Severance for some but not others, is there any legal recourse

The nursing home chain I worked for was recently sold to an investment firm. They only wanted the property and turned around and hired 4 different companies to manage and run the nursing homes. One of these management companies was started by four vps from the former company. The compan y that was sold offered severance to the displaced workers that stayed until the sale date but had stated that any hired by the new company started by the vps would not receive severance.
Now that the sale is complete and as required for disclosure purposes, a list of all positions in the old company was distributed to those that stayed to the end but didn't have positions with the new company. The list showed who or what positions would or would not receive a severance. All of the top executives (director or vp and above) were all on the list of those getting severance as well as several others in middle management positions.
For those of us that took positions with the new company but were not on the list of those getting severence do we have any legal recourse? Or should I simply sue my now former employer for the 19 years of overtime I never got paid for?