TIBIX vs. BRUFX

Last updated Jul 15, 2026

TIBIX (Thornburg Investment Income Builder Fund Class I) and BRUFX (Bruce Fund) are both Diversified Portfolio funds. Over the past 10 years, TIBIX returned 12.29%/yr vs 7.63%/yr for BRUFX. A 0.60 correlation means they provide meaningful diversification when combined. TIBIX charges 0.93%/yr vs 0.68%/yr for BRUFX.

Performance

TIBIX vs. BRUFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Thornburg Investment Income Builder Fund Class I (TIBIX) and Bruce Fund (BRUFX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with TIBIX having a 16.12% return and BRUFX slightly lower at 15.52%. Over the past 10 years, TIBIX has outperformed BRUFX with an annualized return of 12.29%, while BRUFX has yielded a comparatively lower 7.63% annualized return.

TIBIX

• 1D: -0.03%
• 1M: -1.38%
• 6M: 13.72%
• YTD: 16.12%
• 1Y: 32.36%
• 3Y*: 24.78%
• 5Y*: 16.27%
• 10Y*: 12.29%

BRUFX

• 1D: 0.17%
• 1M: 3.61%
• 6M: 12.43%
• YTD: 15.52%
• 1Y: 26.52%
• 3Y*: 12.44%
• 5Y*: 5.97%
• 10Y*: 7.63%

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

TIBIX vs. BRUFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TIBIX Thornburg Investment Income Builder Fund Class I	16.12%	37.01%	13.48%	18.28%	-7.69%	20.36%	-0.40%	18.01%	-4.31%	15.23%
BRUFX Bruce Fund	15.52%	14.89%	4.45%	-0.74%	-8.80%	17.35%	12.06%	22.42%	-3.99%	12.48%

Correlation

The correlation between TIBIX and BRUFX is 0.52, 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	0.52
Correlation (3Y) Calculated over the trailing 3-year period	0.56
Correlation (5Y) Calculated over the trailing 5-year period	0.61
Correlation (10Y) Calculated over the trailing 10-year period	0.60
Correlation (All Time) Calculated using the full available price history since Nov 3, 2003	0.60

The correlation between TIBIX and BRUFX has been stable across timeframes, ranging from 0.52 to 0.61 - a consistent structural relationship.

Return for Risk

TIBIX vs. BRUFX — Risk / Return Rank

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

TIBIX

TIBIX Risk / Return Rank: 97
TIBIX Sharpe Ratio Rank: 99
TIBIX Sortino Ratio Rank: 98
TIBIX Omega Ratio Rank: 96
TIBIX Calmar Ratio Rank: 97
TIBIX Martin Ratio Rank: 97

BRUFX

BRUFX Risk / Return Rank: 89
BRUFX Sharpe Ratio Rank: 92
BRUFX Sortino Ratio Rank: 88
BRUFX Omega Ratio Rank: 84
BRUFX Calmar Ratio Rank: 89
BRUFX Martin Ratio Rank: 94

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.

TIBIX vs. BRUFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Thornburg Investment Income Builder Fund Class I (TIBIX) and Bruce Fund (BRUFX). 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.

	TIBIX	BRUFX	Difference
Sharpe ratio: Return per unit of total volatility	3.66	2.50	+1.16
Sortino ratio: Return per unit of downside risk	5.24	3.56	+1.68
Omega ratio: Gain probability vs. loss probability	1.71	1.44	+0.27
Calmar ratio: Return relative to maximum drawdown	6.06	3.49	+2.56
Martin ratio: Return relative to average drawdown	22.40	15.51	+6.89

TIBIX vs. BRUFX - Sharpe Ratio Comparison

The current TIBIX Sharpe Ratio is 3.66, which is higher than the BRUFX Sharpe Ratio of 2.50. The chart below compares the historical Sharpe Ratios of TIBIX and BRUFX, 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

TIBIX vs. BRUFX - Drawdown Comparison

The maximum TIBIX drawdown since its inception was -48.88%, which is greater than BRUFX's maximum drawdown of -44.50%. Use the drawdown chart below to compare losses from any high point for TIBIX and BRUFX.

Drawdown Indicators

	TIBIX	BRUFX	Difference
Max Drawdown Largest peak-to-trough decline	-48.88%	-44.50%	-4.38%
Max Drawdown (1Y) Largest decline over 1 year	-5.39%	-7.67%	+2.28%
Max Drawdown (3Y) Largest decline over 3 years	-9.23%	-9.66%	+0.43%
Max Drawdown (5Y) Largest decline over 5 years	-20.79%	-17.91%	-2.88%
Max Drawdown (10Y) Largest decline over 10 years	-34.85%	-25.44%	-9.41%
Current Drawdown Current decline from peak	-1.56%	-0.69%	-0.87%
Average Drawdown Average peak-to-trough decline	-5.94%	-9.05%	+3.11%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.45%	1.72%	-0.27%

Volatility

TIBIX vs. BRUFX - Volatility Comparison

The current volatility for Thornburg Investment Income Builder Fund Class I (TIBIX) is 2.58%, while Bruce Fund (BRUFX) has a volatility of 3.06%. This indicates that TIBIX experiences smaller price fluctuations and is considered to be less risky than BRUFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TIBIX	BRUFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.58%	3.06%	-0.48%
Volatility (6M) Calculated over the trailing 6-month period	7.32%	8.41%	-1.09%
Volatility (1Y) Calculated over the trailing 1-year period	8.93%	10.75%	-1.82%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	11.19%	10.57%	+0.62%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	13.42%	11.64%	+1.78%

TIBIX vs. BRUFX - Expense Ratio Comparison

TIBIX has a 0.93% expense ratio, which is higher than BRUFX's 0.68% expense ratio.

Dividends

TIBIX vs. BRUFX - Dividend Comparison

TIBIX's dividend yield for the trailing twelve months is around 5.18%, less than BRUFX's 5.50% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BRUFX Bruce Fund	5.50%	6.35%	5.01%	6.46%	13.31%	9.25%	5.83%	2.03%	2.49%	4.11%	6.26%	4.63%
TIBIX Thornburg Investment Income Builder Fund Class I	5.18%	5.83%	5.67%	4.89%	5.89%	5.33%	4.31%	4.46%	4.77%	4.52%	4.14%	4.66%

Frequently Asked Questions

Can I hold both TIBIX and BRUFX in my portfolio?

TIBIX and BRUFX have a correlation of 0.52, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TIBIX or BRUFX?

BRUFX has higher volatility (3.06%) compared to TIBIX (2.58%). In terms of maximum drawdown, TIBIX dropped -48.88% vs BRUFX's -44.50%.

Which has better risk-adjusted returns?

TIBIX currently has the higher Sharpe Ratio (3.66 vs 2.50), 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.