Stack Overflow primarily makes money with Ads, Job Posting, Enterprise Service and Affiliate Links. They make a lot of money with the job posting option. Ads also make it millions every year. I can’t give you any accurate figures because they are a private company.
At the time of writing, the number of monthly unique visitors it had is: 1,331,479,752. And the daily unique visitors is: 55,478,323. That’s a lot of traffic. My estimate is that they make 1–10 million every month in ad revenue alone. Yearly, they might make 50–300 million in ads.
All amazon affiliate links in stack overflow are automatically changed to their own link. This generates a small portion of their revenue.
They rent the stack overflow software to large companies which makes them huge money. In total, their yearly revenue should be over 100 million dollars.
This answer was written in July 2020. The revenue may change in the future when you are reading this. Repost from Quora.
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