Can I long and short simultaneously ?

Is it technically possible to buy to enter then sell to enter without first having to sell to exit?

 

What asset class and why would you want to when a boxed position can require margin. overnight fees and can't produce P/L?

 

on different expiring contracts, or different accounts.

 

No, it's not possible

 

This. Also using highly correlated but different securities.

 

Right, that's what I thought, thanks.

 

does your broker allow hedging?

 

I'm referring to stocks, not options or derivatives.
@mervyn answered the question. I was expecting that answer... 2 accounts, one for long trades and the other for shorts...

 

Does your country provide a tax advantage for this? Why not just close the equity position when you want to be flat?

 

Let say I buy to enter but the momentum reverses. My options are to hold and wait for the shares to reverse long or sell to exit and take a loss. I was wondering if there was a way to sell to enter with new shares while maintaining my existing long position....but clearly that's not possible and first need to close my position, take the loss, then short.