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Aktienführer Knowledge Graph

The Aktienführer (AKF) Knowledge Graph is free and open. It contains structured (meta)data for the German listed stock companies from the Hoppenstedt-Aktienführer from 1956 to 2018. The metadata includes official company names with time ranges, company identifiers (ISIN and WKN) and Aktienführer IDs.

• official name
  • start time
  • end time
• ISIN
• WKN
• Aktienführer ID
  • point in time

We enriched metadata via entity linking with other databases: Creditreform, Bureau van Dijk Orbis, GND and Wikidata. The knowledge graph contains 342 external identifiers representing various databases, including the valuable company databases:

• Crefo number
• BvD ID
• Orbis ID
• Handelsregisternummer
• PM20 folder ID
• European VAT number
• D&B Hoovers company profile
• Bloomberg company ID
• ROR ID
• Legal Entity Identifier (LEI)
• Google Knowledge Graph ID
• PermID
• OpenSanctions ID
• LinkedIn organization ID
• German Lobbyregister ID
• North Data ID
• OpenCorporates ID

Access to AKF (meta)data

The AKF (meta)data is accessible by both humans and machines.

• License:
• List of properties
• List of items
• Advanced search for items
• SPARQL endpoint
• API
• Export to CSV
• Every entity can be downloaded in .json, .rdf, .ttl, .nt and .jsonld formats. An example for BASF: https://akf.kgi.uni-mannheim.de/entity/Q425.json, https://akf.kgi.uni-mannheim.de/entity/Q425.rdf, https://akf.kgi.uni-mannheim.de/entity/Q425.ttl, https://akf.kgi.uni-mannheim.de/entity/Q425.nt and https://akf.kgi.uni-mannheim.de/entity/Q425.jsonld.

Use Cases

• Searching identifiers of German companies for the period 1956-2018
• Matching your (meta)data to AKF companies
• Clean your tabular data and match it to the AKF knowledge graph with OpenRefine
• Semantic annotation of tabular data using the AKF knowledge graph with bbw
• Federated queries over AKF, Wikidata and other SPARQL endpoints

Get involved

• You can contribute to this project in various ways: matching data, data quality checks and data editing/upload.
• You can get an account here via email request to the Research Data Center at UB Mannheim. Please write "Request an account at the AKF KG" as a subject.
• If you are new to knowledge graphs, check out materials at Wikibase Knowledge Graphs.
• The AKF knowledge graph is based on Wikibase, the software behind Wikidata. Therefore the Wikidata tutorials are also highly recommended.

External Resources

• AKF OCR-ed texts
• AKF Structured Database with full data: Restricted access for research purposes only
• Hoppenstedt Aktienführer at Wikipedia
• Gehrlein, Sabine et al.: Vom Papier zur Datenanalyse. „Neue“ historische Forschungsdaten für die Wirtschaftswissenschaften, in: E-Science-Tage 2019: Data to Knowledge, Heidelberg: heiBOOKS, 2020. https://doi.org/10.11588/heibooks.598.c8423