Shares of Sorrento Therapeutics (NASDAQ:SRNE) fell on Wednesday after the biopharmaceutical company fired its chief financial officer. By the close of trading, Sorrento's stock was down 9.9%.

After the market close on Tuesday, Sorrento disclosed in a Securities and Exchange Commission (SEC) filing that it had terminated CFO Jiong Shao's employment, effective immediately. 

Sorrento said Najjam Asghar, who has served as the biotech company's chief accounting officer since June 2019, would replace Shao as CFO until a long-term successor is found.

Experienced investors know that it's rarely a good thing when a company fires its chief financial officer. Such a move often signifies that the CEO and board of directors are unhappy with the company's decision-making as it relates to key financial matters -- and it could be a sign of mounting problems that have not yet been disclosed to shareholders. Many of Sorrento's investors apparently decided to sell their shares today rather than wait for any potential bad news to be announced.

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