Opinion for the Court filed by Circuit Judge SENTELLE.
UCB Chemicals Corporation appeals from a February 22, 2002 order of the district court granting Hill’s Pet Nutrition Inc.’s (“Hill’s Pet”) Motion to Modify the Final Order Approving Class Settlement and Final Judgment entered by the district court on November 30, 2001. We affirm the order because the district judge did not abuse his discretion when he found that Hill’s Pet’s neglect in failing to timely opt out of the settlement was excusable. Background
The class settlement at issue in this case is one of the many federal antitrust actions alleging price-fixing by suppliers of vitamins. The claims against UCB and other providers of choline chloride were consolidated before a single judge of the United States District Court for the District of Columbia under the title In re Vitamins Antitrust Litigation for pretrial proceedings. On July 25, 2001, the district court entered an order certifying the UCB Settlement Class and preliminarily approving the proposed settlement, in which UCB agreed to pay $9 million for a complete release of claims against it. The order contained a plan for notifying class members of the settlement. The plan provided for mailing notices to class members as well as publishing notices in widely read industry periodicals and the Wall Street Journal. The notices expressly stated that members would be bound by the settlement and could opt out by sending a *1209 written request postmarked before or on September 28, 2001. The Claims Administrator mailed a notice to Hill’s Pet’s corporate parent, at the same address to which prior notices, which had elicited responses, had been sent. The notice was also posted online. On November 30, 2001, the district judge entered a final judgment approving the settlement. When Hill’s Pet’s counsel reviewed an exhibit attached to the final order, on December 10, 2001, he discovered that Hill’s Pet was not listed among the class members who had timely opted out. Two days later, he filed a Motion to Modify the Final Order Approving the Class Settlement and Final Judgment to allow Hill’s Pet to opt out of the settlement. The court granted this motion pursuant to Fed.R.Civ.P. 6(b) and 60(b) after finding that Hill’s Pet’s failure to file a timely opt-out notice was the result of excusable neglect, not bad-faith, and that UCB would not be substantially prejudiced.
Analysis
This court reviews the district court’s decision for abuse of discretion, which allows for reversal only if the district court applied the wrong legal standard or relied on clearly erroneous findings of fact.
See Peters v. Nat’l R.R. Passenger Corp.,
The Supreme Court addressed the meaning of “excusable neglect” in
Pioneer Inv. Servs. Co. v. Brunswick Assocs. Ltd. P’ship,
On appeal, UCB urges this court to adopt a
per se
rule that garden variety attorney inattention can never constitute excusable neglect. We decline and uphold the district court. The
Pioneer
standard precludes the adoption of any such
per se
rule. The Court in
Pioneer
purposely fashioned a flexible rule which, by its nature, counsels against the imposition of a
per se
rule on attorney neglect. “Although
*1210
inadvertence, ignorance of the rules, or mistakes construing the rules do not usually constitute ‘excusable’ neglect, it is clear that ‘excusable neglect’ ... is a somewhat ‘elastic concept’ and is not limited strictly to omissions caused by circumstances beyond the control of the movant.”
Id.
at 392,
UCB argues that some of our sister circuits have suggested that certain types of attorney neglect can never constitute excusable neglect. The Eighth Circuit has stated in a recent case, “Notwithstanding the ‘flexible’
Pioneer
standard, experienced counsel’s misapplication of clear and unambiguous procedural rules cannot excuse his failure to file a timely notice of appeal.”
Lowry v. McDonnell Douglas Corp.,
