Who Really Owns the World's Seeds? What the Data, Courts and Critics Say About Bayer, Corteva, Syngenta and BASF

Four companies, one patent system, and a billion-dollar aid experiment. Here is what the sources actually report.

By Muntazir Mahdi, Founder of ANFA Technology.

Let me start with three numbers.

56%. That is the share of the global commercial seed market that Bayer, Syngenta, Corteva and BASF now control, according to the Canadian Biotechnology Action Network.

95%. A USDA marketing report estimated that this share of corn intellectual property, and 84% of soybean IP, is held by BASF, Bayer, Corteva and Syngenta.

$63 billion. That is what Bayer paid for Monsanto in 2018.

Each number comes from a different source, and together they describe who holds the starting point of the food chain.

In this post I stick to what government data, court records, investigative reporters and critics have published. My own view comes in the last section.

01. Four Companies, Built by Mergers

The current structure is recent. Dow and DuPont merged and created Corteva, ChemChina bought Syngenta, and SinoChem later merged with ChemChina to form the Syngenta Group. BASF, which had no major seed business of its own, bought seed and pesticide assets that regulators forced Bayer to sell to win approval for the Monsanto deal.

The sources give slightly different numbers.

• Bayer: CBAN says it holds 23% of the seed market and 15% of the agrochemical market after buying Monsanto.
• Corteva: CBAN puts it at 19% of seeds and 10% of agrochemicals.
• Syngenta: CBAN says it owns about one quarter of the global agrochemical market.
• Farm Action's version: a US advocacy group puts the top four at 51% of global seeds, with Bayer at 23%, Corteva at 17%, ChemChina at 7% and BASF at 4%.

The gap between 51% and 56% comes from how each group measures the market, so read the figures as approximate.

02. What the US Government's Own Data Shows

The most useful sources here are not activists. They are USDA researchers.

The Economic Research Service (ERS)

• Four firms (Bayer, Corteva, ChemChina's Syngenta Group, and BASF) control the majority of crop seed and agricultural chemical sales.
• In 2015 it took six firms to hold that position.
• The agency traces the concentration to the expansion of intellectual property rights for seed improvements in the 1970s and 1980s.
• Corteva and Bayer alone supplied more than half of US retail seed sales of corn, soybeans and cotton in 2018–20.

Corn and soybeans

• AgReliant, Bayer, Corteva and Syngenta together accounted for 83.4% of US corn seed sales and 78.1% of soybean seed sales from 2018 to 2020.
• More than 200 seed companies have been acquired or gone out of business since the first genetically engineered traits arrived in the early 1990s.
• Independent seed companies say their costs for licensing genetics and traits rise every year while they compete against the firms selling them.

The antitrust threshold

Fortune notes that economists typically treat a 40% combined share for a sector's top four firms as the point where market distortions start, and 60% as the threshold that draws heightened antitrust scrutiny.

03. What the Sources Say About Patents, Lawsuits and Bundling

Lawsuits over saved seed

• In 2023, Bayer sued four Missouri farmers for allegedly saving seeds and replanting them the following year, which the user agreement forbids.
• The same year, Corteva sued a competitor it accused of stealing its seeds, making slight genetic modifications and seeking US patents.
• The Center for Food Safety documented Monsanto's use of litigation against farmers in a 2005 report.
• In 2013, the US Supreme Court ruled against an Indiana farmer who replanted patented soybeans in Bowman v. Monsanto.

Bundling seed and chemicals

• Farm Action argues the big four use patent control, tying, bundling and exclusive dealing to shut out smaller competitors.
• Fortune reports that the same four firms sell both the seeds farmers plant and the pesticides those seeds are bred to work with, and that Monsanto's then-CEO framed the mergers around selling seeds, chemicals and data as a single package.
• The Missouri Independent describes dicamba as an example. Monsanto and BASF sold the herbicide together with dicamba-resistant soybeans, and the herbicide drifted onto neighbours' non-resistant crops.

The legal bill

Bayer has agreed to pay more than $12 billion to settle tens of thousands of US lawsuits tied to Roundup. Those cases concern herbicide safety rather than seed control, but they are part of the company's record.

04. The Gates Foundation, AGRA and What the Reviews Found

The Gates Foundation appears in this story because of AGRA, not because of any seed company.

