Amendments to the Operational Trading Procedures for Options Trading Exchange Participants to (i) facilitate the implementation of various platform infrastructure initiatives that are being undertaken by Hong Kong Exchanges and Clearing Limited, including the construction of its Next Generation Data Centre and upgrade of its securities and derivatives network, SDNet 2.0; (ii) ensure consistency in the contingency procedures for trading in the stock options market operated by SEHK with those for trading in the derivatives market operated by Hong Kong Futures Exchange Limited; and (iii) clarify SEHK’s power to delete invalid block trades (effective from 26 March 2012)