Tax implications when transferring stock from US to Canada?

I use to live in US and I have some stocks in a US brokerage account. Now I have moved to Canada and want to consolidate all the shares by moving the US stocks to my TD waterhouse US account in Canada. What are the tax implications? I asked the US brokerage company and they said there's no consequence on the US side when I do the transfer, although I find it a bit hard to believe IRS doesn't care when you move stock shares. So when I do eventually sell those shares from my Canadian account, how do I determine the cost basis for those shares?

Just to add. The move actually happened about 2 years ago, so I have been Canadian residence for 2 years now. But I only moved the shares to Canada recently.

As far as the stock brokerage is concerned, you are still the owner of the shares, and thererefore no disposition occurred when u moved to canada.

The key important question is whether u are considered as a cdn resident for tax purposes when u moved here. Did u cut off all your US ties and establish cdn economic ties and social ties here? If so, u are a cdn resident for tax purposes.

As a US citizen, u need to file your annual US tax return. On the day when u moved to cda, the fair mkt value of your US shares (the closing price on the stock exchanges) represent the adjusted cost base for cdn tax purposes to be reported on your cdn tax return when these shares are sold, and the acrrued gains or losses of these shares will be reported on your US tax return.

PS re your additonal details: If u are a cdn resident, u report your world income. However, CRA would only tax u on your gains after u became a cdn resident. Therefore, u need to find out the date that u became cdn resident (which could be the day that u moved here if you uprooted from US) and the stock price on that day as the adjusted cost base for your shares. The fact that you transferred the brokerage account recently to cda is not relevant, as a cdn taxpayer can set up US brokerage account too.