David Simpson, non-executive director of Ecofin Water & Power Opportunities, has acquired 25,000 shares, celebrating a decent set of half year results published last week. Simpson spent 154p on each of the shares, giving the deal a total trade value of £38,500.For the six months ended March 31st, the group's net asset per share totaled 191.20p, up 10.2% on the prior half year period ended September 30th. Looking ahead, it said the pace of global economic activity is strengthening and should continue to improve this year and in 2015, driven largely by recovery, albeit uneven, in the developed economies. It also noted that investor sentiment toward the utility sector had improved in many markets in recent months.Top Director BuysEcofin Water & Power Opportunities (ECWO) Director name: Mr David Simpson Amount purchased: 25,000 @ 154.00p Value: £38,500Orosur Mining Inc (OMI) Director name: Mr Ignacio SalazarAmount purchased: 150,000 @ 13.20p Value: £19,800