If someone accidentally sell stocks for wrong price, is possible reverse the trade ?

[kotika]

This 1 centers used to happen a lot

Things are different now. Your brokerage is supposed to detect and reject such orders. For a fact, IB does.
But few years back, I entered a buy order in pre-market and instead of 14.66 entered 17.66 - NASDAQ did NOT agree to bust it - because they said it was within 10% of previous close. I havent tried but I think this order would be rejected now.

 

[GotherL]

What happens if someone sell 1 million Google Stocks for 1 cent ?

I just made a post that kinda relates to that. It has happened before in the japanese stock market. The employee responsible got fired and the company lost a ton of money. (Don't recall how much.)

https://www.elitetrader.com/et/threads/aggressive-order-type-error.345242/

In the past, a handful of lucky traders have gotten extremely rich overnight by fat finger errors.

 

[newwurldmn]

Things are different now. Your brokerage is supposed to detect and reject such orders. For a fact, IB does.
But few years back, I entered a buy order in pre-market and instead of 14.66 entered 17.66 - NASDAQ did NOT agree to bust it - because they said it was within 10% of previous close. I havent tried but I think this order would be rejected now.

I believe there are no protections in the pre and post market.

 

[sprstpd]

I believe there are no protections in the pre and post market.

There are protections but it is based on how far off the price was and there are time deadlines for a bust request. Each exchange has different rules.