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Securities market is a component of the wider financial market where securities can be bought and sold between subjects of the economy, on the basis of demand and supply. (Wikipedia)

Financial market transactions include interbank overnight borrowings, bank large value certificates of deposit, government debt securities, enterprise equity and (short and long-term) debt securities, as well as a whole host of futures, options, and other derivative instruments related to money market securities, foreign exchange, and commodities. All transactions in financial markets have to be cleared and settled, just like transactions that occur among enterprises or between enterprises and consumers. (worldbank.org)

In terms of Securities law, financial contract is an arrangement that takes the form of an individually negotiated contract, agreement, or option to buy, sell, lend, swap, or repurchase, or other similar individually negotiated transaction commonly entered into by participants in the financial markets. A financial contract involves securities, commodities, currencies, interest or other rates, or any other financial or economic interest similar in function. (USLegal)

An over-the-counter (OTC) market and an exchange market are the two basic ways of organizing financial markets. (Investopedia)