In this study, we have examined the institution of pledging and seizing negotiable instruments, an important topic at the intersection of commercial law, civil law, and enforcement law. After defining the concept of negotiable instruments and their constituent elements, we provided general information about pledge law. We discussed how negotiable instruments can be pledged, addressing each type specifically. We explained the procedure for converting pledged negotiable instruments into cash, subject to the provisions of movable property pledges. We determined how the pledging of negotiable instruments can take place outside of public/open auctions managed by official bodies, particularly noting that if the relevant negotiable instrument has a fair market value on the stock exchange or in the market (e.g., a bill of lading), it can be subject to sale through negotiation. We also discussed special methods of converting negotiable instruments into cash, which may occur outside of the ordinary methods of conversion, including the transfer of the instrument to a private third party other than the official (enforcement officer) at auction, or the relinquishment of possession and ownership of the instrument to the creditor. Finally, we touched upon the institution of seizure of negotiable instruments. In our study, we took care to conduct our examination within the framework of comparative law.