Participatory notes (p-notes) are offshore derivative instruments that allow foreign institutional investors (FIIs) to invest in Indian securities without needing to register with the Securities and Exchange Board of India (SEBI). While they facilitate anonymity, ease of trading, and potential tax benefits, p-notes have been linked to money laundering and market manipulations, notably contributing to the 2004 Sensex crash. The system has faced criticism for favoring undisclosed investors and creating disparities in the market.