SIFI vs. FLXR

Last updated Jun 24, 2026

SIFI (Harbor Scientific Alpha Income ETF) and FLXR (TCW Flexible Income ETF) are both Multisector Bonds funds. Both are actively managed. Over the past year, SIFI returned 6.31% vs 5.35% for FLXR. A 0.70 correlation means they provide meaningful diversification when combined. SIFI charges 0.50%/yr vs 0.40%/yr for FLXR.

Performance

SIFI vs. FLXR - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Harbor Scientific Alpha Income ETF (SIFI) and TCW Flexible Income ETF (FLXR). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with SIFI having a 1.26% return and FLXR slightly higher at 1.28%.

SIFI

• 1D: -0.00%
• 1M: 0.47%
• YTD: 1.26%
• 6M: 1.45%
• 1Y: 6.31%
• 3Y*: 7.51%
• 5Y*: —
• 10Y*: —

FLXR

• 1D: 0.13%
• 1M: 0.37%
• YTD: 1.28%
• 6M: 1.48%
• 1Y: 5.35%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

SIFI vs. FLXR - Yearly Performance Comparison

	2026 (YTD)	2025	2024
SIFI Harbor Scientific Alpha Income ETF	1.26%	8.83%	3.13%
FLXR TCW Flexible Income ETF	1.28%	8.37%	4.42%

Correlation

The correlation between SIFI and FLXR is 0.71, 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	0.71
Correlation (All Time) Calculated using the full available price history since Jun 24, 2024	0.70

The correlation between SIFI and FLXR has been stable across timeframes, ranging from 0.70 to 0.71 - a consistent structural relationship.

Return for Risk

SIFI vs. FLXR — Risk / Return Rank

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

SIFI

SIFI Risk / Return Rank: 62
SIFI Sharpe Ratio Rank: 63
SIFI Sortino Ratio Rank: 71
SIFI Omega Ratio Rank: 66
SIFI Calmar Ratio Rank: 51
SIFI Martin Ratio Rank: 58

FLXR

FLXR Risk / Return Rank: 79
FLXR Sharpe Ratio Rank: 77
FLXR Sortino Ratio Rank: 82
FLXR Omega Ratio Rank: 80
FLXR Calmar Ratio Rank: 75
FLXR Martin Ratio Rank: 82

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.

SIFI vs. FLXR - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Harbor Scientific Alpha Income ETF (SIFI) and TCW Flexible Income ETF (FLXR). 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.

	SIFI	FLXR	Difference
Sharpe ratio: Return per unit of total volatility	1.90	2.32	-0.42
Sortino ratio: Return per unit of downside risk	2.91	3.44	-0.53
Omega ratio: Gain probability vs. loss probability	1.36	1.45	-0.08
Calmar ratio: Return relative to maximum drawdown	2.33	3.67	-1.33
Martin ratio: Return relative to average drawdown	9.55	15.58	-6.04

SIFI vs. FLXR - Sharpe Ratio Comparison

The current SIFI Sharpe Ratio is 1.90, which is comparable to the FLXR Sharpe Ratio of 2.32. The chart below compares the historical Sharpe Ratios of SIFI and FLXR, 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

SIFI vs. FLXR - Drawdown Comparison

The maximum SIFI drawdown since its inception was -14.68%, which is greater than FLXR's maximum drawdown of -1.94%. Use the drawdown chart below to compare losses from any high point for SIFI and FLXR.

Drawdown Indicators

	SIFI	FLXR	Difference
Max Drawdown Largest peak-to-trough decline	-14.68%	-1.94%	-12.74%
Max Drawdown (1Y) Largest decline over 1 year	-2.71%	-1.46%	-1.25%
Max Drawdown (3Y) Largest decline over 3 years	-3.46%	—	—
Current Drawdown Current decline from peak	-0.27%	-0.29%	+0.02%
Average Drawdown Average peak-to-trough decline	-4.77%	-0.36%	-4.41%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.66%	0.34%	+0.32%

Volatility

SIFI vs. FLXR - Volatility Comparison

Harbor Scientific Alpha Income ETF (SIFI) and TCW Flexible Income ETF (FLXR) have volatilities of 0.79% and 0.81%, 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

	SIFI	FLXR	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.79%	0.81%	-0.02%
Volatility (6M) Calculated over the trailing 6-month period	2.48%	1.74%	+0.74%
Volatility (1Y) Calculated over the trailing 1-year period	3.34%	2.32%	+1.02%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.91%	2.81%	+2.10%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.91%	2.81%	+2.10%

SIFI vs. FLXR - Expense Ratio Comparison

SIFI has a 0.50% expense ratio, which is higher than FLXR's 0.40% expense ratio.

Dividends

SIFI vs. FLXR - Dividend Comparison

SIFI's dividend yield for the trailing twelve months is around 6.44%, more than FLXR's 5.81% yield.

Position	TTM	2025	2024	2023	2022	2021
FLXR TCW Flexible Income ETF	5.81%	5.66%	3.44%	0.00%	0.00%	0.00%
SIFI Harbor Scientific Alpha Income ETF	6.44%	6.57%	5.87%	5.71%	3.88%	0.86%

Frequently Asked Questions

Can I hold both SIFI and FLXR in my portfolio?

SIFI and FLXR have a correlation of 0.71, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SIFI or FLXR?

FLXR has higher volatility (0.81%) compared to SIFI (0.79%). In terms of maximum drawdown, SIFI dropped -14.68% vs FLXR's -1.94%.

Which ETF is better, SIFI or FLXR?

On 1-year performance, SIFI leads with 6.31% vs 5.35% for FLXR. On fees, FLXR is cheaper at 0.40% per year. Their volatility is very similar. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, SIFI or FLXR?

Over the 1-year period, SIFI has performed better with a 6.31% return vs 5.35%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, SIFI or FLXR?

FLXR is cheaper with a 0.40% expense ratio, compared with 0.50% for SIFI.

Which ETF pays a higher dividend yield, SIFI or FLXR?

SIFI has the higher dividend yield at 6.44%, compared with 5.81% for FLXR.

What is the main difference between SIFI and FLXR?

They also come from different issuers: Harbor and TCW. Their fees differ too: 0.50% for SIFI and 0.40% for FLXR.

Which has better risk-adjusted returns?

FLXR currently has the higher Sharpe Ratio (2.32 vs 1.90), 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.