Appellant, Ramallo Bros. Printing, Inc. (“Ramallo”), appeals from the district court’s dismissal of its complaint on res judicata and collateral estoppel grounds. We AFFIRM.
I.
A.
Briefly summarized, the facts as alleged in Ramallo’s complaint are as follows. Ra-mallo is a commercial printer whose business includes, among other things, the printing of corporate supplements that are inserted in and delivered with newspapers of general circulation in Puerto Rico. Appellees, El Día, Inc. (“El Día”), and Editorial Primera Hora, Inc. (“Editorial Prim-era Hora”), own and publish newspapers in Puerto Rico that occasionally contain corporate supplements. El Día owns and prints El Nuevo Día, a leading newspaper in Puerto Rico. Editorial Primera Hora owns Primera Hora, a Puerto Rican daily newspaper printed by El Día.
Appellee, Advanced Graphic Printing, Inc. (“AGP”), is a commercial printing business established by El Día as a department of El Nuevo Día. Among other things, AGP prints corporate supplements for insertion in El Nuevo Día and Primera Hora. As a matter of policy, El Día and Editorial Primera Hora require that all corporate supplements inserted into El Nuevo Día and Primera Hora be printed by AGP.
On February 24, 2006, Ramallo celebrated its fortieth anniversary. To commemorate the event, Ramallo prepared and printed a corporate supplement to celebrate and advertise its accomplishments as a commercial printer. Ramallo tendered its corporate supplement to El Día for insertion in El Nuevo Día and Primera Hora, but Carlos Nido, 1 El Nuevo Dia’s Vice President of Sales, informed Ramallo that its fortieth anniversary supplement could not be inserted into either El Nuevo Día or Primera Hora because it had not been printed by AGP. Ramallo thereafter filed this lawsuit, challenging the policy that makes printing by AGP a requirement for insertion of corporate supplements into El Nuevo Día and Primera Hora.
B.
In 2002, approximately four years before Ramallo filed this case, Ramallo filed another lawsuit against the same defendants that are sued here.
See Ramallo Bros. Printing, Inc. v. El Día, Inc.,
Creative Minds performs all the functions needed to produce the supplement, including preparation of editorial content and artwork, sales of advertising, coordination of the printing and insertion in the newspaper. Defendants’ stated reasons for the policy of using only Creative Minds to produce corporate supplements are the need to maintain editorial integrity, to ensure the content is accurate and comports with its style and content policies, and to take advantage of cost savings.
Id. at 124-25.
In
Ramallo I,
Ramallo challenged El Dia’s policy of inserting into its newspapers only corporate supplements produced and printed by Creative Minds. Ramallo claimed, among other things, that such policy violated both federal and Commonwealth antitrust laws. The district court rejected Ramallo’s claims, finding no antitrust violations at all. In particular, the district court found that (1) El Dia’s supplement policy had no significant anti-competitive effect, given that corporate supplements constitute “a
de minimis
part of the advertising and printing business in Puerto Rico,”
Ramallo I,
C.
In this case, in its amended complaint, 2 Ramallo challenges the newspapers’ refusal to insert its fortieth anniversary corporate supplement in El Nuevo Día and Primera Hora. Specifically, Ramallo alleges that, by tying the printing of the fortieth anniversary supplement to the delivery of that supplement in El Nuevo Día and Primera Hora, the newspapers restrained trade and eliminated competition in the printing and delivery markets for corporate supplements, all in violation of the Sherman Act and the antitrust laws of Puerto Rico.
The district court (in the person of the same district judge who presided over Ra-mallo I) dismissed Ramallo’s claims, explaining:
A comparison of Plaintiffs current complaint with its complaint in Ramallo I reveals that the factual underpinning for both cases is materially identical.... Plaintiff alleges in both complaints that *89 Defendants’ corporate supplement printing policy is intended to foreclose competition in the printing market....
Indeed, the only difference between the factual allegations in these two cases is that Ramallo I focused on the effect that Defendants’ policy had on Plaintiffs ability to print supplements for third parties, whereas Plaintiffs current claims challenge the application of Defendants’ policy to a corporate supplement that Plaintiff recently printed for itself, rather than a third party.
Dist. Ct. Order at 8.
The district court rejected Ramallo’s argument that the doctrines of res judicata and collateral estoppel were inapplicable because the two cases were different, the more recent case involving events that post-dated the earlier case altogether, and the two cases involving supplements prepared for different purposes. The district court found that the distinctions advanced by Ramallo were legally insignificant. Characterizing Ramallo’s new case as “nothing more than a second challenge to Defendants’ overall corporate supplement printing policy,” the district court determined that Ramallo’s current claims were barred by the doctrines of both res judica-ta and collateral estoppel.
II.
A.
We review
de novo
a district court’s dismissal of a case on res judicata and collateral estoppel grounds.
Gonzalez-Pina v. Rodriguez,
B.
