Here are the Form 4 insider transactions from Arqit Quantum Inc. (ARQQ) in our archive over the last 12 months, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow ARQQ and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full ARQQ filings page.
Arqit Quantum Inc. director d'Ovidio Manfredi Lefebvre reported 8,942,448 ordinary shares beneficially owned indirectly through Heritage Assets SCSP as of October 1, 2026. The amendment incorporates total indirect holdings after the reporting person's transactions reported for June 30 and July 1, 2026. The entry records a holding, not a purchase or sale.
Arqit Quantum Inc. director d'Ovidio Manfredi Lefebvre is listed with 4,342,448 ordinary shares beneficially owned through Heritage Assets SCSP. The amendment incorporates total indirect holdings after the reporting person exercised a reported transaction on September 22, 2026.
Arqit Quantum Inc. director d'Ovidio Manfredi Lefebvre received a grant of 817 restricted share units (RSUs) on October 15, 2026; the RSUs vested within the week of the grant date. On October 16, 2026, they converted one-for-one into 817 ordinary shares, leaving him with 53,924 directly held ordinary shares. Separately, 8,942,448 ordinary shares were beneficially owned through Heritage Assets SCSP as of October 15, 2026.
Arqit Quantum Inc. director Carlo Calabria received a grant of 919 restricted share units on October 15, 2026. The RSUs vested within the week of grant and converted on October 16, 2026, into 919 ordinary shares on a one-for-one basis. After conversion, his reported direct holdings were 234,147 ordinary shares.
Arqit Quantum Inc. director Garth Ritchie received 1,021 restricted share units on October 15, 2026. On October 16, he converted 1,021 RSUs into 1,021 ordinary shares; the units vested within the week of the grant date and convert into ordinary shares on a one-for-one basis. His reported direct holdings after the conversion were 106,855 ordinary shares.
Arqit Quantum Inc. Chief Executive Officer Andrew Leaver sold 2,573 ordinary shares on October 13, 2026, at $16.4040 per share. After the sale, he directly held 53,966 ordinary shares. Arqit states that, as a foreign private issuer, the reporting person's transactions are exempt from Sections 16(b) and 16(c) of the Securities Exchange Act of 1934.
Arqit Quantum Inc. Chief Executive Officer Andrew Leaver converted 5,209 restricted share units into 5,209 ordinary shares on October 12, 2026, on a one-for-one basis. After conversion, his reported direct holdings were 56,539 ordinary shares and 187,500 restricted share units. The reported schedule lists quarterly vesting dates from October 1, 2026, through October 1, 2029.
Arqit Quantum Inc. Chief Operating Officer Ben Simon Wilder reported a sale of 218 ordinary shares on October 6, 2026, at $24.1915 per share, in a transaction described as an open-market or private transaction. His reported direct holdings afterward were 4,243 shares, and no Rule 10b5-1 plan is reported.
Arqit Quantum Inc.'s General Manager-US, Nicholas William Nilan, reported selling 493 Ordinary Shares on October 6, 2026, at $24.1915 per share. He reported 1,370 directly held Ordinary Shares following the transaction; no Rule 10b5-1 plan is reported.
Garth Ritchie, a director of Arqit Quantum Inc. (ARQQ), reported selling 118 Ordinary Shares on October 6, 2026, at $24.1915 per share in an open-market or private transaction. His reported direct holdings after the sale were 105,834 Ordinary Shares. No Rule 10b5-1 plan is reported.
Arqit Quantum Inc. (ARQQ) General Counsel Patrick Willcocks sold 555 ordinary shares on October 6, 2026, at 24.1915 per share. The sale was reported as direct, and his reported direct holdings afterward were 11,209 ordinary shares. The sale was not reported as made under a Rule 10b5-1 plan. Arqit stated that, because it is a foreign private issuer, the reporting person's transactions in its securities are exempt from Sections 16(b) and 16(c) of the Act.
Arqit Quantum Inc. (ARQQ) Chief Revenue Officer Paul Feenan reported a direct sale of 504 ordinary shares on October 6, 2026, at $24.1915 per share. The transaction is described as a sale in an open-market or private transaction. His reported direct holdings after the sale were 20,912 ordinary shares. No Rule 10b5-1 plan is reported.
