Arqit Quantum director reports 4.6M shares acquired

Each warrant could be exercised at any time at the holder’s election to purchase one ARQQ ordinary share.

Rhea-AI Filing Summary

Arqit Quantum Inc. (ARQQ) director Lefebvre d'Ovidio Manfredi reported that Heritage Assets SCSp exercised 4,600,000 Ordinary Share Purchase Warrants on September 22, 2026, acquiring 4,600,000 ordinary shares at $2.50 per share. Each warrant entitled its holder to purchase one ordinary share and had an expiration date of September 30, 2026. After the transaction, 8,942,448 ordinary shares were beneficially owned indirectly through Heritage Assets SCSp, and the director held 49,023 ordinary shares directly. No Rule 10b5-1 plan is reported.

Insider Trade Summary

4,600,000 shares exercised/converted

Exercise 3 txns

Insider Lefebvre d'Ovidio Manfredi

Role Director

Type	Security	Shares	Price	Value
In-the-Money Exercise	Ordinary Share Purchase Warrants (right to buy) F1	4,600,000	$0.00	$0.00
In-the-Money Exercise	Ordinary Shares	4,600,000	$2.50	$11.50M
holding	Ordinary Shares	--	--	--

Holdings After Transaction: Ordinary Share Purchase Warrants (right to buy) — 0 contracts (Indirect, Beneficially owned through Heritage Assets SCSp); Ordinary Shares — 8,942,448 shares (Indirect, Beneficially owned through Heritage Assets SCSp); Ordinary Shares — 49,023 shares (Direct)

Footnotes (1)

1. F1. Each Ordinary Share Purchase Warrant can be exercised at any time, at the holder's election, to purchase one ARQQ ordinary share.

Key Figures

Warrants exercised: 4,600,000 warrants Exercise price: $2.50 per share Ordinary shares acquired: 4,600,000 shares +3 more

6 metrics

Warrants exercised 4,600,000 warrants September 22, 2026

Exercise price $2.50 per share Warrants exercised on September 22, 2026

Ordinary shares acquired 4,600,000 shares September 22, 2026

Indirect ordinary shares beneficially owned 8,942,448 shares Following the transaction; held through Heritage Assets SCSp

Direct ordinary shares held 49,023 shares September 22, 2026

Warrant expiration date September 30, 2026 Ordinary Share Purchase Warrants

Key Terms

Ordinary Share Purchase Warrants, foreign private issuer, Sections 16(b) and 16(c)

3 terms

Ordinary Share Purchase Warrants financial

"Each Ordinary Share Purchase Warrant can be exercised at any time"

Ordinary share purchase warrants are tradable securities that give the holder the right, but not the obligation, to buy a company’s ordinary shares at a set price (the exercise or strike price) during a specified time period. They matter to investors because they offer leveraged exposure to future share gains and can dilute existing shareholdings when exercised, while also serving as a way for companies to raise equity capital if holders convert them into shares.

foreign private issuer regulatory

"status as a foreign private issuer pursuant to Rule 3a12-3(b)"

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

Sections 16(b) and 16(c) regulatory

"transactions in the Issuer's securities are exempt from Sections 16(b) and 16(c)"

FAQ

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

How many ARQQ shares did the director acquire through warrants?

Heritage Assets SCSp exercised 4,600,000 warrants on September 22, 2026, acquiring 4,600,000 ordinary shares at $2.50 per share. After the transaction, 8,942,448 ordinary shares were beneficially owned indirectly through Heritage Assets SCSp; the director held 49,023 ordinary shares directly.

What were the terms of the ARQQ warrants?

Each warrant entitled its holder, at the holder’s election, to purchase one ARQQ ordinary share. The warrants had an expiration date of September 30, 2026, and the exercise price was $2.50 per share.

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

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Available on EDGAR 09/23/2026 - 04:31 PM Accepted by SEC EDGAR 09/23/2026 - 04:30 PM Learn about SEC filing dates

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^*

Lefebvre d'Ovidio Manfredi

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/22/2026

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)
			Code	V	Amount	(A) or (D)	Price
Ordinary Shares	09/22/2026		X		4,600,000	A	$2.5	8,942,448	I	Beneficially owned through Heritage Assets SCSp
Ordinary Shares								49,023	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Ordinary Share Purchase Warrants (right to buy)	$2.5	09/22/2026		X			4,600,000	(1)	09/30/2026	Ordinary Shares	4,600,000	$0	0	I	Beneficially owned through Heritage Assets SCSp

Explanation of Responses:

1. Each Ordinary Share Purchase Warrant can be exercised at any time, at the holder's election, to purchase one ARQQ ordinary share.

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/ Amir Heyat, as Attorney-in-Fact	09/23/2026
	** 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)