ORDER AND JUDGMENT
Nancy L. Moritz, Circuit Judge
Terrence Wyles filed a complaint in state court asserting multiple claims against multiple defendants. While the state proceeding was pending, Wyles filed a complaint in federal court asserting nearly identical claims against nearly all of the same defendants. Concluding that Wyles improperly split his claims between state and federal court, the district court dismissed Wyles’ federal complaint. Because the district court erroneously concluded that Wyles’ pending state-court action precluded his parallel federal-court action, we vacate and remand for further proceedings.
Background
In March 2014, Terrence Wyles filed a complaint in Arapahoe County District Court in Colorado against 15 defendants, including his former employers, Aluminaid International, A.G. and West Hills Research & Development; several of their officers; the law firm of Loeb & Loeb, LLP; and a partner in that firm—Allen Sussman. The complaint contained nine claims that arose from Wyles’ former employment as in-house counsel for Alumi-naid and West Hills. In October 2014, Wyles filed a motion to amend the complaint, seeking to add a claim of professional malpractice against Sussman and Loeb
&
Loeb, LLP (collectively, the Loeb defendants). In January 2015, the state court denied the motion.
Six weeks later, Wyles filed this federal lawsuit. Wyles’ federal complaint is substantially similar to his state complaint except that Wyles added both a negligence claim against the Loeb defendants and a misrepresentation claim against other defendants, and also omitted two defendants who were named in the state complaint. The new negligence claim mirrored the malpractice claim that Wyles unsuccessfully sought to add in state court.
The Loeb defendants
moved to dismiss the federal complaint. In June 2015, the
district court granted the motion and in doing so, noted that Wyles could have raised all of his claims in state court. Applying the rule against claim-splitting, the district court reasoned that Wyles can’t “file two substantially identical complaints in order to evade procedural restrictions.” App. 240. Wyles appeals.
Discussion
Wyles argues the district court erred in dismissing his complaint based on the rule against claim-splitting. First, he contends that the rule only allows dismissal when the challenged state and federal actions are identical and—because his state and federal actions weren’t identical—the district court erred in dismissing his federal action based on claim-splitting. Alternatively, he contends the rule requires a plaintiff to bring all claims in one court and that he complied with the rule by bringing all of his claims in federal court after the state court denied his motion to add the malpractice claim against the Loeb defendants. The Loeb defendants, on the other hand, urge us to affirm based, on the district court’s claim-splitting rationale. But neither party addresses whether the rule against claim-splitting applies to du-plicative complaints filed in state and federal court versus duplicative complaints filed in federal courts. And as we discuss below, resolution of this preliminary issue ultimately requires us to reverse the district court’s order.
Because a dismissal for claim-splitting is premised on the district court’s ability to manage its own docket by dismissing du-plicative cases, we ordinarily review such a dismissal for abuse of discretion.
See Hartsel Springs Ranch of Colo., Inc. v. Bluegreen Corp.,
296 F.3d 982, 985 (10th Cir. 2002). But the threshold legal question of whether the claim-splitting rule applies at all is one we review de novo.
See Kanciper v. Suffolk Cty. Soc’y for the Prevention of Cruelty to Animals, Inc.,
722 F.3d 88, 91 (2d Cir. 2013).
As the district court noted, we have held that “[t]he rule against claim-splitting requires a plaintiff to assert all of its causes of action arising from a common set of facts in one lawsuit.”
Katz v. Gerardi,
655 F.3d 1212, 1217 (10th Cir. 2011). “[T]he claim-splitting rule exists to allow district courts to manage their docket and dispense with duplicative litigation.”
Id.
at 1218-19. For example, a district court may apply the rule against claim-splitting when a party files two identical—or nearly identical—complaints to get around a procedural rule.
See Hartsel Springs,
296 F.3d at 990 (recognizing general rule that “plaintiff may ‘not use the tactic of filing two substantially identical complaints to expand the procedural rights he would have otherwise enjoyed’ ” (quoting
Walton v. Eaton Corp.,
563 F.2d 66, 71 (3d Cir. 1977))).
Citing
Katz
and
Hartsel Springs,
the district court concluded that Wyles couldn’t evade the state court’s denial of his motion to amend by filing a substantially similar complaint in federal court that contained the very claim the state court refused to let Wyles add, via amendment, to his state complaint. But both
Katz
and
Hartsel Springs
concerned the plain
tiffs’ attempts to concurrently maintain substantially similar lawsuits in
federal
court.
See Katz,
655 F.3d at 1214;
Hartsel Springs,
296 F.3d at 984-85. And although the district court and the parties appeared to assume that the claim-splitting rule applies equally to attempts to maintain identical actions in state and federal court, case law indicates otherwise.
Admittedly,
Katz
employed broad language in requiring a plaintiff to bring all factually-related claims in one lawsuit.
See
655 F.3d at 1217 (stating “rule against claim-splitting requires a plaintiff to assert all of its causes of action arising from a common set of facts in one lawsuit”). But the general rule is that a pending state-court action “is no bar to proceedings concerning the same matter in the Federal court having jurisdiction.”
