Hi. Hoping someone can shed some light on how to calculate...

Hi. Hoping someone can shed some light on how to calculate shareholding and corresponding ACB for shares as a result of the demerger in 2021. I feel like such a noob for asking, and apologies if this has been covered previously.

Prior to demerger, I held 11,000 shares at adjusted cost base of $9000.

I know I now hold 1100 ISXFEU, as I can see this in atomic.
I have no idea how many shares I hold in unlisted public company SP1 or where I can even find this information.

Is someone able to shed some light on how to calculate how many shares of each I would own, and what the cost basis would be. I know the demerger was 10:1, but this has me for some stupid reason confused.

Finally, what would need to happen to be able to write off my SP1 shares as a tax loss.

Thanks in advance.