MMK ETF — State Street Prime Money Market ETF

State Street Prime Money Market ETF (MMK)

MMK is a low-cost ETF. As of August 19, 2026, its distribution rate is 3.68%, its trailing-12-month yield is 1.68%, its expense ratio is 0.18%. Dividend Vision Distribution Safety Score™ is 50/100 (Caution). Fund total return is 1.9% over the past 0.5 years, 11.3 points behind SPY at 13.2%.

At the current 3.68% distribution rate, a $10,000 investment would generate approximately $368 per year, or $30.67 per month on an equivalent basis.

State Street Prime Money Market ETF is a money market fund that invests more than 25% of its assets in bank obligations, with a substantial portion in securities issued under federal securities law exemptions. The fund offers a competitive current distribution rate with monthly distributions and carries an expense ratio of 0.18%. It appeals to investors seeking steady income and liquidity from short-term, high-quality fixed-income securities.

MMK performance versus SPY

Data as of August 19, 2026.

Fund total return is 1.9% over the past 0.5 years, 11.3 points behind SPY at 13.2%.

MMK key facts

Data as of August 19, 2026.

Distribution Safety Score™

50 · Caution

Issuer

State Street

Asset type

ETF

Asset class

Fixed Income

Inception date

02/11/2026

Expense ratio

0.18%

Distribution rate

3.68%

Distribution frequency

Monthly

Trailing yield

1.68%

Last close

$100.19

AUM

$29,052,579

Average volume

1668.0

Last dividend

$0.3070

Ex-dividend date

08/03/2026

Payment date

08/06/2026

Beta

-0.0017

How Dividend Vision calculates yield and returns

Distribution rate (3.68%) is the latest regular payout annualized by the fund's stated frequency, divided by the last close. Issuers often publish this as “Distribution Rate” on the fact sheet. Trailing-12-month yield (1.68%) is the sum of distributions paid in the last 12 months, split-adjusted, divided by the last close. It lags a recent raise or cut. We show a 30-day SEC yield when the fund publishes one. Schwab and other issuers may report a TTM distribution yield or SEC yield on a different date — all can be valid; they are not interchangeable. Fund total return uses split-adjusted close with distributions reinvested from the first stored bar on or after inception through the latest bar, compared with the same window on the benchmark. That is what the fund did, not your personal gain/loss. Figures below use Dividend Vision data as of August 19, 2026.

Distribution rate methodology · Distribution Safety Score methodology · SEC yield

Sources and review

Data as of August 19, 2026.

Primary sources: State Street; prices and distributions from Dividend Vision, derived from vendor EOD data.

Reviewed by Bert Sweet, CEO and Co-owner of Dividend Vision. Methodology: Distribution Safety Score.

MMK risks and drawbacks

MMK's current distribution rate is moderate, not a high-yield payout — the strategy is dividend quality more than maximum income. Total return has trailed SPY over the available window.

Who may consider MMK — and who may not

MMK may suit someone looking for low-cost broad dividend exposure, moderate current income with a quality tilt. It is a weaker fit for investors hunting double-digit covered-call yields; investors whose main goal is matching SPY total return. This is educational context, not a recommendation to buy or sell.

Frequently asked questions

More funds from State Street.