GMMFvsZROZETF Comparison

ETF 1

GMMF

iShares Government Money Market ETF

This fund is part of

Money Market Bonds

+0.03%

Full GMMF fund page

ETF 2

ZROZ

PIMCO 25+ Year Zero Coupon U.S. Treasury Index ETF

This fund is part of

US Government Bonds

+0.07%

Full ZROZ fund page

iShares Government Money Market ETF (GMMF) belongs to the Money Market Bonds segment. PIMCO 25+ Year Zero Coupon U.S. Treasury Index ETF (ZROZ) is part of the US Government Bonds segment. GMMF's top 2 sector exposures are Sovereign and Government Agencies. In contrast, ZROZ's top sector exposures are Sovereign. GMMF is more expensive with a Total Expense Ratio (TER) of 0.2%, versus 0.15% for ZROZ. GMMF is up 2.8% year-to-date (YTD) with +$102M in YTD flows. ZROZ performs worse with -9.49% YTD performance, and +$587M in YTD flows. Run a side-by-side ETF comparison of GMMF and ZROZ below, and assess how they stack up in performance, liquidity, risk, exposure, holdings, and more, helping you select the best ETF for your investments.

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GMMF vs ZROZ performance and flow charts

Performance

Cumulative Flows

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Data Services

Historic performance and flows

Data as of 10/16/2026

		1M	3M	YTD	1Y	3Y	5Y
Perf.	GMMF ZROZ	+0.32%-2.19%	+0.91%-6.62%	+2.80%-9.49%	+3.62%-15.83%	n/a-7.17%	n/a-54.31%
Flows	GMMF ZROZ	+$3M+$340M	+$14M+$708M	+$102M+$587M	+$109M+$499M	-+$1.36B	-+$2.36B

Volatility and drawdown

		3M	1Y	3Y	5Y
Volatility	GMMF ZROZ	+0.10%+18.45%	+0.10%+15.72%	n/a+20.95%	n/a+23.77%
Max drawdown	GMMF ZROZ	n/a-13.65%	n/a-22.82%	n/a-33.12%	n/a-61.27%
Max drawdown duration	GMMF ZROZ	n/a89d	n/a359d	n/a760d	n/a1776d

Trading data

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	GMMF	ZROZ
Last sale 10/19/2026 at 1:30 PM		$55.99
Previous close 10/16/2026		$56.63
Consolidated volume 10/16/2026
Average volume 30 days
Average discount or premium 30 days
Average Bid/Ask spread 30 days

Replication quality

Data as of October 20, 2026

1-year trailing difference

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GMMF

is actively managed and doesn’t replicate an index

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	GMMF	ZROZ
Tracking error
Tracking difference
1 year cumulative return difference
Best
Worst
Daily return difference
Average
Worst

Main metrics

Last update 10/19/2026 at 1:30 PM

Live

Closed

	GMMF	ZROZ
Last price	–	$55.99
1D performance	–	-1.13%
AuM	$193.54 M	$1.98 B
E/R	0.2%	0.15%

Characteristics

	GMMF	ZROZ
Management strategy	Active	Passive
Provider	iShares	PIMCO
Benchmark	-	ICE BofA Long US Treasury Principal STRIPS Index
N° of holdings	127	21
Asset class	-	Bonds
Trailing 12m distribution yield	Join	Join
Inception date	February 4, 2025	October 30, 2009
ESG	No	No

More GMMF data on Trackinsight

More ZROZ data on Trackinsight

Exposure

Countries

GMMF

USA

92.27%

Other

7.73%

ZROZ

USA

95.56%

Other

4.44%

Sectors

GMMF

Sovereign

76.23%

Government Agenci.

16.05%

Other

7.73%

ZROZ

Sovereign

95.56%

Other

4.44%

Diversification

GMMF

Total weight of top 15 holdings out of 15

64.88%

ZROZ

Total weight of top 15 holdings out of 15

78.28%

Top 15 holdings

Data as of August 31, 2026

GMMF

USA, Bills 0% 22sep2026, USD (119D)

10.05%

USA, Bills 0% 1sep2026, USD (119D)

8.50%

USA, Bills 0% 1oct2026, USD (364D)

8.46%

USA, Bills 0% 24sep2026, USD (182D)

8.09%

USA, Bills 0% 6oct2026, USD (119D)

7.73%

USA, Bills 0% 15sep2026, USD (119D)

5.61%

USA, Bills 0% 29sep2026, USD (119D)

4.19%

USA, Bills 0% 8sep2026, USD (119D)

2.10%

USA, Bills 0% 28jan2027, USD (182D)

1.91%

USA, Notes FRN 30apr2028, USD (BB-2028)

1.84%

USA, Bills 0% 3sep2026, USD (364D)

