Director at Arqit Quantum (NASDAQ: ARQQ) exercises 120K share warrants

Rhea-AI Filing Summary

Arqit Quantum Inc. director Carlo Calabria exercised derivative securities to increase his direct equity stake. He exercised Ordinary Share Purchase Warrants covering 120,000 Arqit Quantum ordinary shares at an exercise price of $2.50 per share, converting them into Ordinary Shares.

After this warrant exercise, Calabria directly holds 230,922 Ordinary Shares. The related warrant position reported in this filing was fully exercised, with zero warrants remaining outstanding from this specific grant.

Insider Trade Summary

120,000 shares exercised/converted

Mixed 2 txns

Insider Calabria Carlo

Role null

Type	Security	Shares	Price	Value
Exercise	Ordinary Share Purchase Warrants (right to buy)	120,000	$0.00	--
Exercise	Ordinary Shares	120,000	$2.50	$300K

Holdings After Transaction: Ordinary Share Purchase Warrants (right to buy) — 0 shares (Direct, null); Ordinary Shares — 230,922 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares acquired via exercise: 120,000 shares Exercise price: $2.50 per share Shares held after transaction: 230,922 shares +2 more

5 metrics

Shares acquired via exercise 120,000 shares Ordinary Shares from warrant exercise on June 3, 2026

Exercise price $2.50 per share Ordinary Share Purchase Warrants exercise price

Shares held after transaction 230,922 shares Direct holdings of Ordinary Shares after exercise

Warrants exercised 120,000 warrants Ordinary Share Purchase Warrants converted to Ordinary Shares

Warrant expiration date September 30, 2026 Expiration date of exercised Ordinary Share Purchase Warrants

Key Terms

Ordinary Share Purchase Warrants, derivative security, exercise price, Ordinary Shares

4 terms

Ordinary Share Purchase Warrants financial

"Ordinary Share Purchase Warrants exercised at $2.50 per share for ARQQ ordinary shares."

derivative security financial

"transaction_code_description": "Exercise or conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

exercise price financial

"Ordinary Share Purchase Warrants exercised at $2.50 per share for ARQQ ordinary shares."

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 Shares financial

"Ordinary Share Purchase Warrants exercised at $2.50 per share for ARQQ ordinary shares."

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

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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^*

Calabria Carlo

(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)
06/03/2026

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	06/03/2026		M		120,000	A	$2.5(1)	230,922	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	06/03/2026		M			120,000	(1)	09/30/2026	Ordinary Shares	120,000	$0	0	D

Explanation of Responses:

1. Ordinary Share Purchase Warrants exercised at $2.50 per share for ARQQ ordinary shares.

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	06/05/2026
	** 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)

FAQ

What insider transaction did Carlo Calabria report for Arqit Quantum (ARQQ)?

Carlo Calabria reported exercising Ordinary Share Purchase Warrants for 120,000 Arqit Quantum ordinary shares. The warrants were exercised as a derivative security transaction, converting them into Ordinary Shares rather than representing an open-market purchase or sale of existing shares.

How many Arqit Quantum (ARQQ) shares did Carlo Calabria acquire and at what price?

Carlo Calabria acquired 120,000 Arqit Quantum ordinary shares by exercising warrants at an exercise price of $2.50 per share. This transaction reflects a derivative exercise, where warrants are converted into common equity at a preset price defined in the warrant terms.

Is Carlo Calabria’s Form 4 transaction in ARQQ an open-market buy or a warrant exercise?

The Form 4 shows a warrant exercise, not an open-market buy. Calabria exercised Ordinary Share Purchase Warrants as a derivative security, converting them into 120,000 Ordinary Shares at a fixed $2.50 exercise price instead of buying shares directly on the market.

How many Arqit Quantum (ARQQ) shares does Carlo Calabria hold after this transaction?

Following the warrant exercise, Carlo Calabria directly holds 230,922 Arqit Quantum Ordinary Shares. This figure reflects his direct ownership position reported after converting 120,000 warrants into ordinary shares in the Form 4 insider filing.

What were the key terms of the exercised Arqit Quantum (ARQQ) warrants?

The exercised securities were Ordinary Share Purchase Warrants for 120,000 underlying Arqit Quantum Ordinary Shares, with an exercise price of $2.50 per share and an expiration date of September 30, 2026, as reflected in the derivative transaction details.

Do any Arqit Quantum (ARQQ) warrants remain after Carlo Calabria’s exercise?

For the specific Ordinary Share Purchase Warrants reported, the post-transaction balance is zero warrants. The Form 4 derivative line shows 0.0000 warrants following the transaction, indicating this particular warrant position was fully exercised into ordinary shares.