Stock Price Impact of Cyberattacks

Cyberattacks hit valuation hard, with studies showing 1–7% drops. Breach impact varies by industry, data sensitivity, and response.

Recently, an executive at a publicly traded company asked me a simple but important question:

“Is there a straightforward way to estimate how much a cyberattack could affect a company’s stock price?”

At first, I shared what we already know:

Target (2013): −10%
Equifax (2017): −35%
MGM Resorts (2023): −18%
CrowdStrike (2024): −11.1% in a single day

But the more…