[144] Arqit Quantum Inc. SEC Filing

Rhea-AI Filing Summary

Arqit Quantum Inc. reported a Form 144 notice disclosing proposed sales by an insider. The filing shows 859 common shares that vested on 10/03/2025 and are listed for proposed sale on 10/06/2025 through Fidelity Brokerage Services LLC with an aggregate market value of $42,247.07. The filer records total outstanding common shares of 11,545,354.

The same insider sold three prior blocks in the past three months: 3 shares on 09/03/2025 for $84.99, 811 shares on 10/02/2025 for $34,963.02, and 820 shares on 10/03/2025 for $41,147.36. The vested shares are described as compensation and the filer attests they know of no undisclosed material adverse information.

Insights

Corporate Governance Analyst

TL;DR: Insider plans to sell vested compensation shares totaling 859 on 10/06/2025.

The filing shows 859 common shares vested on 10/03/2025 and designated for sale via Fidelity Brokerage Services LLC with an aggregate market value of $42,247.07. The company’s outstanding common shares are listed as 11,545,354, placing the proposed sale at a small fraction of total shares.

Three prior sales by the same person in the past three months totaled 1,634 shares for gross proceeds of $76,194.38. The seller signed the required attestation that no undisclosed material adverse information is known. Watch for the actual trade execution on 10/06/2025 and any subsequent Form 4 filings that would show completion or additional insider transactions.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	859	42247.07	11545354	10/06/2025	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	10/03/2025	Restricted Stock Vesting	Issuer			859	10/03/2025	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Daniel Shiu 3 Orchard Place London X0 SW1H 0BF	Common	09/03/2025	3	84.99
Daniel Shiu 3 Orchard Place London X0 SW1H 0BF	Common	10/02/2025	811	34963.02
Daniel Shiu 3 Orchard Place London X0 SW1H 0BF	Common	10/03/2025	820	41147.36

144: Remarks and Signature

Remarks

Date of Notice

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does Arqit (ARQQ) Form 144 disclose about the proposed sale?

The filing discloses a proposed sale of 859 common shares that vested on 10/03/2025, to be sold on 10/06/2025 through Fidelity Brokerage Services LLC, with aggregate market value $42,247.07.

How many common shares does Arqit report outstanding on the Form 144?

The filing lists 11,545,354 common shares outstanding.

Has the insider sold other Arqit shares recently?

Yes. The same person sold 3 shares on 09/03/2025 for $84.99, 811 shares on 10/02/2025 for $34,963.02, and 820 shares on 10/03/2025 for $41,147.36.

What was the acquisition event for the shares being sold?

The 859 shares were acquired through Restricted Stock Vesting on 10/03/2025 and payment type is listed as Compensation.

What representation did the seller make on the Form 144?

By signing, the seller represents they do not know any material adverse information about the issuer that has not been publicly disclosed.