Constellation Energy jumps 12.1% at the open while storage stocks slide

As seen on the 24/7 Wall St. homepage on October 6, 2026.

Biggest movers · On the open
Gainers
  • CEGConstellation Energy$300+12.1%
  • SMRNuScale Power$8.27+7.7%
  • MRVLMarvell Technology$288.1+6.2%
  • AAOIApplied Optoelectronics$128.77+5.9%
  • ALABAstera Labs$381.06+5.2%
Losers
  • STXSeagate Technology$831.22-6.3%
  • SKHYSK hynix Inc.$188.84-3.2%
  • IQiQIYI$1-2.4%
  • SNDKSanDisk$1,675-1.7%
  • MUMicron Technology$1,046.76-1.6%

Constellation Energy opened 12.1% higher at $300, the biggest move across 385 priority names, with NuScale Power close behind. Storage is on the other side of the ledger: Seagate down 6.3%, SanDisk and Micron also lower.

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Constellation Energy was the standout mover at the October 6 open, jumping to $300 and posting the largest percentage gain across the priority names tracked. Nuclear-adjacent names followed its lead, with NuScale Power also advancing, a sign the bid is sector-wide.

Semiconductor and optical connectivity names rose together at the open, with Marvell Technology up 6.2%. Traders are pricing a shared AI infrastructure tailwind across the group.

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Storage and memory were the clear drag at the open, led by Seagate's 6.3% decline, the steepest on the losers list. SanDisk, Micron and SK hynix fell alongside it, making the weakness sector-wide.

With Constellation holding a double-digit gain at the bell, the nuclear energy trade is commanding attention that investors with exposure to either side of this divide cannot ignore.

Mentioned: CEG, SMR, MRVL, AAOI, ALAB, STX, SNDK, MU