The funds would be used to meet certain margin calls and would give Thornburg a reprieve from having to meet others.

The agreement was made with five parties providing Thornburg $5.8 billion in financing.

Also Friday, the company changed its bylaws to remove a limit on the amount of stock investors are allowed to hold.

In a filing with the Securities and Exchange Commission, Thornburg said it opted out of certain protections of the Maryland Control Share Acquisition Act, which places limits on the amount of stock a person can own.

Thornburg shares closed the regular session up 17 cents, or 12 percent, at $1.65, but dropped 40 cents, or 24 percent, after-hours to $1.25.