Why did Plug Power stock tumble today and is it a buying opportunity?

Core Viewpoint - Plug Power Inc. (NASDAQ: PLUG) experienced a nearly 20% decline in share price following the announcement of a $375 million convertible notes offering, indicating investor concerns regarding the company's financial strategy and market confidence [1] Company Summary - The company is a specialist in hydrogen fuel cell technology and has recently initiated a convertible notes offering valued at $375 million, which has led to significant sell-off by investors [1] - The market reaction suggests a lack of confidence in the company's current financial health and future prospects, as evidenced by the sharp drop in share price [1]