I posted this on another less popular thread about the topic; Equifax stock was down about 14% overnight from yesterday to this morning but held pretty steady today...

"This is not financial advise:

I remember a few commentors on HN recently saying they have made large gains by buying stock of companies after the news of cyber security breaches significantly reduced the share value, then waiting for the dust to settle(reaction-news-cycle to complete) and price to return to similar value after a few months."

Hopefully this time will be different, but I doubt it.