A while back I worked out the cash pile at about 60 cents a share, maybe its a little more now. Not worth getting to wound up about when you quantify it down on a per share basis.
Best way to compare valuations of growth companies (because they will all be growing earnings at different rates) is to look at the PEG ratio.
Forward Price earnings / eps growth rate. In ATM's case the PEG ratio based on today's updated forecast is 31 / 18 = 1.72
More on PEG ratio's here
https://www.investopedia.com/terms/p/pegratio.asp
The other day I posted an example of a stock growing underlying earnings on average at 15% per annum, on a PEG ratio of 0.70 (MET, who I think are very cheap)
SUM are currently on a PEG of about 1.0 and have a long and highly credible track record of consistently growing underlying earnings very quickly.
HGH another company trading on a forward PE of just 12.2, (basically a no growth rate for the current risk free Govt stock rate) so you're getting growth for nothing as well as an 8.8% gross yield.
Plenty of other better value growth stocks on the NZX, just quoted you 3 obvious ones.
All of these shares are
vastly better value growth stocks than ATM in my opinion.