STOCK TITAN

Director at Arqit Quantum (ARQQ) exercises RSUs, gains 1,051 shares

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

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.

Positive

  • None.

Negative

  • None.
Insider Calabria Carlo
Role Director
Type Security Shares Price Value
Exercise Restricted Stock Units 50 $0.00 --
Exercise Restricted Stock Units 250 $0.00 --
Exercise Restricted Stock Units 250 $0.00 --
Exercise Restricted Stock Units 501 $0.00 --
Exercise Ordinary Shares 50 $0.00 --
Exercise Ordinary Shares 250 $0.00 --
Exercise Ordinary Shares 250 $0.00 --
Exercise Ordinary Shares 501 $0.00 --
Holdings After Transaction: Restricted Stock Units — 50 shares (Direct); Ordinary Shares — 108,223 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, and July 1, 2026. 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, July 1, and October 1, 2026, and January 1, April 1, and July 1, 2027. 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.
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
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.
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*
Calabria Carlo

(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)
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 Shares04/01/2026M50A$0(1)108,223D
Ordinary Shares04/01/2026M250A$0(1)108,473D
Ordinary Shares04/01/2026M250A$0(1)108,723D
Ordinary Shares04/01/2026M501A$0(1)109,224D
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)04/01/2026M50 (2) (2)Ordinary Shares50$050D
Restricted Stock Units(1)04/01/2026M250 (3) (3)Ordinary Shares250$01,501D
Restricted Stock Units(1)04/01/2026M250 (4) (4)Ordinary Shares250$01,250D
Restricted Stock Units(1)04/01/2026M501 (5) (5)Ordinary Shares501$02,499D
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-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)

FAQ

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.