OPINION
By interlocutory appeal and mandamus, appellant/relator, Kebret I. Mohamed, challenges an order granting the motion to compel arbitration and abate proceedings of appellees/real parties in interest, Auto Nation USA Corp., Auto Nation, USA, Auto Nation, Inc., Auto Nation, Inc. fik/a Mercedes Benz of Houston-Greenway, and Houston Auto Imports Greenway, Ltd. d/b/a Mercedes Benz of Houston-Green-way (collectively, “the Auto Nation parties”). We determine (1) whether we have jurisdiction over the mandamus proceeding or the interlocutory appeal and (2) whether the trial court abused its discretion in implicitly ruling that the non-signatory Auto Nation parties could enforce the arbitration agreement. We dismiss the interloeu- *833 tory appeal for want of jurisdiction and conditionally grant the petition for writ of mandamus.
Background
In May 1999, Park Place-South hired Mohamed, a United States citizen born and raised in Ethiopia, as a valet for its car-sales business. Mohamed alleges that, shortly after he was hired, his co-workers began severely harassing him because of his race and national origin. Mohamed alleges the harassment continued until he was constructively discharged.
Mohamed signed an alternative dispute resolution agreement (“the arbitration agreement”) with Park Place-South in June 1999. 2 It appears that, some time before Mohamed quit, but after he signed the arbitration agreement, one of the Auto Nation parties purchased Park Place-South. In November 2001, Mohamed sued the Auto Nation parties and two of his supervisors for race discrimination; intentional infliction of emotional distress; and negligent hiring, supervision, and retention. In January 2002, the Auto Nation parties moved to compel arbitration and to dismiss or stay trial-court proceedings. Mohamed contested the agreement’s validity and enforceability. 3 Both parties submitted summary evidence along with their arbitration pleadings. After a non-eviden-tiary hearing, the trial court granted the motion to compel arbitration and abated the cause.
Interlocutory Appeal 4
Mohamed indicates in his brief that he filed both an interlocutory appeal and a mandamus proceeding because the trial court’s order did not state whether it was rendered under the Texas General Arbitration Act (“TAA”) 5 or the Federal Arbitration Act (“FAA”). 6 Mohamed originally argued, however, that jurisdiction lay over the interlocutory appeal because the order compelling arbitration could have been rendered only under the TAA, which he claims authorizes this appeal. The Auto Nation parties moved to dismiss the appeal and for sanctions, arguing no jurisdiction lay over an appeal from an order compelling arbitration under the TAA. During oral argument, Mohamed conceded that his only remedy is mandamus.
We agree with the parties that no interlocutory appeal lies from an order granting a motion to compel arbitration under the TAA.
7
See
Tex. Civ. PRAC. & Rem.Code Ann.
*834
§ 171.098(a)(1), (2) (Vernon Supp.2002) (allowing interlocutory appeal of orders, among others, that
deny
application to compel arbitration or that
grant
application to stay arbitration); Tex. Civ. Prac.
&
Rem.Code ÁNN. § 51.014(a) (Vernon Supp. 2002) (omitting orders granting application to compel arbitration among orders ap-pealable interlocutorily);
Glazer’s Wholesale Distribs., Inc. v. Heineken USA, Inc.,
No. 05-99-01685-CV, slip op. at 8, — S.W.3d —, —,
Only mandamus lies over an order granting a motion to compel arbitration under the TAA.
See Glazer’s Wholesale Distribs.,
No. 05-99-01685-CV, slip op. at 8-9, — S.W.3d at-(considering mandamus proceeding over same because party compelled to arbitrate without allegedly having agreed to do so had no adequate remedy by appeal);
In re Godt,
Accordingly, we grant the Auto Nation parties’ motion to dismiss Mohamed’s interlocutory appeal. However, we deny their request for frivolous-appeal sanctions against Mohamed because (1) although their own arbitration motion argued the FAA applied, that motion alternatively ar
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gued the arbitration agreement was enforceable under the TAA; (2) the trial court’s order did not specify which act applied; and (3) as discussed in footnote seven above, the Texas Supreme Court’s opinion in
Jack B. Anglin Co. v. Tipps
8
contained dictum suggesting that an appeal might he.
See Trico Marine Servs., Inc. v. Stewart & Stevenson Technical Servs.,
Mandamus 9
A. Standard of Review and Law of Arbitration
We review the trial court’s order for abuse of discretion.
Anglin,
“ ‘A party cannot be required to arbitrate unless it has agreed to do so.’ ”
Trico Marine Servs.,
A party seeking to compel arbitration has the initial burden to establish the arbitration agreement’s existence and show that the claims asserted fall within the agreement’s scope.
In re Kellogg Brown & Root,
B. Non-Signatories’ Right to Enforce the Arbitration Agreement 10
Under issue one, Mohamed argues the Auto Nation parties could not enforce the arbitration agreement because they were not signatories to the agreement and did not prove they were in privity with a signatory. 11
*836
The initial burden of the party seeking to compel arbitration-to establish the arbitration agreement’s existence-includes proving the entity seeking to enforce the arbitration agreement was a party to it or had the right to enforce the agreement notwithstanding.
See Pepe Int’l Dev. Co. v. Pub Brewing Co.,
Therefore, an entity that was not a party to the arbitration agreement may not enforce the agreement’s provisions unless that non-signatory entity falls into an exception, recognized under general equitable or contract law, that would allow such enforcement.
