You can't withdraw your tender but... You can't withdraw your tender because the agreement is binding, your broker is an agent to faciltate the sale of your shares under the condition that Brooksfield secured enough shared to be tendered, which in this case, they have. Your other choice is to sell the shares in your account prior to the tender transaction going through, in this event, you will be actually be shorting the stock at the market price, and will need to repurchase the shares from the market on the day the tender transaction goes through (this is usually settled within a couple of days). There is therefore no net gain, and if anything, you risk being charged unncessary brokerage fees.