Wall Street threw a party on Wednesday after Democrats took control of Congress. The Dow Jones Industrial Average jumped more than 3%, the S&P 500 rose 1.8%, and the Nasdaq Composite gained about 1.8%. The Vanguard Total Stock Market ETF (VTI) climbed roughly 1.7%, and the State Street SPDR S&P 500 ETF Trust (SPY) rode the same wave.
The logic is familiar: divided government means fewer sweeping policy changes, which means less uncertainty. Investors like boring gridlock. But if you looked under the hood of Wednesday's rally, the picture got a lot less tidy.
Apple, Microsoft and Amazon Did the Heavy Lifting
The biggest contributors to the advance were some of the largest companies on the planet. Apple (AAPL) surged approximately 6% to a record high. Microsoft (MSFT) climbed around 6%. Amazon (AMZN) advanced about 7%, giving large-cap equity exposure a serious boost.
Then there was the other side of the ledger. Nvidia (NVDA), VTI's largest holding, fell about 1.5%. Tesla (TSLA), another major position, declined more than 2%.
That divergence matters more than it might seem. VTI tracks nearly the entire U.S. stock market, which sounds like the definition of diversification. But it is still heavily influenced by its largest constituents. According to Yahoo Finance data, its top 10 holdings account for approximately 35% of the portfolio. SPY has similar mega-cap technology exposure, because the S&P 500 benchmark is dominated by America's largest publicly traded businesses. So both ETFs are getting a lift from Apple, Microsoft and Amazon while absorbing blows from weakness in semiconductor stocks.
The Catch: A Rally With Uneven Participation
Semiconductor and AI infrastructure stocks were the sore spot Wednesday, and the reason is political. Investors are weighing the possibility that Democratic control of Congress could bring greater scrutiny of AI development and data center construction. Democrats made significant gains in key data-center states, including Texas, raising concerns about tighter local regulations and potential delays to infrastructure projects.
The selling was sharp. The Philadelphia Semiconductor Index fell more than 4% at one point, while some data-center operators suffered much steeper losses. That creates a mixed backdrop for VTI and SPY, both of which hold meaningful exposure to companies tied to the AI investment cycle.
In other words, the same election result that sent Apple to a record high also put pressure on the companies building the plumbing for artificial intelligence. Investors are rewarding select mega-cap technology names while reassessing the outlook for semiconductors and AI infrastructure.
VTI or SPY: What Should Investors Watch?
The key question now is whether the post-election rally broadens beyond mega-cap technology stocks. If gains stay concentrated among the largest companies, SPY's S&P 500 exposure could remain advantageous. If smaller companies and other market segments start participating more meaningfully, VTI could benefit from its broader market coverage.
For now, Wednesday's trading suggests a market that is cheering political gridlock while quietly repricing the AI trade underneath. The index numbers look broad. The action inside them, at least on this day, did not.
