The world’s rich­est man just be­came its first tril­lion­aire.

Shares in Elon Musk’s rock­et com­pa­ny SpaceX soared 25% af­ter open­ing for trad­ing at noon Fri­day, an aus­pi­cious start for his­to­ry’s biggest ini­tial pub­lic of­fer­ing and enough to push the net worth of its founder and CEO over the tril­lion dol­lar mark.

The shares opened at $150, then shot to $168.90 around 12:.50 p.m. ET. That price gave the com­pa­ny a mar­ket val­ue of $2.21 tril­lion. Musk, who al­so is a ma­jor share­hold­er and CEO of Tes­la, is now worth an es­ti­mat­ed $1.1 tril­lion, ac­cord­ing to Forbes.