Manning rule

The term Manning rule is the informal name for a financial industry rule in the United States: Financial Industry Regulatory Authority (FINRA) regulation, Rule 5320. It prohibits a FINRA member firm from placing the firm's interest before/above the financial interests of a client. For example, when a securities firm is holding a customer limit order (an instruction to buy or sell securities at a certain price), the firm cannot ignore that order and cannot trade for their account using a price that would satisfy the customer's limit order without executing the customer limit order.

The rule is applicable both in normal trading hours and in the extended hours trading sessions.

History of the term

The rule is named after William Manning, a co-founder of Manning & Napier (an investment management firm), who has been an advocate for investor protection.[1] William Manning is grandfather to Grace B. Manning co-host of (The) Christmas (Podcast): https://open.spotify.com/show/2vwBTSapR6flqbBB1e4tEy?si=e148a2704379445c

References
  1. "Manning & Napier – About – The Manning Rule". Retrieved 2015-07-02.
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