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No. 10348644
United States Court of Appeals for the Ninth Circuit
Real Estate Exchange Inc v. Zillow Group, Inc.
No. 10348644 · Decided March 3, 2025
No. 10348644·Ninth Circuit · 2025·
FlawFinder last updated this page Apr. 2, 2026
Case Details
Court
United States Court of Appeals for the Ninth Circuit
Decided
March 3, 2025
Citation
No. 10348644
Disposition
See opinion text.
Full Opinion
FILED
NOT FOR PUBLICATION
MAR 3 2025
UNITED STATES COURT OF APPEALS MOLLY C. DWYER, CLERK
U.S. COURT OF APPEALS
FOR THE NINTH CIRCUIT
REAL ESTATE EXCHANGE INC, a No. 24-685
Delaware corporation,
D.C. No.
Plaintiff - Appellant, 2:21-cv-00312-TSZ
v.
MEMORANDUM*
ZILLOW GROUP, INC., a Washington
corporation; NATIONAL ASSOCIATION
OF REALTORS,
Defendants - Appellees.
Appeal from the United States District Court1
for the Western District of Washington
Thomas S. Zilly, District Judge, Presiding
Argued and Submitted February 13, 2025
Honolulu, Hawaii
Before: S.R. THOMAS, BRESS, and DE ALBA, Circuit Judges.
Real Estate Exchange (“REX”) appeals the district court’s grant of summary
judgment to the National Association of Realtors (“NAR”) and Zillow Group, Inc.1
*
This disposition is not appropriate for publication and is not precedent
except as provided by Ninth Circuit Rule 36-3.
1
REX also sued subsidiaries of Zillow Group, Inc. including Zillow, Inc.,
Zillow Homes, Inc., Zillow Listing Services, Inc., and Trulia, LLC. These entities
are collectively referred to as “Zillow” here.
(“Zillow”) on antitrust claims under Section 1 of the Sherman Act, 15 U.S.C. § 1,
and a parallel provision of the Washington Consumer Protection Act, Wash Rev.
Code § 19.86.030. REX also appeals the district court’s denial of REX’s motion
for a new trial on REX’s deceptive act or practice claim under Wash. Rev. Code §
19.86.020. We have jurisdiction pursuant to 28 U.S.C. § 1291, and we affirm.
Because the parties are familiar with the factual and procedural history of the case,
we need not recount it here.
I
The district court correctly concluded that there was no Sherman Act
agreement between NAR and Zillow based on the no-commingling rule.2 The
existence of an agreement, or “concerted action,” is an essential element of a claim
under Section 1 of the Sherman Act. Fisher v. City of Berkeley, 475 U.S. 260, 266-
67 (1986) (stating “there can be no liability under § 1 in the absence of
agreement”). Concerted action consists of “a conscious commitment to a common
scheme designed to achieve an unlawful objective.” PLS.Com, LLC v. Nat’l Ass’n
2
We analyze REX’s antitrust claim under Washington state law under the
federal standard because the relevant section of the Washington Consumer
Protection Act mirrors the Sherman Act. See State v. Black, 676 P.2d 963, 967
(Wash. 1984) (en banc) (stating that Wash. Rev. Code § 19.86.030 “is our State's
equivalent of section 1 of the Sherman Antitrust Act” and that “[w]hen the
Legislature enacted the Consumer Protection Act, it anticipated that [Washington]
courts would be guided by the interpretation given by federal courts to their
corresponding federal statutes”).
2
of Realtors, 32 F.4th 824, 842 (9th Cir. 2022) (quoting Monsanto Co. v. Spray-Rite
Serv. Corp., 465 U.S. 752, 764 (1984)). To survive summary judgment, a plaintiff
must provide direct or circumstantial evidence of concerted action. See Toscano v.
Pro. Golfers Ass’n, 258 F.3d 978, 983 (9th Cir. 2001). REX did not do so here.
First, as the district court found, the no-commingling rule itself is not direct
evidence of concerted action that “joins together separate decisionmakers.” Am.
Needle, Inc. v. Nat’l Football League, 560 U.S. 183, 195 (2010). Each NAR-
affiliated multiple listing service (“MLS”) independently chose whether to adopt
the rule, and indeed twenty-nine percent of them did not. The rule was in fact
optional and does not establish a Section 1 agreement by itself.
Second, Zillow independently re-designed its website to comply with the
rule. Zillow’s choice to change its website to display listings on two separate
tabs—with REX’s listings on the non-default tab—is the source of REX’s alleged
anti-competitive harm. REX has not provided either direct or circumstantial
evidence demonstrating that NAR agreed to this website design, or that Zillow did
anything more than “merely accept[]” and comply with the optional no-
commingling rule promulgated by NAR and adopted by some MLSs. Toscano,
258 F.3d at 983-84 (finding no agreement where local sponsors of golf
tournaments “merely accepted” rules that were “independently set” by the PGA
3
Tour). Nor did the no-commingling rule itself direct how Zillow or others should
separately display listings from MLS and non-MLS sources. Thus, REX cannot
prove that Zillow and NAR committed to a common, anti-competitive scheme and
the district court correctly granted summary judgment. See Cnty. of Tuolumne v.
