Bitcoin ETFs: Short a BIT and Cover a BIT

Author:

Leon Gross: Director of Research

November 24, 2025

Short positions in Bitcoin ETFs generally track Bitcoin, showing a reversal strategy (short into strength, cover into weakness).

Divergences matter — October shorts lost, recent covering shows profit‑taking, shorts growing on declines show momentum, bearishness.

Bitcoin correlates ~0.50 with SPX, NDX, AIQ, and XLF. Bitcoin ETF shares outstanding keep rising steadily, independent of price.

The graph overlays real‑time short interest in Bitcoin spot price (XBTUSD) against five Bitcoin ETFs: BITO, IBIT, FBTC, BRC, and GBTC.

Overall patterns are consistent, with investors shorting into rallies and covering into declines — a classic short interest reversal strategy.

The most notable signal occurs when short selling sentiment data diverges from Bitcoin’s price trend. In October, short positions fell during a decline, reflecting momentum rather than reversal.

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Recently, positions have shrunk on declines due to covering activity or profit‑taking. In early November, positions grew as Bitcoin fell, and those trades worked as investors sold out afterwards.

For IBIT, the largest ETF, implied volatility has exceeded realized volatility since June by about 10 points. This spread widened to 20 points in October when Bitcoin hit an all‑time high and investors were buying calls.

The spread has since narrowed to 15 points as put buyers entered the market.

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Bitcoin shows ~0.50 correlation with SPX, NDX, AIQ, and recently XLF.

The general trend in long interest data shows increasing investments in Bitcoin ETFs, a more significant factor than short positioning.

This gradual trend continues regardless of price, underscoring institutional long‑holdings data.

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The information herein (some of which has been obtained from third party sources without verification) is believed by S3 Partners, LLC (“S3 Partners”) to be reliable and accurate. Neither S3 Partners nor any of its affiliates makes any representation as to the accuracy or completeness of the information herein or accepts liability arising from its use. Prior to making any decisions based on the information herein, you should determine, without reliance upon S3 Partners, the economic risks, and merits, as well as the legal, tax, accounting, and investment consequences, of such decisions.

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