Arqit Quantum (ARQQ) COO sells 683 shares after RSU conversion

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Arqit Quantum Inc. Chief Operating Officer Wilder Ben Simon reported a mix of equity awards vesting and a small share sale. On April 1, 2026, he exercised 1,333 Restricted Stock Units (RSUs), converting them into the same number of ordinary shares at a $0.00 exercise price under compensation arrangements where RSUs convert one-for-one into ARQQ ordinary shares.

On April 2, 2026, he completed an open-market sale of 683 ordinary shares at an average price of $13.3112 per share. After these transactions, he directly holds 3,018.47 ordinary shares. Footnotes explain that RSUs vest quarterly in equal installments on specified dates from 2026 through 2028, spreading the delivery of additional shares over multiple future vesting dates.

Insider Trade Summary

Net Seller: 683 shares ($9,092)

Net Sell 5 txns

Insider Wilder Ben Simon

Role Chief Operating Officer

Sold 683 shs ($9K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	683	$13.3112	$9K
Exercise	Restricted Stock Units	833	$0.00	--
Exercise	Restricted Stock Units	500	$0.00	--
Exercise	Ordinary Shares	833	$0.00	--
Exercise	Ordinary Shares	500	$0.00	--

Holdings After Transaction: Ordinary Shares — 3,018.47 shares (Direct); Restricted Stock Units — 4,998 shares (Direct)

Footnotes (1)

Restricted Stock Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis. 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. 500 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

Shares sold: 683 shares Sale price per share: $13.3112 per share Shares held after sale: 3,018.47 shares +3 more

6 metrics

Shares sold 683 shares Open-market sale of ordinary shares on April 2, 2026

Sale price per share $13.3112 per share Average price for 683 ordinary shares sold

Shares held after sale 3,018.47 shares Direct holdings of ordinary shares following transactions

RSUs exercised 1,333 RSUs Restricted Stock Units converted into ordinary shares on April 1, 2026

RSU exercise price $0.00 Exercise or conversion price for RSUs into ordinary shares

RSU conversion ratio 1 RSU : 1 share RSUs convert into ARQQ ordinary shares on a one-for-one basis

Key Terms

Restricted Stock Units, derivative exercise/conversion, open-market sale, one-for-one basis, +1 more

5 terms

Restricted Stock Units financial

"Restricted Stock Units ("RSUs") convert into ARQQ ordinary shares"

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.

derivative exercise/conversion financial

"transaction_action": "derivative exercise/conversion""

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.

one-for-one basis financial

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

vest quarterly financial

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

Form 4 Insider Transactions: What Each Field Means →

04/03/2026 - 07:28 PM

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^*

Wilder Ben Simon

(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)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chief Operating Officer

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		833	A	$0⁽¹⁾	3,201.47	D
Ordinary Shares	04/01/2026		M		500	A	$0⁽¹⁾	3,701.47	D
Ordinary Shares	04/02/2026		S		683	D	$13.3112	3,018.47	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			833	⁽²⁾	⁽²⁾	Ordinary Shares	833	$0	4,998	D
Restricted Stock Units	⁽¹⁾	04/01/2026		M			500	⁽³⁾	⁽³⁾	Ordinary Shares	500	$0	5,000	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, July 1, and October 1, 2027.

3. 500 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

FAQ

What insider transactions did Arqit Quantum (ARQQ) COO Wilder Ben Simon report?

He reported exercising 1,333 Restricted Stock Units into ordinary shares at a $0.00 price and selling 683 ordinary shares in an open-market transaction. These moves reflect routine equity compensation vesting combined with a relatively small sale of existing holdings.

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

He sold 683 ordinary shares at an average price of $13.3112 per share. This open-market sale followed the conversion of RSUs into ordinary shares and left him with 3,018.47 ordinary shares held directly after the reported transactions.

How many Restricted Stock Units did the Arqit Quantum (ARQQ) COO convert to shares?

He exercised 1,333 Restricted Stock Units, which converted into 1,333 Arqit Quantum ordinary shares on a one-for-one basis. The exercise price was $0.00, consistent with RSUs functioning as share-based compensation rather than a traditional option purchase.

How many Arqit Quantum (ARQQ) shares does Wilder Ben Simon hold after these transactions?

Following the reported RSU conversions and the subsequent sale, he directly holds 3,018.47 ordinary shares. This figure reflects his remaining position after the 683-share open-market sale disclosed in the filing, providing context on his ongoing equity stake.

How do Arqit Quantum (ARQQ) RSUs held by the COO vest over time?

The RSUs vest quarterly in equal installments on specified dates. One footnote notes vesting on April 1, July 1, and October 1, 2026, and January 1, April 1, July 1, and October 1, 2027, with another schedule extending vesting dates out through 2028.

What is the conversion ratio for Arqit Quantum (ARQQ) RSUs to ordinary shares?

Each Restricted Stock Unit converts into one Arqit Quantum ordinary share on a one-for-one basis. This means that the 1,333 RSUs exercised by the COO resulted in 1,333 ordinary shares being issued, aligning the number of units with the number of underlying shares.