Short Sellers Lose Momentum as SpaceX Shares Rally Strongly from Post-IPO Lows
Table of Contents
You might want to know
Why has short interest in SpaceX fallen so quickly just as the newly public stock climbs?
How will upcoming lockup expirations and a larger public float affect future volatility and short-selling activity?
Main Topic
Short sellers who had positioned against SpaceX are stepping back from their bets as the company's publicly traded shares recover from an earlier post-IPO decline. Measured as a percentage of the tradable float, short interest dropped to roughly 11% of publicly traded shares on Wednesday, a steep fall from the near-34% peak recorded last week, according to data compiled by S3 Partners. That shift reflects both sellers closing bearish positions and a material increase in the number of shares available for trading after an initial lockup expiration.
The contraction in short exposure came at the same time SpaceX shares were staging a sizable rebound from their post-earnings sell-off. Short covering — the process by which investors who borrowed and sold shares buy them back to close positions — can add upward pressure to a rally because the repurchase demand magnifies existing buying interest. In this episode, that dynamic likely contributed to a notable intraday move: shares rose about 11% on Wednesday to near $148, placing the stock roughly 10% above the $135 IPO price and around 41% above the early-August low.
SpaceX has experienced sharp swings since listing publicly. The stock initially sold off after the company released its first earnings report, which showed capital expenditures that substantially exceeded revenue — a detail that raised investor questions about the scale of spending required to pursue the company’s long-term goals. Those concerns attracted a wave of short selling, pushing short interest to very high levels relative to the limited public float.
That situation changed meaningfully last Thursday when roughly 911 million SpaceX shares became tradable after an initial lockup expired. That newly available tranche represented around 7% of total shares outstanding and exceeded the number of shares sold in the IPO. By expanding the tradable float, the unlocked shares mechanically reduced short interest when expressed as a percentage of the float. At the same time, S3 Partners reports that active short covering — investors buying back borrowed shares to exit their positions — has been a substantive part of the decline in short interest.
Market participants often describe a situation where "shorts are out of bullets" to convey that those who wanted to push a stock lower have already committed most of their capital or positioned to the limits of available shares. As Ihor Dusaniwsky, managing director of predictive analytics at S3 Partners, put it, there is only so much capital an investor can deploy into a single trade. When many bearish investors unwind the same trade, it can accelerate a stock’s rebound.
However, the picture remains dynamic. Additional lockup expirations loom: prospectus timelines indicate roughly 319 million more shares may unlock on Aug. 20, followed by about 700 million in September and a similar amount in October. Each tranche of newly tradable shares could increase supply and give insiders, employees, and early investors more opportunities to sell, potentially introducing renewed volatility. Greater supply also means it will be easier for new short positions to be established if market sentiment turns negative again.
The net effect of these developments is twofold. Near term, the enlarged float has reduced the headline short-interest percentage and, combined with active covering, helped fuel the recent rebound. Over the medium term, however, a substantially larger pool of tradable shares increases liquidity but also raises the possibility of renewed downward pressure should selling accelerate or investor concerns resurface.
In assessing the risk-reward environment for SpaceX going forward, investors will weigh company fundamentals — including capital spending plans and revenue trajectory — against the mechanical effects of lockup expirations and the evolving mix of public holders. Key to near-term price behavior will be whether new supply is absorbed by fresh buyers or whether selling from newly unlocked shareholders predominates.
Key Insights Table
| Aspect | Description |
|---|---|
| Short Interest Decline | Short interest fell to about 11% of tradable shares from a peak near 34%, per S3 Partners. |
| Float Expansion | ~911 million shares unlocked recently, increasing the tradable float and reducing short interest as a percentage. |
| Short Covering Impact | Buybacks by shorts to exit positions likely amplified the recent upward move in the stock. |
| Price Movement | Shares rallied about 11% in a session, trading near $148, roughly 41% above the Aug. 3 low. |
| Upcoming Risks | Further lockup expirations (Aug., Sept., Oct.) will add supply and may increase volatility or enable renewed short activity. |
Afterwards...
Looking ahead, market observers and participants should monitor several interrelated factors. First, the pace and scale of insider and early investor selling once additional shares unlock will be central to near-term supply-demand dynamics. Second, developments in the company’s operational performance — notably capital expenditure trends relative to revenue and any updates on profitability pathways — will influence investor sentiment and whether fresh buying interest materializes to absorb new supply.
From a broader perspective, continued transparency around spending plans and clearer milestones for revenue growth could help reduce uncertainty. Investors may also benefit from watching metrics such as turnover in the free float, changes in institutional ownership, and short-interest trends measured in both shares and as a percentage of the evolving float.
As more shares become tradable, liquidity should improve, but so too may the potential for swift price swings. Careful attention to upcoming lockup expirations, company disclosures, and macro market conditions will be important for anyone evaluating exposure to SpaceX shares.