For example, thieves sleep in their bases, go rob, then bring the loot back, or gang territories.
For the companies, companies fluctuate in value based on how much NPC’s buy from them, and expand or start closing down.
#NPC/COMPANY persistence
dawn peak
celest geode
Diet Dwarf fortress
brittle berry
It would be cool to see factions expand directly or indirectly by your actions. Buying from a certain company frequently(ie bananas as a Gorilla) would strengthen them. They might have higher security in their headquarters and warehouses, build more (banana)vending machines around the world, etc.