Del. Code tit. 8 § 367
Any action to enforce the balancing requirement of § 365(a) of this title, including any individual, derivative or any other type of action, may not be brought unless the plaintiffs in such action own individually or collectively, as of the date of instituting such action, at least 2% of the corporation's outstanding shares or, in the case of a corporation with shares listed on a national securities exchange, the lesser of such percentage or shares of the corporation with a market value of at least $2,000,000 as of the date the action is instituted. This section shall not relieve the plaintiffs from complying with any other conditions applicable to filing a derivative action including § 327 of this title and any rules of the court in which the action is filed.
8 Del. C. § 367