While I am not familiar with the complete catalogs, the rosters of Contemporary and Fantasy seem to be predominantly white artists.
When I think of African American west coast jazz musicians or African American-led west coast jazz sessions, I think of Hampton Hawes, Gerald Wilson, the Nat King Cole Trio, Curtis Amy, Dupree Bolton, Harold Land, Curtis Counce, Jimmy Bond, Leroy Vinegar and the early-ish Eric Dolphy sessions.
Maybe a dumb question, but did this reflect west coast demographics at the time or stylistic biases? Or did these labels overtly favor white artists? I suspect the latter, but have never really looked into this before.
I have both of the Savoy "Black California" collections, and while there are some familiar names on these, I don't know if some of those musicians lived in LA or simply recorded some sessions while they were in town.