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MMK

GradeCNew York Stock Exchange

State Street Prime Money Market ETF

Treasury & Government Bond · SPDR · Inception 2026-02-10

$100.23+0.00 (+0.00%)

As of Sep 23, 2026, 10:22 AM EDT

History starts Feb 12, 2026.History starts Feb 12, 2026.
Intraday session: up, 3 prints from 100.23 to 100.23. Range 100.23 to 100.23. Use the arrow keys to read each point.$100.23$100.23$100.23$100.2310 AM12 PM2 PM4 PM
Expense ratio
0.18%
Fund size
$29M
1Y return
—
Yield · Last 12 months
Data unavailable
Holdings
45
Volume · 30D
0M sh
NAV per share
$100.21
52W range
low $99.99high $100.34

The ETF.net MMK Grade

C

47/ 100

Rank 63 of 78 in Cash & Ultra-Short Income⁠

Confidence Medium

Six-pillar profile for MMK. Scores out of 100: Cost 56, Risk 44, Mission not scored, Tradability 36, Holdings 48, Durability 45. Strongest: Cost (56). Weakest: Tradability (36). Based on 5 of 6 pillars.
F< 25
D≥ 25
C≥ 40
B≥ 55
A≥ 70

Score 47 of 100 sits in the C band. Bands: A ≥ 70, B ≥ 55, C ≥ 40, D ≥ 25, F < 25; the scale skips E.

  • Cost

    What you pay to own it — the expense ratio plus trading frictions, ranked within its category.
    BScore 56
    Category rank36/78 · top 46%

  • Mission

    How faithfully it does the job it claims — tracking its mandate or index with minimal slippage.
    Not scored
    —

  • Risk

    How violently it can move — volatility, drawdown depth, and downside capture versus its category.
    CScore 44
    Category rank57/75 · bottom quartile

  • Tradability

    How cheaply and easily you can get in and out — liquidity, spread, and premium/discount stability.
    DScore 36
    Category rank49/78 · mid-pack

  • Holdings

    What it actually owns — the quality, breadth, and concentration of the underlying portfolio.
    CScore 48
    Category rank50/77 · mid-pack

  • Durability

    Whether it will still be here — the fund’s assets, age, flows, and issuer staying power.
    CScore 45
    Category rank52/78 · mid-pack

Graded as of Sep 22, 2026 · Based on 5 of 6 pillars

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 Sep 21, 2026, 3:47 PM
Asset class
Other
Holdings
45
Top-10 weight
44%
Largest holding
US DOLLAR30.4%

Geography

  • United States100.00%
The fund’s holdings, weight-ordered — page 1 of 5.
#TickerCompanyWeight %SharesMarket valueIn ETFs
001—US DOLLAR30.38%9,022,660$9M223
002—VERTO CAP I COMPARTMENT 09/26 ZCP2.02%600,000$600K1
003—TREASURY BILL1.68%500,000$500K21
004—ANGLESEA FDG PLC + ANG1.68%500,000$500K1
005—BARCLAYS BANK UK1.68%500,000$500K1
006—MACKINAC FUNDING1.49%450,000$442K1
007—VERTO CAP I 144A DISC COML PAP 11/26 ZCP1.34%400,000$397K1
008—BPCE1.24%375,000$369K1
009—BANK MONTREAL CHICAGO BRH1.18%350,000$350K2
010—NORDEA BANK ABP1.18%350,000$350K1
011—HSBC BANK PLC1.18%350,000$350K1
012—OVERSEA CHINESE BK CO NY 10/26 VAR1.18%350,000$350K1
013—ROYAL BANK OF CANADA1.18%350,000$350K1
014—MUFG BK LTD1.18%350,000$350K1
015—SWEDBANK AB PUBL IAM COML PAPE 02/27 VAR1.18%350,000$350K1

Showing 1–15 of 69 holdings

MMK Performance

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

MMK$10,094
SPY tracks large US stocks. It provides market context, rather than representing this fund’s strategy, asset class or investment benchmark.$10,415
Jun 22, 2026 to Sep 22, 2026. MMK $10,094. SPY $10,415. Use the arrow keys to read each point.$9,741$10,122$10,502Jun 2026Aug 2026Sep 2026

Jun 22, 2026 – Sep 22, 2026

Returns run to the Sep 22, 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 old—per year
5 yearsFund is under 5 years old—per year
10 yearsFund is under 10 years old—per 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+2.2%

History from Feb 12, 2026

MMK in the news

MMK Dividends

Adds up every distribution paid per share over the last 12 months, divided by the last completed close. Distributions are counted by ex-date. Data through Sep 22, 2026.
Data unavailableLast 12 months
Payout per share
Data unavailableLast 12 months
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. 7 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. Use the arrow keys to read each point.2026YTD
Ex-datePay dateAmount per share
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 77 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.