AIJ Investment Advisors Co., suspended by financial regulators, told investors one of its funds returned 241 percent since it started in May 2002 by mainly trading Nikkei 225 options, according to a newsletter obtained by Bloomberg News.

The Financial Services Agency on Friday ordered the Tokyo-based firm with ¥183.2 billion in client money to stop business for a month as the regulator investigates possible losses at AIJ's hedge funds.

AIJ's AIM Millennium fund returned 3.9 percent in the six months through last September, according to the four-page October 2011 newsletter in Japanese. That compares with an 11 percent decline in the Nikkei 225 stock average and 12 percent retreat in the broader Topix index.