Investment funds that manage more than $100 billion in assets may be labeled too big to fail, global regulators said, as they seek to expand financial safeguards beyond banks and insurers.

Hedge funds with trading activities exceeding a set value of $400 billion to $600 billion would also be assessed by national authorities to gauge whether they need extra rules because their collapse could spark a crisis, the Financial Stability Board said.

The board, based in Basel, Switzerland, said it will seek opinions on its proposals until April 7.