Inflows, or net amount of buying, were $15.57 billion in the week ended Aug. 12, bringing the total inflows for the past 22 weeks to about $230.89 billion.
Stock funds had inflows of $2.79 billion, against inflows of $5.43 billion the prior week. Weekly outflows from stock funds topped $10 billion earlier this year before the market started to rebound in March.
U.S. stock funds had inflows of $318 million as foreign funds had inflows of $2.48 billion.
At the same time, bond funds had inflows of $11.84 billion, up from $11.74 billion the prior week. Taxable funds added $9.86 billion, while municipal ones took in $1.98 billion.
Investors put $945 million into hybrid funds, compared with $1.03 billion the previous week, the institute said. Such funds can invest in both stocks and fixed-income assets.
Separately, assets in money-market funds fell $22.63 billion in the latest week amid steep withdrawals by institutional investors, the sixth consecutive week of outflows, according to iMoneyNet's Money Fund Report. Cash has been returning to stocks after the 17-month selloff.
The seven-day yield on taxable money-market funds held steady at its record low of 0.07%. The yield has been steadily declining in the wake of a decision by the U.S. Federal Reserve to keep the target federal-funds rate under 0.25%, which was recently affirmed.
For the week ended Tuesday, total assets in money-market funds dropped to $3.524 trillion.
Overall, taxable-fund assets declined by $19.81 billion to $3.078 trillion as institutional investors took out $16.49 billion and individual investors withdrew $3.32 billion. Government funds had $17.31 billion of outflows, according to iMoneyNet.
Tax-free funds posted outflows of $2.82 billion, as yields fell to 0.10% from 0.11% for seven-day funds but held steady at 0.12% for 30-day funds.