Nuclear SPACs Keep Coming as AI IPO Pipeline Stalls. Here Is What the Frenzy Actually Looks Like.

OpenAI Punts. Nuclear Does Not.

OpenAI's path to a public listing has stalled, with the company pointing to complications involving SpaceX's valuation as part of the delay, according to reporting aggregated by ZeroHedge. Whatever the reason, the AI IPO pipeline is effectively frozen for its biggest name right now.

The nuclear sector is moving in the opposite direction.

The number of publicly traded reactor development companies has now reached double digits. The list includes NuScale Power (SMR), Oklo Inc (OKLO), NANO Nuclear Energy (NNE), Terrestrial Energy (IMSR), Terra Innovatum (NKLR), Hadron Energy (HDRN), X-energy (XE), Deep Fission (FISN), European developer newcleo (NHIC, also listed as NWCL), and the newest entrant, NuCube Energy (LPBB, ticker to be determined).

X-energy and NuCube: The New Arrivals

X-energy debuted on the public market at a valuation of nearly $10 billion, making it one of the largest nuclear startup listings to date. NuCube Energy is finding its way to the public market through a SPAC merger, joining a wave that also included newcleo's announcement last month.

NuCube's press release highlights a working relationship with Halliburton as a supply-chain differentiator, which is a legitimate edge in an industry where most competitors are still assembling vendor networks. The company has also been accepted into the Nuclear Energy Launch Pad program.

Beyond those two points, NuCube's disclosed commercial pipeline is thin. No memoranda of understanding, no letters of intent with potential power buyers, nothing publicly documented.

The Technology Is Novel

NuCube's reactor design is categorized as a solid-state microreactor. It does not use traditional coolants or pumps. Instead, it relies on advanced heat-wicking methods similar to thermal management systems used in electronics hardware.

The design shares characteristics with concepts from Westinghouse and Antares, but this type of reactor design has some of the least operational experience in the nuclear industry's history. That is not a disqualifier, but it is a fact investors should price in.

Hadron Is Already a Cautionary Tale

One of the earlier SPAC-route entrants, Hadron Energy (HDRN), completed its merger and has since seen its stock fall consistently. ZeroHedge described the trajectory as "digging itself deeper into a hole every passing day."

Holtec, a nuclear industrial company with actual operating experience in spent-fuel management and reactor construction, filed privately for an IPO earlier this year. Holtec has not yet debuted publicly.

A company with real-world nuclear infrastructure is moving carefully. Startups with no operational reactors are racing to list.

Why the Rush?

Two forces are driving the SPAC frenzy. First, national energy security has become a political priority. Second, AI data centers are consuming electricity at a rate that conventional grid infrastructure is struggling to meet, and nuclear is a zero-carbon baseload option that can be sited close to compute facilities.

Those are real structural tailwinds. They do not, on their own, validate every company that attaches the word "reactor" to a ticker symbol.

The Strongest Case for Optimism

Skeptics who call this a bubble should account for one thing: the regulatory environment has genuinely shifted. For the first time in roughly 40 years, there is a credible argument that new reactor designs in the United States could actually reach commercial operation within a decade.

If even two or three of the ten public companies on that list succeed in deploying operational reactors, the sector's early investors could see substantial returns. The problem is that pre-revenue nuclear startups have an extremely long runway between a public listing and a working reactor, and SPAC structures often saddle companies with warrant overhang and redemption pressure before the technology matures.

What Comes Next

NuCube is still finding its way to the public market through its SPAC merger. The critical near-term question is whether NuCube can convert its Halliburton relationship and Launch Pad acceptance into concrete offtake agreements. Without customers lined up, a solid-state microreactor design, however innovative, is a science project with a stock price attached to it.