[144] Arqit Quantum Inc. SEC Filing

Rhea-AI Filing Summary

Arqit Quantum Inc. (ticker ARQQ) submitted a Form 144 reporting a proposed sale of 1,105 common shares held at Fidelity Brokerage Services with an aggregate market value of $55,448.57, intended for sale on or about 10/03/2025 on NASDAQ. The shares were acquired through restricted stock vesting on 10/02/2025 and were paid as compensation. The filing also discloses two recent sales by the same person: 956 shares sold on 07/07/2025 for $31,595.99 and 1,091 shares sold on 10/02/2025 for $47,034.10. By signing, the seller represents no undisclosed material adverse information about the issuer.

Positive

• 1,105 shares acquired via restricted stock vesting—clear provenance and compensation treatment
• Form specifies intended sale on NASDAQ with an explicit approximate date (10/03/2025)

Negative

• Insider sales of 1,105 shares (plus prior 2,047 shares) represent insider liquidity which may increase share supply

Insights

Securities Compliance Analyst

Routine insider sale notice for vested compensation shares

This Form 144 documents a proposed sale of 1,105 shares acquired via restricted stock vesting and classified as compensation, which is a common insider liquidity event after vesting.

The filing identifies the intended exchange (NASDAQ) and an approximate sale date (10/03/2025), meeting Rule 144 notice requirements. The signer also affirms there is no undisclosed material adverse information, a standard compliance representation.

Equity Markets Analyst

Small-scale sale relative to typical market caps; limited market impact

The aggregate value reported is $55,448.57, with two prior sales totaling 2,047 shares and gross proceeds of $78,630.09, indicating modest insider liquidity rather than a large disposition.

Because the filing shows shares were provided as compensation and recently vested (10/02/2025), this appears to be scheduled post-vesting selling rather than an extraordinary corporate development.

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	1105	55448.57	11545354	10/03/2025	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	10/02/2025	Restricted Stock Vesting	Issuer			1105	10/02/2025	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
Paul Feenan 3 Orchard Place London X0 SW1H 0BF	Common	07/07/2025	956	31595.99
Paul Feenan 3 Orchard Place London X0 SW1H 0BF	Common	10/02/2025	1091	47034.10

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 did Arqit Quantum (ARQQ) disclose in this Form 144?

The filing reports a proposed sale of 1,105 common shares (aggregate market value $55,448.57) expected on or about 10/03/2025, acquired by restricted stock vesting on 10/02/2025 and paid as compensation.

Who holds the shares to be sold and where are they held?

The shares are held at Fidelity Brokerage Services LLC (900 Salem Street, Smithfield RI) for the account of the selling person named in the filing.

Has the filer sold other ARQQ shares recently?

Yes. The filing discloses prior sales by the same person: 956 shares on 07/07/2025 for $31,595.99 and 1,091 shares on 10/02/2025 for $47,034.10.

What does the filer certify by signing the Form 144?

The signer represents they do not know any material adverse information about the issuer that has not been publicly disclosed and notes Rule 10b5-1 plan disclosure if applicable.

How were the 1,105 shares originally acquired?

They were acquired on 10/02/2025 through restricted stock vesting from the issuer and classified as compensation.