Serve Robotics heads into its May 13 earnings call with nearly 30% of its free float bet against it, the borrow market fully tapped out, and options traders rotating toward calls — a contradictory setup that makes the print unusually charged.
Short positioning is the dominant story here. Short interest has climbed roughly 10% over the past month to just under 30% of the free float, and the ORTEX short score of 83.3 puts it in the top tier of the entire US market on that composite measure. The borrow market has hit maximum tightness — availability is at zero, meaning every share in the lending pool is currently lent out. That is a structural constraint: short sellers who want to add exposure have no fresh inventory to work with, and existing shorts face elevated cost to unwind if sentiment turns. Cost to borrow has been running in the 17%–22% range for the past six weeks, volatile session to session but showing no sign of relief. That combination — near-30% SI, exhausted availability, and double-digit borrow costs — is the clearest possible signal that the bear camp is both large and committed.
Options positioning pushes in the opposite direction. The put/call ratio has dropped to 0.44, notably below its 20-day average of 0.51 and roughly 1.5 standard deviations below the mean. That means call volume has been outrunning puts for several sessions running — a lean toward upside optionality rather than downside protection. The divergence between the size of the short position and the direction of options flow is the most interesting tension on the tape right now. Bears have locked in a large structural short; the options market is not doubling down on it.
The Street leans bullish on the name. Eight analysts carry buy-equivalent ratings, with a mean price target around $18, more than double the current price of $8.77. The most recent action of note came on April 20, when Guggenheim initiated with a Buy at $13 — a more conservative entry point than peers but still well above current levels. Cantor Fitzgerald trimmed its target from $17 to $16 in March while keeping its Overweight rating. The bull case rests on the 2,000-unit Gen3 robot rollout and a projected revenue run rate of $60–80 million; the bear case centres on Nvidia's 2025 divestiture of its 10% stake, which rattled sentiment and contributed to a prolonged de-rating from earlier highs. The price-to-book sits at 2.4x, the only valuation multiple that is clearly positive — everything else, including EV/EBITDA at –3.3x, reflects a company still burning cash.
Insider activity has been one-directional. The CEO, COO, and CFO have each sold shares on multiple occasions since early March, with the CEO alone offloading around 28,000 shares across two clusters in March and April. The values per transaction are modest — the largest single CEO sale was roughly $131,000 — and the trades appear to be part of systematic programmes rather than large discretionary moves. BlackRock and Vanguard have both added meaningfully in recent months, with BlackRock increasing its position by over a million shares to 6.2% of the company, lending some institutional ballast to a heavily shorted name.
The last earnings print on March 11 produced a muted reaction — the stock fell less than 1% on the day. The upcoming May 13 release carries a different setup: short interest is materially higher, the borrow market is at capacity, and options positioning has shifted toward calls. Whether that combination produces a squeeze, a flush, or a non-event is the question the market will spend the next four days pricing.
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