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At Ellison's urging the plaintiffs went back to the drawing board and divided their class into "pre-explosion and post-explosion subclasses."
. . .
Ellison found the methodology used by the pre-explosion plaintiffs to calculate their damages lacking, however, and denied them class certification last week.
Source: Courthouse News
The post-explosion litigants were more persuasive in arguing that BP's understatements about the spill's size had caused an artificial delay in the stock price falling, according to the May 20 ruling.
Ellison certified the class as all people or entities who bought BP stock between April 26, 2010, and May 28, 2010, excluding BP executives, their families and affiliates.