Slightly more than $1 billion flowed back into mutual funds that invest in U.S. stocks long-term, in the week ended Aug. 17.

That followed an outflow of $23.5 billion the previous week, when investors and markets reacted to the first-ever downgrade of U.S. debt. In the previous four weeks, $48.5 billion flowed out of domestic long-term equity funds, according to the Investment Company Institute.

Overall, $772 million did flow out of mutual funds in the latest week of reporting.

That's because $3.12 billion exited bond funds, compared to estimated outflows of $4.35 billion during the previous week. Taxable bond funds saw estimated outflows of $2.74 billion, while municipal bond funds had estimated outflows of $387 million.

Equity funds had estimated inflows of $1.48 billion for the week, compared to estimated outflows of $30.01 billion in the previous week.

Hybrid funds, which can invest in stocks and fixed income securities, had estimated inflows of $874 million for the week, compared to estimated outflows of $5.90 billion in the previous week.

More than $40 billion flowed out of all forms of mutual funds, in the week that featured the first-ever downgrade of U.S. debt.