Ben McCulloch, managing director and general counsel at XA Investments, says that the last five years have seen over $40 billion in growth in interval funds and tender-offer funds, and that interest has attracted more fund sponsors -- including companies that have been heretofore more focused on ETFs -- and more new ideas. That has brought with it increased regulatory scrutiny, as the Securities and Exchange Commission is evaluating what kinds of alternatives -- particularly with private-equity and venture-capital investments -- are right for the interval fund structure, but McCulloch sees the growth and the expansion of interval offerings continuing, with more new and different funds on the horizon.