Oct. 21 (Bloomberg) -- Denmark, home to the world’s top-ranked pension system, will toughen oversight of the $500 billion industry after regulators observed a surge in risk-taking linked in part to more widespread use of hedge funds.

The Financial Supervisory Authority in Copenhagen will require pension funds to submit quarterly reports on their alternative investments to track their use of hedge funds, exposure to private equity and infrastructure projects. The decision follows funds’ failures to account adequately for risks in their investment strategies, according to the FSA.

The regulatory clampdown comes as Denmark deals with risks it says are inherent to a system due to be introduced across the European Union in 2016. The new rules will allow pension funds to invest according to a so-called prudent person model, rather than setting outright limits. In Denmark, the approach has proven problematic for the only EU country to have adopted the model, said Jan Parner, the FSA’s deputy director general for pensions.