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Do dark pools have to declare the volume transacted at the end of the day?
Members of the Federal Reserve System keep track of what money a bank has (if it's not in the vault), who owns what shares of stock, who owns what bond, etc. The part of the Federal Reserve System that tracks stock ownership is the Depository Trust Company (DTC). They have a group of subsidiaries that settle various types of security transactions. DTC is a member of the U.S. Federal Reserve System, a limited-purpose   trust company under New York State banking law and a registered   clearing agency with the Securities and Exchange Commission. There's lots of information on their website describing this process. DTCC's subsidiary, The Depository Trust Company (DTC), established in   1973, was created to reduce costs and provide clearing and settlement   efficiencies by immobilizing securities and making "book-entry"   changes to ownership of the securities. DTC provides securities   movements for NSCC's net settlements1, and settlement for institutional   trades (which typically involve money and securities transfers between   custodian banks and broker/dealers), as well as money market   instruments. Black pools are trades done where the price is not shared with the market. But the DTC is the one who keeps track of who owns which shares. They have records of all net transactions2. The DTC is the counterparty for transactions. When stock moves from one entity to another the DTC is involved. As the central counterparty for the nation's major exchanges and   markets, DTCC clears and settles virtually all broker-to-broker equity 1. This is the link that shows that settlements are reported on a "net basis". 2. If broker A sells 1000 shares of something to broker B at 8 and then five minutes later broker B sells the 1000 shares back to A, you cannot be sure that that total volume will be recorded. No net trading took place and there would be fees to pay for no reason if they reported both trades. Note: In dark pool trading quite often the two parties don't know each other. For shares (book-keeping records) to be exchanged it has to be done through a Clearing House.