In particular, officers, director and senior staff have to file a form with the SEC in order to trade shares at all. Those trades are subsequently reported to the public in SEC Form 4 [2]. From the SEC [3]:
"Examples of insider trading cases that have been brought by the SEC are cases against:
- Corporate officers, directors, and employees who traded the corporation's securities after learning of significant, confidential corporate developments;
- Friends, business associates, family members, and other "tippees" of such officers, directors, and employees, who traded the securities after receiving such information;
-Employees of law, banking, brokerage and printing firms who were given such information to provide services to the corporation whose securities they traded;
- Government employees who learned of such information because of their employment by the government;
- and Other persons who misappropriated, and took advantage of, confidential information from their employers."
[1] https://www.sec.gov/answers/insider.htm
[2] http://www.nasdaq.com/symbol/tsla/insider-trades
[3] http://ir.tesla.com/secfiling.cfm?filingID=1494730-16-7&CIK=...
https://en.wikipedia.org/wiki/Google_Lunar_X_Prize
My bet would actually be on SpaceIL or Astrobotics to win the prize. Astrobotics has been the consistent winner when it comes to demonstrating intermediate goals; they won the prizes for Landing, Mobility, and Imaging, and seem to have a solid engineering effort based out of CMU with partnerships with major U.S. corporations. SpaceIL has some interesting design choices that limit risk, eg. they're launching on a SpaceX Falcon 9 and they aren't building a rover, instead lifting off via rocket and flying to a second destination 500M away.
Moon Express has two major risk factors against it: they're launching on an Electron, which is a rocket that has never successfully flown before and won't be commercially available until 2017, and their founder has a reputation for making grandiose promises and then running away with the money. (He founded InfoSpace during the dot-com boom, sold all of his stock at the peak even while revenues were declining, then was ordered to pay $247M in insider-trading fines by the SEC.)