Four publicly listed dry bulk shipping companies will join an elite few other shipping companies as part of a broad index measuring the value of the US stock market.

But the annual rebalancing of the equity index also saw a number of offshore companies get dropped, including John Fredriksen's Seadrill. 

The Russell 3000 Index added Eagle Bulk Shipping, Genco Shipping & Trading, Navios Maritime Holdings, and Safe Bulkers as part of its annual index reconstitution issued on Friday.