- <div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/Graphing_the_Norwegian_company_ownership_structure.html">Graphing the Norwegian company ownership structure</a></div>
- <div class="date">15th June 2015</div>
- <div class="body"><p>It is a bit work to figure out the ownership structure of companies
-in Norway. The information is publicly available, but one need to
-recursively look up ownership for all owners to figure out the complete
-ownership graph of a given set of companies. To save me the work in
-the future, I wrote a script to do this automatically, outputting the
-ownership structure using the Graphviz/dotty format. The data source
-is web scraping from <a href="http://www.proff.no/">Proff</a>, because
-I failed to find a useful source directly from the official keepers of
-the ownership data, <a href="http://www.brreg.no/">Brønnøysundsregistrene</a>.</p>
-
-<p>To get an ownership graph for a set of companies, fetch
-<a href="https://github.com/petterreinholdtsen/brreg-norway-ownership-graph">the code from git</a> and run it using the organisation number. I'm
-using the Norwegian newspaper Dagbladet as an example here, as its
-ownership structure is very simple:</p>
-
-<pre>
-% time ./bin/eierskap-dotty 958033540 > dagbladet.dot
-
-real 0m2.841s
-user 0m0.184s
-sys 0m0.036s
-%
-</pre>
-
-<p>The script accept several organisation numbers on the command line,
-allowing a cluster of companies to be graphed in the same image. The
-resulting dot file for the example above look like this. The edges
-are labeled with the ownership percentage, and the nodes uses the
-organisation number as their name and the name as the label:</p>
-
-<pre>
-digraph ownership {
-rankdir = LR;
-"Aller Holding A/s" -> "910119877" [label="100%"]
-"910119877" -> "998689015" [label="100%"]
-"998689015" -> "958033540" [label="99%"]
-"974530600" -> "958033540" [label="1%"]
-"958033540" [label="AS DAGBLADET"]
-"998689015" [label="Berner Media Holding AS"]
-"974530600" [label="Dagbladets Stiftelse"]
-"910119877" [label="Aller Media AS"]
-}
-</pre>
-
-<p>To view the ownership graph, run "<tt>dotty dagbladet.dot</tt>" or
-convert it to a PNG using "<tt>dot -T png dagbladet.dot >
-dagbladet.png</tt>". The result can be seen below:</p>
-
-<img src="http://people.skolelinux.org/pere/blog/images/2015-06-15-ownership-graphs-norway-dagbladet.png" width="80%">
-
-<p>Note that I suspect the "Aller Holding A/S" entry to be incorrect
-data in the official ownership register, as that name is not
-registered in the official company register for Norway. The ownership
-register is sensitive to typos and there seem to be no strict checking
-of the ownership links.</p>
-
-<p>Let me know if you improve the script or find better data sources.
-The code is licensed according to GPL 2 or newer.</p>
-
-<p>Update 2015-06-15: Since the initial post I've been told that
-"<a href="http://www.proff.dk/firma/carl-allers-etablissement-aktieselskab/københavn-v/hovedkontorer/13624518-3/">Aller
-Holding A/S</a>" is a Danish company, which explain why it did not
-have a Norwegian organisation number. I've also been told that there
-is a <a href="http://www.brreg.no/automatiske/webservices/">web
-services API available</a> from Brønnøysundsregistrene, for those
-willing to accept the terms or pay the price.</p>
-</div>
- <div class="tags">
-
-
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn</a>.
-
-
- </div>
- </div>
- <div class="padding"></div>
-