bsym

Bloomberg Open Symbology data since 2012 along with mappings to exchange tickers, ISINs and other financial data resources.

For scripts, ontologies and example queries see the bsym project at github.

Edit:
The Bloomberg bsym identifiers have been superseded by FIGI, the Financial Instrument Global Identifier, see http://openfigi.com/ for more information.

Consequently, we created a new dataset figi following Bloomberg's move, see http://datahub.io/dataset/figi

Data here is left as is for historical purposes.