Tan Si-Hui's Form 4 filing
Horizon Quantum Holdings Ltd. (HQ) · filed Sep 15, 2026
- Accession no.
- 0001213900-26-100280
- Filed
- Sep 15, 2026, 9:31 PM ET
- Trade date
- Mar 19-Sep 12, 2026
- Filing delay
- 180 daysLate
- Rule 10b5-1 plan
- Not checked
This filing lists 3 non-derivative transactions and 3 derivative transactions. It was filed 180 days after the trade, past the 2-business-day deadline.
Reporting owners
A Form 4 can have several reporting owners, such as a person and a fund they control. Trade tables show the first one.
| Owner | Relationship to the company |
|---|---|
| Tan Si-HuiCIK 0002120880 | Officer (Chief Science Officer) |
Non-derivative securities (Table I)
Acquisitions and disposals of common stock and similar shares, one row per line on the filing.
| Trade date | Security | Transaction | Shares | Price | Value | Shares after | Ownership | Flags |
|---|---|---|---|---|---|---|---|---|
| Aug 20, 2026 | Class A Ordinary Shares | AGrant or awardAcquired | +3,600 | $0.00 | $0 | 3,600 | Indirect | |
| Sep 12, 2026 | Class A Ordinary Shares | MOption exerciseAcquired | +5,728 | $0.00 | $0 | 5,728 | Direct | |
| Sep 12, 2026 | Class A Ordinary Shares | DReturned to the companyDisposed | −2,991 | $15.22 | −$45,523.02 | 2,737 | Direct |
Derivative securities (Table II)
Options, warrants, restricted stock units and similar. Shares are the underlying shares; price and value are for the derivative itself, and the holding after is in derivative units.
| Trade date | Security | Transaction | Underlying shares | Unit price | Value | Held after | Ownership | Flags |
|---|---|---|---|---|---|---|---|---|
| Mar 19, 2026 | Class A Ordinary Shares | AGrant or awardAcquired | +133,924 | – | – | 55,000 | Indirect | |
| Jun 12, 2026 | Class A Ordinary Shares | AGrant or awardAcquired | +91,659 | $0.00 | $0 | 91,659 | Direct | |
| Sep 12, 2026 | Class A Ordinary Shares | MOption exerciseAcquired | +5,728 | $0.00 | $0 | 85,931 | Direct |
Footnotes
Livermore does not store Form 4 footnotes. For price ranges, how indirect holdings are held and trading plan details, read the original on SEC EDGAR.