Americans voted yesterday.
And if you’re invested in US stocks, you’ve probably spent the morning wondering one thing: does any of this actually matter for my portfolio?
Short answer: a little, but probably not in the way you think. Midterms rarely set markets on fire. But this one lands at a strange moment.
The AI trade is running hot, the US government is sitting on $40 trillion of debt, and oil is above $100 a barrel. A change in who controls Congress touches all three.
So today, we’re going to unpack what happened overnight, why markets care about Congress in the first place, what history tells us, and what it all means for you as an Indian investor in US stocks.
Let’s dive in.
First, what just happened?
Votes are still being counted and not every race has been called. But early results suggest Democrats are on track to win control of both the House and the Senate, a bigger swing than even many optimistic forecasts had expected.
Going in, polls had favoured Democrats in the House, while the Senate was seen as a toss-up.
Markets had a slightly confused night.
Asia reacted first, and it didn’t like what it saw. Japan’s Topix fell nearly 1%, and Taiwan’s index dropped 0.8% to a three-month low. The worry? That a Democratic Congress might come down harder on the data center boom, which has been feeding the region’s chipmakers for two years now. South Korea’s KOSPI, though, shook off early losses and closed up 0.6%.
Then things calmed down. By the time Europe opened, stocks were rising there too, and S&P 500 futures had turned around to trade about 0.2% higher. Oil, meanwhile, just bounced around near $103 a barrel.
So: a wobble, not a panic. To understand why, we need to take a step back.
Why do markets even care who runs Congress?
Here’s a quick primer. The US has three centres of power that matter for policy: the President, the House of Representatives, and the Senate. When one party holds all three, it’s called a trifecta. That’s what Republicans have had since 2025.
With a trifecta, a party can pass big laws on taxes, spending and regulation fairly easily. Lose even one chamber, and that power shrinks dramatically. Every major bill now needs both parties to agree, and the President can still veto anything Congress sends.
Now, you’d think markets would hate that kind of standoff. Oddly, they often like it.
There’s an old saying on Wall Street: gridlock is good. When Washington can’t agree on much, it also can’t spring big surprises on businesses. Less change means a more predictable environment. Companies can commit to long-term projects without worrying that the rules will flip next quarter, and that tends to be good for earnings.
Think of it like a cricket pitch. Batsmen don’t need a perfect pitch. They need one that behaves the same way every over.
But gridlock has a dark side, which we’ll get to in a bit.
What does history say?
If you look at the numbers, midterm years are usually the weakest of the four-year US election cycle. The S&P 500 has averaged just 7.5% in midterm years, compared with 12.4% in other years. The last two midterms were especially rough: the index fell 4.4% in 2018 and 18.1% in 2022.
But here’s the interesting part. Things tend to pick up after the vote.
Across the last 14 midterms since 1970, the S&P 500 has risen an average of 1.7% in the month after the election, and 15.5% over the following six months.
The logic is simple. Before the vote, markets are guessing. After it, they know. And markets hate guessing more than they hate bad news.
There’s a wrinkle, though, and it’s relevant this year. When the ruling party has lost its trifecta, the six-month post-election return has averaged 10.4%, versus 16.1% when it didn’t. Still positive, just less exciting. And in the eight midterms since 1930 where the President’s party lost the House, stocks still rose through year-end five times.
And 2026 has already been an odd year. US stocks were up 13.1% through August, the sixth-best start to a midterm year since 1926, with remarkably few wild days along the way.
The AI elephant in the room
If there’s one part of the market that should be paying close attention, it’s AI.
Over the last couple of years, Big Tech has been pouring staggering amounts of money into data centers: giant warehouses full of chips that power AI models. That spending has been one of the biggest drivers of the S&P 500’s roughly 27% gain since 2025.
But data centers have a PR problem. They guzzle electricity, and people living near them have started to push back. Polls show only about one in three Americans approve of how fast data centers are being built. States are already reacting. Ohio has seen a growing number of local ballot measures asking for data center moratoriums, and Texas is auditing the building process more closely.
So why does Congress matter here? Because a party that controls Congress controls its committees, and committees can hold hearings and launch investigations. That could mean pushes for safety standards on advanced AI models, independent testing, incident reporting, and tighter accountability for data center developers.
None of this would kill the AI story. But markets have priced in a lot of optimism, and even a little doubt about how fast AI can grow tends to cause sharp moves. That’s exactly what Asian chip stocks were reacting to last night.
One reassuring data point, though: Technology has ranked among the top two S&P 500 sectors under each of the last four Presidents, from both parties. Sector winners have rarely followed a political script.
The debt ceiling: a 2027 problem that starts now
Remember the dark side of gridlock we mentioned? This is it.
The US government doesn’t have unlimited permission to borrow. Congress sets a cap, called the debt ceiling, and when the government hits it, lawmakers have to vote to raise or suspend it. When the White House and Congress are controlled by different parties, that vote can turn into a high-stakes game of chicken.
The timing isn’t great. US debt recently crossed $40 trillion, and the government is expected to hit the limit again sometime between late winter and midsummer of 2027.
Here’s why that matters for stocks. Long shutdowns and fiscal standoffs make bond investors nervous, which can push US yields higher. And when yields rise, stocks start to look more expensive by comparison. There’s another twist: if the President keeps leaning on executive powers, a Democratic Congress may not be able to rein him in much, so volatility could stick around either way. The flip side is that the US economy and corporate earnings are still strong, which is why sharp selloffs in such periods have often proved short-lived.
It’s not all gloom on the fiscal side, though. With a split government, deals would likely be limited to must-pass items like the budget, which could keep new spending in check. Whether that’s enough to actually fix America’s debt problem is a very different question.
So, what does this mean for you?
If you’re an Indian investor holding US stocks or ETFs, here’s how we’d think about it.
The election result matters less than staying put. Here’s a neat thought experiment. $100,000 invested in the S&P 500 in 2013 would have grown to about $398,000 by early 2026. But if you’d pulled out to cash every time the party you liked was out of power, you’d have ended up with just $214,000 or $186,000, depending on which party you backed. Politics turned out to be a very expensive investment strategy.
Keep an eye on the dollar. If a budget fight starts to hurt growth expectations, the dollar could weaken. For you, that matters twice: once through your US returns, and again when you convert them back into rupees.
Expect noisier tech headlines. If you hold a lot of AI and Big Tech names, Congressional hearings and probes could make the ride bumpier, even if the long-term story holds up.
The bigger picture? History says the months after a midterm have usually been kind to US stocks, and this year started from a position of strength. The things to really watch aren’t the election results themselves, but how Washington handles AI and the 2027 debt ceiling.
That’s it for today. If this helped you make sense of the noise, share it with a friend who’s been refreshing their portfolio all morning.