By Sinead Cruise and Tommy Wilkes
LONDON (Reuters) - Some of the world's largest asset managers are cutting ties to credit rating agencies, potentially signaling the beginning of the end of their grip on global financial markets.
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Managers responsible for billions of euros of fixed income investments are reviewing relationships with the likes of Fitch Ratings, Standard & Poor's and Moody's Investors Service, whose calls on Portugal, Ireland and the United States have roiled central banks desperate to avert a collapse of the Euro zone.
Fund firms contacted by Reuters said rating agency research tended to be backward-looking and superficial, and often encouraged the kind of speculation that has recently dragged down Italy, one of the world's largest government bond issuers.
A broad push for development of proprietary research teams shows credit ratings agencies have never fully regained the trust of some of their most important buy-side clients, some of whom are still counting the costs of belated warnings of a change in the risk profile of debt issuers.
Relations have cooled even further in 2011 as the increasing probability of a European sovereign debt default threatens to kick a feeble economic recovery sharply into reverse.
European Commission President Jose Manuel Barroso has said Europe was looking at ways to curb the power of the mainly U.S. based agencies and was weighing possibilities for legal redress after Moody's downgrade of Portugal's debt.
Pre-crisis, Pimco, the world's largest bond investor, used to limit its own internal ratings to private corporations. In 2008 it extended this to Western sovereign credits and now runs its own internal ratings system for all issuers of debt.
"We know what's inside what we rate," he added.
Daniel Noonan, a New York-based spokesman at Fitch said his company advised investors to use its ratings and commentary alongside a range of inputs when making investment decisions.
"We think over-reliance on any single input, including a credit rating, is unwise. We continue to see strong demand for our opinions and products, and as a result our business is growing," he said.
"Investors are undoubtedly doing more of their own research, which we think is appropriate. However, they still need benchmarks to support their research efforts," added Michael Privitera, a member of S&P's Valuation and Risk Strategies team.
While credit rating agencies may be losing influence on the investment decisions of the world's largest asset managers, sudden ratings calls can still trigger massive sell-offs from passively-managed funds which track an index whose composition is shaped by the ratings given by the credit agencies.
When a country's debt is downgraded below investment grade it is pushed out of an index, forcing passive investors to sell their holdings and crystallize hefty losses that could shrink when the immediate rush for the exit subsides.
"Mutual fund managers can decide at any time to change a benchmark if he or she believes that is in the best interest of the client. For passive funds, you will have to inform all your investors and distributors and change the prospectus but if you feel strongly there is benefit to doing it, it can be done."
Some investors say credit default swap prices -- the cost of insuring debt against default -- are a much better measure of risk than credit ratings.
Data from Markit showed the 5-year CDS rate for Irish debt, for example, had shot up more than 220 points to more than 940 in the week ending July 8 -- the week before Moody's slashed the country's credit rating to junk status, warning the debt-laden country would likely need a second bailout.
(Editing by Jon Loades-Carter and Alexander Smith)
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