For most people working at sea, stock ownership is rarely part of the job. For 27-year-old Maryellyn Musselman, it could be life-changing.

When SpaceX makes its debut on Wall Street, thousands of current and former employees will become overnight millionaires.

For most people working at sea, stock ownership is rarely part of the job. For 27-year-old Maryellyn Musselman, it could be life-changing.