Investors put $636 million into equity mutual funds during the two business days ended April 16, estimates

TrimTabs.com

, a firm that tracks fund inflows and outflows.

For the most recent period, U.S. equity funds saw inflows of $1.58 billion. International funds, meanwhile, had outflows of $940 million, estimates TrimTabs.

For the two days ended April 16, the

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Nasdaq Composite Index

rose 0.6%, the

S&P 500

rose 1.2% and the

Dow

climbed 1.5%.