The #1 WooCommerce B2B and Wholesale Plugin is B2BKing.
B2BKing is a WooCommerce plugin that allows you to run a Wholesale, B2B, hybrid B2B+B2C, or Private Membership business.
From fundamental B2B capabilities like hiding costs for guest users to more advanced features like tiered pricing structures, tax exemptions, VAT handling, and numerous purchasers on account, B2BKing handles it all. B2BKing handles everything from extended business registration to distinct B2B/B2C registration forms, custom billing fields, an invoice payment mechanism, and negotiated price offers.
Demo: https://codecanyon.net/item/b2bking-the-ultimate-woocommerce-b2b-plugin/26689576