“There were a few cases where one company was doing considerably better than another, and I borrowed money,” he said in the interview. Mr. Musk defends the moves as consistent with his philosophy that “if I ask investors to put money in, then I feel morally I should put money in as well,” Mr. Musk said. “I should not ask people to eat from the fruit bowl if I have not myself been willing to eat from the fruit bowl.” Mr. Musk said it is “important that there not be some sort of house of cards that crumbles if one element of the pyramid of Tesla, SolarCity and SpaceX falters.” He said his loans aren’t risky to shareholders because they add up to less than 5% of his total net worth, which exceeds $10 billion. That figure doesn’t include Mr. Musk’s large stake in SpaceX, which is private. He said he could easily put up more SpaceX or Tesla shares as collateral if needed. “The odds that a margin call cannot be addressed are almost zero,” Mr. Musk said in the interview.