TDTF vs. SPY

Last updated Apr 2, 2026

Compare and contrast key facts about FlexShares iBoxx 5-Year Target Duration TIPS Index Fund (TDTF) and State Street SPDR S&P 500 ETF (SPY).

TDTF and SPY are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. TDTF is a passively managed fund by Northern Trust that tracks the performance of the iBoxx 5-Year Target Duration TIPS. It was launched on Sep 19, 2011. SPY is a passively managed fund by State Street that tracks the performance of the S&P 500 Index. It was launched on Jan 22, 1993. Both TDTF and SPY are passive ETFs, meaning that they are not actively managed but aim to replicate the performance of the underlying index as closely as possible.

Performance

TDTF vs. SPY - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in FlexShares iBoxx 5-Year Target Duration TIPS Index Fund (TDTF) and State Street SPDR S&P 500 ETF (SPY). The values are adjusted to include any dividend payments, if applicable.

TDTF vs. SPY - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TDTF FlexShares iBoxx 5-Year Target Duration TIPS Index Fund	0.50%	7.83%	2.40%	4.10%	-9.73%	5.54%	9.98%	7.99%	-0.82%	1.93%
SPY State Street SPDR S&P 500 ETF	-3.65%	17.72%	24.89%	26.18%	-18.18%	28.73%	18.33%	31.22%	-4.57%	21.71%

Returns By Period

In the year-to-date period, TDTF achieves a 0.50% return, which is significantly higher than SPY's -3.65% return. Over the past 10 years, TDTF has underperformed SPY with an annualized return of 2.87%, while SPY has yielded a comparatively higher 14.06% annualized return.

TDTF

• 1D: -0.10%
• 1M: -0.84%
• YTD: 0.50%
• 6M: 0.44%
• 1Y: 3.86%
• 3Y*: 3.67%
• 5Y*: 1.99%
• 10Y*: 2.87%

SPY

• 1D: 0.75%
• 1M: -4.28%
• YTD: -3.65%
• 6M: -1.42%
• 1Y: 18.14%
• 3Y*: 18.48%
• 5Y*: 11.86%
• 10Y*: 14.06%

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

TDTF vs. SPY - Expense Ratio Comparison

TDTF has a 0.18% expense ratio, which is higher than SPY's 0.09% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

TDTF

FlexShares iBoxx 5-Year Target Duration TIPS Index Fund

SPY

State Street SPDR S&P 500 ETF

Return for Risk

TDTF vs. SPY — Risk / Return Rank

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

TDTF

TDTF Risk / Return Rank: 52
TDTF Sharpe Ratio Rank: 54
TDTF Sortino Ratio Rank: 52
TDTF Omega Ratio Rank: 46
TDTF Calmar Ratio Rank: 54
TDTF Martin Ratio Rank: 53

SPY

SPY Risk / Return Rank: 59
SPY Sharpe Ratio Rank: 51
SPY Sortino Ratio Rank: 56
SPY Omega Ratio Rank: 60
SPY Calmar Ratio Rank: 58
SPY Martin Ratio Rank: 69

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.

TDTF vs. SPY - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for FlexShares iBoxx 5-Year Target Duration TIPS Index Fund (TDTF) and State Street SPDR S&P 500 ETF (SPY). 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.

	TDTF	SPY	Difference
Sharpe ratio Return per unit of total volatility	1.02	0.96	+0.06
Sortino ratio Return per unit of downside risk	1.45	1.49	-0.04
Omega ratio Gain probability vs. loss probability	1.19	1.23	-0.04
Calmar ratio Return relative to maximum drawdown	1.46	1.53	-0.07
Martin ratio Return relative to average drawdown	5.43	7.27	-1.84
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TDTF vs. SPY - Sharpe Ratio Comparison

The current TDTF Sharpe Ratio is 1.02, which is comparable to the SPY Sharpe Ratio of 0.96. The chart below compares the historical Sharpe Ratios of TDTF and SPY, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	TDTF	SPY	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.02	0.96	+0.06
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.35	0.70	-0.35
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.57	0.79	-0.22
Sharpe Ratio (All Time) Calculated using the full available price history	0.46	0.56	-0.10

Correlation

The correlation between TDTF and SPY is -0.01. This indicates that the assets' prices tend to move in opposite directions. Negative correlation can be particularly beneficial for diversification and risk management, as one asset may offset the losses of the other during market fluctuations.

Dividends

TDTF vs. SPY - Dividend Comparison

TDTF's dividend yield for the trailing twelve months is around 3.82%, more than SPY's 1.13% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
TDTF FlexShares iBoxx 5-Year Target Duration TIPS Index Fund	3.82%	4.58%	3.98%	3.97%	7.60%	4.55%	1.13%	1.80%	2.60%	2.20%	1.51%	0.21%
SPY State Street SPDR S&P 500 ETF	1.13%	1.07%	1.21%	1.40%	1.65%	1.20%	1.52%	1.75%	2.04%	1.80%	2.03%	2.06%

Drawdowns

TDTF vs. SPY - Drawdown Comparison

The maximum TDTF drawdown since its inception was -12.02%, smaller than the maximum SPY drawdown of -55.19%. Use the drawdown chart below to compare losses from any high point for TDTF and SPY.

Drawdown Indicators

	TDTF	SPY	Difference
Max Drawdown Largest peak-to-trough decline	-12.02%	-55.19%	+43.17%
Max Drawdown (1Y) Largest decline over 1 year	-2.56%	-12.05%	+9.49%
Max Drawdown (5Y) Largest decline over 5 years	-12.02%	-24.50%	+12.48%
Max Drawdown (10Y) Largest decline over 10 years	-12.02%	-33.72%	+21.70%
Current Drawdown Current decline from peak	-1.03%	-5.53%	+4.50%
Average Drawdown Average peak-to-trough decline	-2.94%	-9.09%	+6.15%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.69%	2.54%	-1.85%

Volatility

TDTF vs. SPY - Volatility Comparison

The current volatility for FlexShares iBoxx 5-Year Target Duration TIPS Index Fund (TDTF) is 1.15%, while State Street SPDR S&P 500 ETF (SPY) has a volatility of 5.35%. This indicates that TDTF experiences smaller price fluctuations and is considered to be less risky than SPY based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TDTF	SPY	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.15%	5.35%	-4.20%
Volatility (6M) Calculated over the trailing 6-month period	2.11%	9.50%	-7.39%
Volatility (1Y) Calculated over the trailing 1-year period	3.81%	19.06%	-15.25%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.70%	17.06%	-11.36%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.08%	17.92%	-12.84%