Arqit Quantum director exercises RSUs, adds shares

Arqit Quantum Inc. director Carlo Calabria exercised restricted stock units and received additional shares as compensation.

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Rhea-AI Filing Summary

Arqit Quantum Inc. director Carlo Calabria exercised restricted stock units and received additional shares as compensation. On April 1, 2026, he converted a total of 1,051 restricted stock units into 1,051 ordinary shares at a stated price of $0.00 per share.

Following these conversions, Calabria directly held 109,224 ordinary shares. Footnotes explain that the restricted stock units convert into ARQQ ordinary shares on a one-for-one basis and vest in equal quarterly installments across multiple dates in 2026, 2027 and 2028.

Insider Trade Summary

1,051 shares exercised/converted

Exercise 8 txns

Insider Calabria Carlo

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	50	$0.00	$0.00
Exercise	Restricted Stock Units	250	$0.00	$0.00
Exercise	Restricted Stock Units	250	$0.00	$0.00
Exercise	Restricted Stock Units	501	$0.00	$0.00
Exercise	Ordinary Shares	50	$0.00	$0.00
Exercise	Ordinary Shares	250	$0.00	$0.00
Exercise	Ordinary Shares	250	$0.00	$0.00
Exercise	Ordinary Shares	501	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 5,300 contracts (Direct); Ordinary Shares — 109,224 shares (Direct)

Footnotes (5)

F1. Restricted Stock Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis.
F2. The RSUs vest quarterly in equal installments on April 1, and July 1, 2026.
F3. The RSUs vest quarterly in equal installments on April 1, July 1, and October 1, 2026, and January 1, April 1, July 1, and October 1, 2027.
F4. The RSUs vest quarterly in equal installments on April 1, July 1, and October 1, 2026, and January 1, April 1, and July 1, 2027.
F5. 501 RSUs vested on April 1, 2026 and the remaining RSUs vest quarterly in equal installments on July 1, and 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

RSUs converted: 1,051 units Shares acquired: 1,051 shares Post-transaction holdings: 109,224 shares +2 more

5 metrics

RSUs converted 1,051 units Restricted stock units exercised into ordinary shares on April 1, 2026

Shares acquired 1,051 shares Ordinary shares received from RSU conversions on April 1, 2026

Post-transaction holdings 109,224 shares Ordinary shares directly held by Carlo Calabria after transactions

Single vesting tranche 501 RSUs Restricted stock units vested on April 1, 2026

Exercise price $0.00 per share Stated price per share for RSU conversions

Key Terms

Restricted Stock Units, RSUs, derivative security, vest, +1 more

5 terms

Restricted Stock Units financial

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

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

RSUs financial

"The RSUs vest quarterly in equal installments on April 1, and July 1, 2026."

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

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.

vest financial

"501 RSUs vested on April 1, 2026 and the remaining RSUs vest quarterly in equal installments"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

ordinary shares financial

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

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.

FAQ

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

Carlo Calabria reported exercising restricted stock units and receiving ordinary shares in Arqit Quantum. On April 1, 2026, he converted 1,051 restricted stock units into 1,051 ordinary shares as part of his equity compensation, with no open-market purchases or sales disclosed.

How many Arqit Quantum (ARQQ) shares does Carlo Calabria hold after this Form 4?

After the reported transactions, Carlo Calabria directly holds 109,224 ordinary shares of Arqit Quantum. This reflects the addition of 1,051 shares received from restricted stock unit conversions on April 1, 2026, as part of his director equity awards rather than open-market trading.

Did Carlo Calabria buy or sell Arqit Quantum (ARQQ) shares on the open market?

The filing shows no open-market buying or selling by Carlo Calabria. All reported activity involves the exercise or conversion of restricted stock units into ordinary shares at a stated price of $0.00 per share, reflecting equity compensation vesting rather than discretionary market trades.

What are the terms of Carlo Calabria’s restricted stock units in Arqit Quantum (ARQQ)?

Calabria’s restricted stock units convert into ARQQ ordinary shares on a one-for-one basis. Footnotes state that different grants vest in equal quarterly installments on dates including April 1, July 1, October 1, 2026, and several quarterly dates throughout 2027 and 2028.

How many Arqit Quantum (ARQQ) restricted stock units vested for Carlo Calabria on April 1, 2026?

One footnote states that 501 restricted stock units vested on April 1, 2026 for Carlo Calabria. The remaining units from that grant are scheduled to vest in equal quarterly installments on multiple dates in 2026, 2027 and 2028, subject to the award terms.

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

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 04/03/2026 - 07:39 PM EDT

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)
04/01/2026

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	04/01/2026		M		50	A	$0⁽¹⁾	108,223	D
Ordinary Shares	04/01/2026		M		250	A	$0⁽¹⁾	108,473	D
Ordinary Shares	04/01/2026		M		250	A	$0⁽¹⁾	108,723	D
Ordinary Shares	04/01/2026		M		501	A	$0⁽¹⁾	109,224	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 Stock Units	⁽¹⁾	04/01/2026		M			50	⁽²⁾	⁽²⁾	Ordinary Shares	50	$0	50	D
Restricted Stock Units	⁽¹⁾	04/01/2026		M			250	⁽³⁾	⁽³⁾	Ordinary Shares	250	$0	1,501	D
Restricted Stock Units	⁽¹⁾	04/01/2026		M			250	⁽⁴⁾	⁽⁴⁾	Ordinary Shares	250	$0	1,250	D
Restricted Stock Units	⁽¹⁾	04/01/2026		M			501	⁽⁵⁾	⁽⁵⁾	Ordinary Shares	501	$0	2,499	D

Explanation of Responses:

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

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

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

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

5. 501 RSUs vested on April 1, 2026 and the remaining RSUs vest quarterly in equal installments on July 1, and 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	04/03/2026
	** 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