This is an appeal from a judgment of the United States District Court for the Northern District of New York, McAvoy, C. /., dismissing Northern Assurance Company of America’s (Northern) complaint against Square D Company (Square D) on grounds of res judicata. The district court held that Northern’s claims were barred because of the denial of Northern’s motion to amend its earlier complaint to add Square D as a defendant in a suit brought against another party. Because Northern was under no obligation to bring its claims against Square D in the earlier suit, we hold that the denial of Northern’s motion to amend its complaint in the earlier suit does not bar its claims in this suit.
Reversed, vacated and remanded.
BACKGROUND
This suit arises out of a November 1995 fire at the home of Michael and Carole Morrell. The Morrells recovered from their insurer, Northern. After investigating the circumstances surrounding the fire, Northern believed that the electric compa *86 ny, New York State Electric & Gas Corporation (NYSEG), was at fault and, as sub-rogee of the Morrells, sued NYSEG on September 9, 1996 in the Northern District of New York, alleging negligence, strict liability and breach of warranty claims (hereinafter Northern I). On January 28,1997, NYSEG responded by adding Square D (defendant-appellee in the instant case) and the Tree Preservation Company and its employees (collectively “TPC”) as third-party defendants. NY-SEG claimed that either Square D, the manufacturer of the home’s circuit breaker, or TPC, the company that trimmed the trees around the Morrell’s home, ultimately was responsible for the fire.
Judge Pooler assigned the case to Magistrate Judge Hurd for pre-trial proceedings. The magistrate judge and the parties agreed on a scheduling order, pursuant to Fed.R.Civ.P. 16, setting April 15, 1997 as the deadline for joinder of parties. Just before the deadline, Northern requested a one week extension to add TPC as a first-party defendant. The extension was granted and TPC, but not Square D, was added as a first-party defendant. Northern claims that, despite NYSEG’s allegations against Square D, it did not pursue claims against Square D at this time because Northern did not have enough independent evidence to pursue that claim in good faith.
In early October 1997, Northern’s expert electrical engineer performed more tests to determine the cause of the fire. According to Northern, these tests demonstrated for the first time that it had a claim against Square D. On December 1, 1997, several months after the deadline for joinder of parties, Northern petitioned the court for leave to amend its complaint a second time in order to bring claims against Square D directly. The magistrate judge denied leave to amend the complaint on February 4, 1998, finding that it was untimely, that Northern had failed to explain the delay and that Northern had not presented any evidence to form the basis of a claim against Square D. The magistrate judge did not address the merits of Northern’s claims. Northern did not appeal the decision or seek reconsideration before Judge Pooler.
Instead, Northern filed this suit against Square D in the Southern District of New York on May 6, 1998, alleging essentially the same claims it attempted to add in
Northern I.
Subsequently, by consent of the parties, the case was transferred to the Northern District of New York, where it was assigned to Chief Judge McAvoy.
1
Square D moved to dismiss on grounds of
res judicata,
arguing that the magistrate judge’s denial of Northern’s petition to amend in the first suit constituted
res judi-cata
as to the claims contained within the denied amended complaint. The district court granted Square D’s motion and dismissed the action on December 29, 1998.
See Northern Assurance Co. of America v. Square D Co.,
DISCUSSION
A. Jurisdiction
Northern is a Massachusetts corporation with its principal place of business in Boston. Square D is a Delaware corporation with its principal place of business in New York City. Northern alleged damages in excess of $100,000. As such, federal jurisdiction exists based on diversity of citizenship, pursuant to 28 U.S.C. § 1332. We have appellate jurisdiction pursuant to 28 U.S.C. § 1291.
*87 B. Claim Preclusion
Square D claims, and the district court held, that claim preclusion bars Northern’s claims against Square D. It argues that the magistrate judge’s denial of Northern’s leave to amend its complaint in Northern I bars the claims contained in the proposed amended complaint. We disagree. While denial of leave to amend a complaint may have preclusive effect in some cases, claim preclusion is unavailable here because the claims sought to be added to the first suit were against an independent party and were not required to be brought in that suit.
The doctrine of claim preclusion, not to be confused with issue preclusion or collateral estoppel,
2
holds that “a prior decision dismissed ‘on the merits’ is binding in all subsequent litigation between the same parties on claims arising out of the same facts, even if based upon different legal theories or seeking different relief on issues which were or might have been litigated in the prior action but were not.”
EFCO Corp. v. U.W. Marx, Inc.,
To understand why claim preclusion is not a bar to the current suit, it is necessary to contrast our case with the typical situation where claim preclusion would apply after a denial of leave to amend. In those cases the plaintiff is seeking to add additional claims against the
same
defendant and leave to amend is denied without reaching the merits of the claim. The decision to grant or deny leave to amend rests within the discretion of the trial court.
