Private Firms Use Closed-End Funds To Tap the Market
Apollo Advisers, Blackstone Group, Kohlberg Kravis Roberts and other private equity firms are reaching out to small investors through closed-end mutual funds; Apollo has raised $930 million to start a fund that will lend money to companies with revenue of $50 million to $500 million; vehicle is being promoted to investors looking for high yield in current low-rate environment, and it carries high fees; closed-end format allows private equity firms to raise money quickly and gives them permanent capital; photo (M)