Comment by gonzoua

And lots do. Top 20 sponsored contributions from 01/01/2016 up to now sorted by number of commits (not the best metric, but still)

  1031 The FreeBSD Foundation 
   888 EMC / Isilon Storage Division
   379 Microsoft OSTC
   339 Microsoft
   297 Solarflare Communications, Inc.
   277 Dell EMC Isilon
   221 DARPA, AFRL
   170 Mellanox Technologies
   144 Chelsio Communications
   128 ABT Systems Ltd
    90 Spectra Logic Corp
    88 HEIF5
    70 Cavium
    58 Smartcom - Bulgaria AD
    57 Stormshield
    48 Netflix
    45 Rubicon Communications, LLC (Netgate)
    42 Multiplay
    38 ScaleEngine Inc.
    35 Citrix Systems R&D