Mostly just holding them. The ETH that I am not holding are the ones that I use to invest into smaller priced coins and ICOs as well. Using ethereum is the best for trading as compared to bitcoin so most of all of my trading activities are carried out using ethereum. I also pay with ethereum for people who are willing to take it for a particular item or commodity
Same here mostly I also used eth as my holdings and investment for long term and some.in trading. Because I believe that Ethereum is as good as bitcoin for long term investment.