Arqit Quantum COO Ben Simon Wilder sells 233 shares

Q: How many ARQQ shares did the COO sell, and at what price?

Ben Simon Wilder sold 233 ordinary shares at $23.7847 per share on October 5, 2026. No Rule 10b5-1 plan is reported.

One RSU vesting schedule ends October 1, 2027, while the other extends to October 1, 2028.

Available on EDGAR 10/07/2026 - 07:42 PM EDT Accepted by SEC EDGAR 10/07/2026 - 07:42 PM EDT

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Rhea-AI Filing Summary

Arqit Quantum Inc. Chief Operating Officer Ben Simon Wilder reported converting 277 and 166 restricted share units into the same numbers of ordinary shares, and selling 233 ordinary shares, on October 5, 2026. The sale price was $23.7847 per share; no Rule 10b5-1 plan is reported. The RSUs vest quarterly in equal installments, with the two schedules extending through October 2027 and October 2028.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 5 txns

Insider Wilder Ben Simon

Role Chief Operating Officer

Sold 233 shs ($6K)

Approx. gross sale proceeds $6K

Share of Position Sold 5.0%

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units ^F2	277	$0.00	$0.00
Exercise	Restricted Share Units ^F3	166	$0.00	$0.00
Exercise	Ordinary Shares ^F1	277	$0.00	$0.00
Exercise	Ordinary Shares ^F1	166	$0.00	$0.00
Sale	Ordinary Shares	233	$23.7847	$6K

Holdings After Transaction: Restricted Share Units — 7,332 contracts (Direct); Ordinary Shares — 4,461.47 shares (Direct)

Holdings Before and After: Restricted Share Units, 7,775 to 7,332 contracts (Direct); Ordinary Shares, 4,251.47 to 4,461.47 shares (Direct)

Other Insiders: 5 other insiders reported open-market sales of this stock in the 30 days up to this filing.

Footnotes (3)

F1. The Restricted Share Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis.
F2. The RSUs vest quarterly in equal installments on October 1, 2026, and January 1, April 1, July 1, and October 1, 2027.
F3. The RSUs vest quarterly in equal installments on October 1, 2026, and January 1, April 1, July 1, and October 1, 2027, and January 1, April 1, July 1, and October 1, 2028.

Key Figures

Restricted share units converted: 277 shares Restricted share units converted: 166 shares Ordinary shares acquired: 277 shares +3 more

6 metrics

Restricted share units converted 277 shares October 5, 2026

Restricted share units converted 166 shares October 5, 2026

Ordinary shares acquired 277 shares October 5, 2026

Ordinary shares acquired 166 shares October 5, 2026

Ordinary shares sold 233 shares October 5, 2026

Sale price $23.7847 per share October 5, 2026

Key Terms

Restricted Share Units, one-for-one basis, vest quarterly in equal installments

3 terms

one-for-one basis financial

"convert into ARQQ ordinary shares on a one-for-one basis"

vest quarterly in equal installments financial

"RSUs vest quarterly in equal installments"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many ARQQ shares did the COO sell, and at what price?

Ben Simon Wilder sold 233 ordinary shares at $23.7847 per share on October 5, 2026. No Rule 10b5-1 plan is reported.

How do the ARQQ RSU vesting schedules work?

The schedule linked to 277 RSUs vests quarterly in equal installments on October 1, 2026, and January 1, April 1, July 1, and October 1, 2027. The schedule linked to 166 RSUs includes those dates and continues on January 1, April 1, July 1, and October 1, 2028. The RSUs convert into ordinary shares on a one-for-one basis.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Wilder Ben Simon

(Last)

(First)

(Middle)

3 ORCHARD PLACE

(Street)

LONDON

SW1H 0BF

(City)

(State)

(Zip)

UNITED KINGDOM

(Country)

2. Issuer Name and Ticker or Trading Symbol
Arqit Quantum Inc. [ ARQQ ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chief Operating Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/05/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Ordinary Shares	10/05/2026		M		277	A	$0⁽¹⁾	4,528.47	D
Ordinary Shares	10/05/2026		M		166	A	$0⁽¹⁾	4,694.47	D
Ordinary Shares	10/05/2026		S		233	D	$23.7847	4,461.47	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Share Units	⁽²⁾	10/05/2026		M			277	⁽²⁾	⁽²⁾	Ordinary Shares	277	$0	3,332	D
Restricted Share Units	⁽³⁾	10/05/2026		M			166	⁽³⁾	⁽³⁾	Ordinary Shares	166	$0	4,000	D

Explanation of Responses:

1. The Restricted Share Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis.

2. The RSUs vest quarterly in equal installments on October 1, 2026, and January 1, April 1, July 1, and October 1, 2027.

3. The RSUs vest quarterly in equal installments on October 1, 2026, and January 1, April 1, July 1, and October 1, 2027, and January 1, April 1, July 1, and October 1, 2028.

Remarks:

Due to the Issuer's status as a foreign private issuer pursuant to Rule 3a12-3(b) under the Securities Exchange Act of 1934 (the "Act"), the reporting person's transactions in the Issuer's securities are exempt from Sections 16(b) and 16(c) of the Act.

	/s/ Noleen McDonnell, as Attorney-in-Fact	10/07/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR