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Launched

State Street Prime Money Market ETF

MMKNYSEC

$100.14+0.01 (+0.01%)

As of Oct 13, 2026, 12:49 PM

C48/ 100

Rank 62 of 78 in Cash & Ultra-Short Income

C48/100Rank 62 of 78inCash & Ultra-Short Income
Intraday session: up, 7 prints from 100.13 to 100.14. Range 100.13 to 100.14. Use the arrow keys to read each point.100.13100.13100.14100.1410 AM12 PM2 PM4 PM
Expense ratio
0.18%
Fund size
$29M
1Y total return
—
Yield · Last 12 months
Data unavailable
Holdings
74
Avg volume · 30D
0M sh
NAV per share
$100.11
52W range
low $99.99high $100.34
Launched

The ETF.net MMK Grade

Based on 5 of 6 pillars

C

Score 48 out of 100

Category
Cash & Ultra-Short Income⁠
Rank
62 of 78
Six-pillar profile for MMK. Scores out of 100: Cost 56, Risk 49, Mission not scored, Tradability 38, Holdings 44, Durability 45. Strongest: Cost (56). Weakest: Tradability (38). Based on 5 of 6 pillars.

Score 48 of 100 falls in the C band. A is 70 or higher, B 55 to under 70, C 40 to under 55, D 25 to under 40, F under 25.

  • Cost

    The fund’s net expense ratio, ranked against its category.
    B56 out of 100
    Rank 31 of 78

  • Mission

    Whether the fund did what it promised, tested against its stated mandate.
    Not scored

  • Risk

    How the fund held up when markets fell: downside volatility, drawdowns and tail loss.
    C49 out of 100
    Rank 42 of 75

  • Tradability

    How easy the fund is to trade: daily volume, and how far its price strays from net asset value.
    D38 out of 100
    Rank 52 of 78

  • Holdings

    How concentrated the fund is, and how complete and current its disclosed holdings are.
    C44 out of 100
    Rank 56 of 77

  • Durability

    Whether the fund is likely to stay open, judged by its age, its assets and its issuer’s assets.
    C45 out of 100
    Rank 51 of 78

Our read on MMK

ETF.net Research

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

  1. 01Built 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.cominvestors.statestreet.com
  2. 02Prime mandate, run by State Street's cash management team with a dedicated short-term credit research team behind the paper it buys.ssga.com
  3. 03Costs 0.18% a year, a shade under the median for cash-alternative ETFs.
  4. 04Measured against the ICE BofA SOFR Overnight Rate Index, so there's a plain overnight-cash yardstick to judge it by.ssga.com

Worth knowing

  1. 01A 2026 launch that is still small and thinly traded, which can mean wider bid-ask spreads than long-running cash ETFs.
  2. 02Prime paper carries bank and corporate credit risk that government-only money funds sidestep, and the fund is not FDIC insured.investors.statestreet.com
  3. 03Cheaper cash options exist: SBIL and IQMM charge 0.15% and ICSH 0.08%, though those run government or ultra-short bond mandates.

MMK Holdings

As of Oct 12, 2026
Asset class
Other
Holdings
74
Top-10 weight
38%
Largest holding
Goldman Sacs Tri Party D Repo8.4%

Geography

  • United States100.00%
The fund’s holdings, weight-ordered — page 1 of 5.
#TickerCompanyWeight %SharesMarket valueIn ETFs
001—Goldman Sacs Tri Party D Repo8.38%2,427,000$2M1
002—Mizuho Securities Usa Tri A Repo6.90%2,000,000$2M1
003—Rbc Dominion Securities Tri Pa Tri Party Repo D6.90%2,000,000$2M1
004—Td Securities Usa Tri Party Tri B Repo3.45%1,000,000$1M1
005—Ryl Bnk of Scot Tri A Repo3.45%1,000,000$1M1
006—Verto Cap I Compartment 10/26 Zcp2.07%600,000$600K1
007—Anglesea Fdg PLC & Ang1.72%500,000$500K1
008—Barclays Bank Uk1.72%500,000$500K1
009—Mackinac Funding1.53%450,000$443K1
010—Verto Cap I 144A Disc Coml Pap 11/26 Zcp1.38%400,000$398K1
011—Bpce1.28%375,000$370K1
012—Bank Montreal Chicago Brh1.21%350,000$350K2
013—Nordea Bank Abp1.21%350,000$350K1
014—Hsbc Bank PLC1.21%350,000$350K1
015—Royal Bank of Canada1.21%350,000$350K1

Showing 1–15 of 74 holdings

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.$10,332
Jul 10, 2026 to Oct 12, 2026. MMK $10,094. SPY $10,332. Use the arrow keys to read each point.$9,608$10,004$10,400Jul 2026Aug 2026Oct 2026

Jul 10, 2026 – Oct 12, 2026

Returns run to the Oct 12, 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 year—
1 month+0.3%
3 months+0.9%
1 yearFund is under 1 year old—
3 yearsFund is under 3 years oldper year—
5 yearsFund is under 5 years oldper year—
10 yearsFund is under 10 years oldper year—

As of the close, 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+2.4%

History from Feb 12, 2026

MMK in the news

Filtered to MMK · Cash & Ultra-Short Income

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
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

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.

MMK Cost

Expense ratio0.18%
  • The middle half of Cash & Ultra-Short Income funds
  • Median 0.19%

33 of the 78 Cash & Ultra-Short Income funds charge less.

MMK costs $18.00 a year on $10,000. The median Cash & Ultra-Short Income fund costs $19.00.

Other funds in Cash & Ultra-Short Income

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