Occasionally, I've gotten questions about "technology" or "high tech". While we can get reports, there is no one business code that encompasses such a broad category.
The AeA, formerly the American Electronics Association, "uses 45 SIC codes to define the high-technology industry." The organization recognizes that "these 45 SIC codes do not comprehensively cover the entire high-tech industry as the structure of the SIC system is limited. In an effort to produce solid statistics, AeA's definition consists of SIC codes that fall into three broad categories -- high-tech manufacturing, communications services, and software and computer-related services. It does not include broad categories if the high-tech portion does not represent a clear majority. Also, AeA's definition does not include many 'related' industries, such as biotechnology, engineering services, and research and testing services."
Likewise, "the 49 NAICS codes that AeA has chosen for its definition of high tech." The BLS ALSO has its list of NAICS Codes here.