SAN FRANCISCO—Tesla Inc. Chief Executive Elon Musk said on Wednesday he was “almost done” with his stock sales after selling over $15 billion worth for more than one month. The billionaire had made confusing statements as to whether he might or might not be done with his stated goal of selling 10 percent of his Tesla shares. “I sold enough stock to get to around 10 percent plus the option exercise stuff and I tried to be extremely literal here,” he said in an interview on Tuesday with conservative satirical website Babylon Bee. But on Wednesday he suggested he might not be done. “This assumes completion of the 10b sale,” he wrote on Twitter, referring to his prearranged sales plan related to his options. “There are still a few tranches left, but almost done,” he wrote on Twitter later. Under the Rule 10b5-1 trading plan set up in September, he …