Comparable stake leader
Heritage Assets Scsp
SEC ownership of Arqit Quantum Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001859690.
Disclosed value leader
d'Ovidio Manfredi Lefebvre
Comparable rows
5/50
Latest evidence
15 Oct 2026
- Public ticker
- ARQQ on Nasdaq
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Heritage Assets Scsp
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
5 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Heritage Assets Scsp
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
15 Oct 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001859690
- Issuer location
- London, United Kingdom
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Arqit Quantum Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Heritage Assets Scsp
Disclosed value leader
d'Ovidio Manfredi Lefebvre
Comparable rows
5/50
Latest evidence
15 Oct 2026
13D/G
3/4/5
13F
Lead comparable stake: 39%
45 rows are not safely comparable across share classes.
13D/G row: Heritage Assets Scsp
Showing 1-8 of 50 holder rows.
Quick read
Heritage Assets Scsp leads the comparable SEC ownership view at 39%.
5 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Heritage Assets Scsp's linked filing trail.
Comparable ownership
Top 5
Heritage Assets Scsp
39%
Notion Capital III LP
10%
D2BW Ltd
5.8%
Evolution Technology Fund II, SCSP.
3.1%
ICS OPPORTUNITIES, LTD.
0.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Heritage Assets Scsp |
13D/G
Manfredi Lefebvre d'Ovidio
|
39%
Reported 13D/G
· 21 May 2026
|
$138,079,960
9,298,314 shares
|
+$388,669 | 21 May 2026 |
| Notion Capital III LP |
13D/G
|
10%
Reported 13D/G
· 26 Jun 2026
|
$43,039,892
1,812,206 shares
|
$0 | 26 Jun 2026 |
| D2BW Ltd |
13D/G
Williams David John
|
5.8%
Reported 13D/G
· 11 Dec 2024
|
$11,990,930
726,723 shares
|
$0 | 11 Dec 2024 |
| Evolution Technology Fund II, SCSP. |
13D/G
The Evolution Technology Fund II SCSP
|
3.1%
Reported 13D/G
· 30 Sep 2024
|
$6,554,774
397,259 shares
|
$0 | 30 Sep 2024 |
| ICS OPPORTUNITIES, LTD. |
13D/G
Millennium Management LLC
|
0.3%
Reported 13D/G
· 16 Jun 2026
|
$943,798
58,621 shares
|
$0 | 16 Jun 2026 |
| d'Ovidio Manfredi Lefebvre |
3/4/5
Director
|
—
mixed-class rows
|
$216,469,818
9,010,469 shares
mixed-class rows
|
-$1,669,120 | 15 Oct 2026 |
| Penserra Capital Management LLC |
13F
Company
|
—
denominator unverified
|
$151,013,000
5,081,219 shares
|
— | 30 Jun 2026 |
| Defiance ETFs, LLC |
13F
Company
|
—
denominator unverified
|
$147,106,813
5,099,023 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$2,904,218.
Buys
$0
Insiders: 0
Sells
$2,904,218
Insiders: 9
Net
-$2,904,218
Shares: -125,100
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 125,100
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 16,114 | $0 | $369,273 | -$369,273 |
| 3-6 | 0 | 90,507 | $0 | $2,330,123 | -$2,330,123 |
| 6-9 | 0 | 18,479 | $0 | $204,822 | -$204,822 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-13 of 13 reporting-owner rows connected to Arqit Quantum Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
13
Largest Forms 3/4/5 holder
d'Ovidio Manfredi Lefebvre
Net 12M change
-$2.9M
Full value: -$2,904,219 · USD · 12-month changeLatest report
15 Oct 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| d'Ovidio Manfredi Lefebvre | Director | $216,469,818 | -$1,669,120 | -0.77% | Mixed | 15 Oct 2026 |
| Carlo Calabria | Director | $5,633,483 | Median | 15 Oct 2026 | ||
| Garth Ritchie | Director | $2,570,888 | -$26,683 | -1% | Median | 15 Oct 2026 |
