Oklo falls 5% as Piper Sandler splits nuclear sector

Piper Sandler put a Buy on Oklo and a Sell on X-Energy in the same morning note, and the market marked all three advanced nuclear developers down by roughly 5% anyway — including the one it liked.

Oklo (NYSE: OKLO) fell 5% to $40.50, extending its year-to-date decline to 44%. NuScale Power (NYSE: SMR) dropped 5% to $10.32 and X-Energy (NASDAQ: XE) slid 5% to $16.42 in Thursday afternoon trading, according to 24/7 Wall St. data. The selling stayed inside the group: the Global X Uranium ETF (NYSEARCA: URA) lost 3% while the SPDR S&P 500 ETF Trust (NYSEARCA: SPY) slipped 0.5%, which puts the pressure in the nuclear complex rather than the broad market.

Analyst Dimple Gosai initiated coverage on the sector with opposing calls, starting Oklo at Buy with a $55 price target and X-Energy at Sell with a $9 target. "Oklo's business model is bankable by design," Gosai wrote, arguing the structure makes projects easier to finance and customers easier to secure. Her note cited bipartisan federal policy support and demand from large cloud operators for reliable, carbon-free power as tailwinds for the industry overall.

The two initiations imply a 36% upside to Oklo and a 45% downside to X-Energy from Thursday's prices — a 81-percentage-point spread inside a group that until now traded on a single narrative. The distinction Gosai drew is structural, not technological. Oklo finances, builds, owns and operates its plants and then sells the electricity, so a buyer can secure nuclear power without becoming a developer or taking on responsibility for deploying unfamiliar reactor technology. X-Energy's more asset-light approach leaves customers carrying more of the technology and project risk.

The reactor designs are not what separates them

Oklo is developing a fast reactor cooled by liquid sodium instead of water, a design that avoids the high-pressure steam systems used in conventional reactors. It targets first commercial power at its Aurora powerhouse at Idaho National Laboratory in late 2027 to early 2028, backed by a customer pipeline of roughly 14 GW anchored by a 12 GW agreement with Switch.

NuScale Power holds the only U.S. Nuclear Regulatory Commission design certification in the small modular reactor industry — SMRs are typically under 300 MWe and factory-built rather than constructed on site. The company ended the second quarter of 2026 with $1.9 billion in cash and investments as ENTRA1 Energy advances a Tennessee Valley Authority program for up to 6 GW.

X-Energy came public in April 2026, raising roughly $1.1 billion in net proceeds, and counts Dow, Amazon and Centrica among its anchor customers. It received no rating action from Piper Sandler beyond the Sell.

The demand backdrop that made all three 2026 momentum names is unchanged. The Department of Energy projects data centers will account for up to 12% of U.S. electrical demand by 2028, a figure that has powered the group higher for much of the year alongside DOE support and hyperscaler nuclear agreements. What changed Thursday is the sell-side consensus that every name in the group deserved the same treatment.

What would confirm the rotation

The reaction is the tell. A fresh Buy initiation on Oklo produced a 5% decline in Oklo, which means the marginal seller was not reading the rating — it was reading the sector. Advanced nuclear has traded as one basket, and a split rating removes the one thing a basket trade needs: a uniform bull case. When a single research call can move three unrelated business models by the same amount, the correlation is the position, not the fundamentals.

For the rotation thesis to hold, Oklo needs to decouple. The milestones that would do it are licensing and site-construction progress at Idaho National Laboratory, which would test the bankable-by-design argument with permits rather than prose. NuScale's path runs through the ENTRA1 and TVA program and its $1.9 billion balance sheet, which funds a longer runway than either peer. X-Energy has to prove that an asset-light model can still convert a $1.1 billion IPO raise and blue-chip customers into deployed reactors.

Oklo's 44% year-to-date decline is the number that frames the longer view. A stock down that far sits at a very different price than it did when AI power demand was the consensus trade, and the $55 target implies the sell side still sees the gap closing. Whether the group keeps trading as one ticker or splits into three is now the question that decides which of these prices is wrong.

This article is for informational purposes only and does not constitute investment advice.