There have been several reports around the selling of stocks by Senator Richard Burr, the chairman of the Senate Intelligence Committee as well as Senator Sen. Kelly Loeffler and others. The allegations are around the selling of the stocks before information was made public about the extent of the spread of the Corona virus, but after they had access to certain reports and information. This report on CNN Politics as well as this report on Propublica provide further details.
Also related to current times, increased market volatility can in some cases change how abuse may both be carried out and monitored for. This article by Nasdaq looks at some of those issues.
Two weeks ago, this report was published on Bloomberg Law around an investigation by the US Justice Department into possible market manipulation by high-frequency trading firm Allston Trading LLC. The article quotes a response denying any wrongdoing.
This article on Lexology by Gary DeWaal of Katten Muchin Rosenman LLP reports that four individuals formerly associated with JP Morgan and indicted for purported spoofing activities from March 2008 through August 2016 moved to dismiss their 14-count indictment on the grounds that their alleged misconduct does not constitute fraud. The case is further referenced here.
In Asia, the Dalian Commodity Exchange reported here that there were 34 investigations into abnormal transactions in February.