Dark Pool Liquidity

Written By
Paul Tracy
Updated November 4, 2020

What is Dark Pool Liquidity?

Dark pool liquidity refers to the amount of trading activity that occurs directly between parties without the use of an exchange, thereby keeping the transaction private.

How Does Dark Pool Liquidity Work?

Dark pool liquidity usually is created by institutions. For example, let's assume that Company XYZ and Company ABC are pension funds in California and Oregon, respectively. Company XYZ wants to sell 2 million shares of McDonald's (MCD) to Company ABC. However, the trade is so large that investors might regard the transaction as a sell signal on MCD, which could tank the stock and make further sales more difficult for the seller. Thus, the two companies decide to do the trade off the exchange (i.e., in a "dark pool"). The transaction costs might also be lower.

Accordingly, they make the trade on the over-the-counter market, directly between themselves, or even on a regional exchange. Securities and Exchange Commission Rule 19c3 allows stocks listed on any equity exchange after April 26, 1979, to trade off board -- that is, off an exchange.

Why Does Dark Pool Liquidity Matter?

Dark pool liquidity provides anonymity. It also provides a way to avoid destabilizing the markets if a trade is particularly large, and it can increase liquidity in the markets by increasing the ease with which buyers can buy and sellers can sell. However, dark pools are controversial because they prevent all investors and market participants from knowing the true prices at which specific securities are valued in all arm's-length transactions. Given that dark pool trading reportedly constitutes 20% of all market volume, according to some sources, the controversy is bound to continue or increase with its popularity.

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