NEW YORK ( TheStreet) -- Capital IQ , which provides market-data services, is buying smaller rival TheMarkets.com for $300 million, the Wall Street Journal reports, citing people familiar with the matter. TheMarkets.com is a joint venture of several Wall Street banks, including JPMorgan Chase ( JPM) and Goldman Sachs ( GS). It was formed in 2000 as a way to provide banks' sell-side research to institutional investors, the Journal notes. Capital IQ was purchased for $200 million in 2004 by Standard & Poor's, a unit of McGraw-Hill ( MHP). It provides data and analytical tools to investment banks, private-equity firms and other financial-services clients, the Journal says. -- Written by Joseph Woelfel >To contact the writer of this article, click here: Joseph Woelfel >To submit a news tip, send an email to: email@example.com.