Iowa Code
Iowa Code § 553.4 (2026)
Restraint prohibited
✓ current as of July 2026
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A contract, combination, or conspiracy between two or more persons shall not restrain or monopolize trade or commerce in a relevant market. [C97, §5060, 5061; S13, §5067-a; C24, 27, 31, 35, 39, §9906, 9907, 9915; C46, 50, 54, 58, 62, 66, 71, 73, 75, §553.1, 553.2, 553.10; C77, 79, 81, §553.4]\n\nTue Dec 09 22:01:36 2025 Iowa Code 2026, Chapter 553 (18, 0) §553.5, IOWA COMPETITION LAW 2
\nNotes of Decisions
Cited in 37
cases (1 in the last 5 years), 1979–2026 · leading case: Comes v. Microsoft Corp., 646 N.W.2d 440 (Iowa 2002).
Comes v. Microsoft Corp., 646 N.W.2d 440 (Iowa 2002). “See Iowa Code §§ 553.4 , 553.5 (1997). On appeal, the consumers urge us to find our state antitrust law is not controlled by federal law, and thereby allow them to sue in Iowa as indirect purchasers.”
Steven A. Mueller, Bradley J. Brown, Mark A. Kruse, Kevin D. Miller, & Larry E. Phipps, on Behalf of Themselves & Those Like Situated v. Wellmark, Inc. D/B/A Wellmark Blue Cross & Blue Shield of Iowa, an Iowa Corp. & Wellmark Health Plan of Iowa, Inc., an Iowa Corp., 818 N.W.2d 244 (Iowa 2012). “Count III pleads Wellmark entered into a contract, combination, or conspiracy to unlawfully restrain trade against chiropractors in violation of section 553.4 of the Iowa Competition Law.”
Amended June 5, 2015 Steven A. Mueller, Bradley J. Brown, Mark A. Kruse, Kevin D. Miller, & Larry E. Phipps, on Behalf of Themselves & Those Like Situated v. Wellmark, Inc. D/B/A Wellmark Blue Cross & Blue Shield of Iowa, an Iowa Corp., & Wellmark Health Plan of Iowa, Inc., an Iowa Corp., 861 N.W.2d 563 (Iowa 2015). “As the plaintiffs stated, Plaintiffs hereby agree and stipulate that the only violation of Iowa Code § 553.4 alleged in the Fourth Amended and Substituted Petition for Damages is for a contract, combination or conspiracy between the Defendants and (1) out-of-state Blues and (2)…”
Bradley A. Chicoine, Dr. Bradley A. Chicoine, D.C., P.C., Mark A. Niles, Niles Chiropractic, Inc., Rod R. Rebarcak, & Ben Winecoff, on Behalf of Themselves & Those Like Situated v. Wellmark, Inc. D/B/A Wellmark Blue Cross A, 894 N.W.2d 454 (Iowa 2017). “1 The petition alleges Wellmark entered a combination or conspiracy with potential competitors—the other BCBS affiliates and self-funded employee plans Wellmark administers—to restrain trade, commerce, and competition in the sale and purchase of healthcare services in Iowa.”
Revere Transducers, Inc. v. Deere & Co., 595 N.W.2d 751 (Iowa 1999). “Iowa Code section 553.4 states in part, "[a] contract, combination, or conspiracy between two or more persons shall not restrain or monopolize trade or commerce in a relevant market.”
State v. Cedar Rapids Bd. of Realtors, 300 N.W.2d 127 (Iowa 1981). “Turner, on behalf of the State, filed a petition alleging defendant Cedar Rapids Board of Realtors (Board) denied nonmembers access to its multiple listing service and thereby unreasonably restrained trade in violation of the Iowa Competition Law, section 553.4, The Code 1977.…”
Comes v. Microsoft Corp., 709 N.W.2d 114 (Iowa 2006). “See Iowa Code §§ 553.4 , 553.5 (1997). This is the third time this case has journeyed into this court.”
Bell v. Hershey Co., 557 F.3d 953 (8th Cir. 2009). “The suit alleged that the manufacturers violated the Iowa Competition Law, Iowa Code Ann. §§ 553.4 and 553.5 (West 1997), by conspiring to “(a) fix, raise, maintain, and stabilize the price of chocolate; and (b) caused Named Plaintiff and other members of the Class to pay higher…”
DOUBLE D SPOTTING Serv., INC., Plaintiff-Appellant, v. SUPERVALU, INC.; World Super Servs., Inc., Defendants-Appellees, 136 F.3d 554 (8th Cir. 1998). “Double D filed an amended and substituted complaint in federal district court, alleging in counts I through IV that the defendants contracted to restrain trade in violation of Iowa Code § 553.4 (1997) and Section 1 of the Sherman Antitrust Act, 15 U.”
Comes v. Microsoft Corp., 696 N.W.2d 318 (Iowa 2005). “This suit was brought against Microsoft Corporation for violating the provisions of the Iowa competition law, Iowa Code §§ 553.4 , 553.5 (1997). The plaintiffs, on behalf of themselves and the classes they seek to represent, claim that Microsoft engaged in monopolistic practices…”
Southard v. Visa U.S.A. Inc., 734 N.W.2d 192 (Iowa 2007). “See Iowa Code §§ 553.4 , .5. They claim they and others in the class were injured by the defendants’ illegal conduct because all consumers paid merchants artificially inflated prices for all merchandise.”
Wellmark, Inc. D/B/A Wellmark Blue Cross & Blue Shield of Iowa, an Iowa Corp., & Wellmark Health Plan of Iowa, Inc., an Iowa Corp. v. Iowa Dist. Court for Polk Cnty., 890 N.W.2d 636 (Iowa 2017). “They stipulated accordingly, Pursuant to discussions with the Court and Defendants’ counsel during the telephone hearing held on February 22, 2013, on Defendant’s Motion to Dismiss or Stay and Defendants’ Supplement to Motion to Dismiss, Plaintiffs hereby agree and stipulate…”
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