The S&P 500 is supposed to be the boring part of your portfolio. By buying an S&P 500 fund, the idea is that you gain access to 500 of America’s largest companies, keep costs low, and let compounding do the work. The MAX S&P 500 4X Leveraged ETN (NYSEARCA:SPYU) takes that idea and straps four times leverage to it. If the S&P 500 gains 1% today, SPYU targets roughly 4%. If the index falls 1%, you lose roughly 4%. At face value, that sounds straightforward until the market suffers a real correction. A 10% decline can translate into a loss approaching half your money depending on how the selloff unfolds, yet investors have still built a position worth nearly $600 million in the product.
Four Times the S&P 500, One Day at a Time
SPYU is not technically an ETF. It is an exchange-traded note issued by Bank of Montreal that targets four times the daily return of the S&P 500 Total Return Index. The emphasis on daily performance is important. SPYU does not promise four times the S&P 500’s return over a month, a year, or even a week. Rather, the leverage resets at the end of every trading day, making your eventual return dependent on the path the market takes to get there. Bank of Montreal explicitly describes the notes as daily trading tools for sophisticated investors rather than buy-and-hold investments.
The math gets uncomfortable quickly. While it can be fun to think about the potential 4x leveraged upside, downside scenarios are much more sobering.
If the S&P 500 dropped 10% in a single trading session, SPYU would theoretically fall about 40% before fees and other adjustments. In dollar terms, a $10,000 investment becomes roughly $6,000. Spread that correction across multiple volatile sessions, and the result can be even worse. Down days shrink your capital base, rebounds then compound from that smaller balance, and another decline hits the reset exposure again. That volatility drag (sometimes referred to as volatility decay) is why a choppy 10% market correction can push losses toward 50%.
Bank of Montreal’s own prospectus warns that investors can suffer significant losses even when the S&P 500 ultimately finishes a longer holding period higher.
Investors Are Still Showing Up
None of that has stopped SPYU from finding an audience.
Bank of Montreal initially sold just $4 million of the notes when SPYU launched in December 2023. By February 2026, $200 million of principal was outstanding after accounting for a two-for-one split. Today, 16 million notes are outstanding with a market capitalization of roughly $595 million based on August 14 figures.
SPYU has also benefited from the same risk-on environment driving money toward leveraged products more broadly. More than 200 leveraged ETFs launched during the first half of 2026 alone as investor appetite for aggressive equity exposure continues to grow (a statistic that should be cause for concern).
This Is a Trading Tool, Not a Better S&P 500 Fund
While SPYU has a legitimate use case, it is prudent to approach these kind of products with a bit of skepticism.
A trader with a strong short-term bullish view can obtain enormous S&P 500 exposure without borrowing directly on margin. That said, SPYU should not be confused with a higher-powered replacement for SPDR S&P 500 ETF Trust (NYSEARCA:SPY) or other similar index funds. SPYU adds daily leverage, volatility decay, financing costs, and credit risk. These risks can remain hidden while stocks rise steadily. However, they can become impossible to ignore when the market turns sharply negative.
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