See John Hancock Mut. Life Ins. Co. v. Amerford Int’l Corp.,
Where the plaintiff is seeking to add additional claims against the same defendant and leave to amend is denied, claim preclusion is appropriate. When claim preclusion is applied in these cases, it is not the actual decision to deny leave to amend that forms the basis of the bar.
See, e.g., Nilsen v. City of Moss Point, Miss.,
Instead, the bar is based on the requirement that the plaintiff must bring all claims at once against the same defendant relating to the same transaction or event.
See, e.g., Nilsen,
Unlike the situation described above, our case involves a plaintiff seeking to add claims against a new defendant. Northern was not required to bring its claims against Square D in
Northern I
because they are independent claims. Northern has separate and distinct causes of action against each defendant, since NY-SEG and Square D allegedly are joint tortfeasors and are not in privity.
4
North
*89
ern has “as many causes of action as there are defendants to pursue.” 18 Charles A. Wright, Arthur R. Miller & Edward H. Cooper,
Federal Practice and Procedure
§ 4407, at 52-53 (1981);
see
Restatement (Second) of Judgments § 49 cmt. a (1982) (for preclusion purposes “the claim against others who are liable for the same harm is regarded as separate”);
see also Central Hudson Gas & Elec. Corp. v. Empresa Naviera Santa S.A.,
Applying these principles, the denial of Northern’s motion for leave to amend in Northern I cannot preclude Northern’s claims against Square Í) in this action. Because Northern was under no obligation to bring the claims in Northern I, it is not barred by the normal operation of claim preclusion.
C. Policy and Judicial Economy
Square D argues that even if claim preclusion does not apply, the policies behind it, achieving finality and preventing piecemeal and wasteful litigation, warrant dismissal of Northern’s claims. This argument is unpersuasive. Northern attempted, albeit belatedly, to bring its claim against Square D in Northern I. Had leave to amend been granted, the second suit would have been avoided. Northern should not be penalized for its failure to succeed in its attempt to have all claims resolved in one lawsuit. 6
Claim preclusion should produce a sense of finality between the parties. When a party is victorious, it should not have to defend that victory again. In the present case, Square D’s victory, if it can be called that, was in not being added as a first-party defendant in Northern I. There was no decision on the merits of Northern’s claim that Square D’s circuit breaker was responsible for the house fire. Finality will not be upset by allowing this action to proceed. Furthermore, Square D will not be prejudiced. Had Northern not attempted to add its claims against Square D in Northern I, Square D would face the same claims as it will after this decision.
Square D also claims that wise judicial administration requires dismissal of Northern’s action. We disagree. While dismissal of a complaint may be justified “if the ‘claims, parties, and available relief do not significantly differ between the two actions,’ ”
Serlin v. Arthur Andersen & Co.,
Furthermore, it is unlikely that this action will waste judicial resources. The decision to consolidate this ease with Northern I or try it separately is left to the district court, which is in the best position to manage its resources.
Finally, Square D argues that we should not permit Northern to ignore the magistrate judge’s ruling by filing suit separately and thus ignoring the effect of Fed.R.Civ.P. 16 and the deadline for joinder of parties.
See United States v. McGann,
CONCLUSION
For the reasons stated herein, the district court’s decision dismissing Northern’s suit on grounds of claim preclusion is reversed. The judgment is vacated and the case is remanded for further proceedings.
Notes
. Judge Pooler became a Circuit Judge on June 19, 1998. Northern I was then apparently assigned to Chief Judge McAvoy.
. The district court used the term res judicata to describe the doctrine that it believed barred the suit. The term res judicata, however, is more appropriately defined as encompassing two separate and distinct wings of preclusion law, claim preclusion and issue preclusion, see generally 18 Charles A. Wright, Arthur R. Miller & Edward H. Cooper, Federal Practice and Procedure § 4402 (1981 & Supp.1999) (describing cases acknowledging claim and issue preclusion as separate doctrines within the broader concept of res judi- cata). Claim preclusion is at issue in our case.
. We need not decide whether Northern’s claim against Square D could have been brought at the time of Northern I because it is unnecessary to our decision. Regardless of whether or not Northern was fully aware of its claim against Square D when it sued NY-SEG, it was under no obligation to add both parties to the initial suit, as we explain later.
. There is no privity between NYSEG and Square D. Although courts have expanded the concept of privity beyond its literal meaning,
see Alpert’s Newspaper Delivery v. New York Times Co.,
. Northern will not be permitted double recovery. While multiple parties may be liable to Northern, there can be only one satisfaction of the judgment.
See St. Clair
v.
Eastern Air Lines,
. Square D also claims that Northern should have moved to reconsider the denial or appealed the denial. Faced with the burden of proving that the denial of leave to amend was an abuse of discretion, Northern cannot be faulted for deciding to institute a separate suit, something it had a right to do initially.
