** Shares in Tryg TRYG.CO fall around 4% after the Danish Competition Council said on Tuesday it was considering launching a "market investigation" into non-life insurance companies
** "Investors gravitate to Nordic insurers as safe-haven plays, and uncertainty undermines this," Citi says, downgrading Tryg to "neutral" from "buy"
** Tryg appears to be the most exposed to this situation, as 47% of its revenues and 65% of its premiums in private lines originate from Denmark, the broker says
** The possible investigation into retail P&C pricing tactics could span years, implying no immediate economic impact but potentially significant long-term effects, Citi says
** There is a risk these concerns could also spread to other Nordic markets, which suggests regulators may be looking into excessive margins in insurance, the broker adds
(Reporting by Agnieszka Olenska)
((Agnieszka.Olenska@thomsonreuters.com;))