Here are some statistics on the U-Boot project, from a U-Boot list posting by Wolfgang Denk of DENX Software Engineering. The Full List is at the below URL. The subset list below are just the top contributing companies. The posting by Wolfgang also shows the top individuals.
Processed 664 csets from 126 developers
26 employers found
A total of 41330 lines added, 31385 removed (delta 9945)
Top changeset contributors by employer
(Unknown) 170 (25.6%)
Socionext Inc. 105 (15.8%)
Google, Inc. 88 (13.3%)
NXP 80 (12.0%)
Konsulko Group 42 (6.3%)
Texas Instruments 28 (4.2%)
Samsung 26 (3.9%)
Xilinx 26 (3.9%)
ARM 20 (3.0%)
DENX Software Engineering 14 (2.1%)
…
Top lines changed by employer
Konsulko Group 21331 (35.5%)
(Unknown) 8685 (14.4%)
Socionext Inc. 8227 (13.7%)
NXP 8112 (13.5%)
Google, Inc. 5308 (8.8%)
DENX Software Engineering 1904 (3.2%)
ST Microelectronics 1801 (3.0%)
Openedev 1105 (1.8%)
Samsung 866 (1.4%)
CompuLab 844 (1.4%)
…
Employers with the most signoffs (total 111)
NXP 28 (25.2%)
Xilinx 16 (14.4%)
DENX Software Engineering 15 (13.5%)
Samsung 13 (11.7%)
(Unknown) 9 (8.1%)
Google, Inc. 9 (8.1%)
Collabora Ltd. 6 (5.4%)
ARM 5 (4.5%)
Intel 4 (3.6%)
Socionext Inc. 3 (2.7%)
…
Employers with the most hackers (total 128)
(Unknown) 65 (50.8%)
NXP 17 (13.3%)
Texas Instruments 7 (5.5%)
Xilinx 4 (3.1%)
DENX Software Engineering 4 (3.1%)
Google, Inc. 3 (2.3%)
Intel 3 (2.3%)
Socionext Inc. 3 (2.3%)
Samsung 2 (1.6%)
Collabora Ltd. 2 (1.6%)
…
More info:
http://www.denx.de/wiki/U-Boot/UbootStat_2017_03
https://lists.denx.de/listinfo/u-boot