DFEN closed Tuesday near $61, down from roughly $92 on August 6. That is a third of the fund gone in eighteen trading sessions, and a number that size invites the assumption that something broke. Nothing broke. The fund did precisely what its prospectus says it does, and the entire result is available from one line of arithmetic.

DFEN targets three times the daily return of the Dow Jones U.S. Select Aerospace & Defense Index. That index fell somewhere in the region of 11% across the same stretch. Spread evenly over eighteen sessions, an 11% decline works out to about 0.65% a day. Triple it and the fund loses 1.94% a day. Compound 1.94% eighteen times and the result is 29.7%. The realised loss was 33%. So of the thirty-three points, close to thirty are leverage applied to direction, and roughly three are everything else.

The Philadelphia Semiconductor Index closed Friday more than 20 percent below its late-June record, the technical threshold for a bear market. Two trading sessions later, the index is up a combined figure north of 7 percent, with Tuesday’s 3.7 percent gain marking the second consecutive advance. The question facing the sector is whether this is the start of a genuine recovery or a bounce inside a larger correction.

What Broke the Rally

The selloff had three distinct triggers layered on top of each other. First, valuation exhaustion: chip names had posted triple-digit year-to-date returns before the reversal, leaving the trade crowded and vulnerable to any negative catalyst. Second, a competitive scare — a Chinese open-source model release narrowed the perceived gap with frontier US labs, raising questions about the compute intensity assumptions baked into AI infrastructure spending forecasts. Third, TSMC’s capital expenditure guidance came in well above prior estimates, which the market read as a margin-pressure signal rather than a demand-confirmation signal. Once the reversal began, systematic de-risking and algorithmic flow amplified the decline across both US and Asian listings, with SK Hynix and Samsung posting double-digit single-session drops in Seoul.