This research aims to normatively examine the position of Notaries in conducting Legal Due Diligence (LDD) within corporate acquisition transactions, as well as the legal protection afforded to buyers under the Law on Notary Positions (UUJN) and the Law on Limited Liability Companies (UUPT). The research method employed is normative legal research, utilizing both statutory and conceptual approaches. The results conclude that Notaries hold a strategic position as guarantors of legal certainty in corporate transactions, where the obligation to perform LDD manifests the principle of due diligence as mandated by Article 16 of the UUJN. Legal protection for buyers is preventive in nature, positioning the Notary as responsible for ensuring the material validity of the object of the acquisition before it is finalized in an authentic deed. Any failure by the Notary to perform the verification function in accordance with statutory standards may cause losses to good-faith buyers. Based on the Utility Theory, Notarial compliance with LDD procedures is an absolute prerequisite for achieving legal security for business actors. It is recommended that technical regulations regarding Notarial LDD protocols be established and that legal administration systems be further integrated to optimize public protection.