STOCK TITAN

[Form 4] Arqit Quantum Inc. Insider Trading Activity

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

Rhea-AI Filing Summary

Arqit Quantum Inc. director Lefebvre d'Ovidio Manfredi exercised restricted stock units and increased his share holdings. On May 6 and 7, 2026, he exercised RSUs covering 1,509 and 1,082 ordinary shares at $0.00 per share, receiving the same number of ordinary shares.

Following these exercises, his direct ownership in Arqit ordinary shares rose to 44,217 shares. The RSUs convert into ordinary shares on a one-for-one basis and vested immediately on the grant date. A separate entry shows 4,396,891 ordinary shares beneficially owned indirectly through Heritage Assets SCSP.

Positive

  • None.

Negative

  • None.
Insider Lefebvre d'Ovidio Manfredi
Role null
Type Security Shares Price Value
Grant/Award Restricted Stock Units 1,082 $0.00 --
Exercise Restricted Stock Units 1,082 $0.00 --
Exercise Ordinary Shares 1,082 $0.00 --
Grant/Award Restricted Stock Units 1,509 $0.00 --
Exercise Restricted Stock Units 1,509 $0.00 --
Exercise Ordinary Shares 1,509 $0.00 --
holding Ordinary Shares -- -- --
Holdings After Transaction: Restricted Stock Units — 1,082 shares (Direct, null); Ordinary Shares — 44,217 shares (Direct, null); Ordinary Shares — 4,396,891 shares (Indirect, beneficially owned through Heritage Assets SCSP)
Footnotes (1)
  1. [object Object]
RSUs exercised May 6, 2026 1,509 shares Restricted Stock Units converting into ordinary shares
RSUs exercised May 7, 2026 1,082 shares Restricted Stock Units converting into ordinary shares
Total RSUs exercised 2,591 shares Exercise or conversion of derivative securities
Direct ordinary shares after transactions 44,217 shares Total direct ownership following exercises
Indirect ordinary shares 4,396,891 shares Beneficially owned through Heritage Assets SCSP
RSU conversion price $0.00 per share Stated price per share for RSU conversions
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 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.
beneficially owned financial
"beneficially owned through Heritage Assets SCSP"
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
Heritage Assets SCSP financial
"beneficially owned through Heritage Assets SCSP"
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*
Lefebvre d'Ovidio Manfredi

(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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/06/2026
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 Shares05/06/2026M1,509A$0(1)43,135D
Ordinary Shares05/07/2026M1,082A$0(1)44,217D
Ordinary Shares4,396,891Ibeneficially owned through Heritage Assets SCSP
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)05/06/2026A1,509 (1) (1)Ordinary Shares1,509$01,509D
Restricted Stock Units(1)05/06/2026M1,509 (1) (1)Ordinary Shares1,509$00D
Restricted Stock Units(1)05/07/2026A1,082 (1) (1)Ordinary Shares1,082$01,082D
Restricted Stock Units(1)05/07/2026M1,082 (1) (1)Ordinary Shares1,082$00D
Explanation of Responses:
1. Restricted Stock Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis. The RSUs vested immediately on the date of grant.
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-Fact05/08/2026
** 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)

FAQ

What insider transactions did ARQQ director Lefebvre d'Ovidio Manfredi report?

He reported exercising restricted stock units on two dates, converting 1,509 and 1,082 RSUs into the same number of Arqit ordinary shares at $0.00 per share. These are compensation-related derivative exercises rather than open-market share purchases or sales.

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

After the reported RSU exercises, Lefebvre d'Ovidio Manfredi directly holds 44,217 Arqit ordinary shares. This figure reflects his direct ownership position following the conversions of restricted stock units into ordinary shares disclosed in the Form 4 filing.

What indirect Arqit (ARQQ) share holdings are disclosed in the Form 4?

The filing discloses an indirect holding of 4,396,891 Arqit ordinary shares, described as beneficially owned through Heritage Assets SCSP. This entry reflects shares held via an entity rather than directly, as of the holding information dated May 6, 2026.

How many restricted stock units did the ARQQ director exercise in total?

Across the reported transactions, he exercised RSUs covering a total of 2,591 ordinary shares (1,509 plus 1,082). Each restricted stock unit converts into one Arqit ordinary share, according to the footnote describing the RSU terms in the Form 4.

Were the ARQQ insider transactions open-market buys or sells?

No, the Form 4 shows derivative exercises and grants, coded as M and A, rather than open-market purchases or sales. The ordinary shares were received by converting restricted stock units at a stated price of $0.00 per share, consistent with equity compensation.

What does the Form 4 say about ARQQ restricted stock unit conversion terms?

A footnote explains that Arqit restricted stock units convert into ARQQ ordinary shares on a one-for-one basis. It also states that the RSUs involved in these transactions vested immediately on the date of grant, clarifying how and when they became eligible for conversion.