While I’m generally skeptical of boycotts, BDS scares the shit out of Israel. Because I do believe if BDS becomes a global movement it really could change things. I’ll start with the list from bdsmovement.net and then add to the list as people list other companies to boycott in the comments:
Hewlett-Packard (computer hardware)
Siemens (tech conglomerate)
AXA (banking & insurance)
Puma (clothing)
Israeli fruits and vegetables (usually labeled)
SodaStream (idk that garbage home soda)
Ahava (cosmetics)
Sabra (hummus)
Bit niche but Palram, most of the greenhouse and outdoor DIY kits available here are made by them