: 70
SPY Calmar Ratio Rank: 62
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.

TWBIX vs. SPY - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Balanced Fund (TWBIX) 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.

	TWBIX	SPY	Difference
Sharpe ratio: Return per unit of total volatility	2.02	2.38	-0.36
Sortino ratio: Return per unit of downside risk	2.89	3.24	-0.35
Omega ratio: Gain probability vs. loss probability	1.37	1.43	-0.06
Calmar ratio: Return relative to maximum drawdown	2.45	3.16	-0.71
Martin ratio: Return relative to average drawdown	11.16	14.72	-3.56
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TWBIX vs. SPY - Sharpe Ratio Comparison

The current TWBIX Sharpe Ratio is 2.02, which is comparable to the SPY Sharpe Ratio of 2.38. The chart below compares the historical Sharpe Ratios of TWBIX and SPY, 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

	TWBIX	SPY	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.02	2.38	-0.36
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.55	0.82	-0.26
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.76	0.87	-0.10
Sharpe Ratio (All Time) Calculated using the full available price history	0.70	0.59	+0.12

Drawdowns

TWBIX vs. SPY - Drawdown Comparison

The maximum TWBIX drawdown since its inception was -33.88%, smaller than the maximum SPY drawdown of -55.19%. Use the drawdown chart below to compare losses from any high point for TWBIX and SPY.

Drawdown Indicators

	TWBIX	SPY	Difference
Max Drawdown Largest peak-to-trough decline	-33.88%	-55.19%	+21.31%
Max Drawdown (1Y) Largest decline over 1 year	-6.46%	-8.88%	+2.42%
Max Drawdown (3Y) Largest decline over 3 years	-12.70%	-18.76%	+6.06%
Max Drawdown (5Y) Largest decline over 5 years	-22.48%	-24.50%	+2.02%
Max Drawdown (10Y) Largest decline over 10 years	-22.48%	-33.72%	+11.24%
Current Drawdown Current decline from peak	0.00%	-0.70%	+0.70%
Average Drawdown Average peak-to-trough decline	-4.71%	-9.05%	+4.34%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.42%	1.91%	-0.49%

Volatility

TWBIX vs. SPY - Volatility Comparison

The current volatility for American Century Balanced Fund (TWBIX) is 2.15%, while State Street SPDR S&P 500 ETF (SPY) has a volatility of 2.84%. This indicates that TWBIX experiences smaller price fluctuations and is considered to be less risky than SPY based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TWBIX	SPY	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.15%	2.84%	-0.69%
Volatility (6M) Calculated over the trailing 6-month period	6.17%	8.90%	-2.73%
Volatility (1Y) Calculated over the trailing 1-year period	7.86%	11.83%	-3.97%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	11.00%	17.05%	-6.05%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	10.92%	17.94%	-7.02%

TWBIX vs. SPY - Expense Ratio Comparison

TWBIX has a 0.91% expense ratio, which is higher than SPY's 0.09% expense ratio.

Dividends

TWBIX vs. SPY - Dividend Comparison

TWBIX's dividend yield for the trailing twelve months is around 1.56%, more than SPY's 0.98% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SPY State Street SPDR S&P 500 ETF	0.98%	1.07%	1.21%	1.40%	1.65%	1.20%	1.52%	1.75%	2.04%	1.80%	2.03%	2.06%
TWBIX American Century Balanced Fund	1.56%	1.71%	1.85%	1.70%	1.34%	21.54%	6.22%	5.04%	8.12%	5.99%	2.41%	6.24%

Frequently Asked Questions

Can I hold both TWBIX and SPY in my portfolio?

With a correlation of 0.96, TWBIX and SPY 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, TWBIX or SPY?

SPY has higher volatility (2.84%) compared to TWBIX (2.15%). In terms of maximum drawdown, TWBIX dropped -33.88% vs SPY's -55.19%.

Which has better risk-adjusted returns?

SPY currently has the higher Sharpe Ratio (2.38 vs 2.02), 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.