[144] Arqit Quantum Inc. SEC Filing

Rhea-AI Filing Summary

Arqit Quantum Inc. (ARQQ) submitted a Form 144 notifying the proposed sale of 1,419 common shares with an aggregate market value of $69,788.83, planned on 10/06/2025 via NASDAQ. The shares were acquired on 10/03/2025 through restricted stock vesting and were issued as compensation. The filing also lists multiple prior sales by the same person in 2025, including 373 shares on 07/07/2025, 2,000 shares on 07/18/2025, 3,000 shares on 07/21/2025, 1,336 shares on 10/02/2025, and 1,353 shares on 10/03/2025, with individual gross proceeds shown for each sale. The filer certifies no undisclosed material adverse information and includes the standard Rule 144 representations.

Positive

• Shares to be sold were acquired via restricted stock vesting on 10/03/2025, indicating compensation rather than an open-market purchase
• Sale routed through an established broker (Fidelity Brokerage Services LLC) on NASDAQ, reflecting standard execution channels

Negative

• Multiple insider sales in 2025 are listed: 373 shares on 07/07/2025, 2,000 on 07/18/2025, and 3,000 on 07/21/2025
• Recent sales near the filing date include 1,336 shares on 10/02/2025 and 1,353 shares on 10/03/2025, which may indicate continuing insider liquidity

Insights

Insider Transactions Analyst

Insider sold vested compensation shares across 2025; the Form 144 notifies a planned 1,419-share sale on 10/06/2025.

The notice shows the 1,419 shares to be sold were acquired by restricted stock vesting on 10/03/2025 and classified as compensation, which is a routine source for insider sales. Sales are to be executed through Fidelity Brokerage Services LLC on NASDAQ, indicating standard brokerage routing rather than a private transaction.

The same account records several earlier sales in 2025 (amounts and gross proceeds are listed), which investors may track for pacing of insider liquidity. Monitor whether future filings show additional planned sales or a formal trading plan date, since none is specified here.

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	1419	69788.83	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			1419	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
Patrick Willcocks 3 Orchard Place London X0 SW1H 0BF	Common	07/07/2025	373	12327.72
Patrick Willcocks 3 Orchard Place London X0 SW1H 0BF	Common	07/18/2025	2000	87540.00
Patrick Willcocks 3 Orchard Place London X0 SW1H 0BF	Common	07/21/2025	3000	150000.00
Patrick Willcocks 3 Orchard Place London X0 SW1H 0BF	Common	10/02/2025	1336	57596.30
Patrick Willcocks 3 Orchard Place London X0 SW1H 0BF	Common	10/03/2025	1353	67893.13

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 Quantum (ARQQ) report in this Form 144?

The filing notifies a proposed sale of 1,419 common shares valued at $69,788.83, planned on 10/06/2025, acquired via restricted stock vesting on 10/03/2025 as compensation.

Who is handling the sale of ARQQ shares listed in the Form 144?

The sale is to be executed through Fidelity Brokerage Services LLC (900 Salem Street, Smithfield, RI) on the NASDAQ exchange.

Has the filer sold ARQQ shares recently before this Form 144?

Yes. The filing lists prior sales in 2025: 373 shares on 07/07/2025, 2,000 on 07/18/2025, 3,000 on 07/21/2025, 1,336 on 10/02/2025, and 1,353 on 10/03/2025, with gross proceeds shown for each.

How were the shares being sold originally acquired?

The 1,419 shares were acquired on 10/03/2025 through restricted stock vesting from the issuer, and payment is recorded as compensation.

Does the filer state any undisclosed material adverse information about ARQQ?

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