Why Oberweis hasn't filed its 13G?

[gatesxzp]

Based on Bloomberg's information, "Oberweis Asset Management Inc. increased its holding to 1.8 million shares of NQ Mobile, from 990,894 on Sept. 30, he said in a telephone interview on Nov. 18 from Lisle, Illinois. This would make the firm the second-largest shareholder with a 5.8 percent stake, according to data compiled by Bloomberg. "

Since Oberweis' holding of NQ has already exceeded 5%, why it hasn't filed its 13G so far? I can't find its 13G filing on SEC's website: http://www.sec.gov/edgar/searchedgar/companysearch.html

[Mountainbiker]

Based on Bloomberg's information, "Oberweis Asset Management Inc. increased its holding to 1.8 million shares of NQ Mobile, from 990,894 on Sept. 30, he said in a telephone interview on Nov. 18 from Lisle, Illinois. This would make the firm the second-largest shareholder with a 5.8 percent stake, according to data compiled by Bloomberg. "

Since Oberweis' holding of NQ has already exceeded 5%, why it hasn't filed its 13G so far? I can't find its 13G filing on SEC's website: http://www.sec.gov/edgar/searchedgar/companysearch.html

We will all find out the names of all holders who sold or bought  for the peirod ended on Dec 31, 2013, in Jan 2014.