This is a very good suggestion. I guess I should rename the current column to "initial launch date" and right next to it, add another column labeled as "changed ownership?". Under this new column, the link to the details/date of the change in ownership may be added.
What do you think about this solution?
It's a good suggestion but my worry is whether it's possible to gather all that information about all the exchanges in the list

Maybe, You could just make additional notes below with links of details of exchanges that have changed ownership (i believe it's just a few of them that are very old and have changed owners) otherwise the table is going to be super large with more columns and it will be hard to follow up a row while scrolling across when one is trying to read through info about a specific exchange.
Hehe, well, if I put all the details in a single column, it'll obviously ruin the alignment of the whole table. However, what I meant was a "link" to the details of the ownership change. That link may lead to a post/thread/web-article/etc.
Under this new column, the link to the details/date of the change in ownership may be added.
I guess I should've been clearer with my words.
