While Pigs Get Fed—Hogs Get Slaughtered

Warning Signs That the Exponential Growth of Leveraged ETFs Could Create Market Contagion

There’s an old Wall Street proverb:

“While pigs may get fed, hogs get slaughtered.”

In other words, when greed overtakes prudence, excess leverage eventually finds its reckoning.

In 2025, few corners of the market embody that dynamic better than leveraged exchange-traded funds (ETFs). Increasingly, the AI-fueled mega-cap stocks that dominate the S&P 500 are adding fuel and systemic risk to this momentum trade.

Together, they’ve created a cocktail of over-concentration, reflexive leverage, and liquidity fragility that could spark the next market contagion.

The Explosion of Leveraged ETFs Since 2020

From 2020 through 2025, leveraged ETFs have gone from niche trading tools to mainstream products. Global assets under management (AUM) have doubled—from roughly $60 billion to over $120 billion—representing an average annual growth rate of more than 15%.

This rapid expansion has been driven by several forces:

• Retail speculation on zero-commission trading apps.

• Post-pandemic liquidity and stimulus measures that fueled risk appetite.

• Proliferation of sector-specific and single-stock leveraged ETFs marketed as high-octane “access” products for retail investors.

• Institutional hedging strategies using levered ETFs as easy derivatives proxies.

The broader ETF market itself has ballooned to nearly $10 trillion in the U.S., with ETFs now representing one of the main transmission channels for liquidity and risk across asset classes.

Who Dominates the Market

Four issuers control the majority of the leveraged ETF universe—ProShares, Direxion, GraniteShares, and Leverage Shares—accounting for roughly 80% of total U.S. leveraged ETF assets.

TQQQ alone now trades more daily volume than many of the underlying Nasdaq constituents—an indicator of how deeply leverage has permeated passive vehicles.

How Leveraged ETFs Work—and Why They Fail in Volatile Markets

A leveraged ETF seeks to deliver two or three times the daily return of an underlying index. The key word is daily. These funds use futures, swaps, and other derivatives to achieve that target, then reset exposure every evening.

That daily reset is what causes volatility decay or compounding drag. In choppy markets, even if an index ends flat, the leveraged fund often ends down—sometimes by double digits—because each day’s return compounds off a smaller base.

Add in higher expense ratios, derivative funding costs, and tracking error, and the long-term results diverge wildly from the index itself. Leveraged ETFs are built for traders, not investors. Yet an increasing number of 401(k) and IRA participants are being indirectly exposed to them through “enhanced equity” or “tactical allocation” funds that quietly embed leverage.

Margin Mechanics and the Domino Effect

When markets fall sharply, leveraged ETFs face margin call cascades. To maintain target exposure, funds must rebalance, often by selling into a falling market or buying at higher prices during rebounds.

That creates predictable, pro-cyclical end-of-day flows that market participants can front-run. On volatile days, the rebalancing of large levered funds, especially in indices like the Nasdaq-100, can move futures prices, aggravating selloffs, and forcing even more derivative re-hedging downstream.

This mechanical feedback loop was visible during episodes like the 2018 “Volmageddon” collapse of the XIV volatility ETN and again during March 2020, when liquidity gaps in bond ETFs widened discounts to NAV by record margins. Both events highlight how leverage plus daily rebalancing can transform a benign structure into a volatility amplifier.

The Hidden Plumbing: Authorized Participants and Liquidity Gaps

Most investors never think about the authorized participants (APs) who create and redeem ETF shares. When markets are calm, these intermediaries keep ETF prices in line with underlying value. When markets seize up, APs can step back, leaving spreads to widen and prices to detach from NAV.

That’s tolerable in a broad ETF. It’s catastrophic in a leveraged ETF that must rebalance derivatives daily. During stress, these funds may find that hedges cost more, collateral requirements spike, and no one wants the other side of the trade. Liquidity itself becomes the contagion vector.

When Leverage Meets Concentration: The AI-Driven S&P 500

As of late 2025, the S&P 500’s performance and valuation are overwhelmingly driven by AI-centric mega-cap firms. Nvidia, Microsoft, Apple, Alphabet, Amazon, Meta, and Broadcom together represent roughly one-third of total index capitalization. This is the highest concentration in modern history.

Even more striking: AI-related revenues—chips, data centers, cloud AI services—now account for about 70% of forward earnings growth for the entire index. That’s a double concentration risk: investors are both market-concentrated and sector-concentrated in a single technology narrative.

If those seven stocks collectively fall just 5%, they can pull the entire S&P 500 down 1.5–2% in a day.

