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Actionable insights — The nuclear stock boom could keep decaying

The repeatable analysis behind the column: not "sell Oklo," but how to tell a thematic mania is still priced hot after a drawdown — and where to look for the safe-looking alternative's hidden risk.
2026-SEP-17 · WSJ Markets A.M. · Spencer Jakab · Read ↗ · full analysis · transcript
How to read this page: each insight is a method distilled from the column so it can be rerun on the next hot theme. The boxed line shows how it played out here.

1. A big drawdown from peak is not the same as cheap

The repeatable method
  1. For a theme stock that has fallen hard, measure the fall against the run-up, not just the peak: a stock that rose 3,000% and halved is still up ~15×.
  2. Check valuation on fundamentals (profits, path to profitability), not on distance from the high.
  3. Treat analyst downgrades on "path to profitability" and failed/postponed IPOs as signs the marginal buyer is exhausted.
Here: some nuclear names are down well over half, yet valuations "mostly remain too hot"; OKLO had rallied ~3,000%, UBS cut SMR to sell, Holtec postponed its IPO and XE has lost more than half since listing.
Watch for

2. Separate real demand from the timeline the stocks price in

The repeatable method
  1. Confirm the demand story is real (here: AI data centers wanting reliable low-carbon baseload).
  2. Then ask how long supply takes to arrive (permitting, construction, reactivation) and who captures the demand now vs later.
  3. Favor the businesses already earning from the demand; discount the ones whose revenue sits years out.
Here: new reactors take years to get off the drawing board, so near-term hyperscaler deals (Microsoft, Amazon "behind the meter") went to existing plants — benefiting fleet owners like CEG/NRG, not pre-revenue SMR developers.
Watch for

3. Check crowding before calling the "safe" play safe

The repeatable method
  1. When a staid sector name becomes the consensus way to play a hot theme, look for crowding measures (sell-side crowding lists, hedge-fund ownership, positioning data).
  2. A profitable business can still underperform if everyone already owns it.
Here: Citigroup lists both CEG and NRG among the most "crowded" utility stocks.
Watch for

4. Buy cyclical-fashion themes when they are out of fashion

The repeatable method
  1. Identify themes with a history of boom/bust investor sentiment (nuclear falls out of favor roughly every decade).
  2. Keep a watchlist of the quality names and wait for the sentiment trough rather than chasing late-stage rallies.
Here: "The smart move might be to wait for nuclear power to go out of fashion again" — the technology and demand are real, "but the AI boom's glow can still cause burns."
Watch for

Methods distilled from Spencer Jakab's WSJ Markets A.M. newsletter for personal study. Not investment advice. © The Wall Street Journal / Dow Jones for source material.