Arqit Quantum (NASDAQ: ARQQ) executive reports 8,631 RSUs in Form 3

Rhea-AI Filing Summary

Arqit Quantum Inc. executive Nilan Nicholas William, General Manager-US, reported his initial beneficial ownership on a Form 3. He holds restricted stock units tied to 8,631 ordinary shares, each RSU representing a contingent right to receive one ordinary share.

According to the vesting schedule, 2,879 RSUs are scheduled to vest on October 1, 2026. The remaining RSUs vest in equal quarterly installments on January 1, April 1, July 1, and October 1 of 2027 and 2028, reflecting a multi-year equity compensation structure.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Nilan Nicholas William

Role General Manager-US

Type	Security	Shares	Price	Value
holding	Restricted Stock Units	--	--	--

Holdings After Transaction: Restricted Stock Units — 8,631 shares (Direct)

Footnotes (1)

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Understanding Insider Trading Forms →

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^*

Nilan Nicholas William

(Last) (First) (Middle)

C/O ARQIT INC.

1209 ORANGE STREET

(Street)

WILMINGTON 19801

(City) (State) (Zip)

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	General Manager-US

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)

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
Restricted Stock Units	(1)	(1)	Ordinary Shares	8,631	(1)	D

Explanation of Responses:

1. Each restricted stock unit ("RSU") represents a contingent right to receive one ARQQ ordinary share. 2,879 RSUs vest on October 1, 2026 and the remaining RSUs vest quarterly in equal installments on 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 the ARQQ Form 3 filing by Nilan Nicholas William report?

The Form 3 reports Nilan Nicholas William’s initial beneficial ownership in Arqit Quantum. He holds restricted stock units linked to 8,631 ordinary shares, providing contingent rights to receive shares as they vest over a defined multi-year schedule through 2028.

How many Arqit Quantum (ARQQ) shares are linked to the reported RSUs?

The reported restricted stock units are linked to 8,631 Arqit Quantum ordinary shares. Each RSU represents a contingent right to receive one ordinary share, meaning the full position could convert into 8,631 shares as vesting conditions are satisfied.

What is the vesting schedule for Nilan Nicholas William’s ARQQ RSUs?

The vesting schedule starts with 2,879 RSUs vesting on October 1, 2026. The remaining RSUs vest in equal quarterly installments on January 1, April 1, July 1, and October 1 of 2027 and 2028, creating a staggered, long-term equity timeline.

Are the ARQQ restricted stock units held by Nilan Nicholas William directly?

Yes. The filing classifies the RSU ownership as direct. The derivative summary lists restricted stock units with underlying ordinary shares and identifies the ownership type as direct, indicating they are attributed personally rather than through an intermediary entity.

Does the ARQQ Form 3 show any insider buying or selling activity?

No specific buying or selling activity is shown in this Form 3. It records a holding of restricted stock units tied to 8,631 ordinary shares, focusing on initial beneficial ownership and vesting terms rather than reporting open-market or other transactional activity.