Internal Crossing and Transfer Pricing

If one desk inside a multi-strategy firm wants to sell a stock at the same time another desk wants to buy it, sending both orders to the open market means paying the bid-ask spread and moving the price against yourself twice, once on each side. Internal crossing avoids this by matching the two orders directly inside the firm, so neither side touches the exchange, no spread is paid, and no market impact is created. The catch is transfer pricing: what price should the internal trade happen at? Too favorable to the buyer and the seller's desk is effectively subsidizing another book; too favorable to the seller and the reverse happens. The standard fix is to use an independently observable reference price at the moment of the cross — the prevailing mid-quote, or a volume-weighted average over a short window — so neither desk gains or loses relative to what it could have achieved in the open market, and to log the cross with a timestamped price check so it can be audited later.

Firms also need policies on which crosses are allowed at all, since crossing client orders against a firm's own book, or crossing between funds with different investors, raises conflict-of-interest concerns that a fair reference price alone does not fully resolve. Regulators generally require these policies to be documented and applied consistently, with records showing the reference price used and confirming that neither side was disadvantaged relative to what it could have achieved by trading in the open market instead.