The shares changed hands while the operating company remained the same.
With a share purchase, the operating company generally remains the same legal entity. Its liabilities do not disappear when its shareholders change. Buying the shares alone does not make the new shareholder personally liable for the company’s debts under sections 38 UGB or 1409 ABGB.
Check the company-register record before and after completion. Any separate basis for liability, such as a personal guarantee or the new operator’s own later breach of duty, requires a separate assessment.