| Andrew Leaver | Chief Executive Officer | $885,258 | -$581,432 | -40% | Filing P/S | 13 Oct 2026 |
| Paul Feenan | Chief Revenue Officer | $505,892 | -$105,214 | -17% | Filing P/S | 06 Oct 2026 |
| Patrick Willcocks | General Counsel | $271,162 | -$233,445 | -46% | Filing P/S | 06 Oct 2026 |
| Nicholas Pointon | Chief Financial Officer | $257,697 | -$29,667 | -10% | Filing P/S | 20 Apr 2026 |
| Jennifer Bers | Chief Revenue Officer | $143,771 | -$177,529 | -55% | Filing P/S | 22 Jun 2026 |
| Ben Simon Wilder | Chief Operating Officer | $102,655 | -$44,697 | -30% | Filing P/S | 06 Oct 2026 |
| Nicholas William Nilan | General Manager-US | $33,142 | -$36,432 | -52% | Filing P/S | 06 Oct 2026 |
| Cristina Levis | Director | Mixed | 01 May 2026 | |||
| Stephen Charles Chandler | Director | Mixed | 18 Mar 2026 | |||
| Robert Michael Russell | Chief Financial Officer | Mixed | 01 Jun 2026 |
Recent insider transactions for Arqit Quantum Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| d'Ovidio Manfredi Lefebvre | ARQQ | Ordinary Shares | Options Exercise | 1.54% | 817 | 53,924 | 16 Oct 2026 | Direct | ||
| d'Ovidio Manfredi Lefebvre | ARQQ | Restricted Share Units | Options Exercise | -100% | -817 | 0 | 16 Oct 2026 | Direct | ||
| Carlo Calabria | ARQQ | Ordinary Shares | Options Exercise | 0.39% | 919 | 234,147 | 16 Oct 2026 | Direct | ||
| Carlo Calabria | ARQQ | Restricted Share Units | Options Exercise | -100% | -919 | 0 | 16 Oct 2026 | Direct | ||
| Garth Ritchie | ARQQ | Ordinary Shares | Options Exercise | 0.96% | 1,021 | 106,855 | 16 Oct 2026 | Direct | ||
| Garth Ritchie | ARQQ | Restricted Share Units | Options Exercise | -100% | -1,021 | 0 | 16 Oct 2026 | Direct | ||
| d'Ovidio Manfredi Lefebvre | ARQQ | Restricted Share Units | Award | 817 | 817 | 15 Oct 2026 | Direct | |||
| Carlo Calabria | ARQQ | Restricted Share Units | Award | 919 | 919 | 15 Oct 2026 | Direct | |||
| Garth Ritchie | ARQQ | Restricted Share Units | Award | 1,021 | 1,021 | 15 Oct 2026 | Direct | |||
| Andrew Leaver | ARQQ | Ordinary Shares | Sale | -4.55% | -$42,207 | $16.40 | -2,573 | 53,966 | 13 Oct 2026 | Direct |
| Andrew Leaver | ARQQ | Ordinary Shares | Options Exercise | 10.2% | 5,209 | 56,539 | 12 Oct 2026 | Direct | ||
| Andrew Leaver | ARQQ | Restricted Share Units | Options Exercise | -2.7% | -5,209 | 187,500 | 12 Oct 2026 | Direct | ||
| Ben Simon Wilder | ARQQ | Ordinary Shares | Sale | -4.89% | -$5,274 | $24.19 | -218 | 4,243 | 06 Oct 2026 | Direct |
| Nicholas William Nilan | ARQQ | Ordinary Shares | Sale | -26.5% | -$11,926 | $24.19 | -493 | 1,370 | 06 Oct 2026 | Direct |
| Garth Ritchie | ARQQ | Ordinary Shares | Sale | -0.11% | -$2,855 | $24.19 | -118 | 105,834 | 06 Oct 2026 | Direct |
| Patrick Willcocks | ARQQ | Ordinary Shares | Sale | -4.72% | -$13,426 | $24.19 | -555 | 11,209 | 06 Oct 2026 | Direct |
| Paul Feenan | ARQQ | Ordinary Shares | Sale | -2.35% | -$12,193 | $24.19 | -504 | 20,912 | 06 Oct 2026 | Direct |
| Andrew Leaver | ARQQ | Ordinary Shares | Sale | -4.46% | -$58,011 | $24.19 | -2,398 | 51,330 | 06 Oct 2026 | Direct |
| Andrew Leaver | ARQQ | Ordinary Shares | Options Exercise | 10.1% | 5,208 | 56,546 | 05 Oct 2026 | Direct | ||
| Andrew Leaver | ARQQ | Ordinary Shares | Other | -13.5% | -8,027 | 51,338 | 05 Oct 2026 | Direct | ||
| Andrew Leaver | ARQQ | Ordinary Shares | Sale | -4.29% | -$60,294 | $23.78 | -2,535 | 56,547 | 05 Oct 2026 | Direct |
