Related Link: Best And Worst ETFs Of The Week Amid Greek Relief Deal United States Natural Gas Fund (NYSE: UNG ) Natural gas prices experienced the same deflationary spiral as crude oil last year, but have been finding strength in recent weeks as cold weather sinks in to the Northeast. UNG tracks the daily spot price of natural gas futures, which are traded on the NYMEX exchange. Traders should take note that UNG is nearing its 50-day moving average and has started to decouple from the weakness in crude oil futures, as well.