• The Gates and Rockefeller foundations launched the Alliance for a Green Revolution in Africa in 2006, with a promise to double productivity and incomes for 30 million smallholder households by 2020 and cut food insecurity by half.
• Critics say that after fifteen years and a billion dollars in funding, the promise was not fulfilled.
• A report by African and German civil society groups found maize production rose 87 per cent, but most of that came from farmers planting more land. Yields rose only 29 per cent over 12 years.
• An independent evaluation by the consulting firm Mathematica, funded by the Gates Foundation on behalf of AGRA's lead donors, found no evidence of progress toward the food security goals.
• The Rosa Luxemburg Foundation's follow-up alleges that AGRA exerts political influence on fertilizer and seed legislation in partner countries in favour of agribusiness.
• The critics also cite local cases. In a Tanzanian project, farmers could only join if they avoided mixed cropping, and in a Rwandan project, farmers were fined for not planting approved crops.

AGRA's response is on record. It called the 2020 report a "flawed analysis" but, according to US Right to Know, did not provide data to refute it. Keep in mind that the Rosa Luxemburg Foundation and US Right to Know are advocacy organizations, so their framing is one-sided even where the facts hold. The Mathematica review is the least partisan source in this section.

05. What the Sources Do Not Say

None of the sources above claims that these companies intend to destroy farming or control the world's food on purpose. The reporting is about market share, patents, contracts and lawsuits. Bayer, Corteva and Syngenta did not return requests for comment on the USDA's seed-industry framework when the Missouri Independent asked. I have not found a detailed company response to these criticisms, and I will add one if it appears.

06. The Verdict

The seed industry is more concentrated than most people know, and the evidence for that comes largely from the US government, not from campaigners. Four firms hold most of the patents, sell most of the seed, and sell the chemicals that go with it. Some of them sue farmers who replant.

I don't see evidence of a plan to end farming. I do see a system where a country's food supply can depend on decisions made in a foreign boardroom. That risk is real even if nobody intends it, and it matters most for countries that import seed and cannot switch suppliers quickly.

The Gates Foundation story is a different problem. A 15-year, billion-dollar program that its own funders' evaluation could not credit with progress is a failure of accountability. It is not a plot. The foundation answers to no voters, and the people it claimed to serve had little say in the design.

Technology is not the enemy. Better seed raises yields, and companies argue that patents pay for the research. But the gap between that argument and a market where independent breeders are disappearing deserves more scrutiny than it gets. Farmers should keep the right to save and swap seed. Public breeding programs should stay funded. Aid programs should be judged on what happens to farmers' incomes, not on what the press release promised.

Frequently Asked Questions

Who controls the world's seed supply?

Four companies, Bayer, Corteva, Syngenta and BASF, control the majority of global seed sales. Estimates run from 51% to 56% depending on the source.

Are "terminator seeds" being sold to farmers?

No. Genetic use restriction technology was developed in the late 1990s but has never been commercialized, and the UN Convention on Biological Diversity has held a moratorium on it since 2000.

Can farmers replant patented seed?

Generally not. Patented seed comes with contracts that forbid saving and replanting, and courts have enforced them.

Did AGRA meet its goals?

Independent and critical reviews say no. A Gates-funded Mathematica evaluation found no evidence of progress toward the food security goals. AGRA disputes the harsher critiques.

Is anyone claiming these companies want to destroy farming?

Not in the sources reviewed here. The documented concern is market concentration and dependence, not intent.

Where can I read the original reports?

The USDA Economic Research Service and Agricultural Marketing Service reports are the best starting points.

About the Author & AI Future Insights

This piece was authored by Muntazir Mahdi, founder of ANFA Technology. AI Future Insights covers AI, automation, and frontier tech for readers who prioritize signal over hype, designed, built, and maintained by a Karachi-based software engineering team.

Methodology & Sourcing

Market share and concentration data come from the USDA Economic Research Service, the USDA Agricultural Marketing Service (as reported by DTN Progressive Farmer and Seed World), the Canadian Biotechnology Action Network, and Farm Action. Lawsuit and bundling reporting draws on the Missouri Independent and Fortune. AGRA findings come from the False Promises report as covered by The Elephant and Table Debates, the Rosa Luxemburg Foundation, US Right to Know, and the Mathematica evaluation. Market share figures differ between sources because of different methodologies. Advocacy sources are identified as such in the text.