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Launched

State Street Prime Money Market ETF

MMKNYSESPDRC

$100.04+0.02 (+0.02%)

As of Nov 2, 2026, 2:25 PM ET

C60/ 100

Rank 39 of 78 in Cash & Ultra-Short Income

C60/100Rank 39 of 78inCash & Ultra-Short Income
Intraday session: up, 59 prints from 100.02 to 100.04. Range 100.03 to 100.04. Use the arrow keys to read each point.100.03100.03100.0310 AM12 PM2 PM4 PM
Expense ratio
0.18%
Fund size
$32M
1Y total return
No data
Yield · Last 12 months
No data
Holdings
74
Avg volume · 30D
2.07K sh
52W range
low $99.99high $100.35
Launched

The ETF.net MMK Grade

C

Score 60 out of 100

Category
Cash & Ultra-Short Income⁠
Rank
39 of 78
Six-pillar profile for MMK. Scores out of 100: Cost 53, Risk 49, Mission 100, Tradability 39, Holdings 45, Durability 44. Strongest: Mission (100). Weakest: Tradability (39). Leans toward Mission.

Score 60 of 100 falls in the B band. A is 70 or higher, B 55 to under 70, C 40 to under 55, D 25 to under 40, F under 25. The letter stays C for now. A new letter must hold for 3 published runs before it replaces it.

  • Cost

    The fund’s net expense ratio, ranked against its category.
    C53 out of 100
    Rank 33 of 78

  • Mission

    Whether the fund did what it promised, tested against its stated mandate.
    A100 out of 100
    Rank 1 of 67

  • Risk

    How the fund held up when markets fell: downside volatility, drawdowns and tail loss.
    C49 out of 100
    Rank 41 of 75

  • Tradability

    How easy the fund is to trade: daily volume, and how far its price strays from net asset value.
    D39 out of 100
    Rank 51 of 78

  • Holdings

    How concentrated the fund is, and how complete and current its disclosed holdings are.
    C45 out of 100
    Rank 55 of 77

  • Durability

    Whether the fund is likely to stay open, judged by its age, its assets and its issuer’s assets.
    C44 out of 100
    Rank 52 of 78

Our read on MMK

ETF.net Research

In short

CA money market fund that trades like a stock. MMK is built to qualify under Rule 2a-7, and it's the prime version, so State Street's cash desk underwrites short-term credit instead of sticking to government paper only.

Stated mandate

The Fund seeks to maximize current income while maintaining capital preservation and liquidity.

Why people hold it

  • Built to qualify as a money market fund under Rule 2a-7, the same rulebook as traditional money funds, but bought and sold intraday like any ETF.ssga.comstatestreet.com
  • Prime mandate, run by State Street's cash management team with a dedicated short-term credit research team behind the paper it buys.ssga.com
  • Costs 0.18% a year, a shade under the median for cash-alternative ETFs.
  • Measured against the ICE BofA SOFR Overnight Rate Index, so there's a plain overnight-cash yardstick to judge it by.ssga.com

Worth knowing

  • A 2026 launch that is still small and thinly traded, which can mean wider bid-ask spreads than long-running cash ETFs.
  • Prime paper carries bank and corporate credit risk that government-only money funds sidestep, and the fund is not FDIC insured.statestreet.com
  • Cheaper cash options exist: SBIL and IQMM charge 0.15% and ICSH 0.08%, though those run government or ultra-short bond mandates.

MMK Performance

Launched Feb 10, 2026

Shows how $10,000 changes over the selected period, with cash distributions reinvested at the closing price on each ex-dividend date.

Not enough history yet.Not enough history yet.Not enough history yet.Not enough history yet.Not enough history yet.
MMK$10,094
SPY tracks large US stocks. It provides market context, rather than representing this fund’s strategy, asset class or investment benchmark.$10,141
Jul 31, 2026 to Oct 30, 2026. MMK $10,094. SPY $10,141. Use the arrow keys to read each point.$10,000$10,200$10,400Jul 2026Sep 2026Oct 2026

Jul 31, 2026 – Oct 30, 2026

Returns run to the Oct 30, 2026 close, with cash distributions reinvested. Each period starts on the same date that many months or years earlier. Periods over one year show the average yearly return.

