USISX vs. BUFBX

Last updated Jun 24, 2026

USISX (USAA Income Stock Fund) and BUFBX (Buffalo Flexible Income Fund) are both Large Cap Value Equities funds. Over the past 10 years, USISX returned 11.41%/yr vs 9.64%/yr for BUFBX. Their correlation of 0.83 suggests significant overlap in exposure. USISX charges 0.70%/yr vs 1.01%/yr for BUFBX.

Performance

USISX vs. BUFBX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in USAA Income Stock Fund (USISX) and Buffalo Flexible Income Fund (BUFBX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, USISX achieves a 13.78% return, which is significantly higher than BUFBX's 8.19% return. Over the past 10 years, USISX has outperformed BUFBX with an annualized return of 11.41%, while BUFBX has yielded a comparatively lower 9.64% annualized return.

USISX

• 1D: 0.73%
• 1M: 2.96%
• YTD: 13.78%
• 6M: 12.73%
• 1Y: 25.82%
• 3Y*: 17.86%
• 5Y*: 11.73%
• 10Y*: 11.41%

BUFBX

• 1D: 0.14%
• 1M: -4.32%
• YTD: 8.19%
• 6M: 8.08%
• 1Y: 14.07%
• 3Y*: 12.42%
• 5Y*: 10.40%
• 10Y*: 9.64%

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

USISX vs. BUFBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
USISX USAA Income Stock Fund	13.78%	13.44%	13.52%	12.10%	-4.42%	26.52%	0.32%	23.67%	-5.51%	16.66%
BUFBX Buffalo Flexible Income Fund	8.19%	10.37%	10.26%	7.42%	3.97%	29.97%	-2.27%	18.76%	-7.01%	13.20%

Correlation

The correlation between USISX and BUFBX is 0.68, 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	0.68
Correlation (3Y) Calculated over the trailing 3-year period	0.78
Correlation (5Y) Calculated over the trailing 5-year period	0.85
Correlation (10Y) Calculated over the trailing 10-year period	0.87
Correlation (All Time) Calculated using the full available price history since Aug 12, 1994	0.83

The correlation between USISX and BUFBX shifts across timeframes, from 0.68 (1 year) to 0.87 (10 years), reflecting how their relationship changes across market environments.

Return for Risk

USISX vs. BUFBX — Risk / Return Rank

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

USISX

USISX Risk / Return Rank: 87
USISX Sharpe Ratio Rank: 86
USISX Sortino Ratio Rank: 84
USISX Omega Ratio Rank: 77
USISX Calmar Ratio Rank: 93
USISX Martin Ratio Rank: 93

BUFBX

BUFBX Risk / Return Rank: 47
BUFBX Sharpe Ratio Rank: 35
BUFBX Sortino Ratio Rank: 33
BUFBX Omega Ratio Rank: 31
BUFBX Calmar Ratio Rank: 76
BUFBX Martin Ratio Rank: 62

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.

USISX vs. BUFBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for USAA Income Stock Fund (USISX) and Buffalo Flexible Income Fund (BUFBX). 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.

	USISX	BUFBX	Difference
Sharpe ratio: Return per unit of total volatility	2.58	1.58	+1.00
Sortino ratio: Return per unit of downside risk	3.70	2.22	+1.48
Omega ratio: Gain probability vs. loss probability	1.46	1.27	+0.18
Calmar ratio: Return relative to maximum drawdown	4.89	3.26	+1.62
Martin ratio: Return relative to average drawdown	18.14	11.49	+6.66

USISX vs. BUFBX - Sharpe Ratio Comparison

The current USISX Sharpe Ratio is 2.58, which is higher than the BUFBX Sharpe Ratio of 1.58. The chart below compares the historical Sharpe Ratios of USISX and BUFBX, 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

USISX vs. BUFBX - Drawdown Comparison

The maximum USISX drawdown since its inception was -58.46%, which is greater than BUFBX's maximum drawdown of -39.78%. Use the drawdown chart below to compare losses from any high point for USISX and BUFBX.

Drawdown Indicators

	USISX	BUFBX	Difference
Max Drawdown Largest peak-to-trough decline	-58.46%	-39.78%	-18.68%
Max Drawdown (1Y) Largest decline over 1 year	-5.51%	-4.45%	-1.06%
Max Drawdown (3Y) Largest decline over 3 years	-24.19%	-12.85%	-11.34%
Max Drawdown (5Y) Largest decline over 5 years	-24.19%	-14.67%	-9.52%
Max Drawdown (10Y) Largest decline over 10 years	-36.00%	-35.51%	-0.49%
Current Drawdown Current decline from peak	-0.80%	-4.32%	+3.52%
Average Drawdown Average peak-to-trough decline	-7.80%	-4.72%	-3.08%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.48%	1.26%	+0.22%

Volatility

USISX vs. BUFBX - Volatility Comparison

USAA Income Stock Fund (USISX) and Buffalo Flexible Income Fund (BUFBX) have volatilities of 3.27% and 3.41%, 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

	USISX	BUFBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.27%	3.41%	-0.14%
Volatility (6M) Calculated over the trailing 6-month period	7.45%	6.92%	+0.53%
Volatility (1Y) Calculated over the trailing 1-year period	10.45%	9.19%	+1.26%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.92%	13.40%	+4.52%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.06%	15.61%	+2.45%

USISX vs. BUFBX - Expense Ratio Comparison

USISX has a 0.70% expense ratio, which is lower than BUFBX's 1.01% expense ratio.

Dividends

USISX vs. BUFBX - Dividend Comparison

USISX's dividend yield for the trailing twelve months is around 8.90%, more than BUFBX's 8.42% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BUFBX Buffalo Flexible Income Fund	8.42%	9.10%	3.77%	3.48%	4.16%	5.57%	3.33%	2.73%	6.01%	5.49%	2.39%	3.67%
USISX USAA Income Stock Fund	8.90%	9.77%	18.68%	5.85%	9.94%	10.24%	2.06%	20.13%	9.01%	7.92%	2.32%	6.04%

Frequently Asked Questions

Can I hold both USISX and BUFBX in my portfolio?

USISX and BUFBX have a correlation of 0.68, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, USISX or BUFBX?

BUFBX has higher volatility (3.41%) compared to USISX (3.27%). In terms of maximum drawdown, USISX dropped -58.46% vs BUFBX's -39.78%.

Which has better risk-adjusted returns?

USISX currently has the higher Sharpe Ratio (2.58 vs 1.58), 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.