The AI Circular Economy—and Why It’s Fragile

The AI economy forms a self-reinforcing loop:

1. Nvidia sells chips to Microsoft, Amazon, Google, and others.

2. Those cloud firms monetize AI services that drive demand back to chip suppliers.

3. Investors then price all of them as if exponential scaling is assured.

That circular optimism is embedded in index valuations and in the leveraged ETFs tied to those indices. If the feedback loop slows, due to weaker data-center demand, limited model monetization, or policy constraints, the valuation unwind could mirror the dot-com era’s collapse.

Institutions from the IMF to the Bank of England have drawn parallels between today’s AI valuations and late-1990s speculative extremes. The problem is that passive investors can’t opt out. Their 401(k)s and index funds are mechanically over-weight the same names.

What Happens in a Selloff

Because index-tracking funds mirror market weights, a sharp drop in AI mega-caps translates instantly into broad-based losses. A 15–20% drawdown in those seven firms could erase 7–9% from the S&P 500 and 12–15% from the Nasdaq-100 in short order.

Leveraged and inverse ETFs magnify the damage. Daily resets during multi-day declines can wipe out nearly all capital. The same mechanics that drive outsized gains in bull markets become death spirals on the way down.

If margin calls spread through derivatives desks—as they did in 2008 and again during the 2022 UK LDI crisis—the result could be forced liquidations, widening credit spreads, and cross-asset contagion.

The Reflexive Loop: Options, Gamma, and Leverage

Options activity now adds another amplifier. Retail and institutional investors alike are piling into short-dated call options on the same AI leaders. Dealers hedge those positions by buying the underlying stocks, which pushes prices higher.

That feedback loop—known as a gamma squeeze—works both ways. When traders unwind or options expire, dealers must sell to re-hedge, accelerating downside momentum.

Layer on top the single-stock 3× and proposed 5× leveraged ETFs now being filed with regulators, and the feedback becomes almost instantaneous. When these products all move in the same direction, their rebalancing flows and hedging demands can move entire indices.

Bonds Aren’t Immune: Leveraged Duration Risk

Leveraged bond ETFs pose their own danger. A 3× long-Treasury ETF is effectively a triple-duration bet. In a rising-yield environment, those funds can lose 20–30% in a week. Because many investors use long-duration levered ETFs as “safe” hedges, a rate shock can force them to sell bonds and equities simultaneously—erasing traditional diversification and feeding volatility across markets.

The Plumbing Behind Contagion

When multiple weak links snap together—leveraged ETFs, crowded options positions, AI-stock concentration, and thin liquidity—the system behaves non-linearly. A small event can escalate into a structural failure.

• Levered ETFs rebalance daily through derivatives markets.

• Options dealers adjust hedges in the same names.

• Passive index funds experience outflows and must sell underlying shares.

• Authorized participants and prime brokers step back from risk.

• Liquidity vanishes just as redemption demands spike.

The result: a self-reinforcing selloff, not because fundamentals collapsed, but because structure did.

Lessons from Lehman: Transparency, Liquidity, and Concentration Limits

Lehman Brothers’ pre-crisis risk frameworks still hold timeless lessons.

1. Stress test every portfolio under adverse paths, not just end-points.

2. Maintain liquidity discipline—avoid daily-reset leverage in retirement accounts or funds with redemption mismatch.

3. Enforce concentration limits—no more than 5–10% of holdings in synthetic or niche ETFs.

Those same principles apply to today’s passive investors, who often don’t realize their “diversified” funds may be levered and concentrated at the same time.

Portfolio Safeguards for Passive Investors

• Use equal-weight or global index funds to reduce mega-cap dominance. (Call your advisor and ask for help).

• Rebalance periodically to prevent style drift into over-extended growth sectors.

• Diversify into small-caps, real assets, and non-U.S. markets that have lower correlation to the AI giants.

• Favor factor-based ETFs—value, low-volatility, dividend—during late-cycle phases.

• Avoid daily-reset or inverse products in long-term accounts.

• Run “path-aware” stress tests that simulate multi-day volatility, not just one-day shocks.

The Regulatory Front

The SEC has already expressed doubts about approving 3× and 5× single-stock leveraged ETFs. Expect greater scrutiny of these instruments, tighter disclosure rules, and potential limits on leverage in retirement platforms. Product issuers are racing to secure approvals before that window closes.

The Road Ahead

Leverage isn’t inherently evil, it’s simply gasoline. In disciplined hands, it fuels tactical agility; in complacent hands, it burns the house down.

The current environment—a $120 billion levered-ETF market, record AI-stock concentration, trillions in passive capital, and a derivatives ecosystem built on assumptions of constant liquidity—is combustible.

When everything works, returns look effortless. When the tide turns, the daily reset becomes a guillotine.

As the saying goes, pigs may get fed, but hogs get slaughtered. If you aren’t sure which one you are then step away from the trough and look in the mirror while there is still time.

