OPINION AND ORDER
PER CURIAM.I. Overview
The Panel, pursuant to 28 U.S.C. § 1407, previously transferred an action pending in the District of Kansas to the District of Connecticut and, with the consent of that court, assigned it to the Honorable T. Emmet Clarie for coordinated or consolidated pretrial proceedings with • an action pending there.1 Since the above-captioned action appeared to raise questions of fact common to the actions in the transferee district, the Panel ordered the parties to show cause why it should not likewise be transferred to the District of Connecticut for centralized pretrial proceedings. Except for plaintiff State of California and defendant Union Oil Company of California (hereinafter referred to as “California” and “Union,” respectively), both of whom oppose transfer, all parties generally agree that the California action should be included with the Kansas and Connecticut actions for coordinated or consolidated pretrial proceedings. These parties disagree, however, over whether the litigation should be retransferred to the Northern District of California or remain in the District of Connecticut.
We find that this tag-along action involves questions of fact common to the actions now pending for pretrial purposes in the District of Connecticut and that its transfer to that district for inclusion in the coordinated or consolidated pretrial proceedings under Section 1407 will best serve the convenience of the parties and witnesses and promote the just and efficient conduct of this litigation.
II. The California Action
California was instituted by the State of California on its own behalf and as the representative of similarly situated political subdivisions and special districts located within the State. As a purchaser of refined petroleum products and the owner of various crude oil producing lands, California charges that eleven major oil companies have engaged in past and present violations of Sections 1 and 2 of the Sherman Anti-Trust Act (15 U.S.C. §§ 1 and 2), as well as violations of the California antitrust laws, by conspiring (1) to unreasonably restrain interstate trade in the production, transportation and refining of crude oil and in the distribution and marketing of refined products, and (2) to monopolize the aforementioned commerce. More specifically, it is alleged that defendants agreed to, inter alia, eliminate competition in the production of crude oil and the sale of refined products, artificially fix the prices at which crude oil and refined products may be purchased or sold, allocate customers for refined products, and artificially create a scarcity of crude oil and refined products. Plaintiffs seek treble damages, injunctive relief against any continuation of the alleged violations, and divestiture by defendants of their interest, control or ownership of the production of crude oil in California.
III. The Question of Inclusion of the California Action
During oral argument before the Panel, plaintiff California submitted that “all the facts or sufficient facts are not yet known to be able to say with particularity — these are the common facts and these are the uncommon facts, and that one is necessarily outweighing the other. *251We are confronted with a situation where there will be common facts and uncommon facts, and a great deal of common issues and uncommon issues.”2 Nonetheless, California maintains either that California should be left alone or that the whole litigation should be re-transferred to join California in the Northern District of California. Plaintiff argues that California constitutes a distinct market for crude oil and refined products because of the state’s (1) crude oil production, (2) isolation from other domestic crude oil production, (3) substantial refining facilities, and (4) separate federal import restrictions, until recently, on foreign crude oil. Defendant Union, strongly opposing California’s involvement in any coordinated or consolidated pretrial proceedings, adds that, on account of the distinctiveness of the California market, proving a conspiracy exists in the production, transportation and refining of crude oil and the marketing of refined products in California will be different from the evidence required to demonstrate the presence of a conspiracy in Kansas and Connecticut concerning the same activities. Union and California stress that many factual differences between California and the litigation in the transferee district arise from California’s ownership of oil producing lands. Union also fears that transfer of California will delay its resolution.
We are persuaded that California should be included in the coordinated or consolidated pretrial proceedings. All eleven defendants in California are already defendants in the litigation in the transferee district. All of them, except Union, favor transfer. Plaintiff California, as we mentioned earlier, recognizes the commonality of factual issues among the various actions involved here, but seems primarily concerned about keeping its action at home. In considering whether to include an action under Section 1407, we are necessarily influenced by the pleadings. See In re Professional Hockey Antitrust Litigation, 369 F.Supp. 1119, 1120 (Jud.Pan.Mult.Lit.1974). The amended complaint in California, like the complaints in Kansas and Connecticut, contain substantially similar allegations that the defendants violated the federal antitrust laws by conspiring to fix prices and eliminate competition from the wellhead to the ultimate consumer, the gamut of the vertically-integrated, international petroleum industry. These allegations, prima facie, raise extremely complex, common factual questions. As only Union would have us believe, we cannot, upon analyzing the three complaints, accept the proposition that the California oil industry is an island unto itself.3 California’s inclusion in the ongoing Section 1407 proceedings will therefore eliminate duplication of discovery, prevent the possibility of inconsistent pretrial rulings, and conserve effort on the part of the parties, the witnesses and the judiciary.
