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CRSP enters the final stretch before its November 3 earnings date with short sellers adding to an already heavy position and the stock down more than 5% on the week, a combination that frames the next four weeks as a genuine test of the bull case.
The short side of the trade is the dominant story this week. Short interest has climbed to 21.7% of free float, up 5.7% over the past seven days and 10.4% over the past month, a steady, deliberate build rather than a single-session spike. That level is high in absolute terms and puts CRSP in the bottom 3% of the universe on short score rank, with the ORTEX short score running at 79.8. Borrow costs, however, remain surprisingly cheap at 0.58%, barely changed on the week, signalling that the increase in short positions has been absorbed without straining the lending pool. Availability has actually loosened this week, moving to roughly 119% of short interest from around 86% a week ago, meaning there is currently more supply in the lending market than there are shares already borrowed. The lack of squeeze pressure is notable given the scale of the short position. Options positioning broadly matches: the put/call ratio at 0.55 is only modestly above its 20-day average of 0.54, a z-score of 0.69, well short of any defensive extreme.
The Street is constructive but not closing the gap to the current price. All coverage sits at buy or outperform, with no sell ratings on record, and targets cluster between $80 and $110 against a stock trading near $52. Citigroup raised its target to $88 following the August earnings print, but the last formal consensus update was late August and the data is now 49 days old. The most cautious voice on the register is Bernstein, which carries a Market Perform and a $56 target, roughly where the stock was trading when that target was set in May. Bulls point to CTX310's 12-month data showing a mean 78.6% reduction in ANGPTL3 at the highest tested dose, no new safety signals, and management's expectation that Casgevy reaches more than $1 billion in global sales by 2030. Bears counter that the cohorts are small, durability across the broader platform remains unproven, and the company's dependence on Vertex and Bayer partnerships introduces structural risk. Factor scores lean in the bears' direction on fundamentals: EPS momentum ranks in the 22nd to 27th percentile over 30 and 90 days, and EPS surprise ranks in the 36th percentile, reflecting a business still burning cash. Price-to-book at 3.4x has edged down slightly over the month.
Retail attention is worth noting as a separate signal. Wikipedia page views ran at a z-score of 1.6 against CRSP's own 90-day history in late September, an elevated but not extreme reading. The dataset is flagged as attention, not a revenue indicator, and there are no measured leading datasets for this company, so the signal is colour rather than a read on the upcoming print.
Institutional ownership adds one interesting layer. ARK Investment Management holds roughly 9.5 million shares, nearly 10% of the company, and reported a further purchase of 545,000 shares through September. BlackRock added 669,000 shares and State Street added 703,000 shares in the same period. Those are meaningful additions from three of the largest holders simultaneously. No 13D activists are on the register. The recent 13G activity worth flagging is Capital International, which filed in February showing its stake had fallen to 1.2% from 7.4%, a sharp reduction that reflects the kind of exit that can persist under the radar once a holder drops below the filing threshold.
CRSP's recent earnings history shows the stock can move sharply in either direction. The two most recent prints produced one-day moves of plus 5.8% and plus 10.6%, while the May release brought a 3.6% decline and an 11.4% five-day slide. The November 3 print, with the stock down roughly 6% on the month and short interest at a multi-month high, is the obvious event to watch: the question is less about Casgevy's headline numbers and more about whether the CTX310 cohort data due before year-end is large enough to shift the durability debate.
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