That MarketWatch game is a ghost town now. MarketWatch held official fantasy earnnings reports trading competitions and promoted the heck out of it when they first launched their platform years back...it was fun then, had a hell of alot of people playing and even some MarketWatch writers too. The last game MW officially held was like in 2012, I believe. Now, it's just open to a bunch of empty games for people to create on their own.
ForceRank, from the guy behind Estimize, looks promising. DraftKings for stocks. http://forcerank.it/
http://www.battlefin.com/ www.fundseeder.com http://www.collective2.com Very seriously considering entering the 2016 World Cup Futures competition by May/June but am hesitant to expose trade data. The above sites also expose trade data.
careful with battlefin, they dont mention it on the site, but in order to get any benefit, you need to be subscribing to their 1500USD per month service.