JPMorgan’s Jamie Dimon and Tesla’s Elon Musk Feud Behind the Scenes

Elon Musk and Jamie Dimon don’t get along.

Mr. Musk has spurned Mr. Dimon’s JPMorgan Chase & Co. for years, turning to other banks while expanding Tesla Inc. and his broader empire. Conversations over the years between the two companies have often upset one side or the other, according to people familiar with the matter.