MAC
$ system_profiler SPUSBDataType
USB:
    USB High-Speed Bus:
      Host Controller Location: Built-in USB
      Host Controller Driver: AppleUSBEHCI
      PCI Device ID: 0x3b3c 
      PCI Revision ID: 0x0006 
      PCI Vendor ID: 0x8086 
      Bus Number: 0xfa 
        Hub:
          Product ID: 0x2514
          Vendor ID: 0x0424  (SMSC)
                       ^^^^ <- vender id
Linux
$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
                       ^^^^ <- vender id

