Prediction markets now assign a 66% probability to a merger between Tesla and SpaceX by the end of 2027, up from 52% a day earlier and 46% a week ago. The move followed a report from a credible source saying a merger is more likely than not within that period. The January 1, 2028 sub-market recorded a 20-point increase to 66%, while the September 30 market priced only a 2.4% chance of an announcement and the December 31 market remained at 18.5%. Elon Musk, CEO of both Tesla and SpaceX, is central to the speculation. Official statements, regulatory filings, earnings calls or verified comments from Musk or either company could alter the market’s assessment, while a denial or clarification could reduce current expectations.