Workday isn't 75% of the ATS market. I checked 337 companies.
Founder, ResumeAI
Kayvan is the founder and lead engineer of ResumeAI. He writes the product and the code, and recently open-sourced the State of ATS 2026 dataset that maps the Applicant Tracking System used by 743 large employers.
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Throughout my job search, I've seen a variety of things, with 3000+ applications. Workday isn't 75% of the ATS market. I checked 337 companies.
If you have read about applicant tracking systems, there's the claim: Workday runs hiring, and a few vendors own the market.
An earlier version of my own dataset put Workday at 75.4% of large employers, with the top three vendors at 93.5%. However, I went and looked at the actual companies, and Workday is around 41%.
Why my number was wrong
The first version of that dataset wasn't really researched. I had an LLM compile it from public info and I didn't check the companies one by one. When I finally went back and verified each employer against its real careers page, I noticed that about half the rows were wrong.
When the model didn't know what a company used, it said "Workday." Why? Because Workday is the most common answer.
As a result, I threw the guesses out and checked them properly.
You can check any company yourself
Click Apply on a careers page and watch where it sends you. For instance,
I did this for 337 of the 743 companies in the dataset and:
I think it's important because each of these parses a resume a little differently. They weight keywords differently, they mess up on different things, so the same resume will perform differently.
337 of 743 are verified. I'm working through them, but a smaller honest number than a big wrong one is more helpful than not.
If it's useful: a free checker scores your resume against whatever ATS a given company runs, and the verified data is open if you want to pull it apart yourself. Thanks.