Premarket mixed as Alphabet, Constellation, Vicor move higher

Alphabet is up about 2% after announcing Gemini 4 Argon, Constellation Energy is up around 4% on a 20-year nuclear-power agreement with Amazon, and Vicor is sharply higher after raising guidance. Micron is slightly lower despite its blowout report. Traders are watching initial jobless claims, S&P manufacturing PMI, ISM Manufacturing and Fed commentary ahead of Friday's September jobs report.