SPXL is designed to deliver three times the daily return of the S&P 500 by rebalancing swap exposure each afternoon to 300% of the prior close. This daily reset creates path dependence, so choppy or reversing markets can cause volatility drag and long-term value erosion even if the underlying index ends flat. The described position was bought in May 2010 and held for sixteen years without selling, turning a roughly $70,097 cost basis into about $4,090,890 in value. The unrealized gain is reported as long-term with no short-term component. The outcome was driven by a long, smooth uptrend in the S&P 500 after 2010, which reduced the negative effects of volatility drag.
"SPXL is engineered to deliver 3x the daily return of the S&P 500. Every afternoon the fund rebalances its swap exposure back to 300% of the prior close. That daily reset is the whole product, and it is also the thing that should have made this trade fail."
"So why did $70K become $4 million instead of a tax-loss write-off? The mechanism that turned a tactical product into a 16-year hold Path dependence cuts both ways. Volatility drag punishes a chop tape and rewards a smooth uptrend. The post-2010 S&P 500 delivered one of the cleanest grinding bull markets in American history."
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