Bloom Energy heads into its May 21 earnings call with short sellers moving quickly back into a stock that has risen 68% in a month — and with the Street's price targets already lagging the rally.
The most striking development this week is the sharp rebuild in short interest. SI climbed 21.5% in a single week, jumping from roughly 8% of the free float to 9.8% — the highest level in the past six weeks. That reverses a meaningful unwind that followed the April 28 earnings print, when shorts had covered aggressively as the stock surged 22% in a day. Bears are now re-engaging at prices more than $50 above where many of them exited. The week's move adds approximately 4.9 million shares to the short book in just five sessions. With 21 days to the next event, the rebuild looks deliberate rather than mechanical.
Despite the renewed short pressure, the borrow market itself is not flashing stress. Availability is extraordinarily loose at over 3,300% of short interest — meaning there are roughly 33 shares available to lend for every one currently shorted. Cost to borrow has barely budged, running at 0.39% annualised, a level consistent with generic market cap rather than any squeeze dynamic. Bears rebuilding here face no meaningful friction in finding stock to short. The ORTEX short score has ticked up from 42.5 to 46.0 over the past two weeks, a meaningful move but still well short of a high-conviction bearish reading. Options add a layer of caution: the put/call ratio is at 1.13, within a whisker of its 52-week high of 1.14, and running 1.4 standard deviations above its 20-day average of 1.02. Traders are paying for downside protection at almost the most defensive level of the past year.
The Street is in an unusual position. Analysts almost universally raised targets after the April 28 earnings beat — JP Morgan went to $267, Citi to $281, Barclays to $254 just yesterday — yet the stock at $280.69 has already blown through most of them. Only RBC Capital's $335 target, raised from $143 on April 29, sits meaningfully above the current price. Consensus across the book is still mixed: several major firms maintain Neutral or Equal-Weight ratings even after lifting numbers aggressively, a signal that the Street acknowledges momentum but is uncomfortable endorsing the valuation at these levels. At a trailing P/E of 97x and EV/EBITDA of 77x, the multiples demand near-perfect execution. The EV/EBITDA has compressed 49 points over the past 30 days as EBITDA has grown faster than the stock — a genuine improvement — but the absolute level remains elevated. Bloom's factor scores are exceptional on earnings momentum: EPS momentum over 30 and 90 days ranks in the 99th and 98th percentiles respectively, and forward EPS growth is in the top percentile of the entire universe.
Insiders have been consistent sellers throughout the rally. The Chief Legal Officer sold shares on three separate occasions in April and May, including 35,000 shares at $279 on April 29 — right at the post-earnings peak. The COO sold in April. A director sold 25,000 shares on May 7. Across 90 days the net insider position is marginally positive in share count terms, but the dollar value of sales totals more than $95 million. These are not distress sales — prices range from $135 to $279 — but the cadence of selling into every leg of the rally is a consistent signal that management is lightening exposure at these levels.
The fundamental backdrop remains genuinely strong. Bloom landed what is described as a record AI data centre deal this week, and the bull case centres on its positioning as a clean, dispatchable power source for data centre operators who cannot wait years for grid connections. The April quarter delivered record revenue and margin, and guidance was raised. Peer FCEL surged 26% on the week, reflecting broader enthusiasm for the fuel cell space. VRT added 7.7%. The energy-for-AI theme is real and growing.
What to watch next: the May 21 earnings call will test whether Bloom can further quantify the AI demand pipeline and provide concrete capacity expansion milestones — because at current valuations, guidance tone will matter at least as much as the headline numbers.
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