[b] Companies are ranked according to the value of their arms sales in 2012. An S denotes a subsidiary company. A dash (–) indicates that the company did not rank among the SIPRI Top 100 for 2011. Company names and structures are listed as they were on 31 Dec. 2012. Information about subsequent changes is provided in these notes. The 2011 ranks may differ from those published in SIPRI Yearbook 2013 and elsewhere owing to continual revision of data, most often because of changes reported by the company itself and sometimes because of improved estimations. Major revisions are explained in these notes.
[e] United Technologies acquired Goodrich in July 2012. The figures for 2012 are pro forma figures calculated as if Goodrich had been acquired at the beginning of 2012 and assume that the military share of Goodrich’s sales was even throughout the year.
[f] Due to the limited availability of financial information on Russian arms companies, the arms sales figures for most of these companies in 2011 and 2012 are estimated based on total company sales and are subject to substantial margins of error. There may be other Russian companies that should be in the list but for which insufficient data is available.
[g] Vertolety Rossii (Russian Helicopters) and United Engine Corporation are subsidiaries of OPK Oboronprom, but, since comparable financial data for Oboronprom for 2011 is not currently available, they are reported here as independent companies. For more on Russian arms industry consolidation see Jackson, S. T., ‘Arms production’, SIPRI Yearbook 2011; Jackson, S. T., ‘Arms production’, SIPRI Yearbook 2010; and Perlo-Freeman, S. et al., ‘The SIPRI Top 100 arms-producing companies, 2007’, SIPRI Yearbook 2009, pp. 286–87.
[j] Arms sales figures for Hewlett-Packard are based on data on US prime contract awards from USAspending.gov plus sales to the British Ministry of Defence from UK Defence Statistics. They may be underestimated as awards from classified contracts are not included in the US data.
[k] Arms sales figures for these companies are based on data on US prime contract awards from USA spending.gov. They may be underestimated as awards from classified contracts are not included in this data.
[m] Arms sales figures for SRA International are for ‘National Security’ revenue. As this category includes sales to the US departments of Homeland Security and Justice, as well as to the Department of Defense, it is an overestimate.
[n] Arms sales figures for Bumar Group are estimates and are subject to a high degree of uncertainty. Bumar Group was renamed Polish Defence Holding (Polski Holding Obronny, PHO) in May 2013 and in Sep. 2013 it was announced that PHO would form part of a larger group, the Polish Armaments Group (Polska Grupa Zbrojeniowa, PGZ).