I bought these in 2000 when they were Parthus Technologies PLC, I still have the certificate ( now worthless ) , subsequently in 2002 they became ParthusCeva, Inc, I also have a certificate for this, the shares began trading on Nasdaq and the LSE on November 1 2002 Parthis becoming a wholly owned dubsidiary of ParthusCeva.
Now I also have a nominee account and I also hold a small number of shares in that account with the broker which are definitely easily tradable however my understanding is that if you deliver a share certificate for a traded company then they will sell your shares and ParthusCeva are still trading..