ORDER AND REASONS

JANE TRICHE MILAZZO, District Judge.

The Court now examines subject matter jurisdiction sua sponte. Plaintiffs have failed to adequately plead diversity jurisdiction in their Complaint. Accordingly, Plaintiffs shall amend their Complaint to correct this jurisdictional defect within 20 days of the entry of this Order.

This Court is duty-bound to examine the basis of subject matter jurisdiction sua sponte.1 Subject matter jurisdiction in this case is premised upon diversity of citizenship.2 Cases arising under § 1332 require, inter alia, complete diversity of citizenship.3 "The concept of complete diversity requires that all persons on one side of the controversy be citizens of different states than all persons on the other side."4

For purposes of diversity jurisdiction, a corporation is deemed to be a citizen of every state in which it has been incorporated and of the state where it has its principal place of business."5 Thus, "[i]n cases involving corporations, allegations of citizenship must set forth the state of incorporation as well as the principal place of business for each corporation."6 A party's citizenship "cannot be established argumentatively or by mere inference."7 In their Complaint, Plaintiffs have failed to set forth the principal place of business or state of incorporation of any party.

Plaintiffs' failure to properly allege citizenship is not fatal.8 28 U.S.C. § 1653 provides that "[d]efective allegations of jurisdiction may be amended, upon terms, in the trial or appellate courts." A district court's decision to permit amendment under § 1653 turns on the nature of the jurisdictional defect.9 Where "jurisdictional problems are of the `technical' or `formal' variety, they fall squarely within the ambit of § 1653."10 Thus, amendment should be allowed where "`diversity jurisdiction was not questioned by the parties and there is no suggestion in the record that it does not in fact exist.'"11 The record in this matter does not reveal, nor has any party argued, that diversity jurisdiction is not present. Accordingly, Plaintiffs are granted leave to amend the Complaint to allege "distinctly and affirmatively" the jurisdictional facts that give rise to diversity jurisdiction.

CONCLUSION

For the foregoing reasons, the Court finds that Plaintiffs have failed to adequately allege diversity of citizenship. Plaintiffs are granted leave to amend their Complaint within 20 days from the entry of this Order. Failure to file timely an amended notice will result in dismissal for lack of subject matter jurisdiction.