Arqit Quantum (ARQQ) director discloses shares, warrants and RSUs stake

Rhea-AI Filing Summary

Arqit Quantum Inc. director Carlo Calabria filed an initial ownership statement showing a mix of ordinary shares, warrants, and restricted stock units. He directly holds 108,173 ordinary shares. He also holds warrants exercisable for 120,000 ordinary shares at an exercise price of 2.50 per share expiring on September 30, 2026, and additional warrants for 10,257 ordinary shares at 19.50 per share expiring on September 12, 2028.

Calabria’s equity awards include several blocks of restricted stock units, covering 100, 1,500, 1,751, and 3,000 underlying ordinary shares. According to the vesting schedules, these RSUs convert into ordinary shares over multiple quarterly dates from April 1, 2026 through October 1, 2028, aligning his compensation with the company’s longer-term performance.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Calabria Carlo

(Last) (First) (Middle)

C/O ARQIT INC.

1209 ORANGE STREET

(Street)

WILMINGTON DELAWARE 19801

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
Arqit Quantum Inc. [ ARQQ ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

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

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary Shares	108,173	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Ordinary Share Purchase Warrants (right to buy)	(1)	09/30/2026	Ordinary Shares	120,000	$2.5	D
Ordinary Share Purchase Warrants (right to buy)	(1)	09/12/2028	Ordinary Shares	10,257	$19.5	D
Restricted Stock Units	(2)	(2)	Ordinary Shares	100	(2)	D
Restricted Stock Units	(3)	(3)	Ordinary Shares	1,500	(3)	D
Restricted Stock Units	(4)	(4)	Ordinary Shares	1,751	(4)	D
Restricted Stock Units	(5)	(5)	Ordinary Shares	3,000	(5)	D

Explanation of Responses:

1. Each Ordinary Share Purchase Warrant can be exercised at any time, at the holder's election, to purchase one ARQQ ordinary share.

2. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one ARQQ ordinary share. The RSUs vest quarterly in equal installments on April 1, and July 1, 2026.

3. Each RSU represents a contingent right to receive one ARQQ ordinary share. 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.

4. Each RSU represents a contingent right to receive one ARQQ ordinary share. 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. Each RSU represents a contingent right to receive one ARQQ ordinary share. 501 RSUs vest 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. Ex. 24 - Power of Attorney

	/s/ Nicholas Pointon, as Attorney-in-Fact	03/18/2026
	** 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 5 (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 3: SEC 1473 (03-26)

FAQ

What does Carlo Calabria’s Form 3 filing for Arqit Quantum (ARQQ) show?

The Form 3 shows Carlo Calabria’s initial holdings in Arqit Quantum, including 108,173 ordinary shares, warrants over 130,257 shares, and several RSU grants that vest gradually from April 2026 through October 2028, tying compensation to future performance.

How many Arqit Quantum (ARQQ) ordinary shares does Carlo Calabria directly own?

Carlo Calabria directly owns 108,173 ordinary shares of Arqit Quantum. This position is separate from his derivative securities, which include warrants and RSUs that may convert into additional ordinary shares over time as they vest or are exercised.

What warrant positions does Carlo Calabria report in Arqit Quantum (ARQQ)?

He reports two warrant positions: one exercisable for 120,000 ordinary shares at 2.50 per share expiring September 30, 2026, and another for 10,257 ordinary shares at 19.50 per share expiring September 12, 2028, both held directly.

What restricted stock units (RSUs) does Carlo Calabria hold in Arqit Quantum (ARQQ)?

Calabria holds several RSU grants over 100, 1,500, 1,751, and 3,000 underlying ordinary shares. Each RSU converts into one ordinary share, vesting quarterly on dates between April 1, 2026 and October 1, 2028, according to the detailed schedules.

When do Carlo Calabria’s Arqit Quantum (ARQQ) RSUs vest?

The RSUs vest quarterly across multiple schedules. Vesting dates begin on April 1, 2026 and recur on specified quarterly dates through October 1, 2028, gradually delivering ordinary shares as long as vesting conditions are satisfied over time.

Does Carlo Calabria’s Form 3 reflect any recent Arqit Quantum (ARQQ) share purchases or sales?

The filing lists holdings only, not new market purchases or sales. It discloses his existing ordinary shares, warrants, and RSUs as of the reporting date, serving as a baseline record of his beneficial ownership as a director.