Shares of Quantum Computing Inc. (QUBT) plummeted 6.27% in pre-market trading on Tuesday, following news of significant insider selling by the company's Chief Financial Officer, despite a recent product milestone. The sharp decline highlights investors' concerns about the recent insider transactions and their potential implications for the company's future prospects.

According to recent filings, Christopher Boehmler, CFO of Quantum Computing Inc., sold approximately 272,400 shares for a total of $4.59 million between June 9-11. This transaction represented about 25% of his holdings, including equity and vested options. The substantial reduction in the CFO's stake has raised eyebrows among investors, potentially signaling a lack of confidence in the company's near-term outlook.

Ironically, the sell-off comes as Quantum Computing Inc. announced a significant product development. The company reported shipping its first commercial entangled photon source to an unnamed research institution in South Korea. This broadband entangled photon source, designed to support research in quantum networking and secure communications, operates in the C-band telecommunication range and is compatible with existing fiber optics infrastructure. However, this positive news appears to have been overshadowed by the insider selling, leading to the stock's sharp decline.