[144] Arqit Quantum Inc. SEC Filing

Rhea-AI Filing Summary

Notice of proposed sale: A Form 144 was filed for Arqit Quantum Inc. (ARQQ) reporting an intended sale of 796 common shares through Fidelity Brokerage Services LLC on 10/06/2025 with an aggregate market value of $39,148.63. The shares were acquired by the filer via restricted stock vesting on 10/03/2025 and were issued as compensation.

The filing also lists prior sales by the same person, Andrew J. Leaver, in the past three months totaling 28,977 shares for gross proceeds of $1,232,069.77. The issuer reports 11,545,354 shares outstanding. The filer certifies they are not aware of any undisclosed material adverse information about the issuer.

Positive

• Securities were acquired via restricted stock vesting on 10/03/2025 indicating compensation alignment rather than an open-market purchase
• Proposed sale size is small relative to outstanding shares: 796 vs 11,545,354 outstanding (~0.007%)

Negative

• Insider dispositions totaled 28,977 shares in the past three months, generating $1,232,069.77, which may reflect insider liquidity needs
• Concentrated prior sale: a single sale of 25,000 shares on 07/18/2025 produced $1,080,075.17

Insights

Equity Trading Analyst

Small, routine insider sale tied to recent vesting; larger prior disposals in past 3 months.

The 796-share proposed sale was created from restricted stock vesting on 10/03/2025 and is being sold as compensation, which is a common mechanism for insiders to monetize recently vested equity. The reported aggregate market value for the proposed sale is $39,148.63.

The same individual sold 28,977 shares in the prior three months for $1,232,069.77, which represents about 0.25% of the 11,545,354 shares outstanding. This size is small relative to total capitalization but is useful to note when monitoring insider liquidity and timing over a rolling quarter.

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

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	796	39148.63	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			796	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
Andrew J. Leaver 3 Orchard Place London X0 SW1H 0BF	Common	07/07/2025	2468	81567.89
Andrew J. Leaver 3 Orchard Place London X0 SW1H 0BF	Common	07/18/2025	25000	1080075.17
Andrew J. Leaver 3 Orchard Place London X0 SW1H 0BF	Common	10/02/2025	749	32290.14
Andrew J. Leaver 3 Orchard Place London X0 SW1H 0BF	Common	10/03/2025	760	38136.57

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 the Form 144 for Arqit (ARQQ) report?

The Form 144 reports a proposed sale of 796 common shares on 10/06/2025 valued at $39,148.63, acquired via restricted stock vesting on 10/03/2025 as compensation.

Who sold shares in the past three months according to the filing?

Andrew J. Leaver sold 28,977 shares across four transactions between 07/07/2025 and 10/03/2025 for gross proceeds of $1,232,069.77.

How large is the proposed sale relative to Arqit's outstanding shares?

The proposed sale of 796 shares is about ~0.007% of the reported 11,545,354 shares outstanding.

Was the acquisition of the sold shares a gift or a purchase?

The filing shows the 796 shares were acquired by restricted stock vesting on 10/03/2025 and paid as compensation, not as a gift or cash purchase.

Which broker is handling the proposed sale?

The proposed sale is to be executed through Fidelity Brokerage Services LLC located at the address shown in the filing.

Does the filer assert knowledge of any undisclosed material adverse information?

Yes, by signing the notice the filer represents they do not know of any undisclosed material adverse information regarding the issuer.