Dismissed by published opinion. Judge WILKINSON wrote the opinion, in which Judge RUSSELL and Judge HAMILTON joined.
OPINION
The question before us is whether this court has jurisdiction to review a district court decision compelling a company to submit to discovery where it is not a party to the underlying litigation. Because we find that this nonfinal discovery order does not fall under the collateral order
exception of Cohen v. Beneficial Industrial Loan Corp.,
I.
This appeal traces its origins to a lawsuit filed in Michigan federal court. See Mike’s Train House, Inc. v. Lionel Trains, Inc., No. CA 93-60138 (E.D.Mich.). The Michigan litigation involves antitrust allegations in the model trains market. These trains come in a variety of sizes, or “gauges,” including 0 gauge, HO gauge, and N gauge. Both parties to the Michigan litigation manufacture 0 gauge trains and related products, and the plaintiff in that case, Mike’s Train House, is a former distributor for the defendant, Lionel Trains, Inc. Mike’s alleges that when it decided to begin manufacturing 0 gauge trains on its own, Lionel sought an agreement with Mike’s to restrict output. Mike’s further alleges that its refusal to agree to those output restrictions led Lionel to terminate the distributorship. Mike’s maintains that these actions constitute a misuse of monopoly power in violation of section two of the Sherman Act. See 15 U.S.C. § 2.
In response, Lionel contends that it is not a monopolist because its share of the total train market — which includes all gauges — is too small. Mike’s, however, has contested Lionel’s broad view of the market. It has attempted to prove that 0 gauge products constitute the relevant market and that Lionel monopolizes that market. To support this contention, Mike’s has sought information from other model train manufacturers. The information was sought through subpoenas requesting business records regarding (1) annual sales revenues, (2) total annual revenue on a product by product basis, and (3) the costs of goods sold.
One of these subpoenas was served on MDK, Inc., a North Carolina manufacturer of 0 gauge products. MDK, arguing that the subpoena sought confidential commercial information and trade secrets, filed a motion in North Carolina federal district court to quash the subpoena. 1 A hearing on MDK’s *119 motion was held before a magistrate judge in July 1993. The magistrate determined that Mike’s was acting in good faith in seeking information from MDK. The magistrate further determined that Mike’s had a critical need for the information because it would be used to determine the relevant market and the presence of monopoly power. The magistrate therefore concluded that the subpoena could be enforced and ordered the parties to negotiate an appropriate confidentiality order to safeguard the information subject to discovery. The magistrate also ordered Mike’s to reimburse MDK for the costs it would incur in complying with the subpoena. This decision was subsequently upheld by the district court, and the parties proceeded to discuss the scope of the confidentiality order. MDK now appeals, claiming the rulings below inappropriately subject its vital business information to discovery.
II.
As a threshold matter, we must determine whether this court has jurisdiction to review the decision below. Circuit courts may hear “appeals from all final decisions of the district courts of the United States.” 28 U.S.C. § 1291. This finality requirement is a “historic characteristic of federal appellate procedure,”
Cobbledick v. United States,
Consequently, appellate review will generally be limited to those decisions “which end[ ] the litigation on the merits and leave[ ] nothing for the court to do but execute the judgment.”
Catlin v. United States,
III.
MDK nonetheless contends that the discovery ruling here is reviewable and advances two bases for appellate jurisdiction.
*120
First, MDK argues that because Mike’s seeks discovery of MDK’s trade secrets, review of the discovery decision is proper at this time. Second, MDK maintains that the district court’s decision constitutes a collateral order reviewable under the doctrine enunciated in
Cohen v. Beneficial Industrial Loan Corp.,
A.
MDK’s position that orders mandating the discovery of trade secrets are appeal-able relies on the Tenth Circuit’s holding in
Covey Oil v. Continental Oil Co.,
B.
We are similarly unpersuaded that jurisdiction over this appeal is conferred by the collateral order doctrine of
Cohen v. Beneficial Industrial Loan Corp.,
Such claims have rarely proved convincing, however, and courts have rather routinely declined to extend the collateral order doctrine to discovery rulings.
See In re Insurers Syndicate,
We do not believe, however, that these factors support application of the collateral order doctrine to discovery disputes such as this one. Whatever the propriety of allowing immediate review of orders quashing subpoenas seeking discovery from non-parties, that exception plainly does not apply here as a denial of discovery is not involved. Furthermore, MDK’s position as a nonparty does not automatically mean that this controversy constitutes an independent question under
Cohen.
While the district court’s order compelling discovery may seem a self-contained piece of litigation when viewed in isolation, that view fails to capture the full scope of these proceedings. The discovery order in question is but one of several discovery requests Mike’s has made in order to secure the information necessary to prosecute its claim of monopolization against Lionel. Resolving the issue of whether Mike’s will be able to secure this information from MDK perforce impacts the manner in which the Michigan trial will be conducted. Likewise, the time required to resolve an appeal of the North Carolina decision can only delay resolution of the Michigan litigation. Thus, this appeal cannot be considered apart from the course of the main litigation, a'necessary prerequisite for application of the collateral order doctrine.
See Cohen,
The order at issue here also fails to fulfill the
Cohen
requirement that review be unavailable. While it may be the case that the discovery order could not be effectively reviewed after the conclusion of the Michigan litigation, because MDK is not a party to that litigation and because discovery will have already occurred, that determination does not end our inquiry. The collateral order doctrine’s concern with appealability is not simply a narrow concern about the availability of appeal upon final judgment. Rather, the doctrine addresses the worry that an aggrieved party will be denied review entirely.
See Firestone,
Here, MDK cannot claim that it could never obtain review absent the appeal at bar. Courts have long recognized that a party sufficiently exercised over a discovery order may resist that order, be cited for contempt, and then challenge the propriety of the discovery order in the course of appealing the contempt citation.
See Corporacion Insular de Seguros v. Garcia,
IV.
In declining jurisdiction over the controversy here, we follow a long line of cases holding that courts of appeals lack jurisdiction to review orders compelling discovery of nonparties.
See Cobbledick,
DISMISSED.
Notes
. The original motion requested that a subpoena by Lionel seeking information from MDK be quashed as well. However, the scope of that subpoena has apparently been narrowed to the *119 point where it is moot as far as MDK is concerned. The only issue before us, therefore, is Mike's discovery request.
. For similar reasons we decline to rely on the Third Circuit’s case,
Smith v. Bic Corp.,
. A few courts have also allowed appeal even where the underlying case and the discovery order arose in the same circuit.
See Heat & Control, Inc. v. Hester Indus., Inc.,
. While we conclude that we would lack jurisdiction to review the discovery proceedings even if those proceedings had been terminated and the scope of discovery set, we must point out that, as of oral argument, the action below had yet to be concluded. There, both parties indicated that negotiations regarding the parameters of the protective order were not completed. We thus cannot even say that this case meets the collateral order doctrine's initial condition that the order below conclusively determine the question at issue.
See Gulfstream Aerospace Corp. v. Mayacamas Corp.,