| Andrew Leaver | ARQQ | Restricted Share Units | Options Exercise | -2.63% | -5,208 | 192,709 | 05 Oct 2026 | Direct | ||
| Andrew Leaver | ARQQ | Restricted Share Units | Other | 2.7% | 5,209 | 197,917 | 05 Oct 2026 | Direct | ||
| Carlo Calabria | ARQQ | Ordinary Shares | Options Exercise | 0.11% | 248 | 233,228 | 05 Oct 2026 | Direct | ||
| Carlo Calabria | ARQQ | Restricted Share Units | Options Exercise | -24.8% | -248 | 750 | 05 Oct 2026 | Direct | ||
| Paul Feenan | ARQQ | Ordinary Shares | Sale | -2.43% | -$12,677 | $23.78 | -533 | 21,416 | 05 Oct 2026 | Direct |
| Paul Feenan | ARQQ | Ordinary Shares | Options Exercise | 4.94% | 1,034 | 21,949 | 05 Oct 2026 | Direct | ||
| Paul Feenan | ARQQ | Restricted Share Units | Options Exercise | -42.3% | -1,034 | 1,413 | 05 Oct 2026 | Direct | ||
| d'Ovidio Manfredi Lefebvre | ARQQ | Ordinary Shares | Options Exercise | 2.63% | 1,359 | 53,107 | 05 Oct 2026 | Direct | ||
| d'Ovidio Manfredi Lefebvre | ARQQ | Restricted Share Units | Options Exercise | -57.6% | -1,359 | 1,001 | 05 Oct 2026 | Direct | ||
| Nicholas William Nilan | ARQQ | Ordinary Shares | Sale | -36.6% | -$12,416 | $23.78 | -522 | 904 | 05 Oct 2026 | Direct |
| Nicholas William Nilan | ARQQ | Ordinary Shares | Options Exercise | 106.1% | 959 | 1,863 | 05 Oct 2026 | Direct | ||
| Nicholas William Nilan | ARQQ | Restricted Share Units | Options Exercise | -14.3% | -959 | 5,752 | 05 Oct 2026 | Direct | ||
| Garth Ritchie | ARQQ | Ordinary Shares | Sale | -0.12% | -$3,021 | $23.78 | -127 | 105,952 | 05 Oct 2026 | Direct |
| Garth Ritchie | ARQQ | Ordinary Shares | Options Exercise | 0.23% | 248 | 106,079 | 05 Oct 2026 | Direct | ||
| Garth Ritchie | ARQQ | Restricted Share Units | Options Exercise | -24.8% | -248 | 750 | 05 Oct 2026 | Direct | ||
| Ben Simon Wilder | ARQQ | Ordinary Shares | Sale | -4.96% | -$5,542 | $23.78 | -233 | 4,461 | 05 Oct 2026 | Direct |
| Ben Simon Wilder | ARQQ | Ordinary Shares | Options Exercise | 10.4% | 443 | 4,694 | 05 Oct 2026 | Direct | ||
| Ben Simon Wilder | ARQQ | Restricted Share Units | Options Exercise | -11.7% | -443 | 3,332 | 05 Oct 2026 | Direct | ||
| Patrick Willcocks | ARQQ | Ordinary Shares | Sale | -4.76% | -$13,985 | $23.78 | -588 | 11,764 | 05 Oct 2026 | Direct |
| Patrick Willcocks | ARQQ | Ordinary Shares | Options Exercise | 10.2% | 1,148 | 12,352 | 05 Oct 2026 | Direct | ||
| Patrick Willcocks | ARQQ | Restricted Share Units | Options Exercise | -46.2% | -1,148 | 1,336 | 05 Oct 2026 | Direct | ||
| Patrick Willcocks | ARQQ | Ordinary Shares | Sale | -4.74% | -$13,632 | $24.47 | -557 | 11,204 | 02 Oct 2026 | Direct |
| Patrick Willcocks | ARQQ | Ordinary Shares | Options Exercise | 10.8% | 1,148 | 11,761 | 02 Oct 2026 | Direct | ||
| Patrick Willcocks | ARQQ | Restricted Share Units | Options Exercise | -43.6% | -1,148 | 1,485 | 02 Oct 2026 | Direct | ||
| Ben Simon Wilder | ARQQ | Ordinary Shares | Sale | -4.94% | -$5,409 | $24.47 | -221 | 4,251 | 02 Oct 2026 | Direct |
| Ben Simon Wilder | ARQQ | Ordinary Shares | Options Exercise | 11% | 445 | 4,472 | 02 Oct 2026 | Direct | ||
| Ben Simon Wilder | ARQQ | Restricted Share Units | Options Exercise | -11% | -445 | 3,609 | 02 Oct 2026 | Direct | ||
| Garth Ritchie | ARQQ | Ordinary Shares | Sale | -0.11% | -$2,961 | $24.47 | -121 | 105,831 | 02 Oct 2026 | Direct |
| Garth Ritchie | ARQQ | Ordinary Shares | Options Exercise | 0.24% | 250 | 105,952 | 02 Oct 2026 | Direct |
* marks a reported price that did not pass the local price check.