[Form 4] Arqit Quantum Inc. Insider Trading Activity

Rhea-AI Filing Summary

Arqit Quantum Inc. director Lefebvre d'Ovidio Manfredi, through Heritage Assets SCSp, reported small open-market sales of Business Combination Warrants. Heritage Assets SCSp sold 62 warrants at $1.50 each and 52 warrants at $1.40 each, for a total of 114 warrants.

According to the disclosure, the reporting person beneficially owns 521,451 Business Combination Warrants, which on a post-reverse split basis are equivalent to 20,858.04 ordinary shares. Each warrant has an exercise price of $11.50 and, after the 25-for-1 reverse stock split, 25 warrants are required to receive one whole ordinary share at an aggregate exercise price of $287.50 per share.

Insider Trade Summary

Net Seller: 114 shares ($166)

Net Sell 2 txns

Insider Lefebvre d'Ovidio Manfredi

Role null

Sold 114 shs ($165.80)

Type	Security	Shares	Price	Value
Sale	Business Combination Warrants (right to buy)	62	$1.50	$93.00
Sale	Business Combination Warrants (right to buy)	52	$1.40	$72.80

Holdings After Transaction: Business Combination Warrants (right to buy) — 20,858.04 shares (Indirect, Beneficially owned through Heritage Assets SCSp)

Footnotes (1)

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Key Figures

Warrants sold at $1.50: 62 Business Combination Warrants Warrants sold at $1.40: 52 Business Combination Warrants Total warrants sold: 114 Business Combination Warrants +5 more

8 metrics

Warrants sold at $1.50 62 Business Combination Warrants Open-market sale at $1.50 per warrant

Warrants sold at $1.40 52 Business Combination Warrants Open-market sale at $1.40 per warrant

Total warrants sold 114 Business Combination Warrants Net-sell across two derivative transactions

Warrants beneficially owned 521,451 Business Combination Warrants Equivalent to 20,858.04 ordinary shares post-split

Share equivalent 20,858.04 ordinary shares If all 521,451 warrants are exercised post-split

Warrant exercise price $11.50 per warrant Exercise price for Business Combination Warrants

Reverse split ratio 25-to-1 Every 25 ordinary shares consolidated into one

Aggregate exercise per share $287.50 per ordinary share 25 warrants needed for one whole share post-split

Key Terms

Business Combination Warrants, reverse stock split, beneficially owns, exercise price, +1 more

5 terms

Business Combination Warrants financial

"Each Business Combination Warrant has an exercise price of $11.50"

reverse stock split financial

"announced the implementation of a reverse stock split whereby every 25 outstanding"

A reverse stock split is when a company reduces the number of its shares outstanding, making each share more valuable. For example, if you own 100 shares worth $1 each, a 1-for-10 reverse split would turn your 100 shares into 10 shares worth $10 each. Companies often do this to boost their stock price and appear more stable to investors.

beneficially owns financial

"The reporting person beneficially owns 521,451 Business Combination Warrants"

Beneficially owns means a person or entity enjoys the economic benefits and control of a security even if the legal title or registration is held in another name. Think of it like having the keys and profits from a car that is registered to a friend: you use it, benefit from it, and make decisions about it even though the official paperwork lists someone else. For investors, this matters because it reveals who truly controls shares, affects voting power, potential conflicts of interest, and regulatory disclosure obligations.

exercise price financial

"Each Business Combination Warrant has an exercise price of $11.50"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

indirect ownership financial

"Beneficially owned through Heritage Assets SCSp"

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Form 4 Insider Transactions: What Each Field Means →

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 X0 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)
06/09/2026

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

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
Business Combination Warrants (right to buy)	(1)	06/09/2026		S			52	(1)	09/03/2026	Ordinary Shares	52	$1.4	20,919.68	I	Beneficially owned through Heritage Assets SCSp
Business Combination Warrants (right to buy)	(1)	06/10/2026		S			62	(1)	09/03/2026	Ordinary Shares	62	$1.5	20,858.04	I	Beneficially owned through Heritage Assets SCSp

Explanation of Responses:

1. On September 19, 2024, Arqit Quantum Inc. (ARQQ) announced the implementation of a reverse stock split whereby every 25 outstanding ARQQ ordinary shares were consolidated into one ordinary share, par value $0.0025 per share. Each Business Combination Warrant has an exercise price of $11.50 and can be exercised at any time, at the holder's election, to purchase 0.04 of an ARQQ ordinary share on a post-reverse stock split basis, and cannot be exercised for fractional shares. Accordingly, on a post-reverse stock split basis holders of Business Combination Warrants are required to exercise at least 25 Business Combination Warrants in order to receive one whole ARQQ ordinary share at an aggregate exercise price of $287.50 per whole ARQQ ordinary share. The reporting person beneficially owns 521,451 Business Combination Warrants, which, if exercised in full, would be equivalent to 20,858.04 ARQQ ordinary shares on a post-reverse stock split basis.

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	06/11/2026
	** 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)