- Aptic is a trade in a financial instrument executed at a higher price than the previous trade.
- Since 2001, the minimum tick size for stocks trading above $1 is 1 cent.
- The growth rule, originally in effect from 1938 to 2007, dictated that a short sale could only be made on an increase.
- In 2010, a new alternative rule was introduced to tell short sellers to only trade on the upside if the security has already dropped 10% on the day.
- A down tick is when the price of a security is down at least 1 cent from the previous trade.