Check out the companies making the biggest moves premarket: On Semiconductor , Synaptics — The stocks diverged in opposite directions after On Semiconductor announced an all-stock deal to acquire Synpatics. At nearly $7 billion, it’s On’s largest acquisition ever and will increase the company’s total addressable market by $30 billion, it estimated. Shares of On were falling by more than 15%, while Synpatics’ stock rose 2.5%. Memory stocks — Shares were lower of several memory players as a tech sell-off continued to gain steam in premarket trading Friday. Micron was down more than 4.5% after jumping nearly 16% on Thursday following its earnings report. Sandisk also declined the same amount as Micron, while Seagate Technology and Western Digital were each off about 3.5%. Chipmakers — The tech sell-off also hit semiconductors too, as shares were also weighed down by a New York Times report that OpenAI was seeking to potentially delay its IPO until 2027. Arm Holdings and Marvell Technology were both down about 4%. Advanced Micro Devices was off 3.5%, while Intel tumbled 3%. Broadcom also fell, but only by 1.5%. Rocket Lab — The aerospace company rose 1.5% after NASA announced Rocket Lab will provide the launch services for two missions. The missions will be to conduct research about the Sun’s energy input into Earth and a deeper understanding of ice clouds that form on the planet. Apple — Shares bucked the tech sell-off trend and rebounded slightly after Apple had its worst day in over a year on Thursday. The stock was up 0.5%, after declining more than 6% in its sharpest decline since April 2025 after the company hiked prices for a slew of its devices over rising memory and storage costs. Energy stocks — Oil prices were off more than 3% and once again below $70 per barrel, bringing energy stocks down with it. APA Corporation fell more than 1.5%, while Diamondback Energy declined 1%. Constellation Energy and Occidental Petroleum were both down 1%.
Stocks making the biggest moves premarket: Sandisk, On Semiconductor, Rocket Lab & more
Jun 26, 2026
