Notice of Filing and Immediate Effectiveness of Proposed Rule Change Amending Rule 128-Equities, Which Governs Clearly Erroneous Executions, Extending the Effective Date of the Pilot Until September 30, 2013 and Adopting New Paragraph (i) to Rule 128-Equities in Connection With the Upcoming Operation of the Plan To Address Extraordinary Market Volatility Pursuant to Rule 608 of Regulation NMS Under the Act