WASHINGTON - Investor enthusiasm waned in all categories of mutual funds in September, the Investment Company Institute's monthly survey found.

The mutual fund trade organization said net new cash flow to all categories of mutual funds was $17.26 billion in September, against $24 billion in August, and asset value fell 2.6%, to $7.28 trillion.

Despite positive net cash flow of $24 billion, assets in stock funds fell $182 billion. Hybrid funds had outflows of $2.12 billion, and their asset value fell $8.28 billion.

Taxable and municipal bond funds had combined outflows of $3 billion; their assets declined $3.91 billion.

Cash flow to aggressive growth funds fell to $5.91 billion, from $8.41 billion in August. Growth funds had cash flow of $9.16 billion, compared with $12.24 billion in August.

Growth and income funds' inflow was $62.6 million in September, versus an outflow of $2.84 billion in August. Stock funds that invest in overseas equities had an inflow of $1.52 billion in September, compared with an inflow of $3.70 billion in August.

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