WAAAX

There are 5 Aussie companies that are the equivalent to the USA's FAANG.  Today, I added ALU (31.67) and APX (22.05) to one portfolio, after watching their price fall in line with the market.  All WAAAX share prices are overpriced.  Am I making the right decision?  I don't consider it to be gambling to lose because their progress has been good.

I also topped up on JIN but it went down!  Likewise, AZY went down too.  But nothing drastic.