Arqit Quantum Inc. (ARQQ) Chief Executive Officer Andrew Leaver sold 2,398 ordinary shares at $24.1915 per share on October 6, 2026. The shares were held directly, and he reported 51,330 ordinary shares following the sale. No Rule 10b5-1 plan is reported. Arqit Quantum stated that, as a foreign private issuer under Rule 3a12-3(b), the reporting person’s transactions are exempt from Sections 16(b) and 16(c) of the Securities Exchange Act of 1934.
Arqit Quantum Inc. Chief Executive Officer Andrew Leaver reported transactions on October 5, 2026, including conversion of 5,208 restricted share units into ordinary shares and a sale of 2,535 ordinary shares at $23.7847 per share. Other entries report an acquisition of 5,209 RSUs, a disposition involving 5,208 RSUs, and dispositions of 5,209 and 2,818 ordinary shares. A related footnote says a trade cancelled an October 2 sell-to-cover transaction to correct the tax rate and number of units sold. RSUs convert one-for-one into ordinary shares.
Arqit Quantum Inc. (ARQQ) director Carlo Calabria reported four restricted share unit (RSU) conversions on October 5, 2026: RSU positions of 16, 66, 83 and 83 units were disposed of as corresponding ordinary shares were acquired. The RSUs convert into ordinary shares on a one-for-one basis, and the transactions list 248 ordinary shares acquired.
The awards vest in equal quarterly installments on schedules beginning October 1, 2026; the longest schedule runs through October 1, 2028.
Arqit Quantum Inc. Chief Revenue Officer Paul Feenan reported that 1,034 restricted share units converted into 1,034 ordinary shares on October 5, 2026, on a one-for-one basis. He also sold 533 ordinary shares at $23.7847 per share that day. No Rule 10b5-1 plan is reported.
Arqit Quantum Inc. director d'Ovidio Manfredi Lefebvre reported converting 1,359 restricted share units into 1,359 ordinary shares on October 5, 2026. The RSUs convert one-for-one. Linked notes describe quarterly vesting schedules running from October 1, 2026, through October 1, 2028.
Arqit Quantum Inc. General Manager-US Nicholas William Nilan reported converting 959 restricted share units into 959 ordinary shares on October 5, 2026, and selling 522 ordinary shares at 23.7847 per share that day. No Rule 10b5-1 plan is reported for the sale.
Nilan reported 5,752 RSUs following the conversion. Each RSU represents a contingent right to receive one ordinary share.
Arqit Quantum Inc. (ARQQ) director Garth Ritchie converted 248 restricted share units into ordinary shares on October 5, 2026; the RSUs convert one-for-one. The corresponding ordinary-share records report 248 shares acquired. Ritchie also sold 127 ordinary shares at $23.7847 per share that day. No Rule 10b5-1 plan is reported.
Arqit Quantum Inc. Chief Operating Officer Ben Simon Wilder reported converting 277 and 166 restricted share units into the same numbers of ordinary shares, and selling 233 ordinary shares, on October 5, 2026. The sale price was $23.7847 per share; no Rule 10b5-1 plan is reported. The RSUs vest quarterly in equal installments, with the two schedules extending through October 2027 and October 2028.
Arqit Quantum Inc. General Counsel Patrick Willcocks converted 1,148 restricted share units into 1,148 ordinary shares on October 5, 2026, and sold 588 ordinary shares at $23.7847 per share that day. The units convert one-for-one into ordinary shares; the cited vesting schedules specify equal quarterly installments, with the longest schedule extending through October 1, 2028. No Rule 10b5-1 plan is reported.
Arqit Quantum Inc. General Counsel Patrick Willcocks converted 1,148 restricted share units into 1,148 ordinary shares on October 2, 2026, on a one-for-one basis. He also sold 557 ordinary shares that day at $24.4743 per share. The reported ordinary-share acquisitions were at $0.0000 per share. The 694-, 149-, and 305-unit awards have quarterly vesting schedules ending October 1, 2027, July 1, 2027, and October 1, 2028, respectively.
