The Buy rating and price target announcement by B. Riley Securities for Ares Capital (NASDAQ:ARCC) is likely to have a positive short-term impact on the stock price. The Buy rating indicates that the analyst believes the stock has potential for growth, and the price target of $20.5 suggests an upside potential from the current price. This news is highly relevant and important for investors in ARCC, as it provides a positive outlook on the stock from a reputable analyst.