ETFs are securities certificates that state legal right of ownership over part of a basket of individual stock certificates. Several different kinds of financial firms are needed for ETFs to come into being, trade at prices that closely match their underlying assets, and unwind when investors no longer want them. Laying all the groundwork is the fund manager. This is the main backer behind any ETF, and they must submit a detailed plan for how the ETF will operate to be given permission by the SEC to proceed.

In theory all that a fund manager needs to do is establish clear procedures and describe precisely the composition of the ETF (which changes infrequently) to the other firms involved in ETF creation and redemption. In practice, however, only the very biggest institutional money management firms with experience in indexing tend …