Arqit director sells 512 shares, exercises RSUs

Arqit Quantum Inc. director Ritchie Garth reported a mix of share sales and equity awards activity.

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Rhea-AI Filing Summary

Arqit Quantum Inc. director Ritchie Garth reported a mix of share sales and equity awards activity. On April 2, 2026, he completed an open-market sale of 512 Ordinary Shares at $13.2463 per share, leaving 28,800 Ordinary Shares held directly afterward.

On April 1, 2026, multiple Restricted Stock Units (RSUs) were exercised at a $0.00 conversion price, delivering a total of 1,051 Ordinary Shares. The RSUs convert into Ordinary Shares on a one-for-one basis and vest in quarterly installments through 2028 under several schedules described in the footnotes.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 9 txns

Insider Ritchie Garth

Role Director

Sold 512 shs ($7K)

Approx. gross sale proceeds $7K

Approx. exercise cost $0.00

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	512	$13.2463	$7K
Exercise	Restricted Stock Units	250	$0.00	$0.00
Exercise	Restricted Stock Units	50	$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	250	$0.00	$0.00
Exercise	Ordinary Shares	50	$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 — 28,800 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, July 1, and October 1, 2026, and January 1, April 1, and July 1, 2027.
F3. The RSUs vest quarterly in equal installments on April 1, and July 1, 2026.
F4. 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.
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

Open-market sale: 512 shares at $13.2463 RSU exercises: 1,051 shares at $0.00 Shares held after transactions: 28,800 Ordinary Shares +1 more

4 metrics

Open-market sale 512 shares at $13.2463 Ordinary Shares sold on April 2, 2026

RSU exercises 1,051 shares at $0.00 Ordinary Shares from RSU conversions on April 1, 2026

Shares held after transactions 28,800 Ordinary Shares Direct ownership after April 2, 2026 sale

RSUs vested on April 1, 2026 501 RSUs Portion of RSU grant vesting on April 1, 2026

Key Terms

Restricted Stock Units, open-market sale, derivative exercise/conversion, vest quarterly, +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.

open-market sale financial

"transaction_action: "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

derivative exercise/conversion financial

"transaction_action: "derivative exercise/conversion""

vest quarterly financial

"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."

Ordinary Shares financial

"Restricted Stock Units ("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 transactions did Arqit Quantum (ARQQ) director Ritchie Garth report?

Ritchie Garth reported one open-market sale of Ordinary Shares and several RSU exercises. The sale covered 512 shares at $13.2463 each, while RSU conversions delivered 1,051 Ordinary Shares at a zero exercise price, increasing his overall equity position.

How many Arqit Quantum (ARQQ) shares did the director sell and at what price?

He sold 512 Ordinary Shares in an open-market transaction at $13.2463 per share. This was a single non-derivative sale, and after the transaction he continued to hold 28,800 Ordinary Shares directly, according to the Form 4 disclosure.

What RSU activity did Arqit Quantum (ARQQ) disclose for director Ritchie Garth?

The filing shows several RSU exercises converting into a total of 1,051 Ordinary Shares at a $0.00 conversion price. These RSUs convert one-for-one into Ordinary Shares and are subject to detailed quarterly vesting schedules extending through various dates into 2028.

How many Arqit Quantum (ARQQ) shares does the director hold after these transactions?

Following the reported sale and RSU conversions, Garth directly holds 28,800 Ordinary Shares. This figure reflects his position after the April 2, 2026 open-market sale and the April 1, 2026 RSU exercises disclosed in the Form 4.

How do the Arqit Quantum (ARQQ) RSUs vest for director Ritchie Garth?

The RSUs vest in equal quarterly installments across multiple schedules. Footnotes describe vesting dates on April 1, July 1, and October 1 of 2026 and additional quarterly dates in 2027 and 2028, with 501 RSUs already vested on April 1, 2026.

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Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 04/03/2026 - 07:30 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^*

Ritchie Garth

(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		250	A	$0⁽¹⁾	28,511	D
Ordinary Shares	04/01/2026		M		50	A	$0⁽¹⁾	28,561	D
Ordinary Shares	04/01/2026		M		250	A	$0⁽¹⁾	28,811	D
Ordinary Shares	04/01/2026		M		501	A	$0⁽¹⁾	29,312	D
Ordinary Shares	04/02/2026		S		512	D	$13.2463	28,800	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			250	⁽²⁾	⁽²⁾	Ordinary Shares	250	$0	1,250	D
Restricted Stock Units	⁽¹⁾	04/01/2026		M			50	⁽³⁾	⁽³⁾	Ordinary Shares	50	$0	50	D
Restricted Stock Units	⁽¹⁾	04/01/2026		M			250	⁽⁴⁾	⁽⁴⁾	Ordinary Shares	250	$0	1,501	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, July 1, and October 1, 2026, and January 1, April 1, and July 1, 2027.

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

4. 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.

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