Tan Si-Hui bought HQ
March 19, 2026 · Form 4 insider transaction
Tan Si-Hui bought 55,000 shares of Horizon Quantum Holdings Ltd., a transaction worth N/A. The trade was recorded as grant or award and disclosed on an SEC Form 4, filed 180 days after the transaction.
Footnotes
Each stock option has an exercise price of $2.88 and is exercisable for approximately 2.43499 Class A Ordinary Shares of the Company. In aggregate, Dr. Tan's spouse's stock options, once fully vested, are exercisable for 133,924 Class A Ordinary Shares of the Company.; Of the 55,000 stock options, 37,811 stock options are currently fully vested and exercisable. The remaining stock options vest in five approximately equal quarterly installments beginning on November 20, 2026, subject to Dr. Tan's spouse's continued employment with the Company.; As a result of the closing of the Company's business combination on March 19, 2026, Dr. Tan's spouse's 55,000 Legacy Horizon stock options were exchanged for 55,000 stock options of the Company of an equivalent economic value, with an exercise price per Class A Ordinary Share of $2.88.