See Grigson v. Creative Artists Agency, L.L.C.,
It is undisputed that none of the Auto Nation parties is a signatory to the arbitration agreement or falls under the agreement’s definition of parties. Instead, the Auto Nation parties’ unverified motion to compel alleged that one of the Auto Nation parties purchased, and thus was corporate successor-in-interest to, Mohamed’s former employer, Park Place-South, which actually signed the agreement. Similarly, at oral argument in this Court, the Auto Nation parties asserted that they had assumed all of Park Place-South’s contractual obligations as part of the purchase. However, and despite Mohamed’s disputing their right to enforce the agreement at the hearing below, the Auto Nation parties never met their burden of presenting evidence supporting their corporate-successor
*837
assertion or revealing the terms of any contractual assignments pursuant to that purchase.
12
See Pepe Int’l Dev. Co.,
The Auto Nation parties respond that they may nonetheless enforce the arbitration agreement because they fall under two further exceptions — both based on equitable estoppel — to the rule that a non-signatory cannot enforce an arbitration agreement. We disagree with each of the Auto Nation parties’ contentions.
First, the Auto Nation parties invoke the equitable exception that a non-signatory defendant may enforce an arbitration clause contained in a contract that contains other terms on which the signatory plaintiff must rely to prosecute its claims.
See, e.g., McMillan v. Computer Translation Sys. & Support,
Second, the Auto Nation parties rely on the equitable exception that, when a plaintiff that is a signatory to an arbitration agreement sues both signatory and non-signatory defendants based on substantially interdependent and concerted misconduct by all defendants, the non-signatory defendants may enforce the arbitration agreement against the plaintiff.
See McMillan,
The Auto Nation parties’ argument overlooks that Sullivan and Havard had neither been served nor had appeared in the suit before the trial judge’s ruling.
13
Generally speaking, a trial court has no personal jurisdiction over defendants that have not yet been served, appeared, or otherwise waived service, and they are thus not yet parties to the suit.
See
Tex.R. Crv. P. 124 (generally, no judgment
*838
against defendant unless defendant is served, appears, or waives service);
Dodd v. Twin City Fire Ins. Co.,
Relying on Texas and federal law, the Auto Nation parties respond that a plaintiff cannot dismiss a signatory defendant simply to prevent a non-signatory defendant from enforcing an arbitration agreement under this particular equitable estop-pel theory.
See Grigson,
We hold the Auto Nation parties did not carry their initial burden of showing an arbitration agreement that they could enforce. Accordingly, we hold the trial court abused its discretion in granting their motion to compel arbitration. We sustain this portion of issue one.
Because of our resolution of this portion of issue one, we need not reach Mohamed’s remaining issues, which concerned (1) whether adequate consideration supported the arbitration agreement, (2) whether Mohamed carried his burden of showing the arbitration agreement was unconscionable or that the Civil Practice and Remedies Code barred the agreement’s enforcement, and (3) whether the trial court erred in not holding an evidentiary hearing. 15
Conclusion
We conditionally grant the petition for writ of mandamus, which will issue only if
*839 the trial court does not vacate its March 18, 2002 order granting the Auto Nation parties’ motion to compel arbitration and abating the lawsuit pending arbitration.
We deny the Auto Nation parties’ motion for sanctions in the mandamus proceeding.
Notes
. The arbitration agreement was between Mohamed and “Employer,” which was defined as (1) Park Place Motorcars, Park Place Lexus, Park Place Bodywerks, Park Place Porsche/Audi, or any Park Place Company and (2) any of those companies’ parent company, subsidiary company, affiliate company, directors, officers, employees, or agents. It is undisputed that Mohamed’s employer at the time of the arbitration agreement, Park Place South, fell under the definition of "Employer.”
. Mohamed does not dispute that, if the arbitration agreement is valid and enforceable by the Auto Nation parties, his claims are the type that fall within the agreement’s scope.
. Our cause no. 01-02-00347-CV.
. See Tex Civ. Prac. & Rem.Code Ann. §§ 171.001-.098 (Vemon Supp.2002).
. ' See 9 U.S.C. §§ 1-16 (2001).
. We note that dictum in the Texas Supreme Court’s opinion in
Jack B. Anglin Co. v. Tipps
implies that appellate jurisdiction might lie over an order granting a motion to compel arbitration under the TAA.
See id.,
.
. Our cause no. 01-02-00519-CV.
. The parties' briefs also label this challenge as a "standing” issue. However, as discussed below, the issue is evidentiary, not one of standing.
.The Auto Nation parties claim that Mohamed did not preserve this challenge because it was not raised in writing below. However, Mohamed raised the challenge at the hearing on the motion to compel and thus preserved it. See Tex.R.App. P. 33.1(a).
. We also note that the arbitration agreement defined "Employer,” one of the signatory parties, as a "parent company, subsidiary company, [or] affiliate company” of any of the companies listed in the definition of "Employer.” The Auto Nation parties did not present evidence that they fit into one of these categories, either.
. As stated before, Mohamed asserts this fact in his brief without dispute, and the record does not contradict Mohamed’s claim. See Tex.R.App. P. 38.1(f).
. We distinguish the remaining federal cases on which the Auto Nation parties rely because their records showed an agency, alter-ego, or sister-corporation relationship, between the signatory and non-signatory defendants, that allowed the non-signatories to enforce the arbitration clause under general contract principles.
See Pritzker v. Merrill Lynch, Pierce, Fenner & Smith, Inc.,
. We note that the Auto Nation parties did not claim below and do not claim here that they were entitled to an evidentiary hearing to show they could enforce the arbitration agreement despite being non-signatories. In any event, showing their right to enforce the agreement was their initial burden, to be carried by presenting summary evidence.
See In re Oakwood Mobile Homes, Inc.,
