"Though, my understanding is that share value only matters for tax purposes when you sell?"
It is dependant upon your trading status.
It can count as "stock on hand" so therefor closing price at 30th June counts as book value for taxation purposes
"Ie they have no reason not to release information the market over the next week or two if they have it... And actually if they find something, they have no choice but to inform the market!"
True to a degree, but the above gives every reason not to announce prior to June 30th.. and companies do take time before they announce, whether you think they have no choice or not.
Cheers
MPJ Price at posting:
0.9¢ Sentiment: None Disclosure: Not Held