As chip stocks slide again, regulators move against the leveraged funds amplifying the market's swings

Finance News 5 min 80 sources

Memory-chip stocks fell for a second week and the AI rally wobbled — and underneath the swings sits a fast-growing kind of fund built to double or triple each day's move. South Korea just moved to rein it in, while Fed officials floated raising rates and Netflix, Uber and Visa each made headlines.

Key takeaways

A fast-growing kind of fund that doubles or triples a stock's daily move is amplifying the market's swings — buying as prices rise and selling as they fall — and South Korea just moved to rein it in.
The Fed's tone flipped from cutting rates to possibly raising them, as inflation stays stubborn and the average US mortgage rate hit 6.55%, its highest in nearly a year.
Netflix fell 8% on a merely-fine quarter, Uber bid $14.8bn for Delivery Hero to dominate food delivery, and Visa and Citadel pushed further into crypto's payment plumbing.

The amplifier under the market

The AI-and-chip rally that carried Wall Street all year had a rough Thursday. Memory-chip makers led the fall — Micron slid again, South Korea’s SK Hynix dropped, and the Nasdaq headed for a losing week as chip stocks weakened [16][65][74]. On the surface it looks like ordinary profit-taking after a long climb. Underneath sits something newer.

A growing share of the day’s trading now runs through leveraged ETFs — funds built to deliver two or three times the daily move of a single stock or index [50]. If a chipmaker rises 3% in a day, a 2x fund aims to rise 6%; if it falls 3%, the fund falls 6%. To keep that fixed multiple, the fund has to rebalance every single day: after the market rises it buys more, and after it falls it sells [50]. So these funds mechanically chase the trend — pouring money in as prices climb, pulling it out as they drop. When they grow big enough, that buying and selling pushes the very prices they track, and a small move becomes a large one. Reuters’ markets desk called the resulting momentum trade a “short-term steamroller” [55].

Regulators have noticed. On Thursday South Korea said it will temporarily halt new listings of single-stock leveraged funds, after a surge in products tied to Samsung Electronics and SK Hynix, to curb the wild swings [73]. It will also more than double the minimum cash a trader must hold to buy them — from about 10 million to 30 million won, roughly $20,300 — starting August 5 [73]. The ban lasts until markets calm [73]. It is a rare, blunt move: a country stepping in not because a company failed, but because the tools people were using to bet on stocks had started shaking the stocks themselves.

For an ordinary saver: you almost certainly don’t own these funds. But if your pension or index fund holds the same chipmakers, the extra volatility these bets create is riding along in your account too.

The Fed talks about hiking, not cutting

For most of the year, markets assumed the Federal Reserve — America’s central bank — would be cutting interest rates by now. This week the tone flipped. Vice Chair Philip Jefferson said the Fed may need to raise rates if inflation doesn’t ease soon [10]. Dallas Fed President Lorie Logan called for “modestly” higher rates [14], and Kansas City’s Jeff Schmid called inflation “concerning” and the main focus of policy right now [24]. It came days after the new chair, Kevin Warsh, stopped telling markets what the Fed would do next; senators noted his cautious “tone” in his first testimony [79].

The immediate cause is stubborn inflation. The deeper one is an economy that keeps running warm — the Fed’s own Beige Book this week described robust activity and a labour market picking up [44], and weekly jobless claims fell again [1]. A hot economy makes prices harder to cool.

The ordinary-person angle: borrowing is getting more expensive, not cheaper. The average 30-year US mortgage rate climbed to 6.55%, its highest in nearly a year [27]. Anyone waiting for spring’s promised relief on a home loan is still waiting.

A good quarter, punished

Netflix reported results roughly in line with expectations and its stock fell more than 8% [37]. Revenue rose 13.4% to $12.56 billion and earnings beat forecasts by a whisker [37]. The problem was the outlook: guidance for the coming months landed shy of what Wall Street wanted, and investors had already priced the good news in [33][37]. The stock had fallen 31% in the three months since its last report — so a merely-fine quarter wasn’t enough [37].

Netflix also said it will publish its viewership data once a year instead of twice, starting in 2027 [37]. A company gets to choose which numbers it shows the world; when growth slows, showing them less often is one lever it can pull.

Uber’s $14.8bn bet on being everywhere

Uber launched a $14.8 billion offer for Delivery Hero, the German food-delivery group, in a deal that would create the world’s largest food-delivery platform [3][12]. Uber offered €41.50 a share, and after accounting for the quarter of the company it already owned, will pay about $13.7 billion [3]. The combination would stitch Uber Eats together with Delivery Hero’s brands across 99 countries — foodpanda in Asia, PedidosYa in Latin America, talabat in the Middle East — a business that booked $236 billion in orders in 2025 [3].

To ease competition worries, Uber won’t take Delivery Hero’s operations in 14 countries where it’s already strong; those go to a New York private-equity firm, SSW Partners, for $1.6 billion [3]. The value here isn’t kitchens or couriers — it’s owning the app people open when they’re hungry.

