Ruralco have been operating in the space for a long time and are backed by a large balance sheet ($315m mc listed coy) with a strong focus on water - see recent acquisition spree. Largest network of water brokers in Australia.
Waterfind aren't small, as mentioned and have a highly regarded live trading platform. Then you've got GMW. Here's a list of all the separate entities:
There's a few platforms out there atm for trading but like grain broking, you'll find the barriers to entry are very low and anyone with a bit of capital can get in the game.
Be interesting to see how they go and I hope they do go well, as not enough small agri stocks for investors on the ASX.
I still find it strange the CN isn't filled. Independent of any promotion, would have expected insiders to have inhaled a small sum like that quick smart, if it's a no brainer listing.
