This аppeal began as a challenge to the merits of a grant of summary judgment in the underlying breach of contract case. At oral argument, we shifted the focus of the appeal by inquiring sua sponte into the possibility that the parties were not completely diverse and that the district court therefore lacked subject matter jurisdiction in this case. We ordered supplemental briefing regarding the citizenship of appellee Manny, Moe & Jack Corp., Puerto Rico, Inc. (“Pep Boys PR”), and then, while retaining appellate jurisdiction, remanded for an evidentiary hearing on the same subject. With the benefit of extensive fact-finding by thfe district court, we now conclude that Pep Boys PR has its *58 prinсipal place of business in, and is thus a citizen of, Puerto Rico. Because the appellants are also citizens of Puerto Rico, the parties are not diverse. We therefore vacate the judgment and, given the absence of federal subject matter jurisdiction, remand to the district court with instructions to remand the ease to the court from which it was improvidently removed. We also clarify our law regarding the principal place of business determination.
I.
On March 15, 2002, appellants Energy Tech Corp. (“ETC”) and Tomas Díaz Rodriguez sued automotive supply retailer Pep Boys PR and its parent company, Pep Boys Corp. (“Pep Boys”), in the Court of First Instance of Puertо Rico, Bayamón Superior Division. The complaint alleged (1) that Pep Boys PR was liable for breaching a contract under which it was to serve as the exclusive Puerto Rico seller of an ETC product called Super FuelMax and (2) that Pep Boys had tortiously interfered in the relationship between ETC and Pep Boys PR by inducing Pep Boys PR to break the contract.
The appellees removed the case to federal court on April 9, 2002. The notice of removal asserted that
[defendants ... were incorporated in states other than Puerto Rico (Pennsylvania and Delaware), and have their principal places of business in Philadelphia, Pennsylvania. This action, therеfore, may be removed from the courts of the Commonwealth of Puerto Rico to this District Court pursuant to 28 U.S.C. § 1441(b).
The appellants did not challenge the existence of diversity jurisdiction at this juncture, and the appellees answered the complaint on May 8, 2002.
On February 28, 2003, the appellees filed a motion for summary judgment; on March 11, 2003, the apрellants filed a motion for partial summary judgment. Based on the recommendation of a magistrate judge, the district court granted the appellees’ motion for summary judgment, denied the appellants’ motion for partial summary judgment, and filed an order dismissing the suit with prejudice. See Diaz-Rodriguez v. Pep Boys Corp., No. 02-10536 (D.P.R. Mar. 29, 2004). The appellants filed a notice of appeal on April 28, 2004.
The briefs filed by the parties before oral argument were directed entirely to the merits of the district court’s grant of summary judgment. Those arguments are predicated, however, on the existence of subject matter jurisdiction. We cannot consider the merits of the district court’s ruling on appeal if it did not have jurisdiction to adjudicate thе issues before it in the first instance.
See, e.g., Espinal-Dominguez v. Puerto Rico,
The only conceivable basis for federal jurisdiction in this case is diversity of citizenship. 28 U.S.C. § 1332(a). “Diversity jurisdiсtion exists only when there is
complete
diversity, that is, when no plaintiff is a citizen of the same state as any defendant.”
Gabriel v. Preble,
Neither pаrty questioned the existence of complete diversity during the district
*59
court proceedings. Nevertheless, concerned about the possibility that ETC and Pep Boys PR were non-diverse, we raised the jurisdictional issue
sua sponte
at oral arguments and ordered supplemental briefing.
1
Cf. In re Perry,
Viewing the supplemental briefs as inconclusive, we retained appellate jurisdiction while remanding to the district court to hold an evidentiary hearing as to the locus of Pep Boys PR’s principal place of business. The district court complied, holding a hearing and making extensive findings of fact. We now determine Pep Boys PR’s principal place of business de novo based on the district court’s factual findings. 3
II.
We have identified three tests for determining a corporation’s principal place of business:
One is the “nerve -center” test which searches for the location from where the -activities of the corporation are controlled . and directed. The two other tests are the “cepter of corporate activity” test, i.e., where the corporation’s day-to-day management takes place; and the “locus of the operations of the corporation” test, i,e., where the bulk of the corporation’s actual physical operations are located.
