Arqit Quantum director reports initial holdings

Q: What equity holdings does ARQQ director Ritchie Garth report on this Form 3?

Ritchie Garth reports direct ownership of 28,261 ordinary shares of Arqit Quantum Inc. He also discloses warrants and multiple Restricted Stock Unit awards that, upon exercise or vesting, each convert into one additional ARQQ ordinary share, increasing his potential future equity stake.

Q: How many ARQQ shares are underlying Ritchie Garth’s warrants and at what exercise price?

Garth holds Ordinary Share Purchase Warrants over 73,562 ARQQ ordinary shares with an exercise price of $2.5000 per share. Each warrant allows him to buy one ordinary share at that price any time before the stated expiration date.

Q: What Restricted Stock Units does ARQQ director Ritchie Garth hold and how do they work?

Garth holds several Restricted Stock Unit (RSU) awards, each RSU giving a contingent right to receive one ARQQ ordinary share. These RSUs vest in equal quarterly installments on specified dates from April 1, 2026 through various dates extending into 2028.

Q: Over what period do Ritchie Garth’s ARQQ RSUs vest according to the disclosure?

The RSUs vest quarterly on specified dates. Footnotes state installments on April 1, July 1, and October 1, 2026, and January 1 and April 1, 2027, with other grants extending vesting quarterly through multiple dates into 2028, subject to continued service conditions.

Arqit Quantum Inc. director Ritchie Garth reports his existing equity interests in the company.

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Form Type

Rhea-AI Filing Summary

Arqit Quantum Inc. director Ritchie Garth reports his existing equity interests in the company. He directly holds 28,261 ordinary shares.

He also holds Ordinary Share Purchase Warrants exercisable at $2.5000 per share for 73,562 ordinary shares until September 30, 2026, plus several Restricted Stock Unit awards, each RSU representing a contingent right to receive one ordinary share with vesting in quarterly installments through 2028.

Insider Trade Summary

6 transactions reported

Mixed 6 txns

Insider Ritchie Garth

Role Director

Type	Security	Shares	Price	Value
holding	Ordinary Share Purchase Warrants (right to buy)	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Ordinary Shares	--	--	--

Holdings After Transaction: Ordinary Share Purchase Warrants (right to buy) — 73,562 contracts (Direct); Restricted Stock Units — 6,351 contracts (Direct); Ordinary Shares — 28,261 shares (Direct)

Footnotes (5)

F1. Each Ordinary Share Purchase Warrant can be exercised at any time, at the holder's election, to purchase one ARQQ ordinary share.
F2. 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.
F3. 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.
F4. 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.
F5. 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, and January 1, April 1, July 1, and October 1, 2028.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What equity holdings does ARQQ director Ritchie Garth report on this Form 3?

Ritchie Garth reports direct ownership of 28,261 ordinary shares of Arqit Quantum Inc. He also discloses warrants and multiple Restricted Stock Unit awards that, upon exercise or vesting, each convert into one additional ARQQ ordinary share, increasing his potential future equity stake.

How many ARQQ shares are underlying Ritchie Garth’s warrants and at what exercise price?

Garth holds Ordinary Share Purchase Warrants over 73,562 ARQQ ordinary shares with an exercise price of $2.5000 per share. Each warrant allows him to buy one ordinary share at that price any time before the stated expiration date.

What Restricted Stock Units does ARQQ director Ritchie Garth hold and how do they work?

Garth holds several Restricted Stock Unit (RSU) awards, each RSU giving a contingent right to receive one ARQQ ordinary share. These RSUs vest in equal quarterly installments on specified dates from April 1, 2026 through various dates extending into 2028.

When do Ritchie Garth’s ARQQ warrants expire and what shares do they cover?

The Ordinary Share Purchase Warrants reported by Garth expire on September 30, 2026. Each warrant is exercisable at any time before expiration to purchase one ARQQ ordinary share, covering an aggregate of 73,562 underlying ordinary shares at the stated exercise price.

Over what period do Ritchie Garth’s ARQQ RSUs vest according to the disclosure?

The RSUs vest quarterly on specified dates. Footnotes state installments on April 1, July 1, and October 1, 2026, and January 1 and April 1, 2027, with other grants extending vesting quarterly through multiple dates into 2028, subject to continued service conditions.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/18/2026 - 11:16 AM EDT

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

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Ritchie Garth

(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	28,261	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)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	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)
Ordinary Share Purchase Warrants (right to buy)	⁽¹⁾	09/30/2026	Ordinary Shares	73,562	$2.5	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. 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, 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)

Source: View Original Filing on SEC EDGAR