Bayer faces antitrust lawsuit over GMO corn seed market practices
Synopsis
The Bayer antitrust lawsuit alleges the company maintained excessive control over the U.S. GMO corn seed market after patents tied to its NK603 trait expired. The case raises questions about licensing practices, royalties and competition in a sector that supplies seed technology used across most American corn farms.
Bayer faces a federal antitrust lawsuit alleging anti-competitive conduct in the U.S. GMO corn seed market. The case centers on NK603 trait licensing and royalty practices after patent expiration.
Key Highlights
- Bayer faces antitrust claims over competition in the U.S. GMO corn seed market.
- Lawsuit focuses on the NK603 trait after patent protections expired in 2022.
- Genetically engineered seeds account for more than 90% of U.S. corn acreage.
- Bayer's Corn Seed & Traits business generated about €7.15 billion in 2025 revenue.
Bayer is being sued in the United States for antitrust violations that could bring a renewed focus on competition in the global seed industry, one of the most concentrated in modern agriculture.
In a lawsuit filed in Iowa, Latham Quality Seed has claimed that Bayer is illegally monopolizing the market for genetically modified corn seeds through practices related to its NK603 trait. The lawsuit in federal court states that Bayer maintained its market power even after its patent on the trait was invalidated in 2022.
Focus turns to seed licensing
Bayer's complaint alleges that they raised licensing charges, demanded royalties and stifled work on alternative development of other traits associated with the glyphosate-tolerant NK603 trait.
Those actions drove down competition and hampered independent seed companies, says Latham. The company is asking for class action and damages in U.S. antitrust laws.
Bayer has rejected the claims and stated that the corn seed market is competitive.
Debate over competition in agriculture
The lawsuit comes on the heels of competition probes by regulators in some of the world's major agricultural economies in the seed, chemical and farm-input sectors.
More than 90 percent of corn planted across the nation is genetically engineered, according to the U.S. Department of Agriculture. The licensing of herbicide-tolerant traits is an important component in the agricultural supply chain, with approximately 92% of corn acreage planted with such traits.
Since the 2018 Bayer-Monsanto merger which transformed the global crop protection and seed business, industry concentration has been a point of interest. The transaction went through multiple rounds of competition regulatory approvals and is subject to conditions.
The current case brings the management of patented agricultural technologies to the fore as IP rights expire.
A key business for Bayer
It's one of Bayer's biggest agricultural enterprises involved in the dispute.
Bayer's Crop Science division made €21.6 billion in revenue last year, according to its 2025 Annual Report. Corn Seed & Traits was one of the top product categories in the division, with a contribution of €7.15 billion.
The total amount of sales of the group in 2025 amounted to €45.6 billion.
The case comes on the heels of a series of lawsuits against Bayer, but this one is about competition in the corn seed business and not product safety concerns that have been the focus of prior litigation.
FAQs
Q1. Why is Bayer facing a lawsuit over GMO corn seeds?
A seed company alleges Bayer used licensing and royalty practices to maintain dominance in the GMO corn seed market after key patents expired.
Q2. What is the NK603 corn trait at the center of the case?
NK603 is a genetically modified corn trait that allows crops to tolerate glyphosate-based herbicides used for weed control.
Q3. Could the lawsuit affect the seed industry?
The case could increase scrutiny of how major agricultural companies license seed technologies and manage competition after patents expire.
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Pooja Malik is a business journalist with over six years of experience covering startups, entrepreneurship, and emerging trends. She has previously worked with leading media platforms such as YourStory Media and BW BusinessWorld, where she reported on business, policy, and market developments. Currently, she serves as Editor at The Inspirepreneur Magazine, where she writes and edits stories across business, lifestyle, and travel, with a focus on clarity, accuracy, and reader relevance.
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