Sprint Commc’ns, Inc. v. Jacobs,
— U.S. -, 134 S.Ct. 584, 588, 187 L.Ed.2d 505 (2013) (quoting
Colo. River Water Conservation Dist. v. United States,
424 U.S. 800, 817, 96 S.Ct. 1236, 47 L.Ed.2d 483 (1976)).
Consistent with that rule, we’ve previously commented upon simultaneous jurisdiction of factually-related suits in federal and state courts.
See Carter v. City of Emporia,
815 F.2d 617, 621 (10th Cir. 1987) (noting plaintiff “may freely split a cause of action between federal and state courts and pursue both actions,” though noting the risk of' claim preclusion).
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ORDER AND JUDGMENT
Nancy L. Moritz, Circuit Judge
Terrence Wyles filed a complaint in state court asserting multiple claims against multiple defendants. While the state proceeding was pending, Wyles filed a complaint in federal court asserting nearly identical claims against nearly all of the same defendants. Concluding that Wyles improperly split his claims between state and federal court, the district court dismissed Wyles’ federal complaint. Because the district court erroneously concluded that Wyles’ pending state-court action precluded his parallel federal-court action, we vacate and remand for further proceedings.
Background
In March 2014, Terrence Wyles filed a complaint in Arapahoe County District Court in Colorado against 15 defendants, including his former employers, Aluminaid International, A.G. and West Hills Research & Development; several of their officers; the law firm of Loeb & Loeb, LLP; and a partner in that firm—Allen Sussman. The complaint contained nine claims that arose from Wyles’ former employment as in-house counsel for Alumi-naid and West Hills. In October 2014, Wyles filed a motion to amend the complaint, seeking to add a claim of professional malpractice against Sussman and Loeb
&
Loeb, LLP (collectively, the Loeb defendants). In January 2015, the state court denied the motion.
Six weeks later, Wyles filed this federal lawsuit. Wyles’ federal complaint is substantially similar to his state complaint except that Wyles added both a negligence claim against the Loeb defendants and a misrepresentation claim against other defendants, and also omitted two defendants who were named in the state complaint. The new negligence claim mirrored the malpractice claim that Wyles unsuccessfully sought to add in state court.
The Loeb defendants
moved to dismiss the federal complaint. In June 2015, the
district court granted the motion and in doing so, noted that Wyles could have raised all of his claims in state court. Applying the rule against claim-splitting, the district court reasoned that Wyles can’t “file two substantially identical complaints in order to evade procedural restrictions.” App. 240. Wyles appeals.
Discussion
Wyles argues the district court erred in dismissing his complaint based on the rule against claim-splitting. First, he contends that the rule only allows dismissal when the challenged state and federal actions are identical and—because his state and federal actions weren’t identical—the district court erred in dismissing his federal action based on claim-splitting. Alternatively, he contends the rule requires a plaintiff to bring all claims in one court and that he complied with the rule by bringing all of his claims in federal court after the state court denied his motion to add the malpractice claim against the Loeb defendants. The Loeb defendants, on the other hand, urge us to affirm based, on the district court’s claim-splitting rationale. But neither party addresses whether the rule against claim-splitting applies to du-plicative complaints filed in state and federal court versus duplicative complaints filed in federal courts. And as we discuss below, resolution of this preliminary issue ultimately requires us to reverse the district court’s order.
Because a dismissal for claim-splitting is premised on the district court’s ability to manage its own docket by dismissing du-plicative cases, we ordinarily review such a dismissal for abuse of discretion.
See Hartsel Springs Ranch of Colo., Inc. v. Bluegreen Corp.,
296 F.3d 982, 985 (10th Cir. 2002). But the threshold legal question of whether the claim-splitting rule applies at all is one we review de novo.
See Kanciper v. Suffolk Cty. Soc’y for the Prevention of Cruelty to Animals, Inc.,
722 F.3d 88, 91 (2d Cir. 2013).
As the district court noted, we have held that “[t]he rule against claim-splitting requires a plaintiff to assert all of its causes of action arising from a common set of facts in one lawsuit.”
Katz v. Gerardi,
655 F.3d 1212, 1217 (10th Cir. 2011). “[T]he claim-splitting rule exists to allow district courts to manage their docket and dispense with duplicative litigation.”
Id.
at 1218-19. For example, a district court may apply the rule against claim-splitting when a party files two identical—or nearly identical—complaints to get around a procedural rule.
See Hartsel Springs,
296 F.3d at 990 (recognizing general rule that “plaintiff may ‘not use the tactic of filing two substantially identical complaints to expand the procedural rights he would have otherwise enjoyed’ ” (quoting
Walton v. Eaton Corp.,
563 F.2d 66, 71 (3d Cir. 1977))).
Citing
Katz
and
Hartsel Springs,
the district court concluded that Wyles couldn’t evade the state court’s denial of his motion to amend by filing a substantially similar complaint in federal court that contained the very claim the state court refused to let Wyles add, via amendment, to his state complaint. But both
Katz
and
Hartsel Springs
concerned the plain
tiffs’ attempts to concurrently maintain substantially similar lawsuits in
federal
court.
