negative reaction was due to the article’s negative tone and innuendo in the Enron market. See, e.g., Merrill Lynch, Flash-Note, Omnicom Group Inc.: Good News: No New Neios in WSJ Article, June 12, 2002; Richard Morgan, Hatchet Job, The-Deal.com, June 14, 2002; Bear Stearns, Omnicom Group (OMC-62.30) — Buy: Follow Up On WSJ Article, June 13, 2002; SalomonSmithBarney, Omnicom Group Inc. (OMC): Comments on Management Meeting, June 13, 2002; SalomonSmithBarney, Omnicom Group Inc. (OMC): Comments on WSJ Article, June 12, 2002; Richard Tomkins, Omnicom Slides on S & P’s Move to Cut Outlook, Fin. Times, June 13, 2002; UBS Warburg, Global Equity Research: Omnicom Group (OMC), June 13, 2002.
In the two days following the June 12 article, Omnicom’s stock dropped over twenty-five percent relative to trading prices and activity in the market and the industry. However, after Omnicom announced that its new auditor, KPMG, reviewed the accounting for the Seneca transaction and had not recommended any changes, Omnicom’s stock increased substantially relative to the industry and the market.
c) The Present Action
On June 13, 2002, as Omnicom’s closing price fell, appellant and other plaintiffs filed this action. On May 19, 2003, appellant filed an amended complaint, which appellees moved to dismiss. The district court granted appellees’ motion in part, dismissing claims involving Omnicom’s organic growth calculations and its earn-out and put-out liabilities, but denied the motion with regard to the Seneca transaction.
The complaint made three allegations of fraud concerning the Seneca transaction. First, it alleged that Omnicom should have written down the value of the internet companies before engaging in the Seneca transaction. Second, it alleged that the accounting of the Seneca transaction was fraudulent because Omnicom failed to appropriately value the internet companies. Third, it alleged that Omnicom should have accounted for Seneca’s losses after the Seneca transaction occurred because Omnicom controlled Seneca. Each allegation, therefore, focused on the loss in value of the internet companies and the failure to reflect that loss on Omnicom’s books.
The class action complaint invoked the rebutable presumption of shareholder reliance established in Basic, Inc. v. Levinson, 485 U.S. 224, 241-42, 108 S.Ct. 978, 99 L.Ed.2d 194 (1988). It alleged that Omnicom was an actively traded company and that the market for its shares promptly reflected public information about the company.
In July 2005, appellant moved to certify a class “consisting of all persons and entities who purchased or otherwise acquired the securities of Omnicom from February 20, 2001 through June 11, 2002 and who were damaged thereby.” Appellant’s Br. at 24. The district court certified the class on April 30, 2007.
After extensive discovery and in response to appellees’ motion for summary judgment, appellant proffered, inter alia, a report of its expert witness, Dr. Scott D. Hakala. Dr. Hakala prepared an event study analysis and was prepared to testify that “the investing public’s initial reactions to the partially corrective disclosures in June 2002 were tied to the news of Omnicom’s inappropriate accounting for investments in Internet-related entities and not to other news during that time period.” Joint App. at 1221. He claimed that “[i]nvestors legitimately feared that Omnicom’s transfers of its Internet investments created the potential for losses and hidden liabilities and/or had allowed Omnicom to