Shares of Quantum Computing Inc. (QUBT) tumbled 5.51% in pre-market trading on Tuesday, as investors reacted to news of a significant share disposal by the company's Chief Financial Officer. The sharp decline comes amid a broader market rebound, highlighting the impact of the insider selling on investor sentiment.

According to a recent filing, Quantum Computing's CFO Christopher Boehmler sold approximately 272,400 shares for a total of $4.59 million. The transactions, conducted between June 9-11, represented about 25% of Boehmler's holdings, including equity and vested options. This substantial reduction in the CFO's stake has raised concerns among investors about the company's near-term prospects.

The insider sale is particularly notable given Quantum Computing's recent stock performance. Prior to this pre-market plunge, QUBT shares had surged an impressive 250% over the previous three months. The CFO's decision to sell a significant portion of his holdings at this time may be interpreted by some as a lack of confidence in the company's ability to maintain its recent gains, potentially prompting other investors to reassess their positions.