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  4. [Form 4] Arqit Quantum Inc. Insider Trading Activity

Arqit Quantum (NASDAQ: ARQQ) counsel sells 1,790 shares after RSU exercises

Filing Impact
(Neutral)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Arqit Quantum Inc. General Counsel Patrick Willcocks reported a mix of equity exercises and a sale of company stock. On April 1, 2026, he exercised Restricted Stock Units (RSUs) that converted one-for-one into 3,563 ordinary shares at a conversion price of $0.00 per share, consistent with the RSU footnotes. On April 2, 2026, he executed an open-market sale of 1,790 ordinary shares at $13.3233 per share. After these transactions, he directly held 11,916 ordinary shares, so he retained a meaningful equity position in the company.

Positive

  • None.

Negative

  • None.

Insights

Routine RSU exercises paired with a modest open-market sale, with the insider retaining a substantial position.

General Counsel Patrick Willcocks exercised RSUs that converted one-for-one into 3,563 Arqit Quantum ordinary shares at a stated conversion price of $0.00. This reflects compensation vesting and derivative exercise activity rather than an open-market purchase decision.

He then sold 1,790 ordinary shares on April 2, 2026 at $13.3233 per share in an open-market transaction. Following the sale, he held 11,916 ordinary shares directly, indicating that the sale represents only a portion of his visible equity stake.

Insider Willcocks Patrick
Role General Counsel
Sold 1,790 shs ($24K)
Type Security Shares Price Value
Sale Ordinary Shares 1,790 $13.3233 $24K
Exercise Restricted Stock Units 2,083 $0.00 --
Exercise Restricted Stock Units 116 $0.00 --
Exercise Restricted Stock Units 916 $0.00 --
Exercise Restricted Stock Units 448 $0.00 --
Exercise Ordinary Shares 2,083 $0.00 --
Exercise Ordinary Shares 116 $0.00 --
Exercise Ordinary Shares 448 $0.00 --
Exercise Ordinary Shares 916 $0.00 --
Holdings After Transaction: Ordinary Shares — 11,916 shares (Direct); Restricted Stock Units — 12,495 shares (Direct)
Footnotes (1)
  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. The RSUs vest quarterly in equal installments on April 1, and July 1, 2026. 916 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. 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.
Shares sold 1,790 shares Open-market sale of Arqit Quantum ordinary shares
Sale price per share $13.3233 per share Price for 1,790 ordinary shares sold on April 2, 2026
RSUs exercised 3,563 RSUs Total RSUs converting into ordinary shares on April 1, 2026
Conversion price $0.00 per share RSUs converted one-for-one into ordinary shares at stated price
Shares held after transactions 11,916 shares Directly owned ordinary shares following sale and exercises
Transaction date (sale) April 2, 2026 Date of open-market sale of 1,790 shares
Transaction date (RSU exercises) April 1, 2026 Date RSUs were exercised into ordinary shares
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.
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.
vest quarterly financial
"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."
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
Willcocks Patrick
(Last)(First)(Middle)
3 ORCHARD PLACE
(Street)
LONDONSW1H 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)
Director10% Owner
XOfficer (give title below)Other (specify below)
General Counsel
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
04/01/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Ordinary Shares04/01/2026M2,083A$0(1)12,226D
Ordinary Shares04/01/2026M116A$0(1)12,342D
Ordinary Shares04/01/2026M448A$0(1)12,790D
Ordinary Shares04/01/2026M916A$0(1)13,706D
Ordinary Shares04/02/2026S1,790D$13.323311,916D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units(1)04/01/2026M2,083 (2) (2)Ordinary Shares2,083$012,495D
Restricted Stock Units(1)04/01/2026M116 (3) (3)Ordinary Shares116$0110D
Restricted Stock Units(1)04/01/2026M916 (4) (4)Ordinary Shares916$09,155D
Restricted Stock Units(1)04/01/2026M448 (5) (5)Ordinary Shares448$02,232D
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. The RSUs vest quarterly in equal installments on April 1, and July 1, 2026.
4. 916 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.
5. 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.
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-Fact04/03/2026
** Signature of Reporting PersonDate
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