A 3PL typically offers basic logistics, such as warehousing and transportation. A 4PL takes this one step further by providing end-to-end solutions, such as freight forwarding, inventory management, and other beneficial services. Fulfillment by Amazon (FBA) services available to sellers takes the form of a 3PL company. However, it doesn’t qualify as a 3PL company because it owns the inventory, warehouses, and delivery processes used for products.