The chief executive of New Jersey’s fourth-largest biotech company resigned on Monday, done in by backdated executive stock options that have sparked a shareholders suit, a grand jury subpoena and a Securities and Exchange Commission investigation.

Medarex Inc., of Princeton, N.J., joins a growing list of businesses, including McAfee Inc. and Monster Worldwide Inc., where a CEO has stepped down in the wake of stock-option-related litigation and regulatory investigations.