Shares slid 6.3% in after-hours trading Tuesday after Oklo Inc. reported its fiscal 2025 results: $139.3 million in operating losses, zero revenue, and a confirmed delay of its flagship Idaho nuclear reactor to 2028. The stock fell after the company disclosed rising cash burn guidance alongside the timeline slip. The selloff landed atop a broader market rout — the S&P 500 dropped 1.4% — but Oklo's plunge was nearly five times steeper, signaling investors are punishing the company specifically.

  • The Loss Was Bigger Than Wall Street Expected. Oklo posted a net loss of $0.72 per share, worse than the $0.61 analysts had forecast.

The $139.3 million operating loss stemmed primarily from payroll, business expenses, and professional fees tied to capital markets and project deployment.

The company also guided 2026 cash usage of $80–$100M for operations and $350–$450M for investing — meaning the spending ramp is accelerating before any dollar comes in the door.

  • The First Reactor Keeps Slipping. The Aurora reactor at Idaho National Laboratory now targets nuclear heat production in 2028, a slight shift from prior expectations, which management attributed to the realities of first-of-a-kind construction.

Earlier guidance had targeted commercial operations between late 2027 and early 2028. For a pre-revenue company, every month of delay extends the period shareholders must finance losses with no income to show for it. Any further snags in fuel delivery, licensing, or construction could easily knock the 2028 timeline off course again and ramp up costs.

  • A Mountain of Cash — But It's Melting Fast. Oklo ended 2025 with $1.4 billion in cash and raised an additional $1.182 billion in early 2026 by completing its $1.5 billion at-the-market stock offering program. That's roughly $2.6 billion in liquidity — enough runway for several years even at elevated burn rates. But selling new shares to fund operations dilutes existing investors, effectively spreading ownership across more people.

  • Big-Name Partners Aren't the Same as Revenue. Oklo's customer pipeline includes non-binding letters of interest from Equinix, Diamondback, and Prometheus Hyperscale, plus a 12-gigawatt agreement with Switch and a prepayment from Meta for a 1.2-gigawatt Ohio campus. These headlines impress, but Oklo's own filing acknowledges that shares remain a bet on future execution rather than any current revenue stream.

The stock tends to be sentiment-driven, and any delay or cost uncertainty is quickly punished.

The core question facing shareholders is simple: can $2.6 billion in cash bridge the gap to 2028 commercialization without further dilution — and will 2028 actually hold?