Who sells derivatives?

Who exactly sells derivatives? Are they primarily financial institutions, such as banks and brokerage firms? Or could it also include hedge funds, investment banks, and other players in the financial market? Do retail investors have the ability to sell derivatives directly, or do they typically engage through intermediary parties? Is there a specific regulatory framework that governs who can sell derivatives and under what conditions? Additionally, are there any restrictions or qualifications that individuals or entities need to meet in order to engage in the sale of derivatives? Understanding the parties involved in selling derivatives is crucial for gaining a comprehensive view of this financial instrument.