Swiss stocks historical prices have an error
All the historical prices for Swiss stocks (within the SMI index at least) are incomplete, they always show the last trading day price but then there's a gap all the way to the 12th June 2018 (not sure why this date) and then it's complete all the way to 2017. The gap gets bigger every day as the 12th June seems to be the last historical price always before the last intraday... Hope this can be solved as i download this data on a regular basis in my analysis of stocks to invest and i'm stuck with these stocks from Switzerland.

Thanks for your post, Aslam!
We would like to take a look into this issue further and fix it! Can you please contact one of our Yahoo Finance specialists here: https://io.help.yahoo.com/contact/index?page=home&locale=en_US&y=PROD_FIN and provide specific examples and screenshots so we can review.
Regards,
Yahoo Finance Support