Ambarella heads into its fiscal Q2 results tomorrow with short sellers rebuilding positions aggressively, options traders at their most defensive in a year, and the stock already down 21% across the past month.
The most striking development this week is the speed of the short rebuild. Short interest has climbed nearly 11% in seven days, reaching 10.8% of the free float — a meaningful position for a mid-cap semiconductor name. Zooming out, the picture is more nuanced: shorts peaked closer to 12% of float at the end of July, then unwound sharply through early August before reversing again. The current build looks like fresh positioning ahead of the report rather than a continuation of a longer trend. Days to cover runs at 3.4 per the latest FINRA settlement data, giving shorts a moderate but real exit burden if sentiment flips.
The options market is telling an even louder story. The put/call ratio has surged to 0.83 — a z-score of 2.17 above the 20-day average of 0.57, and nearly matching the 52-week high of 0.85 recorded on Monday. That is the most defensive options posture on record for this stock over the past year, and it arrived in a single week: as recently as August 21, the ratio sat at 0.46. Borrow conditions do not amplify the squeeze risk — availability is generous at roughly 896% of short interest, and the cost to borrow remains negligible below 0.5%. The lending market is wide open, meaning the short rebuild has been easy to execute and there is no mechanical squeeze pressure from the borrow side.
The Street consensus still leans constructive, with analysts rating the stock a buy and Rosenblatt reiterating its $120 target as recently as August 31 — a 77% premium to the current $67.83. B of A Securities carries a Neutral at $96 following a May upgrade, while Susquehanna sits Positive at $110. The gap between those targets and the current price reflects either an opportunity or a Street that has not yet fully digested the 21% one-month drawdown. The bull case centres on Ambarella's AI system-on-chip platforms and growing automotive content — the Hanwha partnership is cited repeatedly. Bears point to the hyper-competitive semiconductor landscape, the still-early ADAS adoption curve, and key-man concentration risk. On valuation, the stock trades at a trailing P/E just below 70x and an EV/EBITDA of 39x — elevated multiples that leave little margin for execution stumble.
The earnings history sharpens the focus. The June 4 report produced a 14% single-day fall followed by a further 11% drawdown over the next five days. The May 28 release was sharper still: the stock dropped 20% on the day and held those losses over the following week. Neither reaction saw meaningful recovery in the short term. Peer action this week suggests the broader tape is not providing cover either — ALGM fell 5.3% over the week, ATOM shed 13.8%, and INDI dropped more than 10%.
Tomorrow's report is therefore less about whether Ambarella's edge AI narrative is intact and more about whether the guidance line can interrupt a pattern of two consecutive prints that each punished holders by double digits.
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