Topp v. CompAir Inc.,
While the tests that we have identified are “not necessarily inconsistent,”
Topp,
First Circuit precedent offers only limited guidance on hpw to determine a corporation’s principal place of business when the thrеe tests' point to different locations. Our cases indicate that the nerve center test governs in the context of a corporation with “complex and farflung activities” or a corporation without physical operations
(e.g.,
a holding company).
Topp,
Pep Boys PR has physical operations and is not a complex or far flung corporation. Therefore, the nerve center test does not control and we must look instead to the center of corporate activity test or the locus of operations test. We have never explained, however, a basis for choosing between these two tests.
See Savis, Inc. v. Warner Lambert, Inc.,
Given our recognition of the nerve center and locus of operations tests, the center of corporate activity test is largely redundant. In some cases, it involves “an analysis and rеsult similar to the one employed ... under the rubric of the nerve center test.”
Topp,
Our case law confirms this redundancy. We have explicitly alluded to the center of corporate activity test in only four cases. In two of those cases, we concluded that all threе tests would point to the same location as the principal place of business.
See Rodriguez v. S K & F Co.,
In summary, the case law reveals that our references to the center of corporate activity test have always been dicta — that is, comments “made while delivering a judicial opinion, but ... unnecessary to the decision in the case.”
Black’s Law Dictionary
(8th ed.2004) (defining obiter dictum). Indeed, even the case which initially referred to the center of corporate activity test did not treat that test as determinative.
See de Walker,
Unlike a holding, which binds newly constituted panels in a multi-panel circuit,
see Eulitt v. Me. Dep’t of Educ.,
It is well settled in this circuit that the nerve center test applies only to farflung corporations or corporations without physical operations.
See Topp,
We have described the lоcus of operations test as “search[ing] for the loca
*62
tion of the corporation’s actual physical operations.”
Taber Partners,
It is true that many of Pep Boys PR’s administrative and executive functions are based outside of Puerto Rico. The district court found that all but one of the members of Pep Boys PR’s Board of Directors work in Philadelphia. Major policy decisions are made in Philadelphia, and the merchandise, advertising, distribution, finance, and human resources departments are located there. These are the types of factors that would be relevant under the nerve center test.
See Topp,
The conclusion that Pep Boys PR’s principal place of business is in Puer-to Rico has substantial implications in this case. Pep Boys PR is a citizen of Puerto Rico.
See
28 U.S.C. § 1332(c)(1) (“[A] corporation shall be deemed to be a citizen of any State by which it has been incorporated and of the Statе where it has its principal place of business.”). It is undisputed that the appellants were and are also citizens of Puerto Rico. Thus, the parties are not diverse. There being no other basis for federal jurisdiction, we are compelled to vacate the district court’s grant of summary judgment on the ground that it lacked subject matter jurisdiction,
see Am. Fiber & Finishing, Inc. v. Tyco Healthcare Group, LP,
So ordered.
Notes
. Pep Boys PR is the only party whose citizenship is in question; it is undisputed that the parties are otherwise diverse.
. The district court supportably found thаt all but one of Pep Boys PR’s directors and officers are located in Philadelphia and that many of the decisions regarding Pep Boys PR's operations are made in Philadelphia. Pep Boys PR also had one officer located in Puerto Rico. When this suit was removed to federal court in 2002, the officer in Puerto Rico was the Divisional Vice President, who supervised the day-to-day operations of Pep Boys PR's stores.
.On reflection, the better practice might have been to ask the district court to make the legal determination in the first instance.
See Taber Partners, I v. Merit Builders, Inc.,
. The framewоrk we set forth here also has much in common with the sensible "total activity” test adopted by a number of our sister circuits.
See Savis,
(1) when considering a corporation whose operations are far flung, the sole nerve center of that corporation is more significant in determining principal place of business; (2) when a corporatiоn has its sole operation in one state and executive offices in another, the place of activity is regarded as more significant; but (3) when the activity of a corporation is passive and the "brain” of the corporation is in another state, the situs of the corporation’s "brain” is given greater significance.
J.A. Olson Co. v. City of Winona,
. There is somеthing faintly inequitable about a party letting a case go to judgment without questioning the court's jurisdiction, losing, and then profiting from a jurisdictional defect noted
sua sponte
by the appellate court. Still, it was the appellees who removed the case. And, moreover, federal courts are courts of limited jurisdiction. Consequently, such courts must "monitor their jurisdictional boundaries vigilantly.”
Id.
at 139. It follows that parties cannot confer subject matter jurisdiction on a federal court by acquiescence or oversight.
See United States v. Horn,
