# Autotrading and size changes

**URL:** <https://forums.collective2.com/t/autotrading-and-size-changes/7829>\
**Category:** C2\
**Created:** [January 18, 2015, 8:02pm UTC](https://forums.collective2.com/t/autotrading-and-size-changes/7829 "2015-01-18T20:02:54Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Steve\_sylwester](https://yyz2.discourse-cdn.com/flex028/user_avatar/forums.collective2.com/steve_sylwester/32/238_2.png) [@Steve\_sylwester](https://forums.collective2.com/u/Steve_sylwester)\
**Post date:** [January 18, 2015, 8:02pm UTC](https://forums.collective2.com/t/autotrading-and-size-changes/7829/1 "2015-01-18T20:02:54Z")

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I am autotrade following a strategy via TradeBullet and IB. If i change my sizing allocation, will the closing orders remember the original number of shares i purchased?  
a) if i increase system sizing while a position is open, will autotrade try to close too many shares when the system generates a closing order  
b) if i decrease system sizing, will autotrade under-close the position?

\Thanks

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**Author:** ![FrancisGingras](https://yyz2.discourse-cdn.com/flex028/user_avatar/forums.collective2.com/francisgingras/32/21573_2.png) [@FrancisGingras](https://forums.collective2.com/u/FrancisGingras)\
**Post date:** [January 19, 2015, 10:57pm UTC](https://forums.collective2.com/t/autotrading-and-size-changes/7829/2 "2015-01-19T22:57:58Z")

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Hi,

The setting will apply to orders going forward. Your currently open positions will not change.

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**Author:** ![Steve\_sylwester](https://yyz2.discourse-cdn.com/flex028/user_avatar/forums.collective2.com/steve_sylwester/32/238_2.png) [@Steve\_sylwester](https://forums.collective2.com/u/Steve_sylwester)\
**Post date:** [January 20, 2015, 1:19am UTC](https://forums.collective2.com/t/autotrading-and-size-changes/7829/3 "2015-01-20T01:19:44Z")

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Hi Francis,  
But how will it affect the closing of currently open positions? If i have 80 shares Long open, and then i double my allocation, will autotrade try to close 160 shares? or does it remember I only have 80?  
THis is using Tradebullet / IB.  
Steve

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**Author:** ![FrancisGingras](https://yyz2.discourse-cdn.com/flex028/user_avatar/forums.collective2.com/francisgingras/32/21573_2.png) [@FrancisGingras](https://forums.collective2.com/u/FrancisGingras)\
**Post date:** [January 20, 2015, 1:39am UTC](https://forums.collective2.com/t/autotrading-and-size-changes/7829/4 "2015-01-20T01:39:53Z")

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C2 knows how many shares you filled, and that’s the quantity it will use to close the existing positions.