Churchill Capital Corp XI has just passed through its earnings event, and the verdict from the lending market is that the bull case on this SPAC has taken a real knock.
The stock fell 9% on August 18 to close at $15.65, reversing nearly all of the prior month's gains. The one-month move is still up 8%, but the sharp single-day reversal — and what's happening in borrow — is the more telling signal right now. A week ago this note described the central tension as rising short interest meeting a rising price. That tension has now partially resolved, with the price giving way.
Short sellers added to positions into and through the event. Estimated short shares climbed roughly 9% on the week to 2.175 million, and are up 81% compared to a month ago. That directional build is consistent across the period: shorts sat near 1 million shares in early July and have roughly doubled since. Borrow availability has tightened in step. It ran above 1,100% in early July; by August 18 it had compressed to 175% — still within a workable range, but less than a sixth of where it was six weeks ago. Cost to borrow edged up 10% on the week to 3.52%, a level that doesn't signal extreme squeeze pressure but does reflect steadily growing demand for shorts. The borrow market is meaningfully tighter than it was, even if it isn't yet distressed.
Options positioning, by contrast, remains stubbornly call-heavy. The put/call ratio is 0.25, nearly one and a half standard deviations below its 20-day average of 0.36. That's the least defensive reading since the July 16 cycle low. The divergence between a put/call ratio near its 52-week floor and a short book that just posted its highest level in two months is worth noting — options traders are not hedging aggressively, while the short book is doing exactly the opposite.
The ownership picture adds another layer of complexity. Michael Klein — the sponsor — holds 25.7% of shares and hasn't moved his position (last reported June 24). Below him, the register reads like an arbitrage roll call: Sculptor, Polar, Fort Baker, Magnetar, Millennium, D.E. Shaw, Moore Capital, ExodusPoint and others each held meaningful positions as of the last filing. Several of those names added fresh stakes as recently as March, which is consistent with the SPAC arbitrage playbook. Millennium trimmed by 734,000 shares through June 30, while Magnetar added 480,000 — a mild internal disagreement in the arb community on direction and timing. Alberta Investment Management also trimmed 600,000 shares. These moves pre-date the most recent data, but they frame the shareholder base as predominantly event-driven, not long-term holders.
The ORTEX short score has drifted in a narrow range around 56 all week — neither elevated enough to signal an extreme nor trending sharply in either direction. What to watch from here is whether availability compresses further in the days following the earnings print, and whether the arb community's next round of 13F filings show further trimming or a fresh rebuild as the SPAC clock continues to run.
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