A target window for an announcement by mid-2027 gives the merger speculation a timeline. That is likely to keep Tesla shares sensitive to any headlines from the special committees, and SpaceX shares sensitive to swings in AI sentiment, since its stock would be the deal currency. A sustained selloff in chip and AI stocks is the key market risk to the deal: it would weaken SpaceX’s valuation leverage and the investor enthusiasm needed for a transaction of this size. The midterm elections on November 3 add a political variable, as a Democratic win in either chamber could bring closer scrutiny of Musk’s businesses. For broader markets, a combination on this scale would intensify focus on AI-related capital spending and cash burn, at a time when investors are already questioning when that investment will pay off.---Earlier:JPMorgan doubles SpaceX target to $500 on AI growth, maps out possible Tesla merger---Musk has said he wants SpaceX and Tesla together, and now the race is on to get the biggest deal in corporate history done while the White House is friendly and investors are still believers.Summary:There is a push to announce a SpaceX-Tesla merger by the first half of 2027 so it can close during the Trump administration, Bloomberg (gated) reported, citing people familiar with the matterA combination would bring together companies worth around $3.7 trillion, the largest corporate transaction ever attemptedMusk called the deal a good idea but said he would recuse himself, leaving special committees to work through terms, which have not been settledMusk controls more than 80% of SpaceX’s voting power but owns about 20% of Tesla, making Tesla shareholder approval the tougher hurdleRisks to the timeline include the midterm elections and a possible sustained selloff in chip and AI stocksJPMorgan flagged tension between SpaceX’s national security contracts and Tesla’s large China manufacturing footprint for regulatory and shareholder approvalElon Musk’s backers are racing to secure a merger of SpaceX and Tesla while political and market conditions remain favourable, with a push to announce a deal by the first half of 2027 so it can close during President Donald Trump’s administration, Bloomberg reported, citing people familiar with the matter.The combination would bring together companies with a combined market value of around $3.7 trillion, making it the largest corporate transaction ever attempted. Musk gave his strongest public endorsement yet on SpaceX’s earnings call this week, describing a combination as a good idea. He said he would recuse himself and leave special committees at both companies to work through the details, cautioned that winning over Tesla shareholders could be difficult, and said no terms had been agreed. SpaceX and Tesla did not respond to Bloomberg’s requests for comment on the timing.According to the report, timing will depend on when Tesla’s board is comfortable with the details. Shareholder approval is less of an obstacle at SpaceX, where Musk controls more than 80% of the voting power. At Tesla, where he owns about 20% of the stock, it will be harder. However, the board and shareholders approved a trillion-dollar pay package for him less than a year ago.Two risks are shaping the timeline. The US midterm elections are less than two weeks away, and Democratic control of either chamber of Congress could open Musk and his companies to investigations while weakening a president nearing lame-duck status. A sustained selloff in chipmaker and AI stocks could also erode the investor support needed for the deal. SpaceX shares have recovered strongly after falling below their $135 IPO price following the June listing, rising 47% since August 5. Analysts say that makes SpaceX’s stock an attractive currency for a deal, though a fall in its price could complicate terms.The companies already have business ties, most notably their joint Terafab semiconductor plant in Texas, and have been laying groundwork for closer cooperation, with AI as a common thread. Both are expected to burn billions of dollars a quarter for the foreseeable future, a sharp shift for Tesla, whose car business has generated steady cash in recent years.JPMorgan said in a research note that the national security sensitivities around SpaceX’s US defence contracts, and Tesla’s large China manufacturing base, are key dynamics at odds with each other in winning regulatory and shareholder approval. In a separate note this week, the bank suggested any deal would likely be an all-stock transaction led by SpaceX. This article was written by Eamonn Sheridan at investinglive.com.