Arqit Quantum Inc. Chief Operating Officer Ben Simon Wilder reported converting 278 and 167 restricted share units into the same number of ordinary shares on October 2, 2026; the units convert one-for-one. He also sold 92 and 129 ordinary shares that day at $24.4743 per share, totaling 221 shares across the two sale transactions. No Rule 10b5-1 plan is reported for the sales.
Arqit Quantum Inc. director Garth Ritchie converted 250 restricted share units into ordinary shares on October 2, 2026; the units convert one-for-one and vest quarterly in equal installments. On the same date, he sold 121 ordinary shares at $24.4743 per share. No Rule 10b5-1 plan is reported.
Arqit Quantum Inc. General Manager-US Nicholas William Nilan converted 960 restricted share units into 960 ordinary shares on October 2, 2026, on a one-for-one basis. He sold 494 ordinary shares at $24.4743 per share that day; no Rule 10b5-1 plan is reported. The derivative transaction row reports 6,711 restricted share units following the transaction.
Arqit Quantum Inc. Chief Executive Officer Andrew Leaver converted 5,208 restricted share units into 5,208 ordinary shares on October 2, 2026, on a one-for-one basis. He also sold 2,818 ordinary shares at 24.4743 per share that day. His reported post-transaction balance was 192,708 RSUs, which vest in quarterly installments through October 1, 2029. No Rule 10b5-1 plan is reported.
Arqit Quantum Inc. Chief Revenue Officer Paul Feenan reported that on October 2, 2026, 1,034 restricted share units converted into ordinary shares on a one-for-one basis, and he sold 506 ordinary shares at 24.4743 per share. No Rule 10b5-1 plan is reported.
Arqit Quantum Inc. director d'Ovidio Manfredi Lefebvre converted 1,361 restricted share units into 1,361 ordinary shares on October 2, 2026; the ordinary shares were reported at $0.0000 per share. The RSUs convert into ordinary shares on a one-for-one basis. Their quarterly equal-installment vesting schedules include dates through July 1, 2027, October 1, 2027, and October 1, 2028.
Arqit Quantum Inc. director Carlo Calabria reported the conversion of 250 restricted share units into 250 ordinary shares on October 2, 2026. The RSUs convert one-for-one, and the ordinary-share entries report a price of $0.00 per share. The RSUs vest in equal quarterly installments, with the schedules attached to the reported amounts running from October 1, 2026, through October 1, 2028.
Arqit Quantum Inc. director Carlo Calabria reported the vesting and conversion of 252 RSUs into 252 ordinary shares on October 1, 2026. The RSUs convert one-for-one, and the ordinary-share entries report a price of 0.0000 per share. The four awards vest in equal quarterly installments, with schedules extending through dates as late as October 1, 2028.
Arqit Quantum Inc. Chief Revenue Officer Paul Feenan reported converting 1,036 restricted share units into 1,036 ordinary shares on October 1, 2026. The RSUs convert one-for-one. The three award groups have quarterly vesting schedules: two extend through 2027, while one extends through October 2028.
Arqit Quantum Inc. Chief Executive Officer Andrew Leaver converted 5,209 restricted share units (RSUs) into 5,209 ordinary shares on October 1, 2026, under the one-for-one conversion terms. Afterward, his direct holdings were 56,692 ordinary shares and 197,916 RSUs. The RSUs vest in equal quarterly installments on dates running from July 1, 2026, through October 1, 2029.
Arqit Quantum Inc. (ARQQ) director d'Ovidio Manfredi Lefebvre reported conversion of 1,364 restricted share units into ordinary shares on October 1, 2026; the units convert on a one-for-one basis. The five RSU and ordinary-share entries were 1,112, 17, 67, 84 and 84 shares, and the ordinary-share entries report $0.00 per share. Separately, he reported 4,396,891 ordinary shares held indirectly through Heritage Assets SCSP. The RSUs have quarterly vesting schedules extending through October 1, 2028.