Sonora Cmty. Hosp., 236 F.3d 1148, 1155 (9th Cir. 2001) (finding “[p]laintiffs
[could not] survive summary judgment because they [had] presented neither direct
nor circumstantial evidence” of concerted action).
II
The district court also correctly found that REX forfeited any claim of
conspiracy between Zillow and non-party MLSs that did not include NAR. REX
never made a concrete allegation of a separate conspiracy involving Zillow and
individual MLSs. In its Amended Complaint, REX referred repeatedly to the
“NAR/MLS regime” or “NAR/MLS cartel.” REX also alleged a nationwide
conspiracy “[b]ecause Zillow’s universal display change concealing non-MLS
listings is implemented nationally” and did not limit its allegations to only those
jurisdictions where an MLS had adopted the no-commingling rule. Any
conspiracy between Zillow and MLSs alone was not clearly raised before the
district court and accordingly need not be considered on appeal. In re Mortg. Elec.
4
Registration Sys., Inc., 754 F.3d 772, 780 (9th Cir. 2014) (“Generally, arguments
not raised in the district court will not be considered for the first time on appeal.”).
III
Finally, the district court did not err in instructing the jury on Zillow’s
reasonable business practice defense to REX’s deceptive act or practice claim
under the Washington Consumer Protection Act. “Jury instructions must be
supported by the evidence, fairly and adequately cover the issues presented,
correctly state the law, and not be misleading.” Peralta v. Dillard, 744 F.3d 1076,
1082 (9th Cir. 2014).
Here, Zillow presented sufficient evidence to warrant the instruction. As the
district court noted in its denial of REX’s motion for a new trial, Zillow provided
evidence at trial that it designed its two-tab display thinking REX’s listings would
not be included on either tab after Zillow switched to IDX feeds. Later, at REX’s
request, Zillow accommodated REX by including its listings on the “Other
listings” tab. Id. The district court correctly noted that “[t]he jury could have
viewed this last-minute decision as being in the best interests of both REX and
Zillow and therefore reasonable.” Zillow was thus entitled to receive a jury
instruction on its reasonable business practice defense. See Travis v. Wash. Horse
Breeders Ass’n, Inc., 759 P.2d 418, 423-24 (Wash. 1988) (en banc) (defendant was
5
entitled to an instruction on the reasonable business practice defense, where the
defendant presented evidence that its deceptive practice was customary in the
trade).
The given instruction also correctly stated the law. The language was
derived from the Washington Consumer Protection Act, Wash. Rev. Code §
19.86.920, and mirrored the language of Washington Pattern Jury Instruction
310.02. 6A Wash. Prac., Wash. Pattern Jury Instr. Civ. WPI 310.02 (7th ed. 2022).
Additionally, in Travis, the Washington Supreme Court held that an instruction
substantially similar to the one given by the district court “correctly states the law.”
759 P.2d at 424. REX asserts the instruction was nonetheless misleading because
the jury might conclude that Zillow’s switch to receiving listings data through IDX
feeds was reasonable, not its website re-design. But the language of the instruction
makes clear that Zillow’s deceptive “act or practice” is what must be reasonable,
and accordingly the court did not err in refusing to clarify the instruction any
further.3
3
REX also asserts the instruction should not have been given because the
public interest outweighed any potential business justification. REX did not
preserve this objection below, so it is reviewed only for plain error. Fed. R. Civ. P.
51(d)(2). None of the cases REX cites support its contention that the trial court
must weigh the public interest before instructing a jury on the reasonableness
defense. Instead, “[t]he ‘reasonableness defense’ is appropriately submitted as a
jury question if there are material issues of fact about its application.” Stephens v.
Omni Ins. Co., 159 P.3d 10, 20-21 (Wash. Ct. App. 2007). The district court
6
AFFIRMED.
committed no error, let alone plain error, in giving the instruction.
7
Plain English Summary
FILED NOT FOR PUBLICATION MAR 3 2025 UNITED STATES COURT OF APPEALS MOLLY C.
Key Points
01FILED NOT FOR PUBLICATION MAR 3 2025 UNITED STATES COURT OF APPEALS MOLLY C.
02COURT OF APPEALS FOR THE NINTH CIRCUIT REAL ESTATE EXCHANGE INC, a No.
03MEMORANDUM* ZILLOW GROUP, INC., a Washington corporation; NATIONAL ASSOCIATION OF REALTORS, Defendants - Appellees.
04Zilly, District Judge, Presiding Argued and Submitted February 13, 2025 Honolulu, Hawaii Before: S.R.
Frequently Asked Questions
FILED NOT FOR PUBLICATION MAR 3 2025 UNITED STATES COURT OF APPEALS MOLLY C.
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This case was decided on March 3, 2025.
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