Yours in health and wealth,

~Chris J Snook

Sources and Further ReadinG

Leveraged ETF Growth, Mechanics, and Risks

• Leveraged Equities ETFs – ETF Database: https://etfdb.com/etfdb-category/leveraged-equities/

• Rapid Growth of ETF Market Triggers Fears of Bubble – Reuters: https://www.reuters.com/business/rapid-growth-etf-market-triggers-fears-bubble-2025-10-17/

• Why 3× ETFs Are Riskier Than You Think – Investopedia: https://www.investopedia.com/articles/investing/121515/why-3x-etfs-are-riskier-you-think.asp

• Can Leveraged ETFs Benefit Your Portfolio? – Morningstar: https://www.morningstar.com/funds/can-leveraged-etfs-benefit-your-portfolio

• The Hidden Costs of Volatility Drag – Aptus Capital Advisors: https://aptuscapitaladvisors.com/leveraged-etfs-the-hidden-costs-of-volatility-drag/

• Understanding the Decay Risk – GraniteShares: https://graniteshares.com/institutional/us/en-us/research/understanding-the-decay-risk-in-leveraged-etfs/

• Important Information About Leveraged and Inverse Funds – Baird: https://www.bairdwealth.com/globalassets/pdfs/help/leveraged-inverse-funds.pdf

• Leveraged and Inverse ETFs: Navigating Regulatory Risks – McNeesLaw: https://www.mcneeslaw.com/leveraged-inverse-etfs-pennsylvania/

Market Structure, Liquidity, and Historical Stress Cases

• iShares: “Authorised Participants and Market Makers in the ETF Industry.”

• Schwab: “Understanding the ETF Creation and Redemption Mechanism.”

• Morningstar: “What Drives ETFs’ Premiums and Discounts?”

• MSCI Blog: “Bond ETFs and Underlying Price Uncertainty.”

• MSRB Report: “Trading in Municipal Bond ETFs During COVID-19 Crisis.”

• AIMS Press: “The Market Impact of Leveraged ETFs: A Survey.”

• SSRN: “The Market-wide Impact of Levered ETF Rebalancing.”

• ScienceDirect: “Market Impact of Predictable Flows from Leveraged VIX Products.”

• Forbes / Yahoo Finance: Post-mortem on the XIV ‘Volmageddon’ Event.

• Chicago Fed Letter and Norton Rose Fulbright: Analysis of the UK LDI Crisis (2022).

AI Concentration and S&P 500 Risk

• Tech Giants Dominate S&P 500, Raising Risk Alerts – Cointribune: https://www.cointribune.com/en/tech-giants-dominate-sp-500-raising-risk-alerts/

• U.S. Markets Present a Double Concentration Risk – Reuters: https://www.reuters.com/commentary/breakingviews/us-markets-present-double-concentration-risk-2025-08-28/

• How the AI Boom Is Concentrating S&P 500 Earnings Growth – Capital Economics: https://www.capitaleconomics.com/publications/capital-daily/how-ai-boom-concentrating-sp-500-earnings-growth

• S&P 500 Erases Earnings-Driven Gain as Big Tech Stocks Slump – Bloomberg: https://www.bloomberg.com/news/articles/2025-10-21/s-p-500-churns-as-investors-assess-mixed-earnings-scorecard

• The Stock Market Is Ultraconcentrated – Morningstar: https://www.morningstar.com/markets/stock-market-is-ultraconcentrated-it-could-get-worse-heres-how-manage-risks-2

• Feeling Tech-Heavy? Diversify With These ETFs – Yahoo Finance: https://finance.yahoo.com/news/feeling-tech-heavy-diversify-etfs-151500080.html

• The Extreme Weight of AI in the S&P 500 – Apollo Academy (PDF): https://www.apolloacademy.com/wp-content/uploads/2025/09/ExtremeAIConcentration-090825.pdf

• However AI Turns Out, The S&P 500 Is A Short – Seeking Alpha: https://seekingalpha.com/article/4831230-however-ai-turns-out-the-s-and-p-500-is-a-short

• Two Arguments Against S&P 500 Concentration Risk – Seeking Alpha: https://seekingalpha.com/article/4831493-2-arguments-against-s-and-p-500s-concentration-risks

• This AI Bubble Is Absolutely Going to Burst – Seeking Alpha: https://seekingalpha.com/news/4506180-this-ai-bubble-is-absolutely-going-to-burst-analyst

Regulatory and Product Development

• SEC Statement on 3×/5× Leveraged ETFs – Reuters: https://www.reuters.com/legal/government/sec-says-unclear-if-proposed-3x-5x-leveraged-etfs-would-be-approved-2025-10-16/

5× Single-Stock and Crypto ETF Filings – Business Insider: https://www.businessinsider.com/leveraged-etfs-single-stock-crypto-funds-sec-government-shutdown-2025-