Nebius Group has added 33% in a single week to $225.74, leaving its short book — nearly 29% of the free float — nursing fresh losses ahead of a second earnings print in under two weeks.
The borrow picture is the most dynamic element right now. Availability briefly recovered to 45% in the days after the July 28 report as longs sold and returned shares to the lending pool. That window slammed shut. Availability is back to roughly 10% — only one share available for every ten already borrowed — reversing the week-on-week reading by more than 53%. The 52-week low on availability is 0.63%, and the pool touched zero as recently as late July, so this tightening has precedent. Cost to borrow has climbed to 1.26%, up a third on the week, its highest in six weeks. Short interest itself barely moved — just 0.3% higher on the week at 28.9% of float — which means the 21% monthly build that defined July is still fully in place, and those shorts are now deeply offside against a stock that has nearly doubled since June. The ORTEX short score has held an eerily stable 70.8–71.1 for two weeks straight, and the short score rank sits at the 3rd percentile of the universe, a signal of extreme positioning.
Options tell the opposite story. The put/call ratio has collapsed to 0.96 — more than two standard deviations below its 20-day average of 1.15 — the most bullish reading in the options market in months. The 52-week high on the PCR is 1.30; the current level is one of the lowest of the year. The jump in call demand is consistent with a stock up 33% on the week, but its magnitude — a full 2.2-sigma move on the PCR — suggests this is more than mechanical delta hedging. Someone is adding upside exposure with urgency.
The Street is catching up but divided. Two initiations arrived this week: Piper Sandler opened at Neutral with a $224 target — essentially at the current price — while Baird came in at Outperform with $250. Earlier in July, Northland lifted its target from $248 to $410, the most aggressive call in the analyst universe. The mean price target is $255, implying modest upside from here, though the Morgan Stanley Equal-Weight at $144 is a meaningful outlier on the bearish side. The bull case rests on the $17 billion Microsoft revenue agreement, an asset-light GPU partnership model, and strong AI compute demand. Bears point to regulatory risk around the company's historical Russian parentage, limited data center management depth, and a valuation that now prices considerable execution. The EV/EBITDA multiple has compressed by over a turn in the past 30 days to 11.8x, but the PE remains deeply negative. The EPS surprise factor score ranks in the 5th percentile — the company has consistently missed earnings estimates — which makes the August 12 print consequential.
Institutional ownership provides one anchor of stability. CEO Arkady Volozh holds 11.5% of shares. Situational Awareness LP added an entire 4.8% stake since May. BlackRock and Jennison have both been adding through June. The insider picture is noisier: Chairman John Boynton sold roughly $1 million of stock in tranche sales on July 15, though all at prices between $187 and $202 — well below where the stock trades today, and with trade significance scores of just 2 out of 10, the sales look mechanical rather than conviction-driven. The net 90-day insider position is actually positive at $33.9 million, driven by earlier buying that predates this week's surge.
The August 12 earnings report is the fulcrum. The last two prints produced a 21% one-day drop and a 23% one-day rally respectively — the stock moves violently on results. Going in, availability is tightening, call buyers are dominant, short sellers are deeply offside, and a key analyst initiated at the market price this week rather than above it. How the borrow pool reacts in the 48 hours following the print — whether availability reopens again or tightens further from 10% toward zero — will reveal whether the short book finally capitulates or holds its ground for a third consecutive earnings cycle.
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