I find the Auth0 acquisition to be more impressive. Many people (even non-tech) know about Citrix because of Windows. Almost no one outside of tech (and many people inside tech too) knows anything about auth0. Yet, we have a company that was acquired for 6.5 billions of dollars.
It also points to the Okta investor presentations and call transcripts, which are fascinating. The latest one has this tidbit: "It's like there's a customer identity cloud, and that's Auth0, and there's a workforce
identity cloud, which is both for employees and for your extended workforce, partners and suppliers and things that are kind of workforce
like, and those are the platforms in the product suites we go to market with."
The combined market cap of the S&P 500 is 30.5 trillion. The companies everyone knows about probably account for about ~10T. The remaining 20T represents a long tail of unknown companies worth a few 10s of billions.