Arqit Quantum Inc. General Manager-US Nicholas William Nilan converted 960 Restricted Share Units into 960 ordinary shares on October 1, 2026. His reported direct holdings afterward were 7,671 RSUs and 960 ordinary shares. The RSUs convert into ordinary shares on a one-for-one basis.
Garth Ritchie, a director of Arqit Quantum Inc. (ARQQ), reported four conversions of restricted share units totaling 252 RSUs into 252 ordinary shares on October 1, 2026. The ordinary-share acquisitions were reported at $0.00 per share; RSUs convert on a one-for-one basis. The awards have quarterly vesting schedules with final installments ranging from July 1, 2027, to October 1, 2028. No Rule 10b5-1 plan is reported.
Arqit Quantum Inc. Chief Operating Officer Ben Simon Wilder reported that 445 restricted share units vested on October 1, 2026, converting one-for-one into 445 ordinary shares. The 278 RSUs vest in equal quarterly installments on October 1, 2026, and January 1, April 1, July 1 and October 1, 2027; the 167 RSUs follow quarterly installments through October 1, 2028.
Arqit Quantum Inc. General Counsel Patrick Willcocks reported that 695, 150 and 306 Restricted Share Units vested on October 1, 2026, converting one-for-one into the same respective numbers of ordinary shares. The ordinary-share entries report $0.00 per share. The tranches have quarterly vesting schedules running through July 1, 2027, October 1, 2027, and October 1, 2028, respectively.
Arqit Quantum Inc. (ARQQ) director Lefebvre d'Ovidio Manfredi reported that Heritage Assets SCSp exercised 4,600,000 Ordinary Share Purchase Warrants on September 22, 2026, acquiring 4,600,000 ordinary shares at $2.50 per share. Each warrant entitled its holder to purchase one ordinary share and had an expiration date of September 30, 2026. After the transaction, 8,942,448 ordinary shares were beneficially owned indirectly through Heritage Assets SCSp, and the director held 49,023 ordinary shares directly. No Rule 10b5-1 plan is reported.
Arqit Quantum Inc. director Carlo Calabria exercised 757 restricted share units on July 17, 2026, converting them on a one-for-one basis into 757 ordinary shares at $0.00 per share. The RSUs vested within the week of the grant date. Following the transaction, he directly owns 232,478 ordinary shares. Because Arqit Quantum is a foreign private issuer, these transactions are exempt from Sections 16(b) and 16(c) of the Exchange Act and were not made under a Rule 10b5-1 trading plan.
Arqit Quantum Inc. director Lefebvre d'Ovidio Manfredi exercised 673 restricted share units on July 17, 2026, receiving 673 ordinary shares at $0.0000 per share. This increased direct holdings to 49,023 ordinary shares, while a further 4,396,891 ordinary shares are reported as indirectly beneficially owned through Heritage Assets SCSP. The RSUs converted one-for-one into ordinary shares and vested within the week of grant. The company is treated as a foreign private issuer, so these transactions are exempt from Sections 16(b) and 16(c) of the Exchange Act, and the Rule 10b5-1 trading plan checkbox was not marked.
Arqit Quantum director Ritchie Garth converted 841 Restricted Share Units into 841 Ordinary Shares on July 17, 2026, at a stated price of 0.0000 per share, with the RSUs converting one-for-one and vesting within the week of grant. After this derivative exercise, he directly holds 105,450 Ordinary Shares. The company notes its status as a foreign private issuer, with these transactions exempt from Sections 16(b) and 16(c) of the Exchange Act.
Arqit Quantum Inc. reported that director Carlo Calabria received a grant of 757 Restricted Share Units (RSUs) on 2026-07-15 at a price of $0.0000 per unit. These RSUs convert into 757 ordinary shares on a one-for-one basis and vest within the week of the grant date. Following this award, Calabria holds 757 RSUs directly. As a foreign private issuer, Arqit Quantum states that these transactions are exempt from Sections 16(b) and 16(c) of the Securities Exchange Act.