The Supreme Court long ago described the doctrine of collateral estoppel, or issue preclusion, as follows:
The general principle announced in numerous cases is that a right, question, or fact distinctly put in issue, and directly determined by a court of competent jurisdiction, as a ground of recovery, cannot be disputed in a subsequent suit between the same parties or their privies; and, even if the second suit is for a different cause of action, the right, question, or fact once so determined must, as between the same parties or their privies, be taken as conclusively established, so long as the judgment in the first suit remains unmodified. This general rule is demanded by the very object for which civil courts have been established, which is to secure the peace and repose of society by the settlement of matters capable of judicial determination. Its enforcement is essential to the maintenance of social order; for the aid of judicial tribunals would not be invoked for the vindication of rights of person and property if, as between parties and their privies, conclusiveness did not attend the judgments of such tribunals in respect of all matters properly put in issue, and actually determined by them.
S. Pac. R.R. Co. v. United States,
A party seeking to invoke the doctrine of collateral estoppel must establish that (1) the issue sought to be precluded in the later action is the same as that involved in the earlier action; (2) the issue was actually litigated; (3) the issue was determined by a valid and binding final judgment; and (4) the determination of the issue was essential to the judgment.
Keystone,
In its appellate brief, Ramallo barely addresses the district court’s decision regarding collateral estoppel. Ramallo states that “[t]he District Court was wrong” but provides no argument about why the district court was wrong. Generally, such perfunctory treatment is insufficient to preserve an issue on appeal.
See Torres-Arroyo v. Rullan,
Although we could end our opinion here, we nonetheless note that the record adequately supports the district court’s collateral estoppel decision. In its amended complaint in the later lawsuit, Ramallo alleges that, by requiring AGP to print all corporate supplements inserted into El Nuevo Día and Primera Hora, the defendants engaged in anti-competitive conduct by unlawfully tying the market for printing corporate supplements to the market for delivering those supplements, by coercing Ramallo into having its corporate supplements printed by AGP, by preventing Ramallo from reaching the public reached by El Nuevo Día and Primera Hora, and by monopolizing the printing and/or delivery markets. The district court in Ramallo I considered the equivalent of each of these allegations in deciding the central issue of the case: whether the newspapers’ corporate supplement policy violated federal and local antitrust laws. Finding no unlawful tying, no coercion, and no monopolization, the Ramallo I court determined that the newspapers’ corporate supplement policy did not violate the law as alleged by Ramallo. We see no material distinction between the issues decided by the district court in Ramallo I and the issues Ramallo seeks to have decided here.
While we acknowledge that changed circumstances may defeat collateral estoppel, collateral estoppel remains appropriate where the changed circumstances are not material.
Scooper Dooper, Inc. v. Kraftco Corp.,
For example, it is immaterial that Ra-mallo sued in its capacity as a printer for third parties in the first case and in its capacity as an advertiser for its own company in the second. The challenged policy did not change in any significant way from one suit to the next; 3 the policy was applied in the same manner whether Ramallo acted in its capacity as a printer for others or as a printer for itself; and the policy’s legality under the antitrust laws in no way turned on what role — printer or advertiser — Ramallo was playing when it sought to insert a corporate supplement into El Nue-vo Día and Primera Hora.
The temporal difference between the events in the two suits — -namely, that the fortieth anniversary event triggering the second case did not happen until after judgment in the first case was entered — is likewise immaterial. Indeed, we have held in the past that a plaintiff cannot avoid the bar of collateral estoppel simply by suing a defendant for continuing the same conduct that was found to be lawful in a previous suit brought by the same plaintiff. In
Pignons S.A. de Mecanique v. Polaroid Corp.,
In its appellate brief, in a five-sentence section addressing collateral estoppel, Ra-mallo suggests that, at the very least, the district court erred in dismissing its discrimination, refusal to deal, and essential facilities claims because none of the issues related to those claims was raised or litigated in
Ramallo I.
Relying on
Pignons,
Collateral estoppel has long been employed as a means of ensuring repose. “Such repose is justified on the sound and obvious principle of judicial policy that a losing litigant deserves no rematch after a defeat fairly suffered, in adversarial proceedings, on an issue identical in substance to the one he subsequently seeks to raise.”
Astoria Federal Sav. and Loan Ass’n v. Solimino,
C.
Finding no reason to disturb the district court’s collateral estoppel decision, we will not dwell on the matter of res judicata. Briefly, we find that every claim raised in this case was raised or could have been raised in Ramallo I.
III.
For the reasons explained above, we AFFIRM the judgment of the district court.
Notes
. While Carlos Nido was named as a defendant in this case, no claims were asserted against him, no relief was sought from him, and he is not a party to this appeal.
. We do not consider claims raised in Ramal-lo’s initial complaint that were not restated in its amended complaint. See
Kolling v. American Power Conversion Corp.,
. In its reply brief, Ramallo suggests that the corporate supplement policy challenged in the first case was not the same as the policy challenged in the second case. Instead, according to Ramallo, the policy challenged in the second case was “completely new,” given that the sister printing company in the second case was no longer Creative Minds (a unit of AGP) but was, instead, AGP acting as an internal department of
El Nuevo Día.
Even if we were to consider an argument raised for the first time in Ramallo's reply brief, we deem the difference between the two printers-both sister companies — insignificant to the ultimate issue decided.
But see Sandstrom v. ChemLawn Corp.,
