Horizon Quantum CSO RSUs vest; 2,991 shares sold
Chief Science Officer Dr. Tan Si-Hui reported RSU vesting, a cash settlement to Horizon Quantum, and significant RSU and stock option awards for herself and her spouse.
Rhea-AI Filing Summary
Horizon Quantum Holdings Ltd. (HQ) reported insider equity activity by Chief Science Officer Dr. Tan Si-Hui and her spouse. On September 12, 2026, 5,728 RSUs vested for Dr. Tan, converting into an equal number of Class A Ordinary Shares, followed by a disposition of 2,991 shares to the company for cash settlement at $15.22 per share. Earlier, on June 12, 2026, Dr. Tan received a grant of 91,659 RSUs that vest in sixteen approximately equal quarterly installments. Dr. Tan’s spouse received a grant of 3,600 RSUs on August 20, 2026, vesting over time, and holds 55,000 stock options with a $2.88 exercise price, exercisable in aggregate for 133,924 Class A Ordinary Shares, a portion of which is already vested and the remainder vesting in quarterly installments.
Positive
- None.
Negative
- None.
Insider Trade Summary
5,728 shares exercised/converted
Exercise
6 txns
Insider
Tan Si-Hui
Role
Chief Science Officer
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Restricted Stock Unit F2, F3, F4 | 5,728 | $0.00 | $0.00 |
| Exercise | Class A Ordinary Shares F3, F4 | 5,728 | $0.00 | $0.00 |
| Disposition | Class A Ordinary Shares F5 | 2,991 | $15.22 | $46K |
| Grant/Award | Class A Ordinary Shares F1, F2 | 3,600 | $0.00 | $0.00 |
| Grant/Award | Restricted Stock Unit F2, F4 | 91,659 | $0.00 | $0.00 |
| Grant/Award | Stock Option (Right to Buy) F6, F7, F8 | 55,000 | -- | -- |
Holdings After Transaction:
Stock Option (Right to Buy) — 55,000 contracts (Indirect, By Spouse);
Restricted Stock Unit — 177,590 contracts (Direct);
Class A Ordinary Shares — 3,600 shares (Indirect, By Spouse);
Class A Ordinary Shares — 2,737 shares (Direct)
Footnotes (8)
- F1. On August 20, 2026 (the "August Grant Date"), Dr. Tan's spouse was granted a total of unvested 3,600 RSUs. The RSUs granted to Dr. Tan's spouse are subject to his continued employment with the Company and vest in accordance with the following schedule: One quarter (1/4) of the total number of RSUs vest on the first anniversary of the August Grant Date with the remaining three quarters (3/4) vesting in twelve approximately equal quarterly installments on 20th day of each fiscal quarter.
- F2. Each restricted stock unit ("RSU") represents a contingent right to receive one Class A ordinary share, with no par value ("Class A Ordinary Share"), of Horizon Quantum Holdings Ltd. (the "Company") upon vesting, for no consideration.
- F3. On September 12, 2026, 5,728 of Dr. Tan's RSU's vested.
- F4. On June 12, 2026 (the "June Grant Date"), Dr. Tan was granted a total of 91,659 unvested RSUs. The RSUs granted to Dr. Tan vest in sixteen approximately equal installments on successive quarterly anniversaries of the June Grant Date and are subject to Dr. Tan's continued employment with the Company through each applicable vesting date.
- F5. The reported disposition to the Company reflects the settlement in cash of a portion of the RSUs which vested on September 12, 2026, at a price per ordinary share of $15.22, the last reported sales price of the Company's Class A Ordinary Shares on September 11, 2026.
- F6. 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.
- F7. 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.
- F8. 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.
Key Figures
RSUs vested: 5,728 units
Shares disposed to issuer: 2,991 shares
Cash settlement price: $15.22 per share
+5 more
8 metrics
RSUs vested
5,728 units
RSUs vested for Dr. Tan on September 12, 2026
Shares disposed to issuer
2,991 shares
Cash settlement of portion of vested RSUs on September 12, 2026
Cash settlement price
$15.22 per share
Price used for settlement to Horizon Quantum, based on September 11, 2026 last sale
RSU grant to Dr. Tan
91,659 units
Unvested RSUs granted on June 12, 2026, vesting over sixteen quarterly installments
RSU grant to spouse
3,600 units
Unvested RSUs granted to Dr. Tan’s spouse on August 20, 2026
Spouse’s stock options
55,000 options
Options indirectly owned by Dr. Tan through spouse
Option exercise price
$2.88 per share
Exercise price of spouse’s stock options exercisable for Class A Ordinary Shares
Underlying shares for options
133,924 shares
Total Class A Ordinary Shares exercisable from spouse’s stock options when fully vested
Key Terms
Restricted Stock Unit, Class A Ordinary Shares, stock options, exercise price, +1 more
5 terms
Restricted Stock Unit financial
"Each restricted stock unit ("RSU") represents a contingent right to receive"
A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.
stock options financial
"Dr. Tan's spouse's 55,000 Legacy Horizon stock options were exchanged"
Stock options are agreements that give a person the right to buy or sell a company's stock at a specific price within a certain time frame. They are often used as a reward or incentive, similar to a coupon that can be used later if the stock price rises, allowing the holder to make a profit.
exercise price financial
"Each stock option has an exercise price of $2.88 and is exercisable"
The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.
business combination financial
"As a result of the closing of the Company's business combination on March 19, 2026"
A business combination happens when two or more companies join together to operate as one, like two friends merging their teams into a single group. This is important because it can change how companies grow, compete, and make money, often making them bigger and more powerful in the market.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What insider transactions did HQ’s Chief Science Officer report on September 12, 2026?
On September 12, 2026, 5,728 RSUs held by Dr. Tan vested into Class A Ordinary Shares, and 2,991 shares were disposed of to Horizon Quantum Holdings Ltd. for cash settlement at $15.22 per share for a portion of the vested RSUs.
What RSU grant did HQ’s Dr. Tan receive on June 12, 2026?
On June 12, 2026, Dr. Tan received a grant of 91,659 unvested RSUs. These RSUs vest in sixteen approximately equal installments on successive quarterly anniversaries of the June Grant Date, subject to her continued employment with Horizon Quantum Holdings Ltd.
What RSU grant did the spouse of HQ’s Chief Science Officer receive?
On August 20, 2026, Dr. Tan’s spouse was granted 3,600 unvested RSUs. One quarter vests on the first anniversary of the August Grant Date, and the remaining three quarters vest in twelve approximately equal quarterly installments, subject to Dr. Tan’s continued employment.
What are the terms of the spouse’s stock options reported for HQ?
Dr. Tan’s spouse holds 55,000 stock options with an exercise price of $2.88 per option, exercisable in aggregate for 133,924 Class A Ordinary Shares. 37,811 options are currently vested and exercisable, with the remainder vesting in five quarterly installments beginning November 20, 2026.
How was the cash settlement of Dr. Tan’s RSUs to Horizon Quantum determined?
The disposition of 2,991 shares to Horizon Quantum reflects cash settlement of part of the RSUs vested on September 12, 2026, at $15.22 per share, which is described as the last reported sales price of the company’s Class A Ordinary Shares on September 11, 2026.
Were HQ insider transactions reported as made under a Rule 10b5-1 trading plan?
No. The filing’s Rule 10b5-1 checkbox is reported as false, and the footnotes do not state that any of the reported transactions for Dr. Tan or her spouse were made pursuant to a Rule 10b5-1 or similar pre-arranged trading plan.
AI-generated analysis. How Rhea-AI works. Not financial advice.
