EU regulators’ investigations into the low tax arrangements of Apple (AAPL.O), Starbucks (SBUX.O) and Amazon (AMZN.O) in some member states are at an advanced stage and decisions could be announced in the coming months, a senior European Commission official said on Thursday. The investigations centre on Luxembourg’s tax rulings for online retailer Amazon and carmaker Fiat Chrysler (FCHA.MI), as well as coffee chain Starbucks’ deal with the Netherlands and iPhone maker Apple’s Irish arrangements, and whether the companies are paying a fair share of tax.