As if the general public hadn’t lost enough faith in the stock market with recent revelations of rigged deal-making that benefits only a few, a new study shows that 25 percent of all M&A deals between public companies involve some kind of insider trading. The study, conducted by McGill University and New York University, looked at informed trading activity in equity options prior to the announcement of corporate deals. The study’s abstract states: For the target companies, we document pervasive directional options activity, consistent with strategies that would yield abnormal returns to investors with private information. This is demonstrated…