SHANGHAI, Feb 20 (Reuters) - China's Shenzhen stock exchange said on Monday it was temporarily restricting trading by hedge fund manager Lingjun Investment as a penalty for what it said was "abnormal trading".

The fund's program-generated order to sell stocks in early trade on Monday coincided with a quick decline in the Shenzhen market, the bourse said in a statement.

The Shenzhen exchange said it would restrict Lingjun's trading until Feb. 22. (Reporting by Shanghai Newsroom; Editing by Andrew Heavens)