AI Bubble Fears Hit Fever Pitch as S&P 500 Capex Goes All-In on Machine Learning

The AI trade has officially jumped the shark. If you thought the only thing frothier than a ChatGPT prompt was the capital expenditure line on a US tech balance sheet, you’re not alone. A new survey making the rounds on March 8, 2026, has professional investors clutching their pearls over the scale of AI-driven spending. According to Fool.com, AI-related stocks now account for a staggering 90% of the S&P 500’s total capex since late 2022. That’s not a typo. It’s a moonshot allocation that would make even SoftBank’s Vision Fund blush.

The market’s reaction? A collective side-eye and a creeping sense of déjà vu. The S&P 500’s slow-motion grind lower, as reported by Seeking Alpha, is happening even as tech’s capex orgy continues. The disconnect is palpable. On the one hand, you have companies shoveling billions into data centers and LLMs, convinced that the next trillion-dollar winner is just one GPU cluster away. On the other, you have a market that’s starting to price in the possibility that not every AI project will print money. The last time we saw this kind of capital concentration was the dot-com bubble, and we all know how that ended.

Here’s the kicker: this isn’t just a US story. Global equities are flatlining, and the AI capex surge is sucking oxygen away from every other sector. Industrials, consumer staples, even energy, everyone else is fighting for table scraps. The result is a K-shaped market where the AI haves keep spending, and the have-nots are left explaining to their boards why their share price hasn’t doubled. The risk, of course, is that when the music stops, there won’t be enough chairs for everyone.

The technicals are starting to reflect the underlying tension. XLK, the S&P tech ETF, is stuck at $137.26, refusing to budge even as headlines scream about AI breakthroughs. The lack of volatility is almost eerie. It’s as if the entire sector is waiting for a catalyst, good or bad, to break the stalemate. Meanwhile, the VIX is elevated, and cross-asset correlations are starting to fray. The market is telling you that something big is brewing, even if the price action hasn’t caught up yet.

The macro backdrop isn’t helping. Oil is above $100, the Middle East is a powder keg, and China just threw a curveball with a hot inflation print. In this environment, the AI capex surge looks less like visionary leadership and more like a collective case of FOMO. If rates stay higher for longer, a lot of these projects will start to look like expensive science experiments. The risk of a capex hangover is real, and the market is starting to price it in.

Strykr Watch

Keep a close eye on XLK’s $137.26 level. A sustained break above could signal a new leg higher for AI stocks, but failure to hold opens the door to a sharp correction. Watch for earnings revisions in the next reporting season, if capex fails to translate into revenue, expect a wave of downgrades. The S&P 500’s slow grind lower is a warning sign. If the index breaks below recent support, the AI sector could be the first domino to fall. Monitor VIX for signs of a volatility spike, if it jumps above 30, brace for a sector-wide shakeout.

From a technical perspective, the lack of movement in XLK is unsustainable. RSI is stuck in neutral, and moving averages are converging. This is the calm before the storm. Traders should be ready to move quickly when the breakout (or breakdown) comes.

The risk is that the AI capex bubble bursts before the rest of the market catches on. If companies start to guide lower on margins or capex ROI, the unwind could be brutal. On the other hand, a genuine AI breakthrough could reignite the rally, but the odds are getting longer. This is a market that rewards skepticism, not blind faith.

For those looking for trades, consider straddles or strangles on XLK to capture the coming volatility. Pair trades, long legacy tech, short AI pure plays, could also work if the bubble narrative gains traction. Just remember: when everyone is on the same side of the boat, it doesn’t take much to tip it over.

Strykr Take

The AI capex surge is a warning, not a buy signal. The market is telling you that the easy money has been made, and the next move will be violent, one way or the other. If you’re still all-in on the AI trade, check your risk, tighten your stops, and be ready to pivot. The bubble isn’t popping yet, but the air is getting thin.