The Chicago Board Options Exchange (CBOE) proposed to modify its Rule 6.53 to allow for the submission of attributable orders (i.e., orders that allow users to voluntarily display firm IDs), in connection with certain CBOE order processes. The rule change was proposed in response to requests by those routing orders to the CBOE users who believe that voluntary attribution will lead to enhanced execution opportunities. The CBOE noted that the Nasdaq Options Market currently allows its participants to submit attributable orders.

http://www.sec.gov/rules/sro/cboe/2008/34-58394.pdf