Arqit director-linked entity sells 1,404 warrants

Arqit Quantum Inc. director Lefebvre d'Ovidio Manfredi, through Heritage Assets SCSp, reported open-market sales of Business Combination Warrants linked to ARQQ ordinary shares.

Rhea-AI Filing Summary

Arqit Quantum Inc. director Lefebvre d'Ovidio Manfredi, through Heritage Assets SCSp, reported open-market sales of Business Combination Warrants linked to ARQQ ordinary shares. On June 17 and 18, 2026, the entity sold a total of 1,404 warrants at $1.50 per warrant.

These warrants are exercisable at an effective exercise price of $11.50 per whole ordinary share, with 25 warrants needed for one share after a 25-for-1 reverse stock split. Following the transactions, the reporting person beneficially owns 428,544 warrants, equivalent to 17,141.76 ordinary shares if fully exercised.

Insider Trade Summary

Net Seller: 1,404 shares

Net Sell 2 txns

Insider Lefebvre d'Ovidio Manfredi

Role Director

Sold 1,404 shs ($2K)

Type	Security	Shares	Price	Value
Sale	Business Combination Warrants (right to buy)	524	$1.50	$786.00
Sale	Business Combination Warrants (right to buy)	880	$1.50	$1K

Holdings After Transaction: Business Combination Warrants (right to buy) — 34,807.92 contracts (Indirect, Beneficially owned through Heritage Assets SCSp)

Footnotes (1)

1. F1. 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 428,544 Business Combination Warrants, which, if exercised in full, would be equivalent to 17,141.76 ARQQ ordinary shares on a post-reverse stock split basis.

Key Figures

Warrants sold June 18, 2026: 524 warrants at $1.50 Warrants sold June 17, 2026: 880 warrants at $1.50 Total warrants sold: 1,404 warrants +5 more

8 metrics

Warrants sold June 18, 2026 524 warrants at $1.50 Open-market sale of Business Combination Warrants

Warrants sold June 17, 2026 880 warrants at $1.50 Open-market sale of Business Combination Warrants

Total warrants sold 1,404 warrants Combined June 17–18, 2026 transactions

Remaining warrant holdings 428,544 warrants Beneficially owned after transactions

Ordinary share equivalent 17,141.76 shares If all 428,544 warrants are exercised post-split

Warrant exercise price $11.50 per share Exercise price for ARQQ ordinary shares

Warrants per share post-split 25 warrants per share Post 25-for-1 reverse stock split requirement

Aggregate exercise cost $287.50 per share 25 warrants exercised for one ordinary share

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 reduces a company's number of outstanding shares while raising the price per share proportionally, so the total value of each investor's holding is unchanged; a 1-for-10 split turns 100 shares worth $1 each into 10 shares worth $10 each. Companies often do this to regain compliance with an exchange's minimum price rule or to attract investors who avoid very low-priced stocks.

beneficially owns financial

"The reporting person beneficially owns 428,544 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.

ordinary share financial

"would be equivalent to 17,141.76 ARQQ ordinary shares on a post-reverse stock split basis"

An ordinary share is a unit of ownership in a company that gives the holder a stake in its profits and usually the right to vote on key decisions. Think of it like a slice of a pizza where each slice entitles you to a portion of what’s left after bills are paid; value can rise or fall with the business and may pay dividends, so it matters to investors for income, growth and control.

FAQ

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

What insider activity did Arqit Quantum (ARQQ) disclose in this Form 4?

Arqit Quantum (ARQQ) disclosed that an entity associated with director Lefebvre d'Ovidio Manfredi sold 1,404 Business Combination Warrants in open-market transactions. These sales occurred over two days at a price of $1.50 per warrant, reducing but not eliminating the warrant position.

Who executed the warrant sales related to Arqit Quantum (ARQQ)?

The warrant sales were executed by Heritage Assets SCSp, an entity through which director Lefebvre d'Ovidio Manfredi beneficially owns the securities. The ownership is reported as indirect, meaning the director’s interest arises via this associated investment vehicle rather than personal direct holdings.

How many Arqit Quantum (ARQQ) warrants were sold and at what price?

In total, 1,404 Business Combination Warrants were sold, split between 524 warrants on June 18, 2026 and 880 warrants on June 17, 2026. Each warrant sale was reported at a transaction price of $1.50 per warrant in open-market trades.

What warrant position remains after these Arqit Quantum (ARQQ) transactions?

After the reported sales, the reporting person beneficially owns 428,544 Business Combination Warrants. According to the disclosure, this remaining position would be equivalent to 17,141.76 ARQQ ordinary shares on a post-reverse stock split basis if all warrants were fully exercised.

How does the reverse stock split affect Arqit Quantum (ARQQ) warrants?

Arqit Quantum implemented a 25-for-1 reverse stock split, consolidating every 25 ordinary shares into one. Each warrant now entitles the holder to 0.04 ordinary share, so 25 warrants must be exercised together to receive one whole ARQQ ordinary share under the new structure.

What is the effective exercise price of Arqit Quantum (ARQQ) warrants?

Each Business Combination Warrant has an exercise price of $11.50 per ARQQ ordinary share. Because 25 warrants are required to obtain one whole share post-split, the aggregate exercise cost for one ordinary share is $287.50 when all 25 linked warrants are exercised together.

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

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Accepted by SEC EDGAR 06/22/2026 - 04:05 PM EDT 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 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)
06/17/2026

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)	06/17/2026		S			880	(1)	09/03/2026	Ordinary Shares	880	$1.5	17,666.16	I	Beneficially owned through Heritage Assets SCSp
Business Combination Warrants (right to buy)	(1)	06/18/2026		S			524	(1)	09/03/2026	Ordinary Shares	524	$1.5	17,141.76	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 428,544 Business Combination Warrants, which, if exercised in full, would be equivalent to 17,141.76 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	06/22/2026
	** 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)