All or none

All or none (AON) is a finance term used in investment banking or securities transactions that refers to "an order to buy or sell a stock that must be executed in its entirety, or not executed at all".[1] Partial execution is not acceptable; the order will execute "only if there are enough shares available in a single transaction to cover it".

This article is about the finance term. For the physiological principle, see All-or-none law.

An all-or-none clause in an underwriting contract or investment prospectus gives a securities issuer the right to cancel an issue in its entirety if the underwriting is not fully subscribed.[2]

AON orders are similar to fill or kill (FOK) orders, but the former focuses on "complete vs. partial fulfillment", whereas the latter hinges on the immediacy of the transaction.[3]

Example

If you place an AON order requesting 100 shares of JKL Co. at $2, your stockbroker will not fill that order unless they can obtain the entire 100 shares at $2; if JKL Co. shares are in such high demand that there are only 50 shares available for purchase, then you must wait until the entirety of your order, 100 shares, is available for purchase.[4]

Disadvantages

Price inflation is the main disadvantage of AON orders.[5]

Continuing with the previous example, let's say that three months later, your broker informs you that all 100 shares of JKL Co. are now available for purchase, but the stock price doubled from $2 to $4. Since you did not cancel this AON order, you are then forced to buy all the 100 shares of JKL Co. at double the price you intended. Using a limit order in conjunction with the AON order will prevent this from happening.

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See also

References
  1. "All-Or-None Order". Answers. U.S. Securities and Exchange Commission. Retrieved 22 March 2013.
  2. "What is All-Or-None Order?". Black's Law Dictionary, Free Online Legal Dictionary, 2nd Ed. Retrieved 22 March 2013.
  3. "Extreme Orders for Everyday Investors". Scottrade Knowledge Center. May 2009. Retrieved 22 March 2013.
  4. "All or None (AON) Orders". Trading – Orders. Interactive Brokers. Retrieved 22 March 2013.
  5. Mendoza, Alex (20 July 2012). "The End of an Era – Say Goodbye to All-Or-None Orders". CBOE Communities. Archived from the original on 3 March 2013.


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