HQ · Insider Trading
Horizon Quantum Holdings Ltd. Class A Ordinary Shares
Every open-market purchase and sale reported by HQ officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-21 | Catherine Michele Fitzsimons | CLO and CCO | A | +601,932 deriv. | — |
| 2026-09-16 | Qian Yi Amanda Chew | Chief Product Officer | A | +17,857 deriv. | — |
| 2026-09-15 | Joseph Francis Fitzsimons | Chief Executive Officer | MIXED | +10,883 | −$52.33K |
| 2026-09-15 | Catherine Michele Fitzsimons | CL and CO | MIXED | +1,026 | −$17.08K |
| 2026-09-15 | Greg Gould | Chief Financial Officer | MIXED | +2,165 | −$19.36K |
| 2026-09-15 | Si-Hui Tan | Chief Science Officer | MIXED | +6,337 | −$45.52K |
| 2026-03-25 | Greg Gould | Chief Financial Officer | A | +285,300 deriv. | — |
| 2026-03-25 | Si-Hui Tan | Chief Science Officer | A | +500,000 deriv. | — |
| 2026-03-25 | Danielle Lambert | Director | Buy | +84,602 | +$1000.00K |
| 2026-03-24 | Joseph Francis Fitzsimons | Chief Executive Officer | A | +19,744,585 | — |
| 2026-03-20 | Harry L. You | Director | A | +1,163,484 | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Harry L. You | Director | 1,212,698 | $18.58M |
| Danielle Lambert | Director | 84,602 | $1.30M |
| Joseph Francis Fitzsimons | Chief Executive Officer | 14,321 | $219.40K |
| Si-Hui Tan | Chief Science Officer | 9,328 | $142.90K |
| Greg Gould | Chief Financial Officer | 2,165 | $33.17K |
| Catherine Michele Fitzsimons | CLO and CCO | 1,026 | $15.72K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the HQ quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.