Nebius Group heads into the back half of September with a genuinely contradictory setup: the stock just gained 14% in a week, yet shorts are adding to positions, a new sell-side initiation carries an $84 target against a $236 stock, and options traders have swung to their most bullish posture in months.
The options signal is the sharpest change this week. The put/call ratio has dropped to 0.86 — more than two standard deviations below its 20-day average of 0.91 — the lowest call-heavy reading in the past year. That means options positioning has rotated to its most bullish extreme as the stock hits new highs, a reversal from the cautious tone flagged in earlier notes. Whether that reflects genuine conviction or simply chase behaviour after a 14% weekly move is the open question.
Short positioning tells a more stubborn story. Shorts rebuilt steadily through the week before a small trim on Tuesday, leaving 45.7 million shares short — 21% of the free float. That's a slight uptick from last week's 46.1 million reading and consistent with the re-accumulation phase noted yesterday. The prior August peak of 63 million shares remains the reference point; current levels are well off that high, but the covering wave has clearly stopped. Borrow availability eased materially — from 46% a week ago to 64% today — giving would-be new shorts more room to establish positions. Cost to borrow has ticked up 49% on the week to 0.84%, rising from a mid-month low but still far below the 1.75% seen when availability was nearly exhausted in late August. The ORTEX short score is stable at 68.2, a notch below Monday's 68.6, suggesting the aggregate short signal hasn't broken in either direction. Days to cover is 2.3 days by official FINRA data — not extreme, but enough to matter if sentiment shifts quickly.
The analyst picture is the most divisive element this week. Rothschild initiated with a Sell and an $84 target on September 21 — the most bearish published view on the stock. That sits against a Truist Buy with a $355 target initiated two weeks earlier. The spread between those two initiations is $271. Citigroup raised its Buy target to $324 following August's earnings, Baird lifted to $340, and DA Davidson's Neutral call held at $250. The mean target implies roughly 17% upside at current prices, but that average is being pulled in very different directions. Bulls point to NBIS's vertically integrated AI cloud infrastructure model, NVIDIA and Microsoft partnerships, and a revenue opportunity in high-performance computing. Bears flag decelerating growth projections toward 48% y/y by 2028, regulatory risk around US data center buildout, and a compensation structure heavily weighted toward options and RSUs. The consensus sits at Hold — two analysts, both rated there — which understates how far apart the fundamental views actually are.
Institutional positioning is itself a notable story. NVIDIA holds 9.3% of the company via a 13G filed in July, and Goldman Sachs has built to 10.5% as disclosed in August, up from 7.2% previously. These are passive registrations, not activist campaigns — the company carries no 13D activist on its register — but the quality of the register is unusually high for a pre-profitability AI infrastructure name. Founder Arkady Volozh remains the largest single holder at 10.75%, trimming minimally. Lone Pine and Situational Awareness each initiated new positions in Q2. The EPS momentum factor scores are exceptional — 94th percentile on 30-day and 98th percentile on 90-day — despite the company currently losing money on a trailing basis.
Peer context adds one more layer. CORZ gained 17% on the week, WULF rose 20%, and CIFR and KEEL each jumped over 26% — NBIS's 14% gain actually lagged the broader compute-infrastructure tape this week, an unusual dynamic for a name that has been the group's standout all year. The next earnings print is November 12 — the last two results showed a 32% single-day rally in August and a 21% drop in July, giving the stock a history of outsized moves in either direction. How the borrow availability trend develops into that event, and whether the Rothschild bear case finds any traction on the Street, are the threads worth watching.
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