Quieter shifts worth noticing

Wall Street keeps walking into crypto — through the back door of payments. Visa, which settles roughly $15 trillion a year, launched a platform to let its 15,000 partner banks and 200 million-plus merchants handle stablecoins — digital dollars backed by reserves to hold a 1-to-1 peg to the dollar — inside their existing systems [38]. Separately, the trading giant Citadel Securities put $400 million into the exchange Crypto.com, valuing it at $20 billion [7]. Neither is a bet on prices; both are bets on the plumbing that moves money.

Gold sat near record highs as nervous money looked for shelter [9], and oil rose again on intensifying US-Iran hostilities and a fresh threat to shipping through the Red Sea [13][35].

And a puzzle that keeps economists guessing: Americans say the economy feels dreadful, yet keep spending. Retail sales rose 0.2% in June, the fifth straight monthly gain, with May revised up to a strong 1% [5]. Sentiment and behaviour have quietly parted ways.

02 · Lesson · why it matters

The bet that moves the thing it's betting on

A tool built to ride a market's swings can end up making them — buying as prices rise, selling as they fall.

A promise that has to be kept every day

Picture a fund with a simple pitch: whatever a chipmaker’s stock does today, we’ll do twice as much. Up 3%, the fund is up 6%. Down 3%, down 6%. It’s a clean promise, and millions of dollars pour in to take the ride.

But keeping that promise is not passive. To stay at exactly two-to-one, the fund has to adjust its bet at the close of every single day. When the stock rises, the fund’s exposure quietly drifts below double, so it has to buy more to catch up. When the stock falls, its exposure drifts above double, so it has to sell. The rule is unbending: buy after a gain, sell after a loss. Every day, no exceptions.

Sit with what that means. This is the exact opposite of the advice everyone gives — buy low, sell high. To keep its promise, the fund must buy high and sell low, mechanically, forever.

The amplifier

One small fund doing this changes nothing. The market doesn’t notice a pebble.

But these funds have grown fast, and a lot of them now crowd into the same handful of popular stocks — the AI names, the chipmakers. When those stocks tick up during the day, an army of funds must all buy more before the close. Their buying pushes the price up further. The next day starts higher, so they buy again. On the way down it runs in reverse: a dip forces selling, the selling deepens the dip, the deeper dip forces more selling.

The tool built to ride the wave has started to make it. A bet on how much a stock will move is now, in part, the reason it moves that much. This is a feedback loop — the response feeds back into the thing it was responding to and makes it bigger. It’s why a market can lurch far more than the day’s actual news would explain. The news was ordinary; the machinery stacked on top of it was not.

You are already in the loop

It is tempting to file this under “things traders do to each other.” It isn’t.

If you hold a plain index fund, or your pension owns a slice of the market — and most do — you own the same chipmakers these funds are whipsawing. You never bought a leveraged product. You never wanted the extra swing. But the volatility manufactured by strangers’ daily rebalancing is priced into the shares you hold. On a violent day, the number in your retirement account moves more than your own patience would ever have moved it. You are not watching this from the shore. You are in the water with everyone else, and the wave doesn’t check who made it.

What the label leaves out

Notice the words on the tin: twice the daily move. That one small word, “daily,” is doing quiet work. Over a single day the promise holds. Over weeks of choppy up-and-down, the daily resets grind the fund down, and it can badly trail twice the stock’s actual return — a decay that isn’t hidden, exactly, but isn’t the headline either. The simple, exciting framing serves the people who sell these funds, who earn fees on all that daily churn.

That doesn’t make the tool a villain. In careful hands, over a single day, a leveraged fund is a real way to hedge or place a sharp bet. The same instrument that steadies one skilled trader’s book can, multiplied across a crowd, unsteady the whole market. Both things are true at once. That is why South Korea didn’t ban the funds outright — it raised the price of entry and paused new ones, trying to keep the useful version while draining the dangerous crowd.

The whole, held loosely

Once you see it, you start seeing it everywhere: a measure that changes the thing it measures, a response that amplifies its own cause. A ranking that funnels buyers to whatever already ranks high. A rumour of a bank in trouble that empties the bank. The feedback loop is one of the oldest shapes in any system that watches itself and reacts.

The humbling part is not that these loops exist. It’s that no one standing inside one can see all of it. Each fund is just keeping a simple daily promise. Each saver is just holding an index fund. Each regulator is just watching one market. None of them is steering the storm, yet together they are the storm. The next time a market lurches and the headlines reach for a tidy reason, hold the reason loosely. Some of the move was the news. Some of it was only the market, watching itself, and flinching.

03 · Lab · your turn

Same News, Different Machine

Set how much of a market runs through leveraged funds and watch the same month of news get amplified into a wild swing — feeling how much of a price move is real and how much is the machine.

04 · Hope · carry this

A market's wildest day loses its grip once you can tell the real news from the machine amplifying it. And the fact that regulators are already naming that machine is a quiet sign that a system can still learn to steady itself.