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Churchill Capital Corp XI has dropped 16% over the past month to $11.24, and the short-interest build that has accompanied that slide is the most telling feature of the week.
Bearish positioning has been climbing steadily. Short interest rose another 5.4% over the past week and is now up roughly 19% over the past month, with shares short reaching approximately 4.24 million. That absolute level is notable for a blank-check vehicle with a modest float. The float percentage cannot be cleanly calculated from the available data, but the directional trend is clear: shorts have been adding throughout September and into October. Cost to borrow has moved up about 9% on the week to 2.85%, modest in absolute terms but consistent with fresh demand for the borrow. Availability, at around 160% of short interest, remains reasonably ample, so there is no mechanical squeeze pressure in the lending pool. The short score has edged up to 66.5, its highest reading of the past two weeks, reflecting the combination of price weakness and building short interest.
Options traders are leaning the other way, which is the real divergence worth naming. The put/call ratio at 0.36 is below its 20-day average of 0.40 and roughly 1.4 standard deviations light on the put side. That makes options positioning notably call-skewed relative to recent norms, unusual for a stock down 16% on the month. Whether that reflects arbitrage-related call buying or simply thin put demand in a low-volatility SPAC name is hard to determine from the data alone, but it sits in contrast to the bearish direction of the short book.
The ownership picture is dominated by Michael Klein, who holds 25.67% of shares through Churchill Sponsor XI LLC via a Schedule 13D filing, meaning this is a disclosed activist stake with control intent. That 13D was filed in December 2025 and covers 14.3 million shares. Several other institutional holders disclosed positions as of June 30, but a number have been trimming: Adage Capital cut from 6.44% to 1.87% as last reported, Millennium reduced from 5.3% to 3.6%, and Magnetar trimmed from 6.44% to 4.58%. Those moves predate the recent price slide and reflect the broader SPAC arbitrage dynamic, where players enter at trust value and exit as deal risk or deadline risk rises. Stakes are as last disclosed, and holders can drop below 5% without a further filing, so the current register may understate how much has already exited. The one insider trade on record is Klein's December 2025 open-market purchase of 500,000 shares at $10.00, a $5 million commitment, though that data is now stale at nearly ten months old.
The next earnings event is flagged for November 13. Historical price reactions around prior events have been muted, with one-day moves close to flat in most cases, though the August 13 event produced a 5.4% gain that reversed into a 13% five-day loss. That pattern fits the SPAC arbitrage dynamic: short-term reactions to news can be sharp but tend to fade quickly.
What to watch is whether the short-interest build accelerates into the November event, and whether any deal announcement from the sponsor changes the calculus for the arb community still holding the stock near trust-value proximity.
See the live data behind this article on ORTEX.
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