RE: ATY vs ATYTI believe you are using outdated exchange rates. At a price of $6.61 Cdn, converted to US $ at the current rate of 1.4731 you get a US $ price of $4.487. I believe that ATYT closed at $4.49 on Friday. The various markets are very efficient at maintaining currency translations so it is highly unlikely that you will find much more than a penny difference once something is translated between currency's.
The reason Friday's gain for the day seems out of wack comparing the 2 is because the Cdn dollar had a nice rise on Friday so that means in Cdn funds ATY's opening value would no longer be $6.48 ($4.36 US at 1.4841 Thur rate) but $6.42 ($4.36 US at 1.4731 Fri rate). It's gain would now be $0.19 Cdn for the day ($6.61 - 6.42 Cdn) or $0.13 US ($0.19 Cdn converted at the rate of 1.4731).
Clear as mud?
Cheers.