See Katz,
655 F.3d at 1214;
Hartsel Springs,
296 F.3d at 984-85. And although the district court and the parties appeared to assume that the claim-splitting rule applies equally to attempts to maintain identical actions in state and federal court, case law indicates otherwise.
Admittedly,
Katz
employed broad language in requiring a plaintiff to bring all factually-related claims in one lawsuit.
See
655 F.3d at 1217 (stating “rule against claim-splitting requires a plaintiff to assert all of its causes of action arising from a common set of facts in one lawsuit”). But the general rule is that a pending state-court action “is no bar to proceedings concerning the same matter in the Federal court having jurisdiction.”
Sprint Commc’ns, Inc. v. Jacobs,
— U.S. -, 134 S.Ct. 584, 588, 187 L.Ed.2d 505 (2013) (quoting
Colo. River Water Conservation Dist. v. United States,
424 U.S. 800, 817, 96 S.Ct. 1236, 47 L.Ed.2d 483 (1976)).
Consistent with that rule, we’ve previously commented upon simultaneous jurisdiction of factually-related suits in federal and state courts.
See Carter v. City of Emporia,
815 F.2d 617, 621 (10th Cir. 1987) (noting plaintiff “may freely split a cause of action between federal and state courts and pursue both actions,” though noting the risk of' claim preclusion). Though we permit dismissal of a federal suit under exceptional circumstances, we’ve warned against dismissing a federal suit solely because a similar suit was pending in state court.
See, e.g., D.A. Osguthorpe Family P’ship v. ASC Utah, Inc.,
705 F.3d 1223, 1233 (10th Cir. 2013) (“And, to be sure, a federal court will not and should not shy away from contemporaneously exercising concurrent jurisdiction with a state court in the ordinary course of things.”);
Fox v. Maulding,
16 F.3d 1079, 1082 (10th Cir. 1994) (noting that pending state-court action doesn’t preclude parallel federal-court action).
In contrast, a federal court generally will avoid duplicative litigation within the federal court system.
See Colorado River,
424 U.S. at 817, 96 S.Ct. 1236 (“As between federal district courts, however, though no precise rule has evolved, the general principle is to avoid duplicative litigation.”). Enforcing the claim-splitting rule is one way a federal court avoids duplicative federal litigation.
See, e.g., Katz,
655 F.3d at 1217 (describing claim-splitting as maintaining “two actions on the same subject in the same court, against the same defendant at the same time” (quoting
Curtis v. Citibank, N.A.,
226 F.3d 133, 139 (2d Cir. 2000)));
Hartsel Springs,
296 F.3d at 985 (noting that dismissal for claim-splitting is proper when duplicative action is “already pending in another federal court” (quoting
Serlin v. Arthur Andersen & Co.,
3 F.3d 221, 223 (7th Cir. 1993))). As our Supreme Court explained in
Colorado River,
“This difference in general approach between state-federal concurrent jurisdiction and wholly federal concurrent jurisdiction stems from the virtually unflagging obligation of the federal courts to exercise the jurisdiction given them.” 424 U.S. at 817, 96 S.Ct. 1236.
Here, Wyles first filed suit in state court and later filed a nearly identical suit in federal court. In dismissing the federal complaint under the rule against claim-splitting, the district court faulted Wyles for filing the federal complaint in what the district court saw as an effort to evade an unfavorable procedural ruling in state court. But such an evasive tactic is improper only when both complaints are filed in federal court.
See Walton,
563 F.2d at 71 (explaining that when consolidating two federal actions, court must ensure plaintiff didn’t file duplicative complaint to circumvent rules pertaining to amending complaint). And a federal court with jurisdiction isn’t barred from hearing a suit concerning the same matter as a suit pending in state court.
See Colorado River,
424 U.S. at 817, 96 S.Ct. 1236. Accordingly, the district court erred in dismissing Wyles’ federal complaint under the rule against claim-splitting.
Alternatively, the Loeb defendants argue that the
Colorado River
doctrine supports dismissal.
See D.A. Osguthorpe Family P’ship,
705 F.3d at 1233-84, 1233 n.13 (describing the
Colorado River
doctrine as “a judicially crafted doctrine of efficiency’ that applies in cases involving concurrent federal or federal and state jurisdiction and that permits federal courts to dismiss certain cases to avoid piecemeal litigation and conserve judicial resources).
Because the district court declined to address the Loeb defendants’ argument that it should dismiss this suit in deference to the state court under
Colorado River,
we decline to consider this theory for the first time on appeal.
See Moses H. Cone Mem’l Hosp. v. Mercury Constr. Corp.,
460 U.S. 1, 19, 103 S.Ct. 927, 74 L.Ed.2d 765 (1983) (noting generally that “the decision whether to defer to the state courts is necessarily left to the discretion of the district court in the first instance”);
Fox,
16 F.3d at 1082 (‘We decline to determine in the first instance whether deference to the state court proceedings is warranted, for to do so would overstep the bounds of our review for abuse of discretion and enter the realm of de novo review.”). If the Loeb defendants pursue this theory on remand, the district court may consider it at that time.
For these reasons, we vacate the district court’s dismissal order and remand for further proceedings.