IRVSX vs. BUFBX

Last updated Jun 5, 2026

IRVSX (Voya Russell Large Cap Value Index Portfolio Class S) and BUFBX (Buffalo Flexible Income Fund) are both Large Cap Value Equities funds. Over the past 10 years, IRVSX returned 11.23%/yr vs 9.95%/yr for BUFBX. Their correlation of 0.87 suggests significant overlap in exposure. IRVSX charges 0.59%/yr vs 1.01%/yr for BUFBX.

Performance

IRVSX vs. BUFBX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Voya Russell Large Cap Value Index Portfolio Class S (IRVSX) 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, IRVSX achieves a 13.55% return, which is significantly higher than BUFBX's 12.34% return. Over the past 10 years, IRVSX has outperformed BUFBX with an annualized return of 11.23%, while BUFBX has yielded a comparatively lower 9.95% annualized return.

IRVSX

• 1D: -0.03%
• 1M: 3.33%
• YTD: 13.55%
• 6M: 14.45%
• 1Y: 28.58%
• 3Y*: 18.45%
• 5Y*: 10.66%
• 10Y*: 11.23%

BUFBX

• 1D: -0.44%
• 1M: 2.54%
• YTD: 12.34%
• 6M: 12.43%
• 1Y: 20.10%
• 3Y*: 13.75%
• 5Y*: 10.99%
• 10Y*: 9.95%

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

IRVSX vs. BUFBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
IRVSX Voya Russell Large Cap Value Index Portfolio Class S	13.55%	17.81%	14.66%	9.98%	-5.71%	22.68%	1.11%	25.45%	-6.83%	13.20%
BUFBX Buffalo Flexible Income Fund	12.34%	10.37%	10.26%	7.42%	3.97%	29.97%	-2.27%	18.76%	-7.01%	13.20%

Correlation

The correlation between IRVSX and BUFBX is 0.44, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.44
Correlation (3Y) Calculated over the trailing 3-year period	0.67
Correlation (5Y) Calculated over the trailing 5-year period	0.79
Correlation (10Y) Calculated over the trailing 10-year period	0.84
Correlation (All Time) Calculated using the full available price history since May 5, 2009	0.87

Over the past year, the correlation between IRVSX and BUFBX has dropped to 0.44 - well below their long-term average of 0.87, suggesting their price drivers have been diverging.

Return for Risk

IRVSX vs. BUFBX — Risk / Return Rank

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

IRVSX

IRVSX Risk / Return Rank: 90
IRVSX Sharpe Ratio Rank: 92
IRVSX Sortino Ratio Rank: 90
IRVSX Omega Ratio Rank: 83
IRVSX Calmar Ratio Rank: 91
IRVSX Martin Ratio Rank: 93

BUFBX

BUFBX Risk / Return Rank: 68
BUFBX Sharpe Ratio Rank: 54
BUFBX Sortino Ratio Rank: 55
BUFBX Omega Ratio Rank: 48
BUFBX Calmar Ratio Rank: 97
BUFBX Martin Ratio Rank: 88

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.

IRVSX vs. BUFBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Voya Russell Large Cap Value Index Portfolio Class S (IRVSX) 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.

	IRVSX	BUFBX	Difference
Sharpe ratio: Return per unit of total volatility	3.05	2.18	+0.88
Sortino ratio: Return per unit of downside risk	4.42	3.11	+1.32
Omega ratio: Gain probability vs. loss probability	1.55	1.38	+0.17
Calmar ratio: Return relative to maximum drawdown	4.73	6.87	-2.14
Martin ratio: Return relative to average drawdown	19.84	16.80	+3.04
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IRVSX vs. BUFBX - Sharpe Ratio Comparison

The current IRVSX Sharpe Ratio is 3.05, which is higher than the BUFBX Sharpe Ratio of 2.18. The chart below compares the historical Sharpe Ratios of IRVSX 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.

Sharpe Ratios by Period

	IRVSX	BUFBX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.05	2.18	+0.88
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.77	0.82	-0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.68	0.64	+0.04
Sharpe Ratio (All Time) Calculated using the full available price history	0.71	0.59	+0.12

Drawdowns

IRVSX vs. BUFBX - Drawdown Comparison

The maximum IRVSX drawdown since its inception was -35.70%, smaller than the maximum BUFBX drawdown of -39.78%. Use the drawdown chart below to compare losses from any high point for IRVSX and BUFBX.

Drawdown Indicators

	IRVSX	BUFBX	Difference
Max Drawdown Largest peak-to-trough decline	-35.70%	-39.78%	+4.08%
Max Drawdown (1Y) Largest decline over 1 year	-6.70%	-2.83%	-3.87%
Max Drawdown (3Y) Largest decline over 3 years	-13.41%	-12.85%	-0.56%
Max Drawdown (5Y) Largest decline over 5 years	-18.49%	-14.67%	-3.82%
Max Drawdown (10Y) Largest decline over 10 years	-35.70%	-35.51%	-0.19%
Current Drawdown Current decline from peak	-0.03%	-0.65%	+0.62%
Average Drawdown Average peak-to-trough decline	-3.89%	-4.72%	+0.83%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.54%	1.16%	+0.38%

Volatility

IRVSX vs. BUFBX - Volatility Comparison

Voya Russell Large Cap Value Index Portfolio Class S (IRVSX) and Buffalo Flexible Income Fund (BUFBX) have volatilities of 3.25% and 3.10%, 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

	IRVSX	BUFBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.25%	3.10%	+0.15%
Volatility (6M) Calculated over the trailing 6-month period	7.90%	6.61%	+1.29%
Volatility (1Y) Calculated over the trailing 1-year period	10.39%	8.93%	+1.46%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.21%	13.40%	+0.81%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.83%	15.60%	+1.23%

IRVSX vs. BUFBX - Expense Ratio Comparison

IRVSX has a 0.59% expense ratio, which is lower than BUFBX's 1.01% expense ratio.

Dividends

IRVSX vs. BUFBX - Dividend Comparison

IRVSX's dividend yield for the trailing twelve months is around 3.63%, less than BUFBX's 8.02% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BUFBX Buffalo Flexible Income Fund	8.02%	9.10%	3.77%	3.48%	4.16%	5.57%	3.33%	2.73%	6.01%	5.49%	2.39%	3.67%
IRVSX Voya Russell Large Cap Value Index Portfolio Class S	3.63%	27.68%	3.39%	1.77%	1.19%	1.75%	3.72%	5.71%	6.06%	1.74%	2.76%	2.91%

Frequently Asked Questions

Can I hold both IRVSX and BUFBX in my portfolio?

IRVSX and BUFBX have a correlation of 0.44, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, IRVSX or BUFBX?

IRVSX has higher volatility (3.25%) compared to BUFBX (3.10%). In terms of maximum drawdown, IRVSX dropped -35.70% vs BUFBX's -39.78%.

Which has better risk-adjusted returns?

IRVSX currently has the higher Sharpe Ratio (3.05 vs 2.18), 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.