Workday isn't 75% of the ATS market. I checked 713 companies.

Throughout my job search, I've seen a variety of things, with 3000+ applications. Workday isn't 75% of the ATS market. I checked 713 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 39%.

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,

myworkdayjobs.com is Workday

boards.greenhouse.io is Greenhouse

jobs.lever.co is Lever

icims.com is iCIMS

oraclecloud.com (look for /hcmUI/) is Oracle

successfactors.com is SAP SuccessFactors

jobs.ashbyhq.com is Ashby

I did this for 713 of the 743 companies in the dataset and:

Workday, 39%. Still the biggest and still the one most worth knowing.

Greenhouse, 13%. The default in venture-backed tech.

SAP SuccessFactors, 8%.

Oracle Cloud HCM, 6%, plus Taleo (the old Oracle system) another 5.5%. Banks, hospitals, old-line employers.

Proprietary internal systems, 4%. The Apples and Googles rolling their own.

Then: iCIMS 6%, Eightfold 3.5%, SmartRecruiters 3%, Avature 2.5%, Lever 1.5%, Ashby 1.4%, and a long tail — Phenom, Cornerstone, BrassRing, ADP, UKG, Paradox.

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.

713 of 743 are now verified. Of the 333 companies the first version blindly tagged "Workday," only 137 actually use it — 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.

Related: which companies use Workday (the full verified list) · how to optimize your resume for Workday · what your Workday application status actually means