The appointments coincide with news of rival FTSE Group's hiring of its inaugural communications director (PRWeek, 11 October).
The group appointed Marianne Huve-Allard to the newly created role of comms director for the company, which is a joint venture between The Financial Times and the London Stock Exchange.
At Dow Jones, Simona Deckers and Stephanie Schleidt, both of whom have comms backgrounds in European markets, are joining the group's PR team as associates.
The move doubles the size of the global PR team, which had been limited to two people in New York, and forms part of an increased European marketing push.
While Dow Jones fights through a troublesome ad recession in its core publishing business, the company's index licensing arm has become lucrative in recent years, as index investing has come into fashion.
Index investors attempt to exactly mirror the performance of a given stock index by investing solely in the stocks that comprise that index.
Index investing has proven to be a cost-effective and fail-safe way for investors to match the performance of the broad market.
Companies such as Dow Jones make money by licensing indexes for use in index-investment products.
Dow Jones Indexes global director of PR Sybille Reitz said: 'Although index investing is pretty much old hat in the US, it's just starting to catch on in Europe.
'Yet in many ways, Europe is a more complicated market for us because of the various media markets, regulators, and stock markets within Europe,' she added.