Shares of SNXX, the Tradr 2X Long SanDisk Daily ETF, climbed to $18.22 on Monday morning — a 7.02% gain — after SanDisk officially joined the S&P 100 index before the market open, capping a remarkable five-session surge that has seen the leveraged fund nearly double from its $13.73 close just one week ago.

  • Index Inclusion Forces Big Funds to Buy, Creating a Short-Term Tailwind. When a stock enters the S&P 100, every index fund and exchange-traded fund that tracks that benchmark must purchase shares to match the new lineup. That wave of mandatory, price-insensitive buying pushes the underlying stock higher — and because SNXX is designed to deliver twice the daily return of SanDisk shares, even a modest move in the stock gets magnified. The +22% climb in SNXX over the past three trading sessions reflects exactly this dynamic: a real, mechanical source of demand meeting a leveraged product built to amplify it.

  • SanDisk Joins Alongside Major Tech Names, Signaling Sector Momentum. SanDisk was not the only addition — Dell Technologies, Palo Alto Networks, and Arista Networks also entered the S&P 100 in the same reshuffle. A batch of technology entrants at once confirms that the committee sees these firms as large and liquid enough to represent the U.S. large-cap market. For SanDisk specifically, the upgrade raises its profile among institutional investors who use S&P 100 membership as a screening filter, potentially broadening its shareholder base well beyond the initial index-rebalancing flows.

  • Leveraged ETFs Reward Day Traders but Punish Long-Term Holders. SNXX delivers two times SanDisk's daily move, not two times its cumulative return over weeks or months. Because of a mathematical effect called compounding decay — where daily gains and losses multiply in unpredictable ways — the fund can drift far from a simple "double" of the stock over time. Investors riding the momentum should understand that a single sharp reversal day could erase an outsized share of recent gains at twice the normal speed.

  • Broader Tech Strength Is Helping, but It Won't Last Forever. A risk-on environment, with technology shares leading the broader market higher, is providing additional lift. That backdrop flatters SNXX today, but it also means the fund is exposed to two sources of potential reversal: any fade in SanDisk-specific index-buying flows and any rotation away from tech. If either turns, the 2x leverage works in reverse.

The bottom line: The S&P 100 inclusion is a legitimate, structural positive for SanDisk's stock. For SNXX holders, however, the question is timing — the easy money from forced index buying is a one-time event, and the leveraged math grows less forgiving with every passing day.