TBWIX vs. BUFIX

Last updated Jun 24, 2026

TBWIX (Thornburg Better World International Fund) and BUFIX (Buffalo International Fund) are both Foreign Large Cap Equities funds. Over the past 10 years, TBWIX returned 10.97%/yr vs 11.18%/yr for BUFIX. Their correlation of 0.83 suggests significant overlap in exposure. TBWIX charges 1.21%/yr vs 1.03%/yr for BUFIX.

Performance

TBWIX vs. BUFIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Thornburg Better World International Fund (TBWIX) and Buffalo International Fund (BUFIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, TBWIX achieves a 2.89% return, which is significantly lower than BUFIX's 21.21% return. Both investments have delivered pretty close results over the past 10 years, with TBWIX having a 10.97% annualized return and BUFIX not far ahead at 11.18%.

TBWIX

• 1D: -0.30%
• 1M: -0.09%
• YTD: 2.89%
• 6M: 2.30%
• 1Y: 13.73%
• 3Y*: 11.73%
• 5Y*: 4.51%
• 10Y*: 10.97%

BUFIX

• 1D: 0.42%
• 1M: 7.30%
• YTD: 21.21%
• 6M: 21.62%
• 1Y: 24.99%
• 3Y*: 13.15%
• 5Y*: 6.59%
• 10Y*: 11.18%

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

TBWIX vs. BUFIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TBWIX Thornburg Better World International Fund	2.89%	24.25%	7.10%	12.72%	-18.02%	20.88%	26.67%	24.57%	-13.61%	22.88%
BUFIX Buffalo International Fund	21.21%	17.09%	-1.90%	18.33%	-21.80%	18.20%	19.10%	28.01%	-8.85%	29.33%

Correlation

The correlation between TBWIX and BUFIX is 0.73, 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	0.73
Correlation (3Y) Calculated over the trailing 3-year period	0.80
Correlation (5Y) Calculated over the trailing 5-year period	0.82
Correlation (10Y) Calculated over the trailing 10-year period	0.83
Correlation (All Time) Calculated using the full available price history since Jan 4, 2016	0.83

The correlation between TBWIX and BUFIX has been stable across timeframes, ranging from 0.73 to 0.83 - a consistent structural relationship.

Return for Risk

TBWIX vs. BUFIX — Risk / Return Rank

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

TBWIX

TBWIX Risk / Return Rank: 15
TBWIX Sharpe Ratio Rank: 16
TBWIX Sortino Ratio Rank: 16
TBWIX Omega Ratio Rank: 16
TBWIX Calmar Ratio Rank: 13
TBWIX Martin Ratio Rank: 15

BUFIX

BUFIX Risk / Return Rank: 30
BUFIX Sharpe Ratio Rank: 28
BUFIX Sortino Ratio Rank: 25
BUFIX Omega Ratio Rank: 29
BUFIX Calmar Ratio Rank: 33
BUFIX Martin Ratio Rank: 33

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.

TBWIX vs. BUFIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Thornburg Better World International Fund (TBWIX) and Buffalo International Fund (BUFIX). 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.

	TBWIX	BUFIX	Difference
Sharpe ratio: Return per unit of total volatility	1.04	1.39	-0.35
Sortino ratio: Return per unit of downside risk	1.53	1.94	-0.41
Omega ratio: Gain probability vs. loss probability	1.19	1.26	-0.07
Calmar ratio: Return relative to maximum drawdown	1.13	2.03	-0.90
Martin ratio: Return relative to average drawdown	3.77	7.02	-3.25

TBWIX vs. BUFIX - Sharpe Ratio Comparison

The current TBWIX Sharpe Ratio is 1.04, which is comparable to the BUFIX Sharpe Ratio of 1.39. The chart below compares the historical Sharpe Ratios of TBWIX and BUFIX, 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

TBWIX vs. BUFIX - Drawdown Comparison

The maximum TBWIX drawdown since its inception was -40.11%, smaller than the maximum BUFIX drawdown of -55.09%. Use the drawdown chart below to compare losses from any high point for TBWIX and BUFIX.

Drawdown Indicators

	TBWIX	BUFIX	Difference
Max Drawdown Largest peak-to-trough decline	-40.11%	-55.09%	+14.98%
Max Drawdown (1Y) Largest decline over 1 year	-12.01%	-12.85%	+0.84%
Max Drawdown (3Y) Largest decline over 3 years	-12.49%	-15.52%	+3.03%
Max Drawdown (5Y) Largest decline over 5 years	-40.11%	-34.93%	-5.18%
Max Drawdown (10Y) Largest decline over 10 years	-40.11%	-34.93%	-5.18%
Current Drawdown Current decline from peak	-3.86%	0.00%	-3.86%
Average Drawdown Average peak-to-trough decline	-10.19%	-9.15%	-1.04%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.59%	3.71%	-0.12%

Volatility

TBWIX vs. BUFIX - Volatility Comparison

The current volatility for Thornburg Better World International Fund (TBWIX) is 3.44%, while Buffalo International Fund (BUFIX) has a volatility of 8.83%. This indicates that TBWIX experiences smaller price fluctuations and is considered to be less risky than BUFIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TBWIX	BUFIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.44%	8.83%	-5.39%
Volatility (6M) Calculated over the trailing 6-month period	10.53%	16.71%	-6.18%
Volatility (1Y) Calculated over the trailing 1-year period	13.08%	18.84%	-5.76%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.30%	17.91%	-0.61%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.86%	17.66%	-0.80%

TBWIX vs. BUFIX - Expense Ratio Comparison

TBWIX has a 1.21% expense ratio, which is higher than BUFIX's 1.03% expense ratio.

Dividends

TBWIX vs. BUFIX - Dividend Comparison

TBWIX's dividend yield for the trailing twelve months is around 1.48%, more than BUFIX's 0.70% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BUFIX Buffalo International Fund	0.70%	0.85%	0.84%	0.59%	1.85%	1.20%	0.28%	0.57%	2.42%	0.36%	0.00%	0.51%
TBWIX Thornburg Better World International Fund	1.48%	1.53%	1.40%	1.55%	0.87%	15.10%	0.40%	1.17%	10.14%	3.53%	5.99%	0.00%

Frequently Asked Questions

Can I hold both TBWIX and BUFIX in my portfolio?

TBWIX and BUFIX have a correlation of 0.73, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TBWIX or BUFIX?

BUFIX has higher volatility (8.83%) compared to TBWIX (3.44%). In terms of maximum drawdown, TBWIX dropped -40.11% vs BUFIX's -55.09%.

Which has better risk-adjusted returns?

BUFIX currently has the higher Sharpe Ratio (1.39 vs 1.04), 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.