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Uniform Commercial Code (UCC): Primary framework governing secured transactions, particularly Article 8 (Investment Securities) and Article 9 (Secured Transactions), which are crucial for perfection and enforcement of security interests in shares

Securities Laws: Federal regulations including Securities Act of 1933, Securities Exchange Act of 1934, and state 'Blue Sky' Laws, particularly relevant for pledges involving shares of public companies

Federal Reserve Regulations: Includes Regulation U (for margin stock) and Regulation T (for broker-dealer involvement), governing the use of securities as collateral

Corporate Laws: State-specific corporate laws, particularly Delaware General Corporation Law for Delaware-incorporated companies, governing corporate structure and share transfers

Bankruptcy Code: Federal law governing bankruptcy proceedings and its implications on pledged shares and security interests during bankruptcy

Internal Revenue Code: Federal tax regulations governing the tax implications of share pledges and any subsequent transfers of shares under the pledge agreement

State Security Interest Laws: State-specific requirements for perfection and enforcement of security interests in shares, complementing federal regulations

Bank Holding Company Act: Federal legislation particularly relevant when the pledge involves shares of banks or financial institutions

Stock Exchange Rules: Requirements and restrictions imposed by relevant stock exchanges for pledges involving listed securities

Company Governance Documents: Internal company documents including bylaws and shareholder agreements that may affect or restrict share pledges

Antitrust Regulations: Federal and state competition laws that may be relevant if the pledge arrangement could lead to control or concentration issues