Determine the sentiment expressed in the news from financial perspective.
Options: negative, positive

Shares of Rivian Automotive Inc. RIVN, -12.20% tumbled 12.0% in afternoon trading toward a record low, following Ford Motor Co.'s F, -2.36% disclosure that it sold more than $200 million worth of the electric vehicle maker's stock. Ford's share sale came after the lockup agreement in Rivian's initial public offering expired on Sunday.
negative