Hello CarlosMCatedra,
We see that you're running into an issue with Yahoo Finance loading correctly on your Mac. We'd like to offer you the help you need. Have you had a chance to Clear your browsing history in Safari on Mac?
Also, if you have not tried already, restart the Mac. Does this help to resolve the issue? Often this simple step will refresh the apps and software on the device to solve numerous problems you may encounter.
Does the issue happen when you're on a different browser (or on a different device) that's connected to the same network?
We hope these ideas help to resolve your issue.
Best regards!