The dc-circuit affirmed the district court’s dismissal of PhantomALERT Inc.’s antitrust claims against Apple Inc., holding that the amended complaint failed to state a claim under Section 1 and Section 2 of the Sherman Antitrust Act, as well as California state law. The court determined that the district court’s order was a final, appealable decision under 28 U.S.C. § 1291 because it terminated the litigation on the merits and left nothing for the court to do but execute the judgment. Applying de novo review, the court held that PhantomALERT failed to plausibly allege relevant product markets, a threshold requirement for antitrust liability. For its tying claim under Section 1 and monopolization claim regarding general app access under Section 2, the court found the complaint lacked allegations demonstrating that the App Store constituted a distinct single-brand aftermarket free from reasonable substitutes, such as web browsers. The court rejected PhantomALERT’s “lock-in” theory due to insufficient factual support and its alternative “foremarket power” theory because it was forfeited by failing to raise it in the district court. Regarding the claim for monopolization of Covid-19-related tracing apps under Section 2, the court found the complaint failed to define the market boundaries, confusing a market for “access” to apps with a market for the apps themselves and offering only conclusory assertions that such apps were not substitutable for other applications. The practical consequence is that the dismissal of PhantomALERT’s original complaint without prejudice stands, and leave to late-file the amended complaint was properly denied as futile. The court clarified that the order does not operate as a dismissal with prejudice or trigger res judicata; therefore, PhantomALERT remains free to file a separate action in district court, provided it can adequately plead relevant product markets and other necessary elements of its antitrust claims.