Nasdaq · CIK 0002088256
HQ Horizon Quantum Holdings Ltd.
Insider trading from SEC Form 4. Last filing 28 d ago. Close $16.30 on Oct 9, 2026, +96% from the 52-week low and -58% from the high.
In brief
Horizon Quantum Holdings Ltd. (HQ) has 10 SEC Form 4 filings on file from 7 insiders, the latest filed on Sep 16, 2026. No insider bought or sold on the open market in the last 90 days; rows filed in that time are grants, exercises, tax withholding and other transactions that carry no view on the price.
1 open-market trade has been scored at HQ. The newest: Danielle Lambert (director) bought $1000k of stock on Mar 19, 2026, filed Mar 25, 2026, scored 48 (moderate).
Last 90 days
Price and insider trades, last year
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
Open-market buys and sells at Horizon Quantum Holdings Ltd., scored.
| Score | Insider | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 48Moderate | Danielle Lambert director buy | $1000k 84,602 shares | - | - |
Transactions
Every row filed, 25 in all.
| Date | Insider | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Aug 17, 2026 | Qian Yi Amanda Chew Chief Product Officer | AGrant or award Restricted Stock Unitderivative | +17,857 | $0.00 | $0 | 17,857 | 28 d ago |
| Sep 12, 2026 | Catherine Michele Fitzsimons CL and CO | MOption exercise Class A Ordinary Shares | +2,148 | $0.00 | $0 | 2,148 | 29 d ago |
| Sep 12, 2026 | Joseph Francis Fitzsimons Chief Executive Officer | MOption exercise Class A Ordinary Shares | +14,321 | $0.00 | $0 | 14,321 | 29 d ago |
| Aug 20, 2026 | Si-Hui Tan Chief Science Officer | AGrant or award Class A Ordinary Sharesindirect: By Spouse | +3,600 | $0.00 | $0 | 3,600 | 29 d ago |
| Sep 12, 2026 | Greg Gould Chief Financial Officer | MOption exercise Class A Ordinary Shares | +3,437 | $0.00 | $0 | 3,437 | 29 d ago |
| Sep 12, 2026 | Catherine Michele Fitzsimons CL and CO | DDisposition to issuer Class A Ordinary Shares | -1,122 | $15.22 | $17k | 1,026 | 29 d ago |
| Sep 12, 2026 | Si-Hui Tan Chief Science Officer | MOption exercise Class A Ordinary Shares | +5,728 | $0.00 | $0 | 5,728 | 29 d ago |
| Sep 12, 2026 | Greg Gould Chief Financial Officer | DDisposition to issuer Class A Ordinary Shares | -1,272 | $15.22 | $19k | 2,165 | 29 d ago |
| Sep 12, 2026 | Joseph Francis Fitzsimons Chief Executive Officer | DDisposition to issuer Class A Ordinary Shares | -3,438 | $15.22 | $52k | 10,883 | 29 d ago |
| Sep 12, 2026 | Si-Hui Tan Chief Science Officer | DDisposition to issuer Class A Ordinary Shares | -2,991 | $15.22 | $46k | 2,737 | 29 d ago |
| Jun 12, 2026 | Greg Gould Chief Financial Officer | AGrant or award Restricted Stock Unitderivative | +54,995 | $0.00 | $0 | 54,995 | 29 d ago |
| Jun 12, 2026 | Joseph Francis Fitzsimons Chief Executive Officer | AGrant or award Restricted Stock Unitderivative | +229,148 | $0.00 | $0 | 229,148 | 29 d ago |
| Jun 12, 2026 | Catherine Michele Fitzsimons CL and CO | AGrant or award Restricted Stock Unitderivative | +34,372 | $0.00 | $0 | 34,372 | 29 d ago |
| Sep 12, 2026 | Greg Gould Chief Financial Officer | MOption exercise Restricted Stock Unitderivative | +3,437 | $0.00 | $0 | 51,558 | 29 d ago |
| Mar 19, 2026 | Si-Hui Tan Chief Science Officer | AGrant or award Stock Option (Right to Buy)derivativeindirect: By Spouse | +55,000 | - | - | 55,000 | 29 d ago |
| Sep 12, 2026 | Catherine Michele Fitzsimons CL and CO | MOption exercise Restricted Stock Unitderivative | +2,148 | $0.00 | $0 | 32,224 | 29 d ago |
| Sep 12, 2026 | Joseph Francis Fitzsimons Chief Executive Officer | MOption exercise Restricted Stock Unitderivative | +14,321 | $0.00 | $0 | 214,827 | 29 d ago |
| Jun 12, 2026 | Si-Hui Tan Chief Science Officer | AGrant or award Restricted Stock Unitderivative | +91,659 | $0.00 | $0 | 91,659 | 29 d ago |
| Sep 12, 2026 | Si-Hui Tan Chief Science Officer | MOption exercise Restricted Stock Unitderivative | +5,728 | $0.00 | $0 | 85,931 | 29 d ago |
| Mar 19, 2026 | Greg Gould Chief Financial Officer | AGrant or award Stock Option (Right to Buy)derivative | +285,300 | - | - | 285,300 | Mar 25, 2026 |
| Mar 19, 2026 | Si-Hui Tan Chief Science Officer | AGrant or award Stock Option (Right to Buy)derivative | +500,000 | - | - | 500,000 | Mar 25, 2026 |
| Mar 19, 2026 | Danielle Lambert director | POpen-market purchase Class A Ordinary Sharesindirect: Penchant Family Holdings LLC | +84,602 | $11.82 | $1000k | 84,602 | Mar 25, 2026 |
| Mar 19, 2026 | Joseph Francis Fitzsimons Chief Executive Officer | AGrant or award Class B Ordinary Shares | +19,744,585 | - | - | 19,744,585 | Mar 24, 2026 |
| Mar 19, 2026 | Harry L. You director, owner | AGrant or award Class A Ordinary Sharesindirect: See footnote | +1,163,484 | - | - | 1,163,484 | Mar 20, 2026 |
| Mar 19, 2026 | Harry L. You director, owner | AGrant or award Warrantsderivativeindirect: See footnote | +2,884,660 | - | - | 2,884,660 | Mar 20, 2026 |
Insiders
Everyone who has filed a Form 4 here.
- Qian Yi Amanda ChewChief Product Officer
- Catherine Michele FitzsimonsCL and CO
- Joseph Francis FitzsimonsChief Executive Officer
- Greg GouldChief Financial Officer
- Danielle Lambertdirector
- Si-Hui TanChief Science Officer
- Harry L. Youdirector, owner, ceo, cfo, chair, officer
Questions about HQ
Answered from the filings on this page, as of the latest one.
Are insiders buying HQ?
No. In the last 90 days no insider at Horizon Quantum Holdings Ltd. bought or sold shares on the open market according to SEC Form 4 filings. The rows on file from that period are grants, exercises, tax withholding or other transactions, which carry no view on the price.
Who was the last insider to trade HQ on the open market?
Danielle Lambert (director) bought $1000k of HQ on Mar 19, 2026 and filed the Form 4 on Mar 25, 2026. InsiderTell scored 48 (moderate).
How many insiders file Form 4 at Horizon Quantum Holdings Ltd.?
7 people have filed a Form 4 at Horizon Quantum Holdings Ltd., among them Qian Yi Amanda Chew (Chief Product Officer), Catherine Michele Fitzsimons (CL and CO), Joseph Francis Fitzsimons (Chief Executive Officer). Officers, directors and holders of more than 10% of a share class must report their trades within two business days.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.