What is SIC Code / WZ Code?
The Standard Industrial Classification (SIC) code and the German Wirtschaftszweig (WZ) code are state classification systems used to categorize companies by industry. They were originally developed decades ago for statistical purposes, not for modern software sales.
What Are SIC and WZ Codes?
SIC codes (Standard Industrial Classification) are a US classification system from 1937 that assigns each company a four-digit industry number. The German equivalent is the WZ code (Wirtschaftszweig, currently WZ-08), based on the European NACE system. Both serve the same purpose: statistical agencies assign every company to an industry to collect macroeconomic data. And that is exactly where the problem for sales lies — these codes were designed for statisticians, not for salespeople.
The Problem with WZ Codes in B2B Sales
Almost every traditional B2B database (Dealfront, Bisnode, etc.) uses WZ-08 codes to make companies filterable. The fatal disadvantage: these categories are extremely coarse. One example is code 28.41 "Manufacturing of machine tools for metalworking." A software company that wants to read CNC machine data looks for exactly these companies—but has to manually sort out hundreds of irrelevant entries because completely irrelevant screw manufacturers are also hidden in this category.
Three Structural Weaknesses
- Too coarse: A WZ code does not distinguish between a state-of-the-art 5-axis machining-center manufacturer and a small contract shop with an old lathe. Both carry the same code.
- Outdated: Companies that have changed their business model often remain stuck in the wrong code in the commercial register for years. The code is assigned at founding and almost never updated.
- Only one primary industry: A company that both mills parts and offers additive manufacturing receives only one code — half of its reality is invisible.
Why This Hurts Especially in DACH Mechanical Engineering
The German Mittelstand is full of specialized niche players — exactly the Hidden Champions that are most valuable as leads. Yet a WZ code cannot capture their specialization. If you want to sell a machine to manufacturers with cleanroom production, there is no WZ-code filter for it. If you are looking for automotive suppliers with IATF 16949 certification, there is none either. The industry classification says nothing about the technology, certification, or capacity actually present — and that is exactly what determines fit in B2B.
What SIC and WZ Codes Are Still Useful For
To be fair, the codes have their place — just not in sales. For macroeconomic statistics, for government agencies, for coarse market segmentation at a macro level, and as a first, very rough filter, they are useful. Anyone who wants to survey an entire market ("How many metalworking companies are there in Bavaria?") gets a quick answer. The problem only arises when this macro category is sold as a substitute for real lead qualification. The code is a starting point, not a target criterion — and this very confusion costs sales teams in the DACH region time and money every day.
The Modern Alternative: Semantic Profiling
Instead of filtering by a rigid industry number, modern AI-driven sales analyzes a company's technographic data: Which machines are on the shop floor? Which ISO or IATF certificates are advertised on the website? Which materials are processed? This live reality is a thousand times more meaningful than a 30-year-old statistical code. It is also the foundation for a precise Ideal Customer Profile. The decisive difference: while the WZ code describes how a company was classified years ago at founding, the semantic profile describes what the company actually does today — and only that is relevant for sales.
How Kodo Leads helps with SIC Code / WZ Code
Kodo Leads has replaced the SIC code. Instead, we crawl the technological reality of a company in real-time. We don't look for an industry, but for the presence of machine fleets, cleanrooms, patents, and certificates in the company's live content. The result is a list sorted not by statistical pigeonhole, but by genuine buy-fit.
Try for freeFrequently asked questions about SIC Code / WZ Code
Are WZ codes updated?
Very rarely. Companies that have massively changed their business model (pivot) often remain stuck in the wrong WZ code in the commercial register for 10 years. The code is assigned at founding and only corrected in exceptional cases.
Are the codes internationally compatible?
No. The American NAICS, the British UK SIC, and the German WZ-08 codes cannot be mapped without significant data loss. Anyone selling in multiple countries must maintain a separate code logic for each market.
What is the difference between SIC and WZ codes?
The SIC code is the US system, the WZ code its German equivalent based on the European NACE system. Both assign companies an industry number, but they cannot be directly converted into one another and are structured at different levels of granularity.
Why aren't WZ codes sufficient for B2B lead generation?
Because they only reflect the statistical industry, not the actual technology, certification, or capacity. In B2B, however, it is precisely this technical reality that determines fit. Semantic profiling of real website and machine data is considerably more precise.