By Rachel Armstrong and Tom Wilson (Reuters) -London Stock Exchange Group said it was on track to achieve cost savings from the integration of data platform Refinitiv after a steady third quarter, but warned supply chain shortages could impact the timing of its technology spending. The exchange said pro forma underlying income was 1.78 billion pounds ($2.46 billion) in the three months to the end of September, up from 1.75 billion a year earlier, helped by a rise in stock trading volumes and initial public offerings. Its data and analytics unit, which houses Refinitiv, posted a 0.3% decline in pro forma income, with a dip in earnings from its Trading & Banking solutions business. "We are making excellent progress on the integration of Refinitiv and are comfortably on track to achieve 125 million pounds of cost synergies in 2021, ahead of our original phasing," Chief Executive David Schwimmer said in a statement. LSEG shares fell as much as 4.2% and were last down 3.5%.