We also acknowledge the existence of factual issues unique to California. Similarly, factual issues unique to Connecticut and Kansas were present when we initially considered this litigation. The transferee judge, however, has the broad discretion to design a pretrial program in which discovery on any unique issues can proceed concurrently with discovery on the common issues. See In re Republic National-Realty Equities Securities Litigation, 382 F.Supp. 1403, 1405-06 (Jud.Pan.Mult.Lit.1974). Such a program will allow the litigation to proceed expeditiously in all arenas, while the parties can take advantage of the benefits to be gained by coordinated or consolidated pretrial proceedings.
IV. The Question of Retransfer
The State of Kansas joins California in its alternative position urging the Panel *252to retransfer this litigation to the Northern District of California. Generally, plaintiff California argues that California is the “center of gravity” for pretrial purposes because it is the dominant state in this litigation in terms of crude oil production, refining facilities and petroleum product consumption; many of the alleged conspiratorial acts occurred there; several defendants’ headquarters along with many relevant documents are located there; several witnesses reside there; California is more advanced than either of the other two actions in light of an extensive investigation conducted by the State prior to the commencement of its action; and the State has the experience and financial resources to prosecute this litigation aggressively.
In the past, we have been extremely reluctant to retransfer litigation under Section 1407. See, e. g., In re Nissan Motor Corporation Antitrust Litigation, 385 F.Supp. 1253, 1255-56 (Jud.Pan.Mult.Lit.1974); In re Air Crash Disaster at Florida Everglades on December 29, 1972, 368 F.Supp. 812, 813 (Jud.Pan.Mult.Lit.1973); In re Glenn W. Turner Enterprises Litigation, 368 F.Supp. 805 (Jud.Pan.Mult.Lit.1973); In re Plumbing Fixtures, 332 F.Supp. 1047 (Jud.Pan.Mult.Lit.1971); In re Antibiotic Drugs, 320 F.Supp. 586 (Jud.Pan.Mult.Lit.1970). This reluctance is founded on mainly two grounds: first, the question of the most appropriate transferee forum should not be relitigated every time another action is considered for inclusion in the centralized pretrial proceedings of a previously transferred litigation because it could destroy the effectiveness of Section 1407; and secondly, effort expended by the original transferee court in supervising the litigation would be wasted. These principles, especially the latter one, are certainly applicable here and,, therefore, we see no reason to order re-transfer.
Addressing ourselves more specifically to California’s arguments, we observe that there is no real center of gravity in this litigation for pretrial purposes inasmuch as defendants’ headquarters, their documents and their witnesses, which of course will be the focal points of discovery, are scattered throughout the country. Moreover, we are advised that extensive investigations preceded the filing of not only California, but Kansas and Connecticut as well. Furthermore, on the basis of California’s past performances in multidistrict litigation, we are confident that its experience and resources will be put to good use regardless of the location of the transferee district.
It is therefore ordered that, pursuant to 28 U.S.C. § 1407, the action entitled The State of California, etc. v. Standard Oil Company of California, et al., N.D. Cal., Civil Action No. C-75-1322-5C, be, and the same hereby is, transferred to the District of Connecticut and, with the consent of that court, assigned to the Honorable T. Emmet Clarie for coordinated or consolidated pretrial proceedings with the Kansas and Connecticut actions.
. In re Petroleum Products Antitrust Litigation, 393 F.Supp. 1091 (Jud.Pan.Mult.Lit.1975).
. Transcript at 15.
. See generally In re Midwest Milk Monopolization Litigation, 379 F.Supp. 992 (Jud.Pan. Mult.Lit.1974), in which we transferred a tag-along action despite defendants’ arguments that the action should not be processed with the previously transferred litigation because of the addition of a new, distinct market.