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SDS · Analysis updated Nov 10, 2026, 6:00 PM ET
Why is ProShares UltraShort S&P500 (SDS) stock moving?
No news items or SEC filings were found for SDS in the 14 days before the current date, so this view rests only on the price and volume data. SDS seeks twice the inverse of the S&P 500's daily return, so its price rises when the index falls. Over the 14 sessions shown, the close moved from 54.57 on Oct 22 to 56.44 on Nov 10, a gain of about 3.4%. The main event was Nov 5: the stock rose about 8.9% from 54.28 to 59.09, with volume of 14.78M shares, about 2.6 times the period average of roughly 5.7M, and it traded in a 54.44 to 59.13 range. Since no news explains that session, the data alone cannot say what drove it. The following sessions gave back part of the gain: Nov 6 closed at 58.76, and Nov 9 fell about 4.7% to 56.03 on 6.8M shares, with a low of 55.58. Nov 10 closed at 56.44 in a narrow 56.14 to 57.20 range, which is still above the roughly 54.3 level seen in late October and early November. The spike-and-fade pattern on heavy volume suggests the Nov 5 move did not hold, but the evidence is thin. Because SDS resets daily, its returns over months can differ noticeably from twice the inverse of the index's return, especially in choppy markets, which weighs on the longer horizons.
About ProShares UltraShort S&P500
ProShares UltraShort S&P500 is a leveraged inverse ETF launched in 2006 that aims to return twice the opposite (-2x) of the S&P 500's daily move, before fees. It is meant as a short-term trading or hedging tool, so it gains when US large-cap stocks fall and loses when they rise.
How the fund works
It gets its -2x exposure through derivatives, mainly short S&P 500 E-mini futures and swap agreements. Most of its assets sit in cash-like holdings such as a money-market fund and Treasury bills, and the interest on those pays for its fairly high dividend yield. The fund resets its exposure every day. Because of daily compounding, returns over periods longer than one day can stray far from -2x the index, especially in choppy markets, and the fund has tended to lose value over long holding periods. The net expense ratio is about 0.91%, and assets are roughly $350 million (approximate).
What usually moves SDS
- Daily S&P 500 moves (inverse, 2x)
- Market volatility and compounding decay
- Short-term interest rates on collateral
- Recession or risk-off sentiment
- Swap and futures financing costs