Securities and Futures Act (Cap. 289): Primary legislation governing securities, trading, and financial markets in Singapore. Crucial for establishing the legal framework for pledging securities and shares.

Companies Act (Cap. 50): Key legislation governing corporate entities in Singapore, particularly Section 131 regarding registration of charges and security interests over company shares.

Civil Law Act (Cap. 43): Fundamental legislation governing civil law matters including contract formation and enforcement in Singapore.

MAS Regulations: Regulatory requirements set by the Monetary Authority of Singapore affecting securities transactions and pledges.

SGX Listing Rules: Singapore Exchange regulations that may apply when listed securities are involved in the pledge agreement.

Central Depository System Rules: Rules governing the deposit, custody, and transfer of securities through Singapore's CDP system.

Securities and Futures (Clearing Facilities) Regulations: Regulations governing clearing and settlement of securities transactions, including pledged securities.

Corporate Authorization Requirements: Internal corporate governance requirements for valid execution of pledge agreements, including board approvals and shareholder resolutions if needed.

Foreign Ownership Restrictions: Regulations limiting foreign ownership of certain types of shares or industries that may affect pledge arrangements.

Competition Law: Regulations regarding market competition that may be relevant when pledging shares that could affect market control or concentration.

Tax Regulations: Tax implications and stamp duty considerations for share pledge transactions in Singapore.

Cross-border Regulations: International laws and regulations that may apply when the pledge agreement involves foreign entities or cross-border elements.