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  4. [Form 4] Arqit Quantum Inc. Insider Trading Activity

Arqit Quantum (NASDAQ: ARQQ) director-linked entity sells 396 warrants

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

Rhea-AI Filing Summary

Through Heritage Assets SCSp, director Lefebvre d'Ovidio Manfredi sold 396 Business Combination Warrants of Arqit Quantum Inc. in open-market trades on May 4–5, 2026 at prices between $2.10 and $2.30 per warrant. After these small sales, the reporting person still beneficially owns 633,630 warrants, equivalent to 25,345.20 ordinary shares if fully exercised.

Positive

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Negative

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Insider Lefebvre d'Ovidio Manfredi
Role null
Sold 396 shs ($845.20)
Type Security Shares Price Value
Sale Business Combination Warrants (right to buy) 68 $2.30 $156.40
Sale Business Combination Warrants (right to buy) 328 $2.10 $688.80
Holdings After Transaction: Business Combination Warrants (right to buy) — 25,345.2 shares (Indirect, Beneficially owned through Heritage Assets SCSp)
Footnotes (1)
  1. [object Object]
Warrants sold 396 Business Combination Warrants Open-market sales on May 4–5, 2026
Sale prices $2.10 and $2.30 per warrant 328 warrants at $2.10; 68 at $2.30
Warrants remaining 633,630 Business Combination Warrants Beneficially owned after reported transactions
Ordinary share equivalent 25,345.20 ordinary shares If all 633,630 warrants are exercised, post-split
Warrant exercise price $11.50 per warrant Exercise price for Business Combination Warrants
Exercise ratio 0.04 ordinary share per warrant Post 1-for-25 reverse stock split terms
Reverse split ratio 1-for-25 Every 25 ordinary shares consolidated into one
Warrant expiration September 3, 2026 Expiration date for Business Combination Warrants
Business Combination Warrants financial
"The reporting person beneficially owns 633,630 Business Combination Warrants"
reverse stock split financial
"announced the implementation of a reverse stock split whereby every 25 outstanding ARQQ ordinary shares"
A reverse stock split is when a company reduces the number of its shares outstanding, making each share more valuable. For example, if you own 100 shares worth $1 each, a 1-for-10 reverse split would turn your 100 shares into 10 shares worth $10 each. Companies often do this to boost their stock price and appear more stable to investors.
beneficially owns financial
"The reporting person beneficially owns 633,630 Business Combination Warrants"
Beneficially owns means a person or entity enjoys the economic benefits and control of a security even if the legal title or registration is held in another name. Think of it like having the keys and profits from a car that is registered to a friend: you use it, benefit from it, and make decisions about it even though the official paperwork lists someone else. For investors, this matters because it reveals who truly controls shares, affects voting power, potential conflicts of interest, and regulatory disclosure obligations.
exercise price financial
"Each Business Combination Warrant has an exercise price of $11.50"
The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.
ordinary share financial
"would be equivalent to 25,345.20 ARQQ ordinary shares on a post-reverse stock split basis"
An ordinary share is a unit of ownership in a company that gives the holder a stake in its profits and usually the right to vote on key decisions. Think of it like a slice of a pizza where each slice entitles you to a portion of what’s left after bills are paid; value can rise or fall with the business and may pay dividends, so it matters to investors for income, growth and control.
Form 4 Insider Transactions: What Each Field Means →
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)
05/04/2026		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
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
Business Combination Warrants (right to buy)(1)05/04/2026S328 (1)09/03/2026Ordinary Shares328$2.125,413.04IBeneficially owned through Heritage Assets SCSp
Business Combination Warrants (right to buy)(1)05/05/2026S68 (1)09/03/2026Ordinary Shares68$2.325,345.2IBeneficially owned through Heritage Assets SCSp
Explanation of Responses:
1. On September 19, 2024, Arqit Quantum Inc. (ARQQ) announced the implementation of a reverse stock split whereby every 25 outstanding ARQQ ordinary shares were consolidated into one ordinary share, par value $0.0025 per share. Each Business Combination Warrant has an exercise price of $11.50 and can be exercised at any time, at the holder's election, to purchase 0.04 of an ARQQ ordinary share on a post-reverse stock split basis, and cannot be exercised for fractional shares. Accordingly, on a post-reverse stock split basis holders of Business Combination Warrants are required to exercise at least 25 Business Combination Warrants in order to receive one whole ARQQ ordinary share at an aggregate exercise price of $287.50 per whole ARQQ ordinary share. The reporting person beneficially owns 633,630 Business Combination Warrants, which, if exercised in full, would be equivalent to 25,345.20 ARQQ ordinary shares on a post-reverse stock split basis.
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/ Amir Heyat, as Attorney-in-Fact05/06/2026
** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did Arqit Quantum Inc. (ARQQ) report in this Form 4?

Arqit Quantum Inc. reported open-market sales of 396 Business Combination Warrants linked to its ordinary shares. These sales occurred on May 4–5, 2026 at prices between $2.10 and $2.30 per warrant, through Heritage Assets SCSp associated with director Lefebvre d'Ovidio Manfredi.

Who is the reporting person in the Arqit Quantum Inc. (ARQQ) Form 4 filing?

The reporting person is director Lefebvre d'Ovidio Manfredi, with the warrants beneficially owned through Heritage Assets SCSp. The Form 4 attributes the transactions to this indirect ownership structure, clarifying how the director’s economic interest in the Business Combination Warrants is held.

How many Arqit Quantum (ARQQ) Business Combination Warrants were sold and at what prices?

A total of 396 Business Combination Warrants were sold: 328 warrants at $2.10 each on May 4, 2026, and 68 warrants at $2.30 each on May 5, 2026. Both transactions were reported as open-market sales by the indirectly owned entity.

How many Arqit Quantum (ARQQ) warrants does the reporting person still beneficially own after these sales?

After these transactions, the reporting person beneficially owns 633,630 Business Combination Warrants. According to the filing, if exercised in full, these warrants would be equivalent to 25,345.20 Arqit Quantum ordinary shares on a post-reverse stock split basis, reflecting significant remaining exposure.

What did the reverse stock split mean for Arqit Quantum (ARQQ) ordinary shares and warrants?

On September 19, 2024, Arqit Quantum implemented a 1-for-25 reverse stock split of its ordinary shares. Following this, each Business Combination Warrant can purchase 0.04 of a post-split ordinary share, and holders must exercise at least 25 warrants to receive one whole ordinary share.

What is the exercise price and structure of Arqit Quantum (ARQQ) Business Combination Warrants?

Each Business Combination Warrant carries an exercise price of $11.50. On a post-reverse split basis, holders must exercise 25 warrants to obtain one whole ordinary share at an aggregate exercise price of $287.50, and warrants cannot be exercised for fractional shares under the disclosed terms.