The exchange has moved its main UK share system to technology provided by Millenium, a Sri Lankan company it bought in 2009, making it faster and more attractive to the rapidly growing business of ultra-fast hedge fund trading. The migration on Monday is a boost for the exchange after it announced talks with Toronto-based TMX on February 8. It postponed the technology upgrade in November, when a trading glitch prompted the LSE to probe what went wrong amid speculation of sabotage. “This upgrade is important for the LSE because they can now go after the market-makers and high-frequency guys who are some of the top trading firms in Europe,” said the head of algorithmic trading at a large LSE customer.