Schering-Plough Corporation (“SGP/SGP1C”)
Merger Complete with
Merck Co., Inc. (“MRK/MRK1C”)

Attached, for your information is an important memo from the Options Clearing Corporation.

We urge you to read this (see link) and distribute to others within your organization you deem
appropriate.

http://www.optionsclearing.com/market/infomemos/2009/nov/26564.pdf

Key Information:
SGP1C changes to SGP2C 11/04/09
SGP2C CME Clearing Code SQ9
SGP1C Standard (100 Shares) Will not be reintroduced
GTC Order Handling New OCC Methodology* No change to Price or Quantity

* Member firms must determine if the new GTC order terms meet their clients’ objectives and cancel
or cancel/replace orders as appropriate.