By Hyunjoo Jin and Akriti Sharma (Reuters) -Tesla Inc Chief Executive Officer Elon Musk sold $8.5 billion worth of shares in the electric vehicle maker, U.S. securities filings showed, in sales likely aimed at helping finance his planned purchase of Twitter Inc. Musk said in a tweet on Thursday that there are “no further TSLA sales planned after today”. He sold about 9.6 million shares this week, according to the filings on Thursday and Friday, equating to 5.6% of his stake in the company. It was not clear whether all of Musk’s recent Tesla share sales were reported. Tesla did not immediately …