Arqit Quantum Inc. reported that director Garth Ritchie received a grant of 841 Restricted Share Units on July 15, 2026. Each RSU converts into one ordinary share and vests within the week of the grant date. Following this award, he holds 841 RSUs directly.
Arqit Quantum Inc. reported that director Lefebvre d'Ovidio Manfredi received a grant of 673 Restricted Share Units on July 15, 2026. These RSUs convert into 673 ordinary shares on a one-for-one basis and vest within the week of the grant. Following the award, the director beneficially owns 673 RSUs directly. As Arqit Quantum is a foreign private issuer, these transactions are exempt from Sections 16(b) and 16(c) of the Exchange Act.
Arqit Quantum Inc. director Lefebvre d'Ovidio Manfredi, through Heritage Assets SCSp, reported open-market sales of 412 Business Combination Warrants on July 9–10, 2026 at a weighted average price of $1.19 per warrant. Following these transactions, the reporting person beneficially owns 352,421 Business Combination Warrants, equivalent to 14,096.84 ordinary shares if fully exercised. Each warrant has a $11.50 exercise price and, post reverse stock split, is exercisable for 0.04 ordinary share, requiring 25 warrants to obtain one whole share.
Arqit Quantum Inc. director Lefebvre d'Ovidio Manfredi reported that an associated entity, Heritage Assets SCSp, sold Business Combination Warrants linked to ARQQ ordinary shares. The entity sold 40 warrants on July 7, 2026 at a weighted average price of $1.17 and 110 warrants on July 8, 2026 at a weighted average price of $1.40 in open-market transactions.
Each Business Combination Warrant has an exercise price of $11.50 and, after a prior 1-for-25 reverse stock split, represents the right to purchase 0.04 ARQQ ordinary share, requiring 25 warrants to receive one whole share at an aggregate exercise price of $287.50 per share. Heritage Assets SCSp beneficially owns 362,721 warrants, equivalent to 14,508.84 ARQQ ordinary shares if fully exercised, so the 150 warrants sold represent a small portion of the reported warrant position.
Arqit Quantum Inc. director Lefebvre d'Ovidio Manfredi, through Heritage Assets SCSp, reported open-market sales of 133 Business Combination Warrants linked to ARQQ ordinary shares. The sales occurred on two dates at weighted average prices within disclosed ranges, and the reporting person continues to beneficially own a large remaining warrant position equivalent to 14,658.52 ordinary shares on a post-reverse-split basis.
Arqit Quantum Inc. director Lefebvre d'Ovidio Manfredi reported routine equity compensation activity involving Restricted Share Units (RSUs). On July 1, 2026, RSUs were exercised or converted into a total of 4,133 ordinary shares at a stated price of $0.00 per share, with no open‑market purchases or sales.
The filing also shows an indirect holding of 4,342,448 ordinary shares beneficially owned through Heritage Assets SCSP, alongside a smaller direct position in ordinary shares. Footnotes confirm RSUs convert into ordinary shares on a one‑for‑one basis and vest in scheduled quarterly installments through 2028.
Arqit Quantum Inc. director Carlo Calabria reported the vesting and exercise of restricted share units into ordinary shares. On July 1, 2026, multiple RSU awards converted into a total of 799 ordinary shares at an exercise price of 0.0000 per share, classified as derivative exercises rather than open‑market purchases.
Following these transactions, Calabria directly owned 230,972 ordinary shares. Footnotes state that the RSUs convert into ordinary shares on a one‑for‑one basis and vest in equal quarterly installments on dates running through 2028, indicating a scheduled compensation program rather than discretionary trading.
Arqit Quantum Inc. General Counsel Patrick Willcocks reported a combination of option exercises and share sales. On July 1, 2026, he exercised derivative awards, acquiring 3,555 Ordinary Shares at a price of $0.00 per share through multiple transactions.
These derivative transactions included the conversion of Restricted Share Units, which convert into ARQQ ordinary shares on a one-for-one basis, with certain RSUs vesting on July 1, 2026. On July 2, 2026, he completed an open-market sale of 2,009 Ordinary Shares at an average price of $25.2026 per share, and held 9,462 Ordinary Shares directly after this sale.