You could consider cutting your loss
why on earth would I do that ! …t'would be a dummies play to sell now
There is no actual loss, just a valuation hiccup...they will recover in time and in the Interim will move heaven and earth to prop up the dividend stream ( and the share price)
The financial news isn't in yet, but it's not a valuation hiccup.
There is both (1) brand damage and (2) financial costs to both remediate the security damage to customers, plus to improve data security with (3) exposure to increased government regulation and potential fines.
None of the financial impacts of the above are yet known but they are >0, so this will cause volatility as people make their own assessments. These all have financial impacts though on both p/l and balance sheet, not just valuation.