TWVLX vs. BUFBX

Last updated Jun 25, 2026

TWVLX (American Century Value Fund) and BUFBX (Buffalo Flexible Income Fund) are both Large Cap Value Equities funds. Over the past 10 years, TWVLX returned 10.61%/yr vs 9.73%/yr for BUFBX. Their correlation of 0.82 suggests significant overlap in exposure. Both charge a 1.01% expense ratio.

Performance

TWVLX vs. BUFBX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Value Fund (TWVLX) 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, TWVLX achieves a 10.34% return, which is significantly higher than BUFBX's 9.13% return. Over the past 10 years, TWVLX has outperformed BUFBX with an annualized return of 10.61%, while BUFBX has yielded a comparatively lower 9.73% annualized return.

TWVLX

• 1D: 0.45%
• 1M: 1.08%
• YTD: 10.34%
• 6M: 9.53%
• 1Y: 22.59%
• 3Y*: 14.69%
• 5Y*: 9.85%
• 10Y*: 10.61%

BUFBX

• 1D: 0.87%
• 1M: -3.49%
• YTD: 9.13%
• 6M: 8.70%
• 1Y: 14.89%
• 3Y*: 12.74%
• 5Y*: 10.44%
• 10Y*: 9.73%

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

TWVLX vs. BUFBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TWVLX American Century Value Fund	10.34%	15.70%	9.10%	8.78%	0.39%	24.41%	0.68%	26.93%	-8.91%	8.50%
BUFBX Buffalo Flexible Income Fund	9.13%	10.37%	10.26%	7.42%	3.97%	29.97%	-2.27%	18.76%	-7.01%	13.20%

Correlation

The correlation between TWVLX and BUFBX is 0.63, 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	0.63
Correlation (3Y) Calculated over the trailing 3-year period	0.75
Correlation (5Y) Calculated over the trailing 5-year period	0.83
Correlation (10Y) Calculated over the trailing 10-year period	0.85
Correlation (All Time) Calculated using the full available price history since Aug 12, 1994	0.82

The correlation between TWVLX and BUFBX shifts across timeframes, from 0.63 (1 year) to 0.85 (10 years), reflecting how their relationship changes across market environments.

Return for Risk

TWVLX vs. BUFBX — Risk / Return Rank

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

TWVLX

TWVLX Risk / Return Rank: 72
TWVLX Sharpe Ratio Rank: 73
TWVLX Sortino Ratio Rank: 77
TWVLX Omega Ratio Rank: 66
TWVLX Calmar Ratio Rank: 80
TWVLX Martin Ratio Rank: 67

BUFBX

BUFBX Risk / Return Rank: 52
BUFBX Sharpe Ratio Rank: 39
BUFBX Sortino Ratio Rank: 37
BUFBX Omega Ratio Rank: 35
BUFBX Calmar Ratio Rank: 80
BUFBX Martin Ratio Rank: 66

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.

TWVLX vs. BUFBX - Risk-Adjusted Trends Comparison

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

	TWVLX	BUFBX	Difference
Sharpe ratio: Return per unit of total volatility	2.20	1.64	+0.55
Sortino ratio: Return per unit of downside risk	3.26	2.31	+0.95
Omega ratio: Gain probability vs. loss probability	1.39	1.28	+0.11
Calmar ratio: Return relative to maximum drawdown	3.29	3.40	-0.10
Martin ratio: Return relative to average drawdown	11.52	11.79	-0.28

TWVLX vs. BUFBX - Sharpe Ratio Comparison

The current TWVLX Sharpe Ratio is 2.20, which is higher than the BUFBX Sharpe Ratio of 1.64. The chart below compares the historical Sharpe Ratios of TWVLX 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

TWVLX vs. BUFBX - Drawdown Comparison

The maximum TWVLX drawdown since its inception was -53.19%, which is greater than BUFBX's maximum drawdown of -39.78%. Use the drawdown chart below to compare losses from any high point for TWVLX and BUFBX.

Drawdown Indicators

	TWVLX	BUFBX	Difference
Max Drawdown Largest peak-to-trough decline	-53.19%	-39.78%	-13.41%
Max Drawdown (1Y) Largest decline over 1 year	-7.03%	-4.45%	-2.58%
Max Drawdown (3Y) Largest decline over 3 years	-12.83%	-12.85%	+0.02%
Max Drawdown (5Y) Largest decline over 5 years	-17.12%	-14.67%	-2.45%
Max Drawdown (10Y) Largest decline over 10 years	-39.88%	-35.51%	-4.37%
Current Drawdown Current decline from peak	-0.89%	-3.49%	+2.60%
Average Drawdown Average peak-to-trough decline	-6.63%	-4.72%	-1.91%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.01%	1.28%	+0.73%

Volatility

TWVLX vs. BUFBX - Volatility Comparison

The current volatility for American Century Value Fund (TWVLX) is 3.03%, while Buffalo Flexible Income Fund (BUFBX) has a volatility of 3.47%. This indicates that TWVLX experiences smaller price fluctuations and is considered to be less risky than BUFBX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TWVLX	BUFBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.03%	3.47%	-0.44%
Volatility (6M) Calculated over the trailing 6-month period	7.73%	6.96%	+0.77%
Volatility (1Y) Calculated over the trailing 1-year period	10.56%	9.21%	+1.35%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.04%	13.40%	+0.64%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.67%	15.59%	+2.08%

TWVLX vs. BUFBX - Expense Ratio Comparison

Both TWVLX and BUFBX have an expense ratio of 1.01%.

Dividends

TWVLX vs. BUFBX - Dividend Comparison

TWVLX's dividend yield for the trailing twelve months is around 9.04%, more than BUFBX's 8.35% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BUFBX Buffalo Flexible Income Fund	8.35%	9.10%	3.77%	3.48%	4.16%	5.57%	3.33%	2.73%	6.01%	5.49%	2.39%	3.67%
TWVLX American Century Value Fund	9.04%	10.07%	11.14%	7.34%	15.07%	13.94%	3.49%	8.70%	11.82%	7.24%	3.22%	8.56%

Frequently Asked Questions

Can I hold both TWVLX and BUFBX in my portfolio?

TWVLX and BUFBX have a correlation of 0.63, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TWVLX or BUFBX?

BUFBX has higher volatility (3.47%) compared to TWVLX (3.03%). In terms of maximum drawdown, TWVLX dropped -53.19% vs BUFBX's -39.78%.

Which has better risk-adjusted returns?

TWVLX currently has the higher Sharpe Ratio (2.20 vs 1.64), 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.