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The source provides the following information:
Top 100 companies only
* 2007 figure reflects a correction to 2006 reported revenues. Actual growth was 4 percent.
† In 2010, several notable companies did not participate in the survey, skewing the results.
** In 2012, a major company was not ranked and a further company's systems integration revenue was adjusted downward, leading to a decrease in reported revenue.
‡ In 2014, a major company was not ranked, leading to an apparent decline in total revenue.
*** Several of the largest systems integrators either did not reply to the source's requests for information, could not comply due to restrictions of being publicly held, or were omitted due to acquisition.
‡†Several of the largest systems integrators that did not participate in the 2016 report are ranked in the 2017 report, including ACT, Securitas Electronic Security, and the combined entity of Johnson Controls/Tyco Integrated Security.
‡‡Several of the largest systems integrators among the top 25 that were ranked in the 2017 report are not ranked in the 2018 report, such as Johnson Controls (due to lack of publicly available information on its systems integration business), Kratos Public Safety & Security Solutions Inc. (acquired by Securitas ES), and others.