Trump Media, the company behind Truth Social, is currently the most expensive U.S. stock to short sell, according to financial data from S3 Partners. Short sellers would have to pay annual borrowing costs of 750 to 900% of the stock price to open a new short position on April 3rd. Existing short positions in Trump Media stock have borrowing costs of around 565% annually. Short selling Trump Media stock is becoming more challenging and expensive, as nearly all available shares have already been borrowed, exacerbating the high costs.