Can someone double-check my understanding of this? Double is a portfolio management service that purchases shares that match the blend of a specific index for

Can someone double-check my understanding of this? Double is a portfolio management service that purchases shares that match the blend of a specific index for its customers. So instead of owning an index, you own the shares. Double is winding down because they are not profitable. They are instructing their customers to either fully liquidate their holdings, or perform an ACATS transfer, which generally requires that any fractional holdings be liquidated first. However, the business model will necessarily require holding fractional shares because of the way indexes work. So my question is, this is going to cause many of their customers to get dinged by short-term capital gains tax, right? That stinks.