Shares of RIM stock have taken a beating since the company announced devastating first-quarter earnings last Thursday. The Waterloo, Ontario-based BlackBerry maker missed Wall Street’s first-quarter consensus, it lowered its full-year guidance, it announced workforce reductions, it confirmed product delays and investors went running for the door as did a top executive. Since the earnings release last week, RIM’s stock has fallen more than 25%. This is bad news for every RIM investor, but two in particular must be especially upset. RIM Co-CEOs Mike Lazaridis and Jim Balsillie collectively own more than 10% of the company, a stake that helped each man achieve billionaire status. Last year, Lazaridis was ranked the world’s 651st richest man by Forbes with a net worth of $1.9 billion, and Balsillie was No. 692 on the list with a net worth of $1.8 billion. Fast forward to today, and neither man can call himself a billionaire any longer. The cheifs’ stake in the company is still worth more than $1 billion combined, but separately, their net worths are now just roughly $800 million a piece. We doubt the employees set to be laid off in the coming weeks and months will shed any tears for the Co-CEOs’ loss, but it’s just another piece of a puzzle that continues to fall apart. Some analysts believe RIM is hardly out for the count, however, and we agree that the company has a bit of fight left in it. If Balsillie and Lazaridis hope to rejoin the billionaire club, it’s time to put those gloves on and start swinging.