Trailing total return for MMK. Periods over one year show the average yearly return.
PeriodMMK
Year to dateFund launched this yearNo data
1 month+0.4%
3 months+0.9%
1 yearFund is under 1 year oldNo data
3 yearsFund is under 3 years oldper yearNo data
5 yearsFund is under 5 years oldper yearNo data
10 yearsFund is under 10 years oldper yearNo data

With distributions reinvested.

Calendar-year total return with cash distributions hypothetically reinvested at the ex-dividend date’s closing price. The current year shows year to date.

Annual total returns for MMK
YearReturn barMMK
2026 YTD+2.7%

History from Feb 12, 2026

MMK in the news

MMK Dividends

Last payment
$0.31 per share
Paid on
Shares bought on or after this date do not qualify for this distribution.
Frequency
Monthly

Distribution data unavailable.

Distribution history

2026

One bar per payment. 8 payments in 2026 YTD. Mar 2, 2026 $0.18; Apr 1, 2026 $0.31; May 1, 2026 $0.30; Jun 1, 2026 $0.31; Jul 1, 2026 $0.29; Aug 3, 2026 $0.31; Sep 1, 2026 $0.31; Oct 1, 2026 $0.31. Use the arrow keys to read each point.2026YTD
Ex-datePay dateAmount per share
Nov 2, 2026Pays Nov 5, 2026$0.32
Oct 1, 2026Oct 6, 2026$0.31
Sep 1, 2026Sep 4, 2026$0.31
Aug 3, 2026Aug 6, 2026$0.31
Jul 1, 2026Jul 7, 2026$0.29
Jun 1, 2026Jun 4, 2026$0.31
May 1, 2026May 6, 2026$0.30
Apr 1, 2026Apr 6, 2026$0.31
Mar 2, 2026Mar 5, 2026$0.18

MMK Risk

Risk pillarC49 out of 100Rank 41 of 75 in Cash & Ultra-Short Income
How much the fund’s monthly returns vary, scaled to a year.
Launched Feb 2026; fills in after 12 months
How it’s calculated: standard deviation

The sample standard deviation of monthly total returns, multiplied by the square root of 12.

Uses up to 36 complete months, with at least 12 required. Total returns include reinvested distributions.

Return above 3-month US Treasury bills per unit of volatility.
Launched Feb 2026; fills in after 12 months
How it’s calculated: Sharpe ratio

Subtract each month’s Treasury-bill return from the fund’s monthly total return.

Divide the average of those excess returns by their sample standard deviation, then multiply by the square root of 12.

Uses up to 36 complete months, with at least 12 required. Each month uses the Treasury yield quoted at the end of the previous month.

The largest fall from a peak to the low that followed.
Launched Feb 2026; fills in after 12 months
How it’s calculated: maximum drawdown

The largest percentage decline from an earlier peak, using total returns with reinvested distributions.

Uses up to five years through the last close, with at least 12 months required.

How strongly the fund’s returns move with its asset-class index.
−0.004
vs its asset-class index
How it’s calculated: beta

The beta figure is supplied by FMP. The comparison index depends on the fund’s broad asset class.

FMP measures it over up to five years of monthly returns.

MMK Cost

Compare MMK and XHLF

Overpaying vs XHLF, tied cheapest in Cash & Ultra-Short Income

$3,111

On $10,000 over 30 years. 7% growth a year before fees, expense ratio only.

  • MMK 0.18%

    $3,749

  • XHLF 0.03% Tied cheapest

    $638

$10,000
30 years

Cost over time

  • MMK 0.18%
  • XHLF 0.03%
  • Overpaying
One line per fund, from year 0 to year 30. Use the arrow keys to read each point.$0$1K$2K$3K$4K051015202530MMK $3,749XHLF $638

Year by year

YearMMKXHLFOverpaying
10$328$55$273
20$1,281$216$1,065
30$3,749$638$3,111

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