Transaction · 0001213900-26-100280

Tan Si-Hui

Tan Si-Hui, CSO, reported a transaction classified as return at Horizon Quantum Holdings Ltd. involving 2991.000000 shares for an estimated $45523.02. Reported holdings after the transaction were 2737.000000 shares. A 10b5-1 reference was not detected in the stored filing text.

returnSEC transaction code DCSO
HQHorizon Quantum Holdings Ltd.
Trade date
Sep 12, 2026
Filing date
Sep 16, 2026
View on SEC Insider profile
Disclosed value-$45.5kShares × reported price
Shares traded2.99k$15.22 per share
Holdings after2.73kDirect
% of reported position tradedUnavailableThis security and ownership context
How reported position traded is calculated

Calculated only for code-P purchases and code-S sales.

Row-level estimate for this security and ownership context, not the insider’s complete portfolio. Joint ownership, other transactions in the filing, amendments and footnotes can affect interpretation.

HQ price since this filing

Daily closing prices, with the filing date and available return windows
HQ · Daily closing priceLoading daily prices…
Filing dateReturn windows appear as prices become available.
Pre-filing1mo ago1w ago1d ago
Returns since7d +9.7%30d +2.8%90d180d1y

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
return
Code D
Identifier
0001213900-26-100280
Class A Ordinary Shares
Transaction date
Sep 12, 2026
Filed Sep 16, 2026, 01:31 AM · 4d delay
Shares
2,991 sh
$15.22 per share
Estimated value
-$45.5k
Computed from shares × price
Holdings after
2,737 sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Direct Ownership Large Holdings Reduction
Filing-only score

+6 points

Compact filing score computed from stored Form 4 facts. Version v1.

Positive filing signal

This filing has a modest positive filing-only score. Treat it as a useful flag for review, not as a buy signal.

How this score is calculated
  • direct_ownership+6 points

    direct_or_indirect_ownership = D

    Direct ownership reports the insider's personal stake.
Read the scoring methodology

Signed filing-only points, not a probability or expected return. Version v1.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

Chief Science Officer

Officer YesDirector No10% NoOther No
Footnotes & amended
  1. 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…

  2. 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") u…

  3. F3

    On September 12, 2026, 5,728 of Dr. Tan's RSU's vested.

  4. 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 anni…

  5. 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 pr…

  6. 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,…

  7. 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…

  8. 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…

Original filing · 0001213900-26-100280
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