1.70%

USA, Bills 0% 17nov2026, USD (119D)

1.35%

US912797WF00

1.25%

Federal Farm Credit Banks, FRN 20oct2026, USD

1.05%

US3133EWYH78

1.05%

ZROZ

USA, STRIPS 0% 15feb2052, USD (10957D)

5.67%

USA, STRIPS 0% 15may2052, USD (10958D)

5.52%

USA, STRIPS 0% 15nov2051, USD (10957D)

5.42%

USA, STRIPS 0% 15aug2052, USD (10958D)

5.37%

USA, STRIPS 0% 15feb2053, USD (10958D)

5.35%

USA, STRIPS 0% 15nov2052, USD (10958D)

5.32%

USA, STRIPS 0% 15nov2053, USD (10958D)

5.32%

USA, STRIPS 0% 15aug2051, USD (10956D)

5.25%

USA, STRIPS 0% 15aug2053, USD (10958D)

5.23%

USA, STRIPS 0% 15may2053, USD (10958D)

5.23%

USA, STRIPS 0% 15feb2055, USD (10954D)

5.09%

USA, STRIPS 0% 15feb2056, USD (10955D)

4.99%

USA, STRIPS 0% 15nov2054, USD (10957D)

4.94%

USA, STRIPS 0% 15may2054, USD (10957D)

4.85%

USA, STRIPS 0% 15aug2055, USD (10957D)

4.73%

Frequently asked questions about GMMF and ZROZ

How have the GMMF and ZROZ ETFs performed in 2026?

As of October 16, 2026, GMMF is up 2.8% year-to-date (YTD), while ZROZ has lost -9.49%. That puts GMMF better performer ahead so far this year.

Which ETF is attracting more investor money: GMMF or ZROZ?

Year-to-date, the GMMF ETF saw +$102M in flows, compared to +$587M for ZROZ.

Which ETF is more volatile: GMMF or ZROZ?

Over the past year, GMMF had a volatility of 0.1%, while ZROZ experienced 15.72%.

Which ETF is bigger: GMMF or ZROZ?

As of October 16, 2026, GMMF holds $193.54 M in assets under management (AUM), while ZROZ manages $1.98 B.

What sectors do the GMMF and ZROZ ETFs invest in?

GMMF leans toward sectors like Sovereign and Government Agencies. Meanwhile, ZROZ focuses on Sovereign.

What are the top holdings of the GMMF ETF and ZROZ ETF?

GMMF top holdings include USA, Bills 0% 22sep2026, USD (119D), USA, Bills 0% 1sep2026, USD (119D) and USA, Bills 0% 1oct2026, USD (364D). ZROZ holds in its top three: USA, STRIPS 0% 15feb2052, USD (10957D), USA, STRIPS 0% 15may2052, USD (10958D) and USA, STRIPS 0% 15nov2051, USD (10957D).

GMMFvsZROZETF Comparison

iShares Government Money Market ETF

PIMCO 25+ Year Zero Coupon U.S. Treasury Index ETF

GMMF vs ZROZ performance and flow charts

Performance

Cumulative Flows

Get all the metrics on this page, and more, through a reliable ETF data feed

Countries

Sectors

Diversification

Top 15 holdings

How have the GMMF and ZROZ ETFs performed in 2026?

As of October 16, 2026, GMMF is up 2.8% year-to-date (YTD), while ZROZ has lost -9.49%. That puts GMMF better performer ahead so far this year.

Which ETF is attracting more investor money: GMMF or ZROZ?

Year-to-date, the GMMF ETF saw +$102M in flows, compared to +$587M for ZROZ.

Which ETF is more volatile: GMMF or ZROZ?

Over the past year, GMMF had a volatility of 0.1%, while ZROZ experienced 15.72%.

Which ETF is bigger: GMMF or ZROZ?

As of October 16, 2026, GMMF holds $193.54 M in assets under management (AUM), while ZROZ manages $1.98 B.

What sectors do the GMMF and ZROZ ETFs invest in?

GMMF leans toward sectors like Sovereign and Government Agencies. Meanwhile, ZROZ focuses on Sovereign.

What are the top holdings of the GMMF ETF and ZROZ ETF?

GMMF top holdings include USA, Bills 0% 22sep2026, USD (119D), USA, Bills 0% 1sep2026, USD (119D) and USA, Bills 0% 1oct2026, USD (364D). ZROZ holds in its top three: USA, STRIPS 0% 15feb2052, USD (10957D), USA, STRIPS 0% 15may2052, USD (10958D) and USA, STRIPS 0% 15nov2051, USD (10957D).

Which ETF is more diversified: GMMF or ZROZ?

GMMF holds 153 securities with 64.88% of its assets in the top 15. ZROZ has 21 securities